Experiment: better sound on remote end

Davide Scaini dscaini at gmail.com
Wed Dec 2 21:57:18 CET 2009

I have crackilg sound... so I want to figure out what to do... I
installed dictator (just not to spend tons of €) and then I play with
alsamixer opened. Now the questions:

1) How do I set a numeric value in the gsmhandset?
2) I set New value: 63:'Mic Sidetone Mux':1:3 but it seems it's not
persistent, if I open alsamixer i find Mic2 and not Left PGA... wtf?
3) It seems that my audio is everytime over saturated, that much that
any idea?

(it's about an year that i own this fr and i still don't use it as a
phone... wtf! :P)

rms at 1407.org ha scritto:
> Experiment: better sound on remote end
> http://blog.1407.org/2009/12/02/experiment-better-sound-on-remote-end/
> One of the problems people complain about my calls from the Freerunner is *bad*sound*.
> Lot's of background noise, static, etc. I'm not talking about the familiar buzz problem,
> as I've had the buzz fix applied to my phone.
> http://picasaweb.google.com/RuiMSeabra/DebConf9OpenMokoBuzzFixParty#
> However what I found to fix this problem on
> my phone model (GTA02v5 + buzz fix) goes totally against the official information.
> http://wiki.openmoko.org/wiki/Neo_Freerunner_audio_subsystem#Alsamixer_channel_controls
> So much so that there's at least one person who, from his very good knowledge about this
> subject (Really! This is *not* sarcasm!), thinks this fix is as good as putting some peanut
> butter over the microphone :)
> http://wiki.openmoko.org/index.php?title=Talk:Neo_Freerunner_audio_subsystem&oldid=77886
> I know of at least one other person who claims to have better sound on remote end from this fix,
> but I think I need to drop the challenge. Can you try the current SHR Unstable, apply this fix
> and then report on the mailing lists your results?
> You can? Good! So here's the fix:
> 	1. call someone who noticed your bad sound and check whether the sound is still bad, then
>            finish the call
> 	2. edit /etc/freesmartphone/alsa/default/gsmhandset
> 	3. change control 63 (it's also on line 63), so that it ends in 3 rather than in 2:
> 	 * Old value: 63:'Mic Sidetone Mux':1:2
> 	 * New value: 63:'Mic Sidetone Mux':1:3
> 	4. call that person again and check the result
> Alternatively, in one call, you can ssh into your phone and use alsamixer to change the same
> control, but this change will not be persistent until you do the steps above.
> http://blog.1407.org/wp-content/uploads/2009/12/oldValue.png
> http://blog.1407.org/wp-content/uploads/2009/12/newValue.png
> So let's hear your results, nothing like a good empirical experiment.
> In the following recordings (complete set here),
> http://files.1407.org/openmoko/mic_sidemux_test/
> I said «The quick brown fox jumps over the lazy dog» starting with Mic2, then Right PGA, then Left PGA.
> 	1. in perfect conditions;
>            http://files.1407.org/openmoko/mic_sidemux_test/test1-perfect-conditions.wav
> 	2. with tv making background noise (news);
>            http://files.1407.org/openmoko/mic_sidemux_test/test2-with-tv.wav
> 	3. 2. + computer playing loud music («Te Quiero Puta» from Rammstein) at the same time.
>            http://files.1407.org/openmoko/mic_sidemux_test/test3-with-tv-and-music.wav
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