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 49. 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
-odac     ;;;RT audio out
;-iadc    ;;;uncomment -iadc if RT audio input is needed too
; For Non-realtime ouput leave only the line below:
; -o ampdb.wav -W ;;; for file output any platform
</CsOptions>
<CsInstruments>

sr = 44100
ksmps = 32
nchnls = 2

instr 1

idb  =  p4
iamp =  ampdb(idb)
asig	oscil iamp, 220, 1
	print iamp
	outs  asig, asig
endin


</CsInstruments>
<CsScore>
;sine wave.
f 1 0 16384 10 1

i 1 0 1 50
i 1 + 1 90
i 1 + 1 68
i 1 + 1 80

e

</CsScore>
</CsoundSynthesizer>


Its output should include lines like:

      instr 1:  iamp = 316.228
      instr 1:  iamp = 31622.763
      instr 1:  iamp = 2511.886
      instr 1:  iamp = 9999.996
      

See Also

ampdbfs, db, dbamp, dbfsamp