WO2009148751A4 - Time aligned group audio reproduction in narrowband and broadband networks - Google Patents
Time aligned group audio reproduction in narrowband and broadband networks Download PDFInfo
- Publication number
- WO2009148751A4 WO2009148751A4 PCT/US2009/042809 US2009042809W WO2009148751A4 WO 2009148751 A4 WO2009148751 A4 WO 2009148751A4 US 2009042809 W US2009042809 W US 2009042809W WO 2009148751 A4 WO2009148751 A4 WO 2009148751A4
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- WO
- WIPO (PCT)
- Prior art keywords
- controller
- end devices
- audio stream
- audio
- network
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/80—Responding to QoS
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/40—Support for services or applications
- H04L65/403—Arrangements for multi-party communication, e.g. for conferences
- H04L65/4046—Arrangements for multi-party communication, e.g. for conferences with distributed floor control
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/414—Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance
- H04N21/41415—Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance involving a public display, viewable by several users in a public space outside their home, e.g. movie theatre, information kiosk
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/4302—Content synchronisation processes, e.g. decoder synchronisation
- H04N21/4305—Synchronising client clock from received content stream, e.g. locking decoder clock with encoder clock, extraction of the PCR packets
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/4302—Content synchronisation processes, e.g. decoder synchronisation
- H04N21/4307—Synchronising the rendering of multiple content streams or additional data on devices, e.g. synchronisation of audio on a mobile phone with the video output on the TV screen
- H04N21/43076—Synchronising the rendering of multiple content streams or additional data on devices, e.g. synchronisation of audio on a mobile phone with the video output on the TV screen of the same content streams on multiple devices, e.g. when family members are watching the same movie on different devices
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/439—Processing of audio elementary streams
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/40—Connection management for selective distribution or broadcast
- H04W76/45—Connection management for selective distribution or broadcast for Push-to-Talk [PTT] or Push-to-Talk over cellular [PoC] services
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0852—Delays
- H04L43/0858—One way delays
Abstract
A method for synchronizing media reproduction across heterogeneous networks is presented. The networks include end-to-end IP broadband and narrowband simulcast networks that contain broadband and narrowband devices associated with a common communications group. A controller in the networks determines delay times for reproduction of a media stream across devices in the networks and establishes the longest delay time. The longest delay time is used to calculate appropriate transmission and reproduction timestamps to permit the devices to reproduce the provided media stream in synchronization. Narrowband base stations repeat the media stream at the time specified by a transmission timestamp, and broadband end devices reproduce the media stream at the time specified by a reproduction timestamp. By synchronizing the presentation time, the devices present the media at substantially the same time and are granted fair rights to communicate with one another.
Claims
AMENDED CLAIMS received by the International Bureau on 19 April 2010 (19.04.2010)
] . A method of coordinating audio reproduction for heterogeneous end devices ( 130, 132, 133) in heterogeneous first and second networks (102, 103), the method comprising: receiving an audio signal (140) from one of the end devices (130, 132, 133); associating a first timestamp with a first audio stream (144) and a second timestamp with a second audio stream (145), the first and second timestamps being different, each of the first and second audio streams (144, 145) containing audio information of the received audio signal; and sending the first audio stream (144) to a first end device (132) in the first network (102) and the second audio stream (145) to a second end device (133) in the second network (103), the first and second timestamps providing timing information such that the audio signal is reproducible by the first and second end devices (132, 133) at a substantially simultaneous time.
2. The method of claim 1 , wherein the first network is a narrowband simulcast network, the first end device is a narrowband end device, the first timestamp comprises a GPS-derived simulcast transmission timestamp, the second network is an IP-enabled broadband network, the second end device is an IP-enabled broadband end device, and the second timestamp comprises a lime-of-day reproduction timestamp.
3. The method of claim 1 , further comprising delaying reproduction of the audio signal in the first network using the first timestamp and in the second network using the second timestamp, the reproduction being delayed to account for a longest delay in the first and second networks, the longest delay being a longest time interval between when the first and second audio streams are sent from a controller to the heterogeneous end devices to when a last of the heterogeneous end devices reproduces the audio signal.
4. The method of claim 3, wherein generation of the first and second timestamps occur within a single controller, further comprising the controller calculating the first and second timestamps using an algorithm having:
30 a first quantity equaling a first delay between when the first audio stream is sent from a controller to when an intermediary responsible for forwarding the first audio stream to a last of first end devices in the first network receives the first audio stream plus a time to process the first audio signal in the last of the first end devices, a second quantity equaling a second delay between when the second audio stream is sent from a controller to when a last of second end devices in the second network receives the second audio stream plus a time to process the second audio signal in the last of the second end devices, a third quantity equaling the product of N and the time represented by a single frame of audio, where N is a monotonically increasing integer starting at 0 and incremented for each successive audio frame processed, and an initial clock time initialized at the start of the first audio stream, in which in the algorithm: if the longest delay is a result of the delay between the controller and one of the end devices in the first network, then: the first timestamp is equal to the initial clock time plus the first quantity minus the time to process the first audio signal in the last of the first end devices plus the third quantity, and the second timestamp is equal to the initial clock time plus the first quantity plus the third quantity; otherwise if the longest delay is a result of the delay between the controller and one of the second end devices, then: the first limestamp is equal to the initial clock lime plus the second quantity minus the time to process the first audio signal in the last of the first end devices plus the third quantity, and the second timestamp is equal to the initial clock time plus the second quantity plus the third quantity.
5. The method of claim 3, wherein generation of the first and second timcslamps occurs within first and second controllers, respectively, the first and second controllers
31 are different, and the second controller adheres to the interface behaviours of a first base station in the first network.
6. The method of claim 3, wherein generation of the first and second timestamps occurs within first and second controllers, respectively, the first and second controllers are different, the second controller provides a one-way delay measurement to the first controller, and the one-way delay measurement is calculated using an algorithm having: a first quantity equaling a first delay between when the first audio stream is sent from the first controller to when the second controller receives the first audio stream, the second controller responsible for forwarding the second audio stream to a last of second end devices in the second network, and a second quantity equaling a second delay between when the second audio stream is sent from the second controller to when the last of second end devices in the second network receives the second audio stream plus a time to process the second audio signal in the last of the second end devices, in which: the one-way delay measurement calculated by the second controller and returned to the first controller is equal to the first quantity plus the second quantity minus a time to process the first audio signal in the last of the first end devices.
7. The method of claim 3 wherein generation of the first and second timestamps occurs within first and second controllers, respectively, the first and second controllers are different, the method further comprising calculating the first and second timestamps using an algorithm having: a first quantity equaling a first delay between when the first audio stream is sent from the first controller to when an intermediary responsible for forwarding the first audio stream to a last of first end devices in the first network receives the first audio stream, a second quantity equaling a second delay between when the first audio stream is sent from the first controller to when the second controller receives the first audio stream, the second controller responsible for forwarding the second audio stream to a last of second end devices in the second network, a third quantity equaling a third delay between when the second audio stream is sent from the second controller to when the last of second end devices in the second network receives the second audio stream plus a time to process the second audio signal in the last of the second end devices, a fourth quantity equaling the second quantity plus the third quantity minus a time to process the first audio signal in the last of the first end devices, a fifth quantity equaling the larger of first or fourth quantities, a sixth quantity equaling the product of N and the lime represented by a single frame of audio, where N is a monotonically increasing integer starting at 0 and incremented for each successive audio frame processed, and an initial clock time initialized at the start of the first audio stream, in which: the first timestamp is equal to the initial clock time plus the fifth quantity plus the sixth quantity, and the second timestamp is equal to the first timestamp plus the time to process the first audio signal in the last of the first end devices.
8. The method of claim 3, further comprising adjusting the longest delay to reproduce the audio signal whenever at least one heterogeneous end device joins or
33 leaves a group including the first and second end devices if the at least one heterogeneous end device affects the longest delay in a statistically significantly fashion.
9. The method of claim 1 , further comprising: calculating a delay from when an initial signal is sent from a controller to a particular heterogeneous end device to when the particular heterogeneous end device reproduces the initial signal for each of the heterogeneous end devices; discarding the calculated delays that are in a statistically significant percentile of the delays calculated to establish a longest delay; and delaying the reproduction of the audio signal, using the first and second timestamps, to account for the longest delay.
10. A network comprising: a first network (102) having first base stations (120) and first end devices (130, 132); a second network (103) having second base stations (121) and second end devices (133), the first and second end devices (130, 132, 133) being heterogeneous; and a controller (104, 204, 205) that: receives an audio signal (140) from one of the first or second end devices (130, 132, 133), associates a first timestamp with a first audio stream (144) and a second timestamp with a second audio stream (145), each of the first and second audio streams (144, 145) containing audio information of the received audio signal, the first and second timestamps being different and providing timing information such that the audio signal is reproducible by the first and second end devices (130, 132, 133) at a substantially simultaneous time, sends the first audio stream (144) and the first timeslamp to at least one of the first base stations (120), and sends the second audio stream (145) and the second timestamp to at least one of the second base stations (121),
34 the at least one of the first base stations (120) transmitting the first audio stream (144) to a first end device (132) associated with the at least one of the first base stations (120) at a time indicated by the first timestamp, the at least one of the second base stations (121) transmitting the second audio stream (145) to a second end device (133) associated with the at least one of the second base stations (145), and the second end device (133) reproducing the audio signal contained in the second audio stream (145) at a time indicated by the second timestamp.
1 1. The network of claim 10, wherein the first network is a narrowband simulcast network, the first base stations are narrowband simulcast base stations, the first end devices are narrowband end devices, the first timestamp is a GPS-deiϊved simulcast transmission timestamp, the second network is an IP-enabled broadband network, the second base stations are IP-enabled broadband base stations, the second end devices are IP-enabled broadband end devices, and the second timestamp comprises a lime-of-day reproduction timestamp.
12. The network of claim 10, wherein the controller further calculates and stores a longest delay for reproduction of the audio signal and accommodates the longest delay using the first and second timestamps, the longest delay being a longest time interval between when the first and second audio streams are sent from the controller to the first and second end devices to when a last of the first and second end devices reproduces the audio signal.
13. The network of claim 10, wherein the controller receives delay measurements from the first base stations and second end devices and calculates the longest delay using the delay measurements.
14. The network of claim 10, wherein the controller further:
35 calculates a delay from when an initial signal is sent from the controller to a particular first or second end device to when the- particular first or second end device reproduces the initial signal for each of the first and second end devices; discards the calculated delays that are in a statistically significant percentile of longest delays calculated to establish a longest delay of the calculated delays that have not been discarded; and stores the longest delay for reproduction of the audio signal; and calculates the first and second timestamps using the longest delay .
15. The network of claim 10, wherein generation of the first and second timestamps occur within a single controller, the network further comprising a controller calculating the first and second timestamps using an algorithm having: a first quantity equaling a first delay between when the first audio stream is sent from the controller to when a first base station forwarding the first audio stream to a last of the first end devices receives the first audio stream plus a time to process the first audio signal in the last of the first end devices, a second quantity equaling a second delay between when the second audio stream is sent from the controller to when a last of the second end devices receives the second audio stream plus a time to process the second audio signal in the last of the second end devices, a third quantity equaling the product of N and the time represented by a single frame of audio, where N is a monotonically increasing integer starting at 0 and incremented for each successive audio frame processed, and an initial clock time initialized at the start of the first audio stream, in which in the algorithm: if the longest delay is a result of the delay between the controller and one of the first end devices, then: the first timestamp is equal to the initial clock lime plus the first quantity minus the time to process the first audio signal in the last of the first end devices plus the third quantity, and
36 the second timestamp is equal to the initial clock lime plus the first quantity plus the third quantity; otherwise if the longest delay is a result of the delay between the controller and one of the second end devices, then: the first timestamp is equal to the initial clock time plus the second quantity minus the time to process the first audio signal in the last of the first end devices plus the third quantity, and the second timestamp is equal to the initial clock time plus the second quantity plus the third quantity.
16. The network of claim 10, wherein the controller comprises a first controller and a second controller, the first controller sending the first audio stream and the first timestamp to both the first base stations and to the second controller, the second controller generating the second timestamp in response to receiving the first timestamp and sending the second audio stream and the second timestamp to the second end devices through the second base stations.
37
17. The network configuration of claim 16, wherein the second controller adheres to the interface behaviours of a first base station in the first network.
18. The network configuration of claim 16, wherein the second controller provides a one-way delay measurement to the first controller, the one-way delay measurement is calculated using an algorithm having: a first quantity equaling a first delay between when the first audio stream is sent from the first controller to when the second controller receives the first audio stream, the second controller responsible for forwarding the second audio stream to a last of second end devices in the second network, and a second quantity equaling a second delay between when the second audio stream is sent from the second controller to when the last of second end devices in the second network receives the second audio stream plus a time to process the second audio signal in the last of the second end devices, in which: the one-way delay measurement calculated by the second controller and returned to the first controller is equal to the first quantity plus the second quantity minus a time to process the first audio signal in the last of the first end devices.
38
19. The network configuration of claim 16, wherein the first controller calculates the first and second delays using an algorithm having: a first quantity equaling a first delay between when the first audio stream is sent from the first controller to when a first base station responsible for forwarding the first audio stream to a last of first end devices in the first network receives the first audio stream, a second quantity equaling a second delay between when the first audio stream is sent from the first controller to when the second controller receives the first audio stream, the second controller responsible for forwarding the second audio stream to a last of second end devices in the second network, a third quantity equaling a third delay between when the second audio stream is sent from the second controller to when the last of second end devices in the second network receives the second audio stream plus a time to process the second audio signal in the last of the second end devices, a fourth quantity equaling the second quantity plus the third quantity minus the time to process the first audio signal in the last of the first end devices, a fifth quantity equaling the larger of first or fourth quantities, a sixth quantity equaling the product of N and the time represented by a single frame of audio, where N is a monotonically increasing integer starting at 0 and incremented for each successive audio frame processed, and an initial clock time initialized at the start of the first audio stream, in which: the first timestamp is equal to the initial clock time plus the fifth quantity plus the sixth quantity, and the second timestamp is equal to the first timestamp plus the time to process the first audio signal in the last of the first end devices.
39
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2726770A CA2726770C (en) | 2008-06-05 | 2009-05-05 | Time aligned group audio reproduction in narrowband and broadband networks |
| AU2009255476A AU2009255476B2 (en) | 2008-06-05 | 2009-05-05 | Time aligned group audio reproduction in narrowband and broadband networks |
| EP09758914.7A EP2291975B1 (en) | 2008-06-05 | 2009-05-05 | Time aligned group audio reproduction in narrowband and broadband networks |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US12/133,882 | 2008-06-05 | ||
| US12/133,882 US7899193B2 (en) | 2008-06-05 | 2008-06-05 | Time aligned group audio reproduction in narrowband and broadband networks |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| WO2009148751A2 WO2009148751A2 (en) | 2009-12-10 |
| WO2009148751A3 WO2009148751A3 (en) | 2010-04-15 |
| WO2009148751A4 true WO2009148751A4 (en) | 2010-06-10 |
Family
ID=41398758
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US2009/042809 WO2009148751A2 (en) | 2008-06-05 | 2009-05-05 | Time aligned group audio reproduction in narrowband and broadband networks |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US7899193B2 (en) |
| EP (1) | EP2291975B1 (en) |
| AU (1) | AU2009255476B2 (en) |
| CA (1) | CA2726770C (en) |
| WO (1) | WO2009148751A2 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8675649B2 (en) | 2008-11-18 | 2014-03-18 | Yamaha Corporation | Audio network system and method of detecting topology in audio signal transmitting system |
| CN105898857B (en) * | 2009-06-23 | 2021-05-07 | 北京三星通信技术研究有限公司 | Data synchronization method and system |
| DE102011117283A1 (en) * | 2011-10-31 | 2013-05-02 | Merkur Media GmbH | Method for transmitting information |
| US9521449B2 (en) * | 2012-12-24 | 2016-12-13 | Intel Corporation | Techniques for audio synchronization |
| US10212065B2 (en) * | 2016-10-20 | 2019-02-19 | Gatesair, Inc. | Extended time reference generation |
| US11290862B2 (en) | 2017-12-27 | 2022-03-29 | Motorola Solutions, Inc. | Methods and systems for generating time-synchronized audio messages of different content in a talkgroup |
| US10341609B1 (en) | 2018-01-17 | 2019-07-02 | Motorola Solutions, Inc. | Group video synchronization |
| US10250936B1 (en) | 2018-01-17 | 2019-04-02 | Motorola Solutions, Inc. | Transmission of group video synchronization to other radios |
| EP3794880A1 (en) | 2018-06-20 | 2021-03-24 | Sony Corporation | Infrastructure equipment, communications device and methods |
| KR102369682B1 (en) * | 2020-05-07 | 2022-03-04 | (주)뮤직몹 | System for providing a playing music information |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5485632A (en) | 1993-02-26 | 1996-01-16 | Motorola, Inc. | Method for initiating and determining simulcast transmission of a message |
| US6253207B1 (en) * | 1997-09-25 | 2001-06-26 | Lucent Technologies Inc. | Method and apparatus for transporting multimedia information over heterogeneous wide area networks |
| US20060133309A1 (en) * | 2004-12-21 | 2006-06-22 | Mathis James E | Methods for synchronization of communications between a circuit switched network and a packet data network |
| US7672465B2 (en) * | 2005-01-14 | 2010-03-02 | Sony Corporation | System and method for synchronization using GPS in home network |
| US20090013086A1 (en) * | 2007-02-08 | 2009-01-08 | Yair Greenbaum | System and method for live video and audio discussion streaming to multiple users |
-
2008
- 2008-06-05 US US12/133,882 patent/US7899193B2/en active Active
-
2009
- 2009-05-05 EP EP09758914.7A patent/EP2291975B1/en active Active
- 2009-05-05 WO PCT/US2009/042809 patent/WO2009148751A2/en active Application Filing
- 2009-05-05 CA CA2726770A patent/CA2726770C/en active Active
- 2009-05-05 AU AU2009255476A patent/AU2009255476B2/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| EP2291975A2 (en) | 2011-03-09 |
| CA2726770C (en) | 2014-02-11 |
| CA2726770A1 (en) | 2009-12-10 |
| US7899193B2 (en) | 2011-03-01 |
| US20090304201A1 (en) | 2009-12-10 |
| EP2291975B1 (en) | 2017-04-12 |
| WO2009148751A2 (en) | 2009-12-10 |
| AU2009255476A1 (en) | 2009-12-10 |
| WO2009148751A3 (en) | 2010-04-15 |
| AU2009255476B2 (en) | 2013-06-20 |
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