Systems and methods for synchronizing multiple electronic devices

Patent metadata

Field	Value
Publication number	US-9967847-B2
Application number	US-201715794686-A
Country	US
Kind code	B2
Filing date	Oct 26, 2017
Priority date	Apr 29, 2013
Publication date	May 8, 2018
Grant date	May 8, 2018

Abstract

Embodiments are provided for syncing multiple electronic devices for collective audio playback. According to certain aspects, a master device connects ( 218 ) to a slave device via a wireless connection. The master device calculates ( 224 ) a network latency via a series of network latency pings with the slave device and sends ( 225 ) the network latency to the slave device. Further, the master devices sends ( 232 ) a portion of an audio file as well as a timing instruction including a system time to the slave device. The master device initiates ( 234 ) playback of the portion of the audio file and the slave devices initiates ( 236 ) playback of the portion of the audio file according to the timing instruction and a calculated system clock offset value.

First claim

What is claimed is:

1. A method comprising:
joining, by an audio playback device, an audio playback group, wherein the audio playback group includes a master device that provides timing information for playback of audio content by the audio playback group;
receiving, by the audio playback device from the master device, a timing signal;
determining, by the audio playback device based on the timing signal, a difference between a clock of the audio playback device and a clock of the master device;
retrieving from memory, by the audio playback device, the difference between the clock of the audio playback device and the clock of the master device;
receiving by the audio playback device from the master device, a first time corresponding to audio data to be played by the audio playback device as part of the audio playback group;
determining by the audio playback device, a second time based on (i) the first time and (ii) the difference between the clock of the audio playback device and the clock of the master device; and
playing, by the audio playback device, the audio data at the second time according to the clock of the audio playback device.

2. The method of claim 1 , wherein the audio playback device saves, in the memory, the difference between the clock of the audio playback device and the clock of the master device.

3. The method of claim 1 , wherein receiving the timing signal comprises:
receiving, by the audio playback device from the master device, at least one network latency ping indicating the clock of the master device.

4. The method of claim 1 , further comprising:
sending, by the audio playback device to the master device, a receipt timing signal, wherein the master device calculates a latency value based on the receipt timing signal;
receiving, by the audio playback device from the master device, the latency value; and
calculating a system clock offset value based on the latency value and the difference between the clock of the audio playback device and the clock of the master device.

5. The method of claim 4 , wherein determining the second time comprises:
determining the second time based on (i) the first time and (ii) the system clock offset value.

6. The method of claim 1 , wherein receiving the first time corresponding to the audio data to be played by the audio playback device as part of the audio playback group comprises:
receiving by the audio playback device from the master device, (i) the first time and (ii) the audio data.

7. The method of claim 1 , wherein playing the audio data at the second time comprises:
scheduling a playback of the audio data at the second time according to the clock of the audio playback device; and
at the second time, initiating the playback of the audio data by the audio playback device.

8. An audio playback device comprising:
a communication component for connecting the audio playback device to a master device;
a memory;
an audio output component for outputting audio; and
a controller module interfaced with the communication component, the memory, and the audio output component, and configured to:
join an audio playback group including the master device that provides timing information for playback of audio content by the audio playback group,
receive, from the master device via the communication component, a timing signal,
determine, based on the timing signal, a difference between a clock of the audio playback device and a clock of the master device,
retrieve, from the memory, the difference between the clock of the audio playback device and the clock of the master device,
receive, from the master device via the communication component, a first time corresponding to audio data to be played by the audio playback device as part of the audio playback group,
determine a second time based on (i) the first time and (ii) the difference between the clock of the audio playback device and the clock of the master device, and
cause the audio output component to play the audio data at the second time according to the clock of the audio playback device.

9. The audio playback device of claim 8 , wherein the controller module is further configured to:
cause the memory to save the difference between the clock of the audio playback device and the clock of the master device.

10. The audio playback device of claim 8 , wherein the controller module receives the timing signal as at least one network latency ping indicating the clock of the master device.

11. The audio playback device of claim 8 , wherein the controller module is further configured to:
send, to the master device via the communication component, a receipt timing signal, wherein the master device calculates a latency value based on the receipt timing signal,
receive, from the master device via the communication component, the latency value, and
calculate a system clock offset value based on the latency value and the difference between the clock of the audio playback device and the clock of the master device.

12. The audio playback device of claim 11 , wherein to determine the second time, the processor is configured to:
determine the second time based on (i) the first time and (ii) the system clock offset value.

13. The audio playback device of claim 8 , wherein the controller module receives, from the master device via the communication component, (i) the first time and (ii) the audio data.

14. The audio playback device of claim 8 , wherein to cause the audio output component to play the audio data at the second time, the controller module is configured to:
schedule a playback of the audio data at the second time according to the clock of the audio playback device, and
at the second time, cause the audio output component to initiate the playback of the audio data.

15. A method comprising:
joining, by an audio playback device, an audio playback group, wherein the audio playback group includes a master device that provides timing information for playback of audio content by the audio playback group;
retrieving from memory, by the audio playback device, data representing a difference between a clock of the audio playback device and a clock of the master device;
receiving by the audio playback device from the master device, a first time corresponding to audio data to be played by the audio playback device as part of the audio playback group;
determining, by the audio playback device, a second time based on (i) the first time and (ii) the difference between the clock of the audio playback device and the clock of the master device; and
playing, by the audio playback device, the audio data at the second time according to the clock of the audio playback device.

16. The method of claim 15 , wherein the audio playback device saves, in the memory, the difference between the clock of the audio playback device and the clock of the master device.

17. The method of claim 15 , further comprising:
receiving, by the audio playback device from the master device, a timing signal indicating the clock of the master device.

18. The method of claim 17 , further comprising:
determining, by the audio playback device based on the timing signal, the difference between the clock of the audio playback device and the clock of the master device.

19. The method of claim 17 , further comprising:
sending, by the audio playback device to the master device, a receipt timing signal, wherein the master device calculates a latency value based on the receipt timing signal;
receiving, by the audio playback device from t

Assignees

• Google Technology Holdings LLC

Inventors

• Daley Michael J
• Bolinger Travis
• O'Neal Heath

Classifications

• H04H20/61

  for local area broadcast, e.g. instore broadcast · CPC title

• H04W56/0015 Primary

  one node acting as a reference for the others · CPC title

• H04H20/18

  Arrangements for synchronising broadcast or distribution via plural systems · CPC title

• H04H60/88

  which are wireless networks · CPC title

• H04W56/0065

  using measurement of signal travel time · CPC title