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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.

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