vco2ift
Prev | Orchestra Opcodes and Operators | Next

## vco2ift

vco2ift — Returns a table number at i-time for a given oscillator frequency and wavform.

## Description

vco2ift is the same as vco2ft, but works at i-time. It is suitable for use with opcodes that expect an i-rate table number (for example, oscili).

## Syntax

    ifn vco2ift icps, iwave [, inyx]

## Initialization

ifn -- the ftable number.

icps -- frequency in Hz. Zero and negative values are allowed. However, if the absolute value exceeds sr/2 (or sr * inyx), the selected table will contain silence.

iwave -- the waveform for which table number is to be selected. Allowed values are:

- 0: sawtooth

- 1: 4 * x * (1 - x) (integrated sawtooth)

- 2: pulse (not normalized)

- 3: square wave

- 4: triangle

Additionally, negative iwave values select user defined waveforms (see also vco2init).

inyx (optional, default=0.5) -- bandwidth of the generated waveform, as percentage (0 to 1) of the sample rate. The expected range is 0 to 0.5 (i.e. up to sr/2), other values are limited to the allowed range.

Setting inyx to 0.25 (sr/4), or 0.3333 (sr/3) can produce a “fatter” sound in some cases, although it is more likely to reduce quality.

## Examples

Here is an example of the vco2ift opcode. It uses the file vco2ift.csd.

Example 884. Example of the vco2ift opcode.

See the sections Real-time Audio and Command Line Flags for more information on using command line flags.

    <CsoundSynthesizer>
    <CsOptions>
    ; Select audio/midi flags here according to platform
    -odac  ;;;realtime audio out
    ;-iadc    ;;;uncomment -iadc if realtime audio input is needed too
    ; For Non-realtime ouput leave only the line below:
    ; -o vco2ift.wav -W ;;; for file output any platform
    </CsOptions>
    <CsInstruments>

    sr = 44100
    ksmps = 32
    nchnls = 2
    0dbfs  = 1

    ; user defined waveform -2: fixed table size (64), number of partials
    ; multiplier is 1.4
    itmp    ftgen 2, 0, 64, 5, 1, 2, 120, 60, 1, 1, 0.001, 1
    ift     vco2init -2, 2, 1.4, 4096, 4096, 2

    instr 1

    icps = p4
    ifn  vco2ift icps, -2, 0.5	;with user defined waveform
    print ifn
    asig oscili 1, 220, ifn		; (-2), and sr/2 bandwidth
         outs asig, asig

    endin
    </CsInstruments>
    <CsScore>

    i 1 0 2 20
    i 1 3 2 2000
    i 1 6 2 20000

    e
    </CsScore>
    </CsoundSynthesizer>

Its output should include a line like these:

    instr 1:  ifn = 22.000
    instr 1:  ifn = 8.000
    instr 1:  ifn = 3.000

See the example for the vco2 opcode too.

## See Also

vco2ft, vco2init, and vco2.

## Credits

Author: Istvan Varga

New in version 4.22

Prev | Up | Next
vco2ft | Home | vco2init