ntrpol

  ir      ntrpol     isig1, isig2, ipoint[, imin, imax]
  kr      ntrpol     ksig1, ksig2, kpoint[, imin, imax]
  ar      ntrpol     asig1, asig2, kpoint[, imin, imax]

Description

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

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.

Author

Gabriel Maldonado
Italy
October, 1998 (New in Csound version 3.49)