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Re: [Discuss-gnuradio] Broadcast Receiver Audio Synchronization ( Delay

From: Fons Adriaensen
Subject: Re: [Discuss-gnuradio] Broadcast Receiver Audio Synchronization ( Delay locked loop for the two-clock problem)
Date: Sat, 12 Nov 2016 15:49:42 +0000
User-agent: Mutt/1.5.21 (2010-09-15)

On Sat, Nov 12, 2016 at 01:41:40PM +0000, Benny Alexandar wrote:
> Yes, but the input rate cannot be measured,

It can, even if the data stream has irregular timing. That's why there
is a DLL there. See the links posted before for how it works.

> But the codec can use the time stamp of the input bitstream which
> is stamped at RF sample entry time.

Again, such timestamps are useless for the resampler. It needs
to measure the flow of data on both ends of the buffer *using the
same clock* for both. Doesn't matter much which clock as long as
it's not too bad, but it must be same one as used to timestamp 
the blocks going to the audio driver. 



A world of exhaustive, reliable metadata would be an utopia.
It's also a pipe-dream, founded on self-delusion, nerd hubris
and hysterically inflated market opportunities. (Cory Doctorow)

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