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Re: [Discuss-gnuradio] [USRP-users] Audio Synchronization


From: Marcus Müller
Subject: Re: [Discuss-gnuradio] [USRP-users] Audio Synchronization
Date: Mon, 20 Mar 2017 19:12:50 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0

Hi Ben,


please keep discussions on the list.


I don't fully understand your question. You, Fons and I (as well as others) had a very very lengthy discussion on why this is hard and how to do that on the mailing list a while back.


Best regards,

Marcus


On 03/19/2017 07:13 AM, Benny Alexandar wrote:

Hi Marcus,


I'm using digital radio (DRM) receiver.


How to synchronize the audio in digital radio reception with transmitter audio clock to avoid buffer over flow and under run ?


Audio In-> DRM Tx --->......--->USRP----> gr-drm---> Audio out


-ben


From: USRP-users <address@hidden> on behalf of Marcus Müller via USRP-users <address@hidden>
Sent: Sunday, March 19, 2017 12:03:11 AM
To: address@hidden
Subject: Re: [USRP-users] Audio Synchronization
 

Hi Benny,


what kind of broadcast are you referring to? AM, FM (which are analog audio, so you'd not have any audio clock), DRM, DAB/DAB+?

maybe a really quick block diagram would help me understand the issue at hand.


Best regards,

Marcus


On 18.03.2017 14:03, Benny Alexandar via USRP-users wrote:

Hi,


I'm implementing the broadcast receiver using USRP & GNU Radio. For audio synchronization with transmitter clock, should I use the RF local clock base band arriving sample time or estimate the audio clock after audio decoding ?


How to do the synchronization with audio transmitter clock ?


-ben



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