/usr/share/doc/libasound2-plugins/speexdsp.txt is in libasound2-plugins 1.1.0-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 | 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
}
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