db

db
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db — Returns the amplitude equivalent for a given decibel amount.

Description

Returns the amplitude equivalent for a given decibel amount. This opcode is the same as ampdb.

Syntax

db(x)

This function works at a-rate, i-rate, and k-rate.

Initialization

x -- a value expressed in decibels.

Performance

Returns the amplitude for a given decibel amount.

Examples

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

Example 99. Example of the db 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 db.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
  ; Calculate the amplitude of 40 decibels.
  idecibels = 40
  iamp = db(idecibels)

  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 = 100.000

Credits

Example written by Kevin Conder.

New in version 4.16

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