ampdb — Returns the amplitude equivalent of the decibel value x.
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
Here is an example of the ampdb opcode. It uses the file ampdb.csd.
Example 31. 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