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a52.txt	2.07 KB	-rw-r--r--
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changelog.Debian.gz	937 B	-rw-r--r--
copyright	1.49 KB	-rw-r--r--
lavrate.txt	1.01 KB	-rw-r--r--
README-arcam-av	1012 B	-rw-r--r--
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README-pcm-oss	1.02 KB	-rw-r--r--
README-pulse	1.9 KB	-rw-r--r--
samplerate.txt	933 B	-rw-r--r--
speexdsp.txt	1.27 KB	-rw-r--r--
speexrate.txt	958 B	-rw-r--r--
upmix.txt	1.21 KB	-rw-r--r--
vdownmix.txt	560 B	-rw-r--r--

Code Editor : speexdsp.txt

Speex Preprocessing Plugin
==========================

This plugin provides a pre-processing of a mono stream like denoise
using libspeex DSP API.  You can use the plugin with the plugin type
"speex" like below:

pcm.my_pcm {
		type speex
		slave.pcm "default"
	}

Then record like

% arecord -fdat -c1 -Dplug:my_pcm foo.wav

so that you'll get 48kHz mono stream with the denoising effect.

Right now, the plugin supports only a mono stream.
The accepted format is only S16.

The following parameters can be set optionally:

* frames

This controls the frames of the intermediate buffer.  This
  corresponds to the latency of the filter.  As default it's 64.

* denoise

A boolean value to enable/disable the denoise function.  Default is
  yes.

* agc
   
  A boolean value to enable/disable the auto-gain control function.
  Default is no.

* agc_level

A float value for the automatic gain-control level.  Default is 8000.

* dereverb

A boolean value to enable/disable dereverb function.  Default is no.

* echo

A boolean value to enable/disable echo-cancellation function.
  Default is no.

* filter_length

Number of samples of echo to cancel.  As default it's 256.

For example, you can enable agc like

pcm.my_pcm {
		type speex
		slave.pcm "default"
		agc 1
		agc_level 8000
	}

${this.title}

Code Editor : speexdsp.txt