Plugin for amplifying microphone (software "mic boost")

Plugin for amplifying microphone (software "mic boost")

[Ilya Konstantinov]

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Hi,

I'm trying to add software amplification to my Bluetooth headset (which
works through the ALSA userspace plugin developed by the Bluetooth-alsa
project). On the ALSA plugins page, I've seen two plugins which seemed
somehow relevant: softvol and route.

Can any of them allow me to amplify the audio (yes, I'm aware that software
amp. is worse), or is there some other way?

Thanks.

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Re: Plugin for amplifying microphone (software "mic boost")

[Takashi Iwai]

At Wed, 10 Jan 2007 12:24:02 +0200,
Ilya Konstantinov wrote:
> 
> Hi,
> 
> I'm trying to add software amplification to my Bluetooth headset (which works through
> the ALSA userspace plugin developed by the Bluetooth-alsa project). On the ALSA
> plugins page, I've seen two plugins which seemed somehow relevant: softvol and route.
> 
> Can any of them allow me to amplify the audio (yes, I'm aware that software amp. is
> worse), or is there some other way?

The softvol plugin doesn't support amplifying but only attenuation
(for optimization).

OTOH, the route plugin supports amplifying, but it doesn't have
dynamic volume controls.  If you need only fixed amplification, this
should work.


Takashi

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Re: Plugin for amplifying microphone (software "mic boost")

[Ilya Konstantinov]

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On 1/10/07, Takashi Iwai <tiwai@suse.de> wrote:
>
> OTOH, the route plugin supports amplifying, but it doesn't have
> dynamic volume controls.  If you need only fixed amplification, this
> should work.


Thanks guys. This indeed worked.

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Re: Plugin for amplifying microphone (software "mic boost")

[Alexander E. Patrakov]

Ilya Konstantinov wrote:
> Hi,
> 
> I'm trying to add software amplification to my Bluetooth headset (which 
> works through the ALSA userspace plugin developed by the Bluetooth-alsa 
> project). On the ALSA plugins page, I've seen two plugins which seemed 
> somehow relevant: softvol and route.
> 
> Can any of them allow me to amplify the audio (yes, I'm aware that 
> software amp. is worse), or is there some other way?

For the real microphone, +6 dB boost:

pcm.!default {
     type asym
     playback.pcm "plug:dmix"
     capture.pcm {
         type route
         slave.pcm "plug:dsnoop"
         ttable.0.0 2.0
         ttable.0.1 0.0
         ttable.1.0 0.0
         ttable.1.1 2.0
     }
}

-- 
Alexander E. Patrakov


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