DE3611843A1 - Remote control circuit for parallel operation - Google Patents

Abstract

In a remote control circuit for the parallel operation of transmitters and receivers, it should be possible to transmit, receive and evaluate different control pulse sequences at the same time. For this purpose, each pulse of the control pulse sequence is converted in the transmitter in a transmitter-typical identification pulse group. The identification pulse groups are so short that a number of them can fall into gaps between the control signal pulses. The receiver evaluates the identification pulse groups of the received mixed pulse sequence.

Description

The invention relates to a remote control circuit for the Parallel operation of transmitters and receivers where the Transmission circuit during their activation one Control pulse sequence generated at which the pulse pause is long compared to the pulse duration, and at which the Receiving circuit the received control pulse train evaluates and the desired switching or control process triggers.

In DE-OS 29 51 976 is a remote control device described in which different light sources through different stations can be switched. On the Pressing a push button gives the respective transmitter a control signal pulse sequence, the pulse pauses so are set that the assigned light source switches. If several transmitters are provided, the same Radiate transmission pulse train, then switch the same recipient. Are multiple recipients on the same control pulse sequence coded, then with a Transmitter to switch multiple receivers. In all It is important here, however, that the transmitter only be operated one after the other, so that always only a control pulse sequence is sent, otherwise the Receiver consisting of several control pulse sequences Cannot recognize pulse mixture.

In DE-OS 29 51 974 is a remote control circuit described in the multiple functions of a receiver can be controlled. A simultaneous activation multiple functions are not possible here either. All Functions must be switched one after the other.

Remote control systems are also known in which several Functions can be controlled simultaneously. These work with carrier frequency modulation. Such facilities are correspondingly complex.

In many cases it is practical and sufficient if the transmitter has the different functions of device provided to the receiver, such as Driving toys, slide projectors or similar, only one after the other can be operated. In numerous applications however, it is desirable that various functions one or more recipients by one or more Transmitter can be controlled at the same time. For example, with a remote-controlled crane at the same time during the movement of the crane hook can be raised or lowered. Thereby the Movement as long as the corresponding one Manual switch button of the transmitter is pressed. Frequently should also several crane systems in the immediate distance at the same time, but independently of each other different transmitters can be operated.

The object of the invention is a remote control circuit to propose of the type mentioned at the beginning with which different control pulse sequences at the same time can be sent, received and evaluated.

According to the invention, the above task is for a Remote control circuit of the type mentioned by the Features of the characterizing part of claim 1 solved.

This ensures that several transmission circuits can simultaneously send control pulse sequences and the the associated receiving circuits separate different control pulse sequences. A Synchronization of the control pulse sequences of different Transmission circuits are not necessary and also not he wishes. Because it is assumed here that in practically different functions of the To activate transmission circuits exactly at the same time the labeling pulse groups are started constantly collapse. The simultaneity with which In the present case, the control pulse sequences are sent and can be received is understood to mean that the different control pulse sequences nested together with a high probability that that labeling pulse groups do not coincide. The Labeling impulse groups should not occur simultaneously. The control pulse sequences should be in the way are sent or received simultaneously can that there is no need for another Send control pulse sequence only when a previous control pulse sequence has ended. The duration of one Control pulse train depends on how long the relevant transmission circuit is activated. These Time span is always very long compared to that long pauses in the pulse.

It is also favorable with the remote control circuit mentioned, that only individual pulses are sent or received have to. This makes the circuit structure simple. It is for example infrared or ultrasonic remote control possible.

Advantageous refinements of the invention result from the subclaims and the following description of an embodiment. In the drawing shows

Fig. 1 is a block diagram of a transmitter,

Fig. 2 is a block diagram of a corresponding receiver,

Fig. 3 is a partial block diagram of a transmitter with three transmit circuits,

Fig. 4 is a partial block diagram of a receiver for the transmitter of Fig. 3 and

Fig. 5 shows another embodiment of a transmitter.

A remote control transmitter has several push buttons ( 1 ). These are assigned to the various functions of a device to be switched by the receiver, for example a crane. The key switches ( 1 ) switch a transmission circuit ( 2 ), which thereby generates a control pulse sequence ( 3 ) which corresponds to the key switch ( 1 ) actuated in each case.

In the case of the control pulse train ( 3 ), the pulse pauses (Tp 3 ) are very large in comparison to the pulse duration (Ti) . The pulse duty factor is approximately 100: 1, the pulse pause duration (Tp 3 ) being in the ms range. The control pulse sequence ( 3 ) can be coded either by binary pulse pause coding, or simply by the duration of the pulse pauses (Tp ) being different according to the actuated key switch ( 1 ).

The transmitter has a transmitter selector ( 4 ) in which the coding of the control pulse sequence ( 3 ) is overlaid with a second coding. The transmitter selector ( 4 ) is set to a desired second coding. If the transmitter selector ( 4 ) is switched to position "1", the control pulse sequence ( 3 ) remains unchanged. If the transmitter selector ( 4 ) is switched to the "2" position, a second pulse is added to each of the pulses of the control pulse train ( 3 ). This creates a labeling pulse group ( 5 ) (see FIG. 3). The distance (pulse pause duration Tp 5 ) of the pulses of the identification pulse group ( 5 ) is significantly smaller than the pulse pause duration (Tp 3 ). The pulse pause duration (Tp 5 ) is in the 10 ^{- 6} s range. In position "3" of the transmitter selector ( 4 ), the identification pulse group ( 5 ) has three individual pulses, the spacing of which is the same. In any case, the duration of the identification pulse group ( 5 ) is significantly shorter than the pulse pause duration ( Tp 3 ), which in the exemplary embodiment embodies the information about the respectively actuated key switch ( 1 ).

A power stage ( 6 ) is connected downstream of the transmitter selector ( 4 ) and controls an infrared diode ( 7 ). The infrared diode ( 7 ) emits infrared pulses in accordance with the respective control pulse sequence ( 3 ) and the identification pulse group ( 5 ).

The receiver has a receiving circuit ( 8 ) with a preamplifier ( 9 ) and a pulse shaper ( 10 ). All transmission pulse sequences ( 3 ) emitted by transmission circuits with the identification pulse groups ( 5 ) corresponding to the respective transmitter selector setting reach a receiver selector ( 11 ). This is set like the transmitter selector ( 4 ). If the receiver is to process control pulse sequences ( 3 ) of the transmitter or transmitters whose transmitter selector ( 4 ) is set to "1", the receiver selector ( 11 ) is also set to "1". If the receiver is to evaluate control pulse sequences ( 3 ) from the transmitter whose transmitter selector ( 4 ) is set to "2", then the receiver selector ( 11 ) is also set to "2". The receiver selector ( 11 ) forms the identification pulse groups ( 5 ), which the correspondingly set transmitter selector ( 4 ) generates, into individual pulses again, so that the original control pulse sequence ( 3 ) generated by the transmission circuit ( 2 ) in question arises again. This is evaluated by a decoder ( 12 ) so that one of the power outputs ( 13 ) is switched; namely the one that is assigned to the actuated key switch ( 1 ).

If, for example, two receivers arranged close to one another are provided, then the receiver selector ( 11 ) of the one receiver is set to "1" and the other receiver selector ( 11 ) to "2". Then there are at least one transmitter whose transmitter selector ( 4 ) is set to "1" and at least one transmitter is provided whose transmitter selector ( 4 ) is set to "2". With the transmitter set to "1", only the receiver set to "1" is controlled. With the transmitter set to "2", only the receiver set to "2" is then controlled, although both receivers receive the infrared pulses from both transmitters. It is therefore possible to control both receivers simultaneously.

In the exemplary embodiment according to FIG. 3, a transmitter with three transmitter circuits ( 2 ) and three transmitter selectors ( 4 ) is provided. Each of the transmitter selectors ( 4 ) is set to a different setting, so that control pulse sequences ( 3 ) with different identification pulse groups ( 5 ) are created.

The assigned receiver accordingly has three receiver selectors ( 11 ), which are set in accordance with the three transmitter selectors ( 4 ). If, for example, all three transmission circuits ( 2 ) are switched practically simultaneously, that is, in such a way that control pulse sequences ( 3 ) occur before the other control pulse sequences have ended, then a mixture of pulse sequences ( 14 ) occurs at the receiver selectors ( 11 ) (cf. FIG. 4) . Each receiver selector ( 11 ) only detects the identification pulse group ( 5 ) corresponding to it and forms it into individual pulses. This creates the original control pulse sequences ( 3 ) at the output of the receiver selectors ( 11 ), which are then evaluated via decoders ( 12 ). In FIG. 4, this sorting of a mixture pulse train (14) for marking groups of pulses (a, b, c).

It is evidently important that the pulse pauses (Tp 3 ) are long compared to the labeling pulse groups ( 5 ), so that it is highly likely that several labeling pulse groups ( 5 ) can fall within the pulse pause duration (Tp 3 ) without a coincidence of different labeling pulse groups ( 5 ) occurs frequently.

Should a large number of transmitters and receivers be operated in parallel then the mixture of impulses becomes so dense that the Probability of collapse of Labeling pulse groups becomes large.

In Fig. 5 a transmitter is described with which it is ensured that its control pulse train falls in the pulse pauses of other transmitted control pulse trains. A delay circuit ( 15 ) is placed between the transmitter selector ( 4 ) and the transmitter circuit ( 2 ) and is controlled by a pulse shaper ( 17 ) via a preamplifier ( 16 ). The preamplifier ( 16 ) detects the infrared pulses already sent by other transmitters. As long as such pulses are present, the delay circuit ( 15 ) blocks the transmission of the control pulse train ( 3 ). Only when no infrared pulses emitted by other transmitters are detected, does the delay circuit ( 15 ) release the coding of the control pulse sequence ( 3 ) in the transmitter selector ( 4 ).

The coding lying in the labeling pulse group (5) can be done (5 Tp) not only by the number whose marking impulses, but also through binary coding the pulse intervals.

It is also possible to work with control pulse trains ( 3 ) of the same pulse pause duration (Tp 3 ) for all transmission circuits and to place the coding of the respective transmission circuit and the function to be controlled in the identification pulse group. In this case, the - long - pulse pause duration (Tp 3 ) of the control pulse sequence only serves to enable parallel operation in that the different identification pulse groups can be nested in succession.

Instead of controlling the transmission circuits by Hand switches can also do this from data entry devices switched, d. H. to be activated.

Claims (5)

1.Remote control circuit for the parallel operation of transmitters and receivers, in which the transmitter circuit generates a control pulse train during its activation, in which the pulse pause is long in comparison with the pulse duration, and in which the receive circuit evaluates the received control pulse train and triggers the desired switching or control process , characterized in that in the transmitter each pulse of the control pulse train ( 3 ) is added to each transmitter circuit ( 2 ) typical identification pulse group ( 5 ), whereby each pulse of the control pulse train ( 3 ) results in the identification pulse group ( 5 ) and the pulse pauses (Tp 5 ) the identification pulses in the identification pulse group ( 5 ) are so short that the identification pulse groups ( 5 ) of several transmission circuits ( 2 ) can fall into a pulse pause (Tp 3 ) of the control pulses ( 3 ), and that each receiver first the identification pulse groups ( 5 ) evaluates the received pulse train ( 14 ) et. 2. Remote control circuit according to claim 1, characterized in that a plurality of transmitter circuits ( 2 ) and correspondingly a plurality of transmitter selectors ( 4 ) are provided in a transmitter and that a corresponding number of receiver selectors ( 11 ) is provided in the receiver. 3. Remote control circuit according to claim 1 or 2, characterized in that in the control pulse train ( 3 ) the functions to be controlled are represented by the pulse pauses (Tp 3 ) and are encoded either by the pulse pause duration or by a pulse code. 4. Remote control circuit according to one of the preceding claims, characterized in that the identification pulse group ( 5 ) comprises one of the relevant transmission circuit ( 2 ) typical number of identification pulses. 5. Remote control circuit according to one of the preceding claims, characterized in that the distance (Tp 5 ) of the identification pulses of the identification pulse groups ( 5 ) is the same. 6. Remote control circuit according to one of the preceding claims 1 or 2, characterized in that in the labeling pulse groups ( 5 ) the coding is carried out by a pulse code coding with different pulse pause times. 7. Remote control circuit according to one of the preceding claims, characterized in that the activation of the transmission circuit ( 2 ) by means of hand switches ( 1 ). 8. Remote control circuit according to one of the preceding claims, characterized in that the transmitter has a receiving device ( 16, 17 ) and a delay circuit ( 15 ) which, when a pulse train from another transmitter is received, prevents the transmission of a transmit pulse train until no pulse from another transmitter is received .