The Alternative Csound Reference Manual
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# 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 files cent.orc and cent.sco.

Example 1. Example of the cent opcode.

    /* cent.orc */
    ; Initialize the global variables.
    sr = 44100
    kr = 4410
    ksmps = 10
    nchnls = 1

    ; Instrument #1.
    instr 1
      ; The root note is A above middle-C (440 Hz)
      iroot = 440

      ; Raise the root note by 300 cents to C.
      icents = 300

      ; Calculate the new note.
      ifactor = cent(icents)
      inew = iroot * ifactor

      ; Print out of all of the values.
      print iroot
      print ifactor
      print inew
    endin
    /* cent.orc */

    /* cent.sco */
    ; Play Instrument #1 for one second.
    i 1 0 1
    e
    /* cent.sco */

Its output should include lines like:

    instr 1:  iroot = 440.000
    instr 1:  ifactor = 1.189
    instr 1:  inew = 523.229

## See Also

db, octave, semitone

## Credits

Example written by Kevin Conder.

New in version 4.16

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