ampdb
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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 file ampdb.csd.

Example 33. Example of the ampdb 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
; Audio out   Audio in
-odac           -iadc    ;;;RT audio I/O
; For Non-realtime ouput leave only the line below:
; -o ampdb.wav -W ;;; for file output any platform
</CsOptions>
<CsInstruments>

; Initialize the global variables.
sr = 44100
kr = 4410
ksmps = 10
nchnls = 1

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

  print iamp
endin


</CsInstruments>
<CsScore>

; Play Instrument #1 for one second.
i 1 0 1
e


</CsScore>
</CsoundSynthesizer>


Its output should include lines like: 

instr 1:  iamp = 31622.764

See Also

ampdbfs, db, dbamp, dbfsamp

Credits

Example written by Kevin Conder.

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