envext(1) [debian man page]

ENVEXT(1)						  The Canonical Csound Reference						 ENVEXT(1)

NAME

       envext - Extracts the envelope of a file to a text file. .

SYNTAX

	   envext [-flags] soundfile

	   csound -U envext [-flags] soundfile

INITIALIZATION

       soundfile - Name of the input soundfile.

       The following flags are available for envext (The default values are stated in parenthesis):
	   -o fnam Name of output filename (newenv)
	   -w size (in seconds) of analysis window (0.25)

       The envext utility generates a text file containing time and amplitude pairs by finding the absolute peak within each window.

EXAMPLE

       Using the command (while in the manual directory):

	   csound -U envext examples/mary.wav

       will produce the a text file containing the following:

	     0.000   0.000
	     0.000   0.000
	     0.250   0.000
	     0.500   0.000
	     0.750   0.000
	     1.249   0.170
	     1.499   0.269
	     1.530   0.307
	     1.872   0.263
	     2.056   0.304
	     2.294   0.241
	     2.570   0.216
	     2.761   0.178
	     3.077   0.011
	     3.251   0.001
	     3.500   0.000

       Which shows the time for the peak amplitude within each measured window.

CREDITS

       Author: John ffitch

       1995

AUTHORS

       Barry Vercoe
       MIT Media Lab

	   Author.

       Dan Ellis
       MIT Media Lab,
		 Cambridge
		 Massachussetts

	   Author.

COPYRIGHT

5.10								    08/01/2011								 ENVEXT(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)