Wireless speaker system
First Claim
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1. A wireless speaker system comprising:
- a first wireless earphone comprising;
a first speaker; and
a wireless transceiver configured to receive timestamped audio source data from an audio source device, generate a synchronization delay based on the timestamped audio source data, transmit the audio source data and synchronization delay, and decompress the timestamped audio source data for playback through the first speaker; and
a second wireless earphone comprising;
a second speaker; and
a wireless transceiver configured to receive the time-stamped audio source data and the synchronization delay from the first wireless earphone and decompress the timestamped audio source data for playback through the second speaker;
wherein;
an inherent latency of the wireless speaker system is less than about 500 ms; and
the synchronization delay is greater than or equal to the inherent latency of the wireless speaker system.
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Abstract
Wireless speaker systems and methods for synchronous audio playback. Speaker systems can comprise more than one wireless speaker assembly, such as wireless earphones, in serial communication with an audio source device, such as a smartphone. Separate audio rendering by each wireless speaker assembly and synchronization of audio playback by imposing a fixed latency from an output timestamp associated with the audio source data, and rate matching the sample allow for tightly synchronized playback of stereo audio at low latency.
38 Citations
18 Claims
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1. A wireless speaker system comprising:
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a first wireless earphone comprising; a first speaker; and a wireless transceiver configured to receive timestamped audio source data from an audio source device, generate a synchronization delay based on the timestamped audio source data, transmit the audio source data and synchronization delay, and decompress the timestamped audio source data for playback through the first speaker; and a second wireless earphone comprising; a second speaker; and a wireless transceiver configured to receive the time-stamped audio source data and the synchronization delay from the first wireless earphone and decompress the timestamped audio source data for playback through the second speaker; wherein; an inherent latency of the wireless speaker system is less than about 500 ms; and the synchronization delay is greater than or equal to the inherent latency of the wireless speaker system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of synchronously playing audio through a wireless speaker system comprising a plurality of wireless speaker assemblies, the method comprising:
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pairing a first wireless speaker assembly to an audio source device; pairing a second wireless speaker assembly to the first wireless speaker assembly, wherein the second wireless speaker assembly is designated the slave in a master/slave configuration with the first wireless speaker assembly; receiving, at the first wireless speaker assembly, audio source data from the audio source device; transmitting at least a portion of the audio source data from the first wireless speaker assembly to the second wireless speaker assembly; separately decompressing at least a portion of the audio source data on each of the first and second wireless speaker assemblies, respectively; and synchronizing the decompressed audio source data at the first and second wireless speaker assemblies, the synchronization comprising; delaying playback of the decompressed audio source data at the first wireless speaker assembly and playback of the decompressed audio source data at the second wireless speaker assembly by a synchronization delay, the synchronization delay being fixed relative to an output timestamp embedded in the audio source data; and matching a sample playback rate of the decompressed audio source data at the second wireless speaker assembly to that of the first wireless speaker assembly;
whereinthe synchronization delay is greater than or equal to an inherent latency of the wireless speaker system; the inherent latency of the wireless speaker system is less than about 500 ms; and the playback of the decompressed audio source data by the first and second wireless speaker assemblies is synchronized to a variance of less than about 10 ms or less than about 100 samples. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification