SYSTEMS AND METHODS FOR SYNCHRONIZING OPERATIONS AMONG A PLURALITY OF INDEPENDENTLY CLOCKED DIGITAL DATA PROCESSING DEVICES WITHOUT A VOLTAGE CONTROLLED CRYSTAL OSCILLATOR

摘要

Example systems, apparatus, and methods receive audio information including a plurality of frames from a source device, wherein each frame of the plurality of frames includes one or more audio samples and a time stamp indicating when to play the one or more audio samples of the respective frame. In an example, the time stamp is updated 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 device. The updated time stamp is stored for each of the plurality of frames, and the audio information is output based on the plurality of frames and associated updated time stamps. A number of samples per frame to be output is adjusted based on a comparison between the updated time stamp for the frame and a predicted time value for play back of the frame.

主权项

1. A digital data processing device comprising:
an interface to receive multimedia information arranged as a plurality of frames, each frame to include one or more samples and a time stamp for playback of the one or more 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 one or more 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.