Linux 2.6 - man page for cvanal (linux section 1)
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CVANAL(1) The Canonical Csound Reference CVANAL(1)
cvanal - Converts a soundfile into a single Fourier transform frame. .
Impulse Response Fourier Analysis for convolve operator
csound -U cvanal [flags] infilename outfilename
cvanal [flags] infilename outfilename
cvanal -- converts a soundfile into a single Fourier transform frame. The output file can
be used by the convolve operator to perform Fast Convolution between an input signal and
the original impulse response. Analysis is conditioned by the flags below. A space is
optional between the flag and its argument.
-s rate -- sampling rate of the audio input file. This will over-ride the srate of the
soundfile header, which otherwise applies. If neither is present, the default is 10000.
-c channel -- channel number sought. If omitted, the default is to process all channels.
If a value is given, only the selected channel will be processed.
-b begin -- beginning time (in seconds) of the audio segment to be analyzed. The default
-d duration -- duration (in seconds) of the audio segment to be analyzed. The default of
0.0 means to the end of the file.
cvanal asound cvfile
will analyze the soundfile "asound" to produce the file "cvfile" for the use with
To use data that is not already contained in a soundfile, a soundfile converter that
accepts text files may be used to create a standard audio file, e.g., the .DAT format for
SOX. This is useful for implementing FIR filters.
The output file has a special convolve header, containing details of the source audio
file. The analysis data is stored as "float", in rectangular (real/imaginary) form.
The analysis file is not system independent! Ensure that the original impulse
recording/data is retained. If/when required, the analysis file can be recreated.
Author: Greg Sullivan
Based on algorithm given in Elements Of Computer Music, by F. Richard Moore.
MIT Media Lab
MIT Media Lab,
5.07 06/23/2009 CVANAL(1)
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