The Alternative Csound Reference Manual
Previous |  | Next

# ampdb

ampdb -- Returns the amplitude equivalent of the decibel value x.

## Description

Returns the amplitude equivalent of the decibel value x. Thus:

- 60 dB = 1000

- 66 dB = 1995.262

- 72 dB = 3891.07

- 78 dB = 7943.279

- 84 dB = 15848.926

- 90 dB = 31622.764

## Syntax

ampdb(x) (no rate restriction)

## Examples

Here is an example of the ampdb opcode. It uses the files ampdb.orc and ampdb.sco.

Example 1. Example of the ampdb opcode.

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

    ; Instrument #1.
    instr 1
      idb = 90
      iamp = ampdb(idb)

      print iamp
    endin
    /* ampdb.orc */

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

Its output should include lines like:

    instr 1:  iamp = 31622.764

## See Also

ampdbfs, db, dbamp, dbfsamp

## Credits

Example written by Kevin Conder.

Previous | Home | Next
alpass | Up | ampdbfs