On Sep 2, 2017, at 06:26, benravin <ben.alex@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!

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| Frederick F. Gleason, Jr. |              Chief Developer             |

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