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Linux 2.6 - man page for cvanal (linux section 1)

CVANAL(1)			  The Canonical Csound Reference			CVANAL(1)

NAME
       cvanal - Converts a soundfile into a single Fourier transform frame. .

DESCRIPTION
       Impulse Response Fourier Analysis for convolve operator

SYNTAX
	   csound -U cvanal [flags] infilename outfilename

	   cvanal [flags] infilename outfilename

INITIALIZATION
       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
       is 0.0

       -d duration -- duration (in seconds) of the audio segment to be analyzed. The default of
       0.0 means to the end of the file.

EXAMPLES
	   cvanal asound cvfile

       will analyze the soundfile "asound" to produce the file "cvfile" for the use with
       convolve.

       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.

   Files
       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.

	   Note
	   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.

CREDITS
       Author: Greg Sullivan

       Based on algorithm given in Elements Of Computer Music, by F. Richard Moore.

AUTHORS
       Barry Vercoe
       MIT Media Lab

	   Author.

       Dan Ellis
       MIT Media Lab,
		 Cambridge
		 Massachussetts

	   Author.

COPYRIGHT
5.07					    06/23/2009					CVANAL(1)


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