mkss

Calculate average spectrum of microphone input and save to file for spectral subtraction.

Synopsis

% mkss [options...] fileName

Description

mkss is a tool to estimate average spectrum of microphone input. The output file can be used for spectral subtraction on Julius.

It reads 3 seconds (the length can be changed by option) of audio data from microphone input, calculate its average spectrum and save it to a file. The output file can be used as (initial) noise spectrum data in Julius (option "-ssload").

The recording will start immediately after startup. Sampling format is 16bit, monaural. If output file already exist, it will be overridden.

Prerequisites

You need one audio capture device on your machine. If several devices are available, the default one will be used.

Installing

This tool will be installed together with Julius.

Usage

Record 3 seconds of audio data from microphone, save average spectrum to noise.ss, and use it in Julius

% mkss noise.ss
% julius ... -ssload noise.ss

Change recording length to 5 seconds

% mkss -len 5000 noise.ss

When the Julius uses non-default frame size or frame shift, you should also specify the same parameter to mkss:

% mkss -fsize 450 -fshift 80 noise.ss

Options

-freq Hz

Sampling frequency in Hz (default: 16,000)

-len msec

Capture length in milliseconds (default: 3000)

-fsize sampleNum

Frame size in number of samples (default: 400)

-fshift sampleNum

Frame shift in number of samples (default: 160)

License

This tool is licensed under the same license with Julius. See the license term of Julius for details.