Systems and methods for synchronizing operations among a plurality of independently clocked digital data processing devices without a voltage controlled crystal oscillator
First Claim
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1. A digital data processing device comprising:
- an interface to receive multimedia information arranged as a plurality of frames, each frame to include a plurality of samples and a time stamp for playback of the samples in a frame;
an information buffer to store the plurality of frames for play back by the digital data processing device,wherein the digital data processing device is to receive clock information from a source device and determine a time differential value between the received clock information and clock information associated with the digital data processing device, the time differential value to be applied to the time stamp for each of the plurality of frames to store an updated time stamp for each of the plurality of frames in the information buffer; and
an output to play back the samples in a frame from the information buffer according to the updated time stamp for the frame,wherein the digital data processing device is to adjust, based on a comparison between the updated time stamp for the frame and a predicted time value for play back of the frame, a number of samples per frame that are to be played.
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Abstract
Exemplary systems and methods include a distribution device that maintains a dock rate and distributes a series of tasks to a group of execution devices. Each task has a plurality of samples per frame associated with a time stamp indicating when the task is to be executed. The execution devices execute the series of tasks at the times indicated and adjust the number of samples per frame in relation to the dock rate maintained by the distribution device.
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Citations
20 Claims
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1. A digital data processing device comprising:
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an interface to receive multimedia information arranged as a plurality of frames, each frame to include a plurality of samples and a time stamp for playback of the samples in a frame; an information buffer to store the plurality of frames for play back by the digital data processing device, wherein the digital data processing device is to receive clock information from a source device and determine a time differential value between the received clock information and clock information associated with the digital data processing device, the time differential value to be applied to the time stamp for each of the plurality of frames to store an updated time stamp for each of the plurality of frames in the information buffer; and an output to play back the samples in a frame from the information buffer according to the updated time stamp for the frame, wherein the digital data processing device is to adjust, based on a comparison between the updated time stamp for the frame and a predicted time value for play back of the frame, a number of samples per frame that are to be played. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for synchronizing audio playback, the method comprising:
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receiving, by a playback device, audio information including a plurality of frames from a source device over a network, wherein each frame of the plurality of frames includes audio samples and a time stamp indicating when to play the audio samples of the respective frame; updating the time stamp for each of the plurality of frames using a time differential value determined between clock information received from the source device and clock information associated with the playback device; storing the updated time stamp for each of the plurality of frames; and outputting audio information based on the plurality of frames and associated updated time stamps via the playback device; and adjusting, based on a comparison between the updated time stamp for the frame and a predicted time value for play back of the frame, a number of samples per frame to be output. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A non-transitory computer-readable storage medium including instructions executable by a processor, the instructions, when executed by the processor, performing a method for synchronizing multimedia playback, the method comprising:
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receiving, by a playback device, audio information including a plurality of frames from a source device over a network, wherein each frame of the plurality of frames includes audio samples and a time stamp indicating when to play the audio samples of the respective frame; updating the time stamp for each of the plurality of frames using a time differential value determined between clock information received from the source device and clock information associated with the playback device; storing the updated time stamp for each of the plurality of frames; outputting audio information based on the plurality of frames and associated updated time stamps via the playback device; and adjusting, based on a comparison between the updated time stamp for the frame and a predicted time value for play back of the frame, a number of samples per frame to be output. - View Dependent Claims (17, 18, 19, 20)
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Specification