64 lines
1.3 KiB
Plaintext
64 lines
1.3 KiB
Plaintext
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Speex Preprocessing Plugin
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==========================
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This plugin provides a pre-processing of a mono stream like denoise
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using libspeex DSP API. You can use the plugin with the plugin type
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"speex" like below:
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pcm.my_pcm {
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type speex
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slave.pcm "default"
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}
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Then record like
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% arecord -fdat -c1 -Dplug:my_pcm foo.wav
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so that you'll get 48kHz mono stream with the denoising effect.
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Right now, the plugin supports only a mono stream.
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The accepted format is only S16.
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The following parameters can be set optionally:
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* frames
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This controls the frames of the intermediate buffer. This
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corresponds to the latency of the filter. As default it's 64.
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* denoise
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A boolean value to enable/disable the denoise function. Default is
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yes.
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* agc
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A boolean value to enable/disable the auto-gain control function.
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Default is no.
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* agc_level
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A float value for the automatic gain-control level. Default is 8000.
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* dereverb
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A boolean value to enable/disable dereverb function. Default is no.
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* echo
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A boolean value to enable/disable echo-cancellation function.
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Default is no.
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* filter_length
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Number of samples of echo to cancel. As default it's 256.
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For example, you can enable agc like
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pcm.my_pcm {
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type speex
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slave.pcm "default"
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agc 1
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agc_level 8000
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}
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