The Alternative Csound Reference Manual
Previous |  | Next

# GEN32

GEN32 -- Mixes any waveform, resampled with either FFT or linear interpolation.

## Description

This routine is similar to GEN31, but allows specifying source ftable for each partial. Tables can be resampled either with FFT, or linear interpolation.

## Syntax

f # time size 32 srca pna stra phsa srcb pnb strb phsb ...

## Performance

srca, srcb -- source table number. A negative value can be used to read the table with linear interpolation (by default, the source waveform is transposed and phase shifted using FFT); this is less accurate, but faster, and allows non-integer and negative partial numbers.

pna, pnb, ... -- partial number, must be a positive integer if source table number is positive (i.e. resample with FFT).

stra, strb, ... -- amplitude scale

phsa, phsb, ... -- start phase (0 to 1)

## Examples

    itmp    ftgen 1, 0, 16384, 7, 1, 16384, -1      ; sawtooth
    itmp    ftgen 2, 0, 8192, 10, 1                 ; sine
    ; mix tables
    itmp    ftgen 5, 0, 4096, -32, -2, 1.5, 1.0, 0.25, 1, 2, 0.5, 0,        \
                                    1, 3, -0.25, 0.5
    ; window
    itmp    ftgen 6, 0, 16384, 20, 3, 1
    ; generate band-limited waveforms
    inote   =  0
    loop0:
    icps    =  440 * exp(log(2) * (inote - 69) / 12)        ; one table for
    inumh   =  sr / (2 * icps)                              ; each MIDI note number
    ift     =  int(inote + 256.5)
    itmp    ftgen ift, 0, 4096, -30, 5, 1, inumh
    inote   =  inote + 1
            if (inote < 127.5) igoto loop0

            instr 1

    kcps    expon 20, p3, 16000
    kft     =  int(256.5 + 69 + 12 * log(kcps / 440) / log(2))
    kft     =  (kft > 383 ? 383 : kft)

    a1      phasor kcps
    a1      tableikt a1, kft, 1, 0, 1

            out a1 * 10000

            endin
            instr 2

    kcps    expon 20, p3, 16000
    kft     =  int(256.5 + 69 + 12 * log(kcps / 440) / log(2))
    kft     =  (kft > 383 ? 383 : kft)

    kgdur   limit 10 / kcps, 0.1, 1
    a1      grain2 kcps, 0.02, kgdur, 30, kft, 6, -0.5

            out a1 * 2000

            endin

    ----------
    score:
    ----------

    t 0 60
    i 1 0 10
    i 2 12 10
    e

## Credits

Author: Rasmus Ekman

Programmer: Istvan Varga

New in version 4.17

Previous | Home | Next
GEN31 | Up | GEN33