dbfsamp

Returns the decibel equivalent of the raw amplitude x, relative to full scale amplitude.

Full scale is set by 0dbfs. With 0dbfs = 1, dbfsamp(1) returns 0 dB and dbfsamp(0.1) returns -20 dB.

New in Csound version 4.10.

Syntax

dbfsamp(x)  (init-rate or control-rate args only)

Examples

Here is an example of the dbfsamp opcode. It uses the file dbfsamp.csd.

<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 dbfsamp.wav -W ;;; for file output any platform
</CsOptions>
<CsInstruments>

sr = 44100
ksmps = 32
nchnls = 2
0dbfs = 1

instr 1

iamp = p4
idb  = dbfsamp(iamp)
     print idb
asig vco2 iamp, 110     ;sawtooth
     outs asig, asig

endin

</CsInstruments>
<CsScore>

i 1 0 1 0.0000305
i 1 + 1 0.0031
i 1 + 1 0.03
i 1 + 1 0.3
i 1 + 1 0.9
e

</CsScore>
</CsoundSynthesizer>

Its output should include lines like this:

instr 1:  idb = -90.309
instr 1:  idb = -50.309
instr 1:  idb = -30.309
instr 1:  idb = -10.309
instr 1:  idb = -0.767

See also

Amplitude Converters