cent
Prev | Orchestra Opcodes and Operators | Next

## cent

cent — Calculates a factor to raise/lower a frequency by a given amount of cents.

## Description

Calculates a factor to raise/lower a frequency by a given amount of cents.

## Syntax

    cent(x)

This function works at a-rate, i-rate, and k-rate.

## Initialization

x -- a value expressed in cents.

## Performance

The value returned by the cent function is a factor. You can multiply a frequency by this factor to raise/lower it by the given amount of cents.

## Examples

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

Example 108. Example of the cent 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     ;;;RT audio out
    ;-iadc    ;;;uncomment -iadc if RT audio input is needed too
    ; For Non-realtime ouput leave only the line below:
    ; -o cent.wav -W ;;; for file output any platform
    </CsOptions>
    <CsInstruments>

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

    instr 1	; original pitch

    iroot = 440	; root note = A (440 Hz)

    print iroot	;print out

    asig oscili 0.6, iroot, 1
         outs asig, asig

    endin

    instr 2

    iroot   = 440	; root note = A (440 Hz)
    icents  = p4	; change root note by 300 and 1200 cents

    ifactor = cent(icents) ; calculate new note
    inew    = iroot * ifactor

    print iroot	; Print all
    print ifactor
    print inew

    asig oscili 0.6, inew, 1
         outs asig, asig

    endin

    </CsInstruments>
    <CsScore>
    ; sine wave
    f1 0 32768 10 1

    i 1 0  2  0	;no change
    i 2 2.5 2 300	;note = C above A
    i 2 5  2 1200	;1 octave higher

    e

    </CsScore>
    </CsoundSynthesizer>

Its output should include lines like:

    instr 1:  iroot = 440.000

    instr 2:  iroot = 440.000
    instr 2:  ifactor = 1.189
    instr 2:  inew = 523.251

    instr 2:  iroot = 440.000
    instr 2:  ifactor = 2.000
    instr 2:  inew = 880.000

## See Also

db, octave, semitone

New in version 4.16

Prev | Up | Next
cell | Home | centroid