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 50. 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