Manual Reference Pages - CONV (1)
conv - Convolution.
conv [options] signal_file impulse_response_file
The response of a linear filter to an arbitiary input signal is the convolution of the signal with the filters impulse response. The impulse_response_file contains the impulse response which characterises the filter, and the result of the convolution operation is the response of that filter to the signal contained in the signal_file.
The signal_file must consist of binary 16-bit numbers (ie. shorts). The impulse_response_file must consist of binary floats. The output signal is the same length as the input signal and is written on the stdout in binary 16-bit numbers.
If the signal_file consists of an impulse train, then the output should be a repeated impulse response, ie. should be a repeated version of the response_file.
The amount of the signal file to convolve in time units (s or ms) or in samples (no units). Time units are converted to samples using the given samplerate option. The string "max" is recognised as the remainder of input.
Select algorithm for convolution. In the time domain ("domain=time") the discrete convolution formula is applied directly as a local averaging operation on the input signal with weights obtained by time-reversing and shifting the impulse response. The impulse response is assumed to be zero for all time outside the given file. In the frequency domain ("domain=frequency") the FFT of the whole input signal is multiplied by a frequency response function (the FFT of the impulse response), and the result inverse FFTd.
A scale factor for scaling the output.
options smooth fft acf
Copyright (c) Applied Psychology Unit, Medical Research Council, 1995
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|SunOS 5.6||CONV (1)||1 September 1993|