Re: [Alsa-user] increase default gain for arecord -- sphinx

[Paul H. <pau...@gm...>]

On Tue, Apr 21, 2009 at 2:08 PM, gregory mitchell
<rad...@gm...> wrote:
> I don't think my original message went through somehow.  Please forgive me
> if this is a repost.

Hi, the first post did get through.

>> Trying to use "pocketsphinx_continuous" and "pocketsphinx_tidigits" speech
>> recognition from bash commandline on a zaurus 3200 with a wm8750 audio
>> controller.
>>
>> Basically not getting much of any recognition at all.  Thinking this is
>> due to my alsa configuration.
>>
>> I can record using sox fairly well if I increase the gain with a command
>> such as:
>>
>> rec -S -c1 -r24k test.wav vol 120
>>
>> However, I'm not sure how to increase volume gains for "arecord" and/or
>> "pocketsphinx_continuous".
>>
>> "arecord" produces very silent garbled recordings.
>>
>> I already have my input source maxed out in alsamixer. Any ideas how to
>> set the default gain of alsa higher?
>
> It's been suggested to me that my wm8750 driver is broken, but aside from
> rebuilding sources, is there a way to increase default input gain in alsa?

amixer (rather than alsamixer) should let you set the gain to a
specific value, either a %, a dB, or specific hardware value. I don't
know if that's any different than putting the slider all the way up in
alsamixer but maybe it's worth a try. Also if you have multiple inputs
maybe try the other (mic versus line in), maybe they have different
levels.