WO1993006682A1 - Battery saver for wireless telephone - Google Patents

Battery saver for wireless telephone Download PDF

Info

Publication number
WO1993006682A1
WO1993006682A1 PCT/US1992/006143 US9206143W WO9306682A1 WO 1993006682 A1 WO1993006682 A1 WO 1993006682A1 US 9206143 W US9206143 W US 9206143W WO 9306682 A1 WO9306682 A1 WO 9306682A1
Authority
WO
WIPO (PCT)
Prior art keywords
power
mode
enabled
receiving means
normal mode
Prior art date
Application number
PCT/US1992/006143
Other languages
French (fr)
Inventor
Richard L. Hammon
Joseph F. Simanis
Original Assignee
Motorola, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Motorola, Inc. filed Critical Motorola, Inc.
Publication of WO1993006682A1 publication Critical patent/WO1993006682A1/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0261—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level
    • H04W52/0267—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level by controlling user interface components
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/005—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting using a power saving mode
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates generally to the field of communications and particularly to wireless telephones.
  • Cordless or wireless telephones are typically home units that consist of a base unit and one or more remote units.
  • An example of such a cordless telephone is seen in U.S. Patent No. 4,989,230 to Gillig et al., assigned to Motorola, Inc., and is incorporated herein by reference.
  • the remote units communicate with the base unit over radio frequencies (RF) typically within a range of 1000 feet of the base unit.
  • RF radio frequencies
  • the base unit is connected to the land-line telephone system, thus al ⁇ lowing a remote user to communicate with other land-line telephones.
  • the remote unit in order to conserve power, leaves the receiver in a power off state, applying power periodically for a brief period.
  • the receiver is powered up in order to check for a depressed key on the keypad or an incoming ring signal from the base unit, since the remote unit has the alert transducer to announce an incoming call.
  • the receiver draws a large amount of power from the remote's bat ⁇ tery, thus reducing the amount of time the remote can be used for a telephone call. There is a resulting need for way to re ⁇ cute the power used by the remote unit when not in a tele- phone call.
  • the process of the present invention conserves battery power for a wireless communication device.
  • the device has receiving means, data entry means, and a battery saver switch for enabling a power conservation mode or a normal mode.
  • the process consists of first determining which mode the battery saver switch is enabling. If the normal mode is enabled, power is periodically applied to the receiving means and the data entry means is scanned for a depressed key. If the power conservation mode is enabled, the data entry means is scanned periodically for a depressed key while the receiving means remains in an unpowered state.
  • FIG. 1 shows a block diagram of a base unit of a cord ⁇ less telephone.
  • FIG. 2 shows a block diagram of a remote unit of a cord- less telephone.
  • FIG. 3 shows a flowchart of the process for enabling a scrambling demonstration mode.
  • FIG. 4 shows a block diagram of a scrambler integrated circuit.
  • FIG. 5 shows a flowchart of the power saving process of the present invention.
  • FIG. 6 shows a block diagram of a battery saver circuit of the present invention.
  • the process of the present invention reduces the time that power is being used by the remote unit's receiver. By placing a switch in the power conservation mode position, the receiver is not turned on periodically as in the normal mode, thus reducing power consumption.
  • FIG. 1 illustrates a preferred em ⁇ bodiment of a cordless telephone base unit having a control ⁇ lable scrambling or encryption circuit for encrypting and de- crypting signals.
  • This particular base unit also includes a speakerphone.
  • FIG. 2 illustrates a preferred embodiment of a remote unit for communicating with the base unit, the remote also having a controllable scrambling or encryption circuit for encrypting and decrypting signals.
  • the base unit is comprised of an an- tenna (101) that is coupled to the receive and transmit paths of the base.
  • the receive path is comprised of a bandpass filter (102) that allows the frequencies of 49.670 - 49.990 MHz to pass.
  • the filter is connected to a receive amplifier (103) that ampli ⁇ fies the filtered signal by approximately 18 dB.
  • the output of the amplifier is then filtered by another bandpass filter (104) before being input to the receiver (105).
  • the preferred em ⁇ bodiment/the receiver is an MC3363 available from Motorola, Inc.
  • the receiver (105) mixes the signal down to 10.7 MHz and then to 455 kHz. This signal is then demodulated.
  • the lo ⁇ cal oscillators in the receiver (105) are controlled by a phase locked loop (120) whose frequency is controlled by a micropro ⁇ cessor (112).
  • the microprocessor (112) also receives a carrier detect signal and the demodulated signal, labeled RX Data, from the receiver (105).
  • the demodulated signal is used by the microprocessor (112) to interpret coded data messages trans ⁇ mitted by the remote unit. These coded data messages are used for DTMF dialing, telephone hook switch control, and control of the scrambling circuit.
  • the carrier detect signal is used to detect the presence of a transmitter occupying the base unit receive channel.
  • the mi ⁇ croprocessor (112) is an MC68HCL05C4 available from Motorola, Inc.
  • the output of the receiver (105) is filtered again by an- other bandpass filter (106).
  • the output of the filter (106) is in ⁇ put to the scrambling circuit (107).
  • the scrambling circuit (107) is an MX108DW Full- Duplex Voiceband Scrambler integrated circuit available from MX • Com, Inc.
  • the unscrambled output of the scrambler circuit (107) is filtered in a de-emphasis filter (108) before being input to an expander (109).
  • the expansion process applies gain to the in ⁇ put signal that is varied as a function of the signal magnitude. The effective gain being greater for large magnitude signals and less for small magnitude signals.
  • this signal After this signal has been filtered by a highpass filter (110), it is input to a speaker- phone circuit (111) and is also output to the land-line telephone system. If the speakerphone is being used, such as in a three way call between the base, the remote, and a land-line party, the audio signal is output to the base unit's speaker.
  • the transmit path of the -base is comprised of the audio signal, either from the microphone (121) of the speakerphone or the land-line party, being bandpass filtered (113) before go ⁇ ing through a compressor (114).
  • the compressor (114) applies gain to the audio signal that is varied as a function of the sig- nal magnitude, the effective gain being greater for small sig ⁇ nals.
  • An example of a compandor compressor/expander
  • the dynamic range of the compandor is 80 dB.
  • the output of the compressor (114) is input to a pre-em- phasis filter (115) before being scrambled by the scrambler cir ⁇ cuit (116).
  • the scrambler circuit (116) is the second half of the same integrated circuit used to unscramble the received sig ⁇ nal.
  • the scrambled audio signal is bandpass filtered (117) be ⁇ fore being modulated by the transmitter (118) to a frequency in the range of 46.610 - 46.970 MHz.
  • the actual frequency used by the telephone can. be user selectable by a switch or other con ⁇ trol on the telephone base or remote. Both the receive and transmit frequency ranges are set by the FCC for all cordless telephones.
  • An example of a transmitter is MC2833 manufac- tured by Motorola, Inc.
  • the output of the transmitter is bandpass filtered (119) to filter out the signal outside the 46.610 - 46.970 MHz range.
  • This signal is then transmitted from the antenna (101) to the remote unit.
  • the remote unit is comprised of the antenna (201) that receives the signal from the base unit.
  • a bandpass filter (202) removes that part of the signal outside the range of 46.610 - 46.970 MHz.
  • a gain of approximately 18 dB is then applied to the signal by a receive amplifier (203) before it is bandpass fil ⁇ tered (204) again. This signal is then input to the receiver (205).
  • the remote unit receiver (205) mixes the signal down to 10.7 MHz and then to 455 kHz. This signal is then demodu ⁇ lated.
  • the demodulated signal labeled RX Data, is input to the microprocessor (212) to interpret the coded data messages transmitted by the base unit. These coded data messages are used to control the remote ringer and the scrambling circuit.
  • the demodulated signal is also bandpass filtered (206) before being input to the scrambler circuit (207) for descram- bling.
  • the scrambler circuit (207) is identical to the integrated circuit used in the base unit.
  • the unscrambled output is filtered by a de-emphasis fil ⁇ ter (208) before going through an expander (209).
  • the ex ⁇ panded signal is bandpass filtered (210) and amplified (211).
  • the amplifier (211) is controlled by the microprocessor (212). By operating a control on the remote unit, the user can in ⁇ crease or decrease the speaker (220) volume by increasing or decreasing the gain applied to the signal at this point.
  • the amplified signal is input to the earpiece speaker of the remote unit.
  • the microphone (221) of the remote generates the audio signal that is bandpass filtered (213), compressed (214), and filtered by a pre-emphasis filter (215) before being processed by the scrambler circuit (216).
  • This circuit (216) is the second half of the integrated circuit used to unscramble the received signal.
  • the scrambled signal is bandpass filtered (217) before being modulated to a frequency in the range of 49.67 - 49.99 MHz by the transmitter (218).
  • the modulated signal is band ⁇ pass filtered (219) to remove the signal outside this frequency range and is transmitted on the remote's antenna (201).
  • the keypad on the remote (222) is used to take the tele ⁇ phone off hook, enter telephone numbers, change the fre ⁇ quency used to communicate with the base, and to enable the scramble demonstration function.
  • the keypad enables the scrambling demonstration function by telling the micropro ⁇ cessor to generate a control signal to the scrambling inte ⁇ grated circuit.
  • the base unit also has a keypad.
  • control signals in both the remote and the base units are connected to the transmitter after the scrambling function so that these signals are not scrambled.
  • the control signals, generated by the microprocessor, are wire-ORed with the scrambled voice signal to the transmitter input.
  • the scrambling of the signal between the remote and the base is operating continuously. This scrambling, how ⁇ ever, is not evident to the telephone user or the party on the other end of the call. It would not be known, therefore, if the scrambling was operating properly.
  • the scrambling demon ⁇ stration process of the present invention provides both parties to the telephone call the ability to hear the scrambled version of the signal.
  • the scrambling demonstration process is illustrated in FIG. 3. While the telephone is in a call, the keypad is scanned (301) by the microprocessor for the depression of a key, such as a Secure Demo key, that indicates that the remote unit user wishes to enter the scrambling demonstration mode. In the preferred embodiment, this mode is referred to as the Secure Demo mode.
  • a key such as a Secure Demo key
  • a timer in the microproces- sor is started (303). If the key is released immediately (304), the timer is cleared (305) and the keypad scanned again (301). If the key is still depressed (304), the timer is incremented (306) and checked to determine if the key has been depressed for at least 3 seconds (307). This time check is continued until the key has been depressed for 3 seconds. At this point, the scrambling demonstration mode is operating (308). This can be indicated on the remote or the base by flashing indicator lights (309). The remote keypad may be used for the above pro ⁇ cess or, if the base has a keypad, this keypad may be used to enter the scrambling demonstration mode. 5 The block diagram of the MX108DW Full-Duplex
  • Voiceband Scrambler integrated circuit is illustrated in FIG. 4. Since this integrated circuit uses frequency inversion scrambling, a signal that is input to the circuit that has al ⁇ ready been scrambled will be returned to normal by the ⁇ r-
  • the MX108DW In order to put the telephone into the scrambling demonstration mode, the MX108DW must be able to transmit the input signal without scrambling. This is accomplished by the control input labeled Qear/Scramble. By applying a logic one
  • the microprocessor begins with the microprocessor in a stop or sleep mode (501).
  • the microprocessor then receives an in ⁇ terrupt (502) by an external clock. This interrupt is done peri ⁇ odically to enable the microprocessor to check for inputs from the base unit or the keypad on the remote unit.
  • the microprocessor then checks the battery saver switch to determine the mode of the telephone (503). If the switch is in the normal operation mode, power is applied to the receiver and the received signals are monitored for data from the base unit (504). If the battery saver switch is in the
  • ⁇ 35 power conservation mode position power is not applied to the receiver.
  • the keypad is scanned to determine if a key has been depressed (505). If a key was depressed (506), the key is pro ⁇ Completed (507). An example of such a key is a last number redial key or number key for dialing a telephone number. If a key was not depressed (506), it is determined if power was applied to the receiver (508). If the receiver is on, it is determined if data was received (509). If data was received, the data is processed (510).
  • An example of the type of data re ⁇ ceived is a ring signal from the base unit instructing the re- mote unit to activate the alert tone.
  • a software timer is next checked to determine if the mi ⁇ croprocessor has been active for the required time (511).
  • the microprocessor is awake for 40 ms in the power conservation mode and 125 ms in the normal mode. The shortened time for the power conservation mode reduces the power load on the remote's battery.
  • the process repeats from scanning the keypad (505). If the time has elapsed (511), the power to the receiver is removed (512), if it had been ap- plied initially.
  • the battery saver circuit of the present invention is il ⁇ lustrated in FIG. 6. This circuit is comprised of a switch (601) to the microprocessor (602) input. When the switch (601) is closed, a logic one is input to the microprocessor (602), thus indicating the telephone is in the power conservation mode. The interrupt to bring the microprocessor (602) out of the sleep mode comes from either the keypad (603) or the sleep timer (604).
  • a transistor switch (605) is coupled to the microproces ⁇ sor to allow tiie microprocessor (602) to turn the transistor (605) on and apply power to the receiver.
  • the recovered data received from the base unit is input from the receiver to the microprocessor.
  • the cordless telephone while in the power conservation mode, can still make or receive calls by pressing a key on the keypad or, in the preferred embodiment, opening the flip of the remote unit.
  • the remote automati ⁇ cally returns to the power conservation mode, if that was the mode selected before the call.
  • the user can use the remote to enter telephone numbers to be stored in the base unit's memory for memory dialling later. These numbers can be entered while the remote is in the power conservation mode.
  • the microprocessor automatically turns on the transmitter and sends the numbers to the base unit for storage. After a certain time, the transmitter turns off and the remote automatically reverts to the power conservation mode if that was the mode previously selected.
  • a wireless or cordless telephone having controllable scrambling between the remote unit and the base unit has been shown, thus providing secure conversations be ⁇ tween the telephone user and the land-line party.
  • the tele ⁇ phone also has a mode for normal power consumption and a power conservation mode. By placing the telephone in the power conservation mode, the telephone can be used for longer periods between battery charging.

Abstract

The process of the present invention conserves battery power for a cordless telephone, comprising a base unit and a remote unit. The remote unit has a receiver (205), keypad (222) and a battery saver switch (601) for enabling a power conservation mode or a normal mode. The process consists of first determining which mode the battery saver switch (601) is enabling. If the normal mode is enabled, power is periodically applied to the receiver (205) and the keypad (222) is scanned for a depressed key. If the power conservation mode is enabled, the keypad (222) is scanned periodically for a depressed key while the receiver (205) remains in an unpowered state.

Description

BATTERY SAVER FOR WIRELESS TELEPHONE
Field of the Invention
The present invention relates generally to the field of communications and particularly to wireless telephones.
Background of the Invention
Cordless or wireless telephones are typically home units that consist of a base unit and one or more remote units. An example of such a cordless telephone is seen in U.S. Patent No. 4,989,230 to Gillig et al., assigned to Motorola, Inc., and is incorporated herein by reference. The remote units communicate with the base unit over radio frequencies (RF) typically within a range of 1000 feet of the base unit. The base unit is connected to the land-line telephone system, thus al¬ lowing a remote user to communicate with other land-line telephones. The remote unit, in order to conserve power, leaves the receiver in a power off state, applying power periodically for a brief period. The receiver is powered up in order to check for a depressed key on the keypad or an incoming ring signal from the base unit, since the remote unit has the alert transducer to announce an incoming call. When the receiver is powered up, it draws a large amount of power from the remote's bat¬ tery, thus reducing the amount of time the remote can be used for a telephone call. There is a resulting need for way to re¬ duce the power used by the remote unit when not in a tele- phone call.
Summary of the Invention
The process of the present invention conserves battery power for a wireless communication device. The device has receiving means, data entry means, and a battery saver switch for enabling a power conservation mode or a normal mode. The process consists of first determining which mode the battery saver switch is enabling. If the normal mode is enabled, power is periodically applied to the receiving means and the data entry means is scanned for a depressed key. If the power conservation mode is enabled, the data entry means is scanned periodically for a depressed key while the receiving means remains in an unpowered state.
Brie -Description of the Drawings
FIG. 1 shows a block diagram of a base unit of a cord¬ less telephone.
FIG. 2 shows a block diagram of a remote unit of a cord- less telephone.
FIG. 3 shows a flowchart of the process for enabling a scrambling demonstration mode.
FIG. 4 shows a block diagram of a scrambler integrated circuit. FIG. 5 shows a flowchart of the power saving process of the present invention.
FIG. 6 shows a block diagram of a battery saver circuit of the present invention.
DetafledDescrφtionof the Pi fiE -d Embodiment
The process of the present invention reduces the time that power is being used by the remote unit's receiver. By placing a switch in the power conservation mode position, the receiver is not turned on periodically as in the normal mode, thus reducing power consumption.
The block diagram of FIG. 1 illustrates a preferred em¬ bodiment of a cordless telephone base unit having a control¬ lable scrambling or encryption circuit for encrypting and de- crypting signals. This particular base unit also includes a speakerphone. FIG. 2 illustrates a preferred embodiment of a remote unit for communicating with the base unit, the remote also having a controllable scrambling or encryption circuit for encrypting and decrypting signals.
Referring to FIG. 1, the base unit is comprised of an an- tenna (101) that is coupled to the receive and transmit paths of the base. The receive path is comprised of a bandpass filter (102) that allows the frequencies of 49.670 - 49.990 MHz to pass. The filter is connected to a receive amplifier (103) that ampli¬ fies the filtered signal by approximately 18 dB. The output of the amplifier is then filtered by another bandpass filter (104) before being input to the receiver (105). In the preferred em¬ bodiment/the receiver is an MC3363 available from Motorola, Inc.
The receiver (105) mixes the signal down to 10.7 MHz and then to 455 kHz. This signal is then demodulated. The lo¬ cal oscillators in the receiver (105) are controlled by a phase locked loop (120) whose frequency is controlled by a micropro¬ cessor (112). The microprocessor (112) also receives a carrier detect signal and the demodulated signal, labeled RX Data, from the receiver (105). The demodulated signal is used by the microprocessor (112) to interpret coded data messages trans¬ mitted by the remote unit. These coded data messages are used for DTMF dialing, telephone hook switch control, and control of the scrambling circuit. The carrier detect signal is used to detect the presence of a transmitter occupying the base unit receive channel. In the preferred embodiment, the mi¬ croprocessor (112) is an MC68HCL05C4 available from Motorola, Inc.
The output of the receiver (105) is filtered again by an- other bandpass filter (106). The output of the filter (106) is in¬ put to the scrambling circuit (107). In the preferred embodi¬ ment, the scrambling circuit (107) is an MX108DW Full- Duplex Voiceband Scrambler integrated circuit available from MX • Com, Inc. The unscrambled output of the scrambler circuit (107) is filtered in a de-emphasis filter (108) before being input to an expander (109). The expansion process applies gain to the in¬ put signal that is varied as a function of the signal magnitude. The effective gain being greater for large magnitude signals and less for small magnitude signals. After this signal has been filtered by a highpass filter (110), it is input to a speaker- phone circuit (111) and is also output to the land-line telephone system. If the speakerphone is being used, such as in a three way call between the base, the remote, and a land-line party, the audio signal is output to the base unit's speaker. The transmit path of the -base is comprised of the audio signal, either from the microphone (121) of the speakerphone or the land-line party, being bandpass filtered (113) before go¬ ing through a compressor (114). The compressor (114) applies gain to the audio signal that is varied as a function of the sig- nal magnitude, the effective gain being greater for small sig¬ nals. An example of a compandor (compressor/expander) is MC33110 manufactured by Motorola, Inc. The dynamic range of the compandor is 80 dB.
The output of the compressor (114) is input to a pre-em- phasis filter (115) before being scrambled by the scrambler cir¬ cuit (116). The scrambler circuit (116) is the second half of the same integrated circuit used to unscramble the received sig¬ nal. The scrambled audio signal is bandpass filtered (117) be¬ fore being modulated by the transmitter (118) to a frequency in the range of 46.610 - 46.970 MHz. The actual frequency used by the telephone can. be user selectable by a switch or other con¬ trol on the telephone base or remote. Both the receive and transmit frequency ranges are set by the FCC for all cordless telephones. An example of a transmitter is MC2833 manufac- tured by Motorola, Inc.
The output of the transmitter is bandpass filtered (119) to filter out the signal outside the 46.610 - 46.970 MHz range. This signal is then transmitted from the antenna (101) to the remote unit. The remote unit is comprised of the antenna (201) that receives the signal from the base unit. A bandpass filter (202) removes that part of the signal outside the range of 46.610 - 46.970 MHz. A gain of approximately 18 dB is then applied to the signal by a receive amplifier (203) before it is bandpass fil¬ tered (204) again. This signal is then input to the receiver (205).
The remote unit receiver (205) mixes the signal down to 10.7 MHz and then to 455 kHz. This signal is then demodu¬ lated. The demodulated signal, labeled RX Data, is input to the microprocessor (212) to interpret the coded data messages transmitted by the base unit. These coded data messages are used to control the remote ringer and the scrambling circuit. The demodulated signal is also bandpass filtered (206) before being input to the scrambler circuit (207) for descram- bling. The scrambler circuit (207) is identical to the integrated circuit used in the base unit.
The unscrambled output is filtered by a de-emphasis fil¬ ter (208) before going through an expander (209). The ex¬ panded signal is bandpass filtered (210) and amplified (211). The amplifier (211) is controlled by the microprocessor (212). By operating a control on the remote unit, the user can in¬ crease or decrease the speaker (220) volume by increasing or decreasing the gain applied to the signal at this point. The amplified signal is input to the earpiece speaker of the remote unit. The microphone (221) of the remote generates the audio signal that is bandpass filtered (213), compressed (214), and filtered by a pre-emphasis filter (215) before being processed by the scrambler circuit (216). This circuit (216) is the second half of the integrated circuit used to unscramble the received signal.
The scrambled signal is bandpass filtered (217) before being modulated to a frequency in the range of 49.67 - 49.99 MHz by the transmitter (218). The modulated signal is band¬ pass filtered (219) to remove the signal outside this frequency range and is transmitted on the remote's antenna (201). The keypad on the remote (222) is used to take the tele¬ phone off hook, enter telephone numbers, change the fre¬ quency used to communicate with the base, and to enable the scramble demonstration function. The keypad enables the scrambling demonstration function by telling the micropro¬ cessor to generate a control signal to the scrambling inte¬ grated circuit. In the preferred embodiment, the base unit also has a keypad.
The control signals in both the remote and the base units are connected to the transmitter after the scrambling function so that these signals are not scrambled. The control signals, generated by the microprocessor, are wire-ORed with the scrambled voice signal to the transmitter input.
The scrambling of the signal between the remote and the base is operating continuously. This scrambling, how¬ ever, is not evident to the telephone user or the party on the other end of the call. It would not be known, therefore, if the scrambling was operating properly. The scrambling demon¬ stration process of the present invention provides both parties to the telephone call the ability to hear the scrambled version of the signal.
The scrambling demonstration process is illustrated in FIG. 3. While the telephone is in a call, the keypad is scanned (301) by the microprocessor for the depression of a key, such as a Secure Demo key, that indicates that the remote unit user wishes to enter the scrambling demonstration mode. In the preferred embodiment, this mode is referred to as the Secure Demo mode.
If the key is depressed (302), a timer in the microproces- sor is started (303). If the key is released immediately (304), the timer is cleared (305) and the keypad scanned again (301). If the key is still depressed (304), the timer is incremented (306) and checked to determine if the key has been depressed for at least 3 seconds (307). This time check is continued until the key has been depressed for 3 seconds. At this point, the scrambling demonstration mode is operating (308). This can be indicated on the remote or the base by flashing indicator lights (309). The remote keypad may be used for the above pro¬ cess or, if the base has a keypad, this keypad may be used to enter the scrambling demonstration mode. 5 The block diagram of the MX108DW Full-Duplex
Voiceband Scrambler integrated circuit is illustrated in FIG. 4. Since this integrated circuit uses frequency inversion scrambling, a signal that is input to the circuit that has al¬ ready been scrambled will be returned to normal by the άr-
10 cuit.
In order to put the telephone into the scrambling demonstration mode, the MX108DW must be able to transmit the input signal without scrambling. This is accomplished by the control input labeled Qear/Scramble. By applying a logic one
15 to this input, the signal is transmitted through the path via the clear path. A logic zero on this control input will cause the signal to be transmitted through the path via the scramble path.
The preferred embodiment of the cordless telephone dis-
20 ables the entire scrambling integrated circuit in the remote unit when the scrambling demonstration mode is initiated. This allows the scrambled audio signal to be heard by both the telephone user and the land-line party to the conversation. The power saving process of the present invention, il-
25 lustrated in FIG. 5, begins with the microprocessor in a stop or sleep mode (501). The microprocessor then receives an in¬ terrupt (502) by an external clock. This interrupt is done peri¬ odically to enable the microprocessor to check for inputs from the base unit or the keypad on the remote unit.
30 The microprocessor then checks the battery saver switch to determine the mode of the telephone (503). If the switch is in the normal operation mode, power is applied to the receiver and the received signals are monitored for data from the base unit (504). If the battery saver switch is in the
Σ35 power conservation mode position, power is not applied to the receiver. The keypad is scanned to determine if a key has been depressed (505). If a key was depressed (506), the key is pro¬ cessed (507). An example of such a key is a last number redial key or number key for dialing a telephone number. If a key was not depressed (506), it is determined if power was applied to the receiver (508). If the receiver is on, it is determined if data was received (509). If data was received, the data is processed (510). An example of the type of data re¬ ceived is a ring signal from the base unit instructing the re- mote unit to activate the alert tone.
A software timer is next checked to determine if the mi¬ croprocessor has been active for the required time (511). In the preferred embodiment, the microprocessor is awake for 40 ms in the power conservation mode and 125 ms in the normal mode. The shortened time for the power conservation mode reduces the power load on the remote's battery.
If the time has not elapsed (511), the process repeats from scanning the keypad (505). If the time has elapsed (511), the power to the receiver is removed (512), if it had been ap- plied initially.
If the battery saver switch is in the power conservation mode (513), the time is reset to 40 ms (515). If the switch is in the normal mode, the time is reset to 125 ms (514). The micro¬ processor then returns to the sleep state for 1.2 seconds, in the preferred embodiment, after which the process starts over. The battery saver circuit of the present invention is il¬ lustrated in FIG. 6. This circuit is comprised of a switch (601) to the microprocessor (602) input. When the switch (601) is closed, a logic one is input to the microprocessor (602), thus indicating the telephone is in the power conservation mode. The interrupt to bring the microprocessor (602) out of the sleep mode comes from either the keypad (603) or the sleep timer (604). A transistor switch (605) is coupled to the microproces¬ sor to allow tiie microprocessor (602) to turn the transistor (605) on and apply power to the receiver. The recovered data received from the base unit is input from the receiver to the microprocessor.
The cordless telephone, while in the power conservation mode, can still make or receive calls by pressing a key on the keypad or, in the preferred embodiment, opening the flip of the remote unit. When the call has ended, the remote automati¬ cally returns to the power conservation mode, if that was the mode selected before the call.
Also in the preferred embodiment, the user can use the remote to enter telephone numbers to be stored in the base unit's memory for memory dialling later. These numbers can be entered while the remote is in the power conservation mode. In this case, the microprocessor automatically turns on the transmitter and sends the numbers to the base unit for storage. After a certain time, the transmitter turns off and the remote automatically reverts to the power conservation mode if that was the mode previously selected.
In summary, a wireless or cordless telephone having controllable scrambling between the remote unit and the base unit has been shown, thus providing secure conversations be¬ tween the telephone user and the land-line party. The tele¬ phone also has a mode for normal power consumption and a power conservation mode. By placing the telephone in the power conservation mode, the telephone can be used for longer periods between battery charging.

Claims

Claim8
1. A method for battery power conservation in a wireless communication device having receiving means, data entry means, and a battery saver switch for enabling a power con¬ servation mode or a normal mode, the method comprising the steps o£ deteπnining which mode the battery saver switch is en¬ abling; if the normal mode is enabled, periodically applying power to the receiving means; if the normal mode is enabled, scanning the data entry means for a depressed key when power is applied to the receiv¬ ing means; and if the power conservation mode is enabled, periodically scanning the data entry means for a depressed key while the receiving means remains in an unpowered state.
2. The method of claim 1 and further including the steps of: if the normal mode is enabled, checking for data after power has been applied to the receiving means; and removing power rom the receiving means.
3. A method for battery power conservation in a wireless communication device having receiving means, data entry means, and a battery saver switch for enabling a power con¬ servation mode or a normal mode, the method comprising the steps of: determining which mode the battery saver switch is en- abling; if the normal mode is enabled, periodically applying power to the receiving means; if the normal mode is enabled, scanning the data entry means for a depressed key when power is applied to the receiv- ing means; if the power conservation mode is enabled, periodically scanning the data entry means for a depressed key without applying power to the receiving means; if the normal mode is enabled, checking for data after power has been applied to the receiving means; and if power has been applied to the receiving means, re¬ moving power from the receiving means.
4. A method for battery power conservation in a wireless tele- phone having a base unit and a remote unit, the base unit transmitting data signals to the remote unit over a communi¬ cations medium, the remote unit having receiving means, data entry means having a plurality of keys, processing means, and a battery saver switch for enabling a normal mode or a power conservation mode, the method comprising the steps of: a) periodically interrupting the processing means; b) if the normal mode is enabled when the processing means is interrupted, applying power to the receiving means; c) if the power conservation mode is enabled when the processing means is interrupted, retaining the receiving means in a power off state; d) scanning the data entry means for a depressed key, e) if a key was depressed, processing the key, f if power was applied to the receiving means, checking for data signals transmitted by the base unit, g) repeating from step d for a first predetermined time if the normal mode is enabled or a second predetermined time if the power conservation mode is enabled; and h) if power was applied to the receiving means, remov¬ ing power from the receiving means.
5. The method of claim 4 wherein the first predetermined time is 125 milliseconds and the second predetermined time is 40 milliseconds.
6. A wireless telephone apparatus having a remote unit and a base unit coupled to a telephone system, the remote unit communicating with the base unit over a communications medium, the remote unit having a receiver, a keypad, and processing means, the apparatus comprising: power switching means, coupled to the processing means, for controlling power to the receiver; mode switching means, coupled to the processing means, for enabling either a power conservation mode or a normal mode; and the processing means controlling the power to the re¬ ceiver in response to the mode switching means and a method for power conservation, the method comprising the steps of: determining which mode the mode switching means is enabling; if the normal mode is enabled, periodically apply¬ ing power to the receiver; if the normal mode is enabled, scanning the key¬ pad for a depressed key when power is applied to the re- ceiver; and if the power conservation mode is enabled, period¬ ically scanning the keypad for a depressed key while the receiver remains in an unpowered state.
PCT/US1992/006143 1991-09-16 1992-07-24 Battery saver for wireless telephone WO1993006682A1 (en)

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US760,558 1991-09-16

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FR (1) FR2683408A1 (en)
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US9386542B2 (en) 2013-09-19 2016-07-05 Google Technology Holdings, LLC Method and apparatus for estimating transmit power of a wireless device
US9401750B2 (en) 2010-05-05 2016-07-26 Google Technology Holdings LLC Method and precoder information feedback in multi-antenna wireless communication systems
US9438293B2 (en) 2014-08-05 2016-09-06 Google Technology Holdings LLC Tunable circuit elements for dynamic, per element power
US9472965B2 (en) 2014-09-08 2016-10-18 Google Technology Holdings LLC Battery cycle life through smart overnight charging
US9478847B2 (en) 2014-06-02 2016-10-25 Google Technology Holdings LLC Antenna system and method of assembly for a wearable electronic device
US9491007B2 (en) 2014-04-28 2016-11-08 Google Technology Holdings LLC Apparatus and method for antenna matching
US9491706B2 (en) 2013-03-13 2016-11-08 Google Technology Holdings LLC Reduced-power transmitting from a communications device
US9549290B2 (en) 2013-12-19 2017-01-17 Google Technology Holdings LLC Method and apparatus for determining direction information for a wireless device
US9591508B2 (en) 2012-12-20 2017-03-07 Google Technology Holdings LLC Methods and apparatus for transmitting data between different peer-to-peer communication groups
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EP1079530A2 (en) * 1994-07-21 2001-02-28 Interdigital Technology Corporation Power consumption control method and apparatus for a communication system subscriber unit
EP1079530A3 (en) * 1994-07-21 2002-06-19 Interdigital Technology Corporation Power consumption control method and apparatus for a communication system subscriber unit
US6775531B1 (en) 1994-07-21 2004-08-10 Interdigital Technology Corporation Subscriber terminal temperature regulation
GB2314739A (en) * 1996-06-26 1998-01-07 Samsung Electronics Co Ltd Disabling key scanning operation in a mobile phone
GB2314739B (en) * 1996-06-26 1999-03-10 Samsung Electronics Co Ltd Apparatus for and method of controlling key locking operation in mobile cordless telephone
WO1998025389A2 (en) * 1996-12-05 1998-06-11 Ericsson Inc. Emergency telephone with automatic low-battery signaling
WO1998025389A3 (en) * 1996-12-05 1998-10-22 Ericsson Ge Mobile Inc Emergency telephone with automatic low-battery signaling
AU737750B2 (en) * 1996-12-05 2001-08-30 Ericsson Inc. Emergency telephone with automatic low-battery signaling
EP1662669A2 (en) * 2000-09-22 2006-05-31 Fujitsu Limited Electronic equipment having a switch for controlling a wireless communication device
EP1662669A3 (en) * 2000-09-22 2006-06-14 Fujitsu Limited Electronic equipment having a switch for controlling a wireless communication device
EP2187529A1 (en) * 2000-09-22 2010-05-19 Fujitsu Limited Electronic equipment having a switch for controlling a wireless communication device
US9401750B2 (en) 2010-05-05 2016-07-26 Google Technology Holdings LLC Method and precoder information feedback in multi-antenna wireless communication systems
WO2014039118A1 (en) * 2012-09-04 2014-03-13 Motorola Mobility Llc Method and device with enhanced battery capacity savings
US9419457B2 (en) 2012-09-04 2016-08-16 Google Technology Holdings LLC Method and device with enhanced battery capacity savings
US9356461B2 (en) 2012-09-25 2016-05-31 Google Technology Holdings, LLC Methods and systems for rapid wireless charging where the low state of charge (SOC) temperature dependent charging current and low SOC temperature limit are higher than the high SOC temperature dependent charging current and high SOC temperature limit
US10020963B2 (en) 2012-12-03 2018-07-10 Google Technology Holdings LLC Method and apparatus for selectively transmitting data using spatial diversity
US9813262B2 (en) 2012-12-03 2017-11-07 Google Technology Holdings LLC Method and apparatus for selectively transmitting data using spatial diversity
US9591508B2 (en) 2012-12-20 2017-03-07 Google Technology Holdings LLC Methods and apparatus for transmitting data between different peer-to-peer communication groups
US9979531B2 (en) 2013-01-03 2018-05-22 Google Technology Holdings LLC Method and apparatus for tuning a communication device for multi band operation
US10229697B2 (en) 2013-03-12 2019-03-12 Google Technology Holdings LLC Apparatus and method for beamforming to obtain voice and noise signals
US9491706B2 (en) 2013-03-13 2016-11-08 Google Technology Holdings LLC Reduced-power transmitting from a communications device
US9386542B2 (en) 2013-09-19 2016-07-05 Google Technology Holdings, LLC Method and apparatus for estimating transmit power of a wireless device
US9596653B2 (en) 2013-12-16 2017-03-14 Google Technology Holdings LLC Remedying power drain via a coverage map
US9949210B2 (en) 2013-12-16 2018-04-17 Google Technology Holdings LLC Remedying power drain via a coverage map
US9549290B2 (en) 2013-12-19 2017-01-17 Google Technology Holdings LLC Method and apparatus for determining direction information for a wireless device
US9491007B2 (en) 2014-04-28 2016-11-08 Google Technology Holdings LLC Apparatus and method for antenna matching
US9478847B2 (en) 2014-06-02 2016-10-25 Google Technology Holdings LLC Antenna system and method of assembly for a wearable electronic device
US9865897B2 (en) 2014-06-02 2018-01-09 Google Llc Stacked electrochemical cell with increased energy density
US9438293B2 (en) 2014-08-05 2016-09-06 Google Technology Holdings LLC Tunable circuit elements for dynamic, per element power
US9847661B2 (en) 2014-09-08 2017-12-19 Google Llc Extended battery cycle life through smart charging of rechargeable batteries
US9472965B2 (en) 2014-09-08 2016-10-18 Google Technology Holdings LLC Battery cycle life through smart overnight charging

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Publication number Publication date
ITRM920656A1 (en) 1994-03-09
TW198141B (en) 1993-01-11
CN1071292A (en) 1993-04-21
ITRM920656A0 (en) 1992-09-09
AU2417892A (en) 1993-04-27
MX9205231A (en) 1993-03-01
IT1258482B (en) 1996-02-26
FR2683408A1 (en) 1993-05-07

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