Re: unwanted echo of audio input

[Takashi Iwai <tiwai@suse.de>]

At Sun, 15 Jun 2003 13:08:13 -0400,
Chris Raphael wrote:
> 
> 
> Alsa Folks,
>   I am using ALSA 9.0 on a Dell Inspiron 8200 which uses the Intel 
> 82801CA-ICH3 card and CS4205 chip set.  I am writing a program
> that simulaneaously samples and plays audio.  The problem I am
> having is that everything that is captured by the microphone is
> automatically echoed to the speaker.  I have tried all of the
> mixer settings I can think of using alsamixer and cannot make the
> problem go away.  I have also tried to fix the problem from a c
> program using the OSS-style commands
> 
>   fd = open("dev/mixer",O_RDWR);
>   vol = 0;	
>   ioctl(fd,MIXER_WRITE(SOUND_MIXER_IMIX),&vol);
>  
> but without success --- the volume value is set to 0, as it should be,
> but no change in what actually happens.  (All of my other sound-related
> code uses the ALSA API).  

this echo volume corresponds to "Mic Playback Volume" and "Mic
Playback Switch".  these values have nothing to do with the capture
volume.  please try to mute "Mic" volume in alsamixer.


Takashi


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