On 06.05.2015 04:17, golden wrote: > > Dear PulseAudio folks, > > > We are using PulseAudio in our automotive project, the progress is pretty good so far. > I need some help for solving the sync problems between two speakers. > The pic below is the data flow of the two speakers: > > > > > without any syncing method, what we hear from the front-speaker is > ahead of the rear-speaker (real-spear is slower for sure), our goal is > that make the rear-speaker almost sync with (or catch up) the front > speaker. > Hi, with your manipulation of the audio and with module-loopback you introduce quite a lot of latency into the first path. Maybe you can simply set the latency of alsa-sink.1 larger than that of alsa-sink.0, not sure if this works. Otherwise I would suggest to make the paths look more or less equivalent, that would mean putting a module-loopback into the front speaker path. You could also try and use my (not yet reviewed) patches for module-loopback at http://thread.gmane.org/gmane.comp.audio.pulseaudio.general/22956 which allow a better control over the latency introduced by the module. If you use the patches and have a module-loopback in both paths you should be able to fully synchronize them by adjusting the latencies of the two modules. Regards Georg -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.freedesktop.org/archives/pulseaudio-discuss/attachments/20150506/7675e533/attachment-0001.html> -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: image/png Size: 66953 bytes Desc: not available URL: <http://lists.freedesktop.org/archives/pulseaudio-discuss/attachments/20150506/7675e533/attachment-0001.png>
