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Bluetooth clocking

The Bluetooth stack supports for a 64kbps u-Law/A-Law channels for telephony purpose. How does the clocking works in those channels?

I.e. which side of the Bluetooth link is a clock master and which is a slave?

Is the clock master/slave selection application dependent or is it defined in the protocol?

Many bluetooth modules provide I2S interface for direct connection to audio codec. This interface can be configured either as a master or a slave. How does the clocking work then? Is there a re-clocking somewhere in the transmit or receive chain?

Vladimir Vassilevsky DSP and Mixed Signal Design Consultant

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Vladimir Vassilevsky
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don't know how it done now, but when I many years ago was involved in the very first bluetooth stuff we did a resampler, the master set the rate the slave consumed/produced samples at that rate by adaptively changing the resample rate

I think some others just skipped/repeated samples

I think the clock spec. for bluetooth is something like +/-10ppm

-Lasse

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langwadt

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