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# ntrpol

ntrpol -- Calculates the weighted mean value of two input signals.

## Description

Calculates the weighted mean value (i.e. linear interpolation) of two input signals

## Syntax

ar ntrpol asig1, asig2, kpoint [, imin] [, imax]

ir ntrpol isig1, isig2, ipoint [, imin] [, imax]

kr ntrpol ksig1, ksig2, kpoint [, imin] [, imax]

## Initialization

imin -- minimum xpoint value (optional, default 0)

imax -- maximum xpoint value (optional, default 1)

## Performance

xsig1, xsig2 -- input signals

xpoint -- interpolation point between the two values

ntrpol opcode outputs the linear interpolation between two input values. xpoint is the distance of evaluation point from the first value. With the default values of imin and imax, (0 and 1) a zero value indicates no distance from the first value and the maximum distance from the second one. With a 0.5 value, ntrpol will output the mean value of the two inputs, indicating the exact half point between xsig1 and xsig2. A 1 value indicates the maximum distance from the first value and no distance from the second one. The range of xpoint can be also defined with imin and imax to make its management easier.

These opcodes are useful for crossfading two signals.

## Credits

Author: Gabriel Maldonado
Italy
October 1998

New in Csound version 3.49

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