On Sep 2, 2017, at 06:26, benravin <ben.a...@outlook.com> wrote: > If audio sample rate of a radio receiver has to be matched with respect to > transmitter radio station audio sample rate, then some timing information > has to be derived. But, in case of broadcast digital radio receivers, there > is no information about the time stamps in the received data as metadata > information. How to timestamp and do the drift compensation in this > scenario?
One approach that I’ve used with good success here is to run the decoded PCM through a FIFO buffer between the SRC and the play-out stages and then use the size of that FIFO (which will change dynamically in response to things like network congestion) to feed a PLL that drives the converter ratio for the SRC stage. The trade-off for this approach of course is increased latency. If true low-latency operation is required, then some sort of clocking (ala AES67) will be required. Cheers! |----------------------------------------------------------------------| | Frederick F. Gleason, Jr. | Chief Developer | | | Paravel Systems | |----------------------------------------------------------------------| | A room without books is like a body without a soul. | | -- Cicero | |----------------------------------------------------------------------|
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