Methods and apparatus for synchronizing networked audio devices

A system comprising:

• a network device having a network clock and a network counter containing a value indicative of the network clock time,
• an audio device having an audio clock and an audio counter containing a value indicative of the audio clock time,
• a first and second audio component, the first audio component to operate according to the network clock and the second audio component to operate according to the audio clock, and
• a machine readable medium programmed with a plurality of instructions, and
• a processor, upon executing the plurality of instructions, is caused to:
• determine an network counter value indicative of a network clock time of a system at a first time instant and a second time instant occurring later in time than the first time instant,
• determine a audio counter value indicative of an audio clock time of the system at a third time instant occurring between the first and second time instants and a fourth time instant occurring later in time than the second time instant,
• determine an offset based upon the determined network counter values and the audio counter values, and
• adjust the audio clock time based on the determined offset to synchronize operation of the first audio component the second audio component.

A system comprising:

• a plurality of network clocks, wherein one of the plurality of network clocks is selected as a base clock signal,
• a plurality of audio devices, each one of the audio devices to operate according to an associated one of the plurality of network clocks,
• a machine readable medium programmed with a plurality of instructions, and
• a computing device, upon executing the plurality of instructions, is caused to:
• sample each of the plurality of network clocks at a number of time instants, the number of time instants for sampling of each of the plurality of network clocks being a function of variability of each of the plurality of network clocks,
• determine an offset for each of the plurality of network clocks not used as the base clock signal, the offset of each of the plurality of the network clocks being a function of the determined samples of the respective network clock and the base clock signal,
• adjust each of the plurality of network clocks based upon a respective determined offset and the base clock signal, and
• operate each of the audio devices according to a respective adjusted network clock.