The Alternative Csound Reference Manual
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# lpfreson

lpfreson -- Modifies the spectrum of an audio signal with time-varying filter coefficients from a control file and frequncy ratio.

## Description

Modifies the spectrum of an audio signal with time-varying filter coefficients from a control file and frequncy ratio.

## Syntax

ar lpfreson asig, kfrqratio

## Performance

asig -- an audio signal to be modified.

kfrqratio -- frequency ratio. Must be greater than 0.

lpread gets its values from the control file according to the input value ktimpnt (in seconds). If ktimpnt proceeds at the analysis rate, time-normal synthesis will result; proceeding at a faster, slower, or variable rate will result in time-warped synthesis. At each k-period, lpread interpolates between adjacent frames to more accurately determine the parameter values (presented as output) and the filter coefficient settings (passed internally to a subsequent lpfreson).

## See Also

lpread, lpreson

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