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envext(1) [linux man page]

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

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
5.07 06/23/2009 ENVEXT(1)

Check Out this Related Man Page

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

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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