dcblock2
dcblock2 — A DC blocking filter.
Initialization
iorder -- filter order, minimum 4th order, defaults to 128.
iskip -- set to 1 to skip initialization (defaults to 0).
Performance
ares -- filered audio signal
ain -- input audio signal
![[Note]](images/note.png)
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Note |
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Using a value for iorder less that ksmps will not reduce DC offset efficiently. |
Examples
The result can be viewed in a graphical audio editor program like audacity. audacity is available for Linux, Windows, and the MacOS and may be downloaded from http://audacity.sourceforge.net.
Here is an example of the dcblock2 opcode. It uses the file dcblock2.csd, and beats.wav.
Example 173. Example of the dcblock2 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 dcblock2.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> sr = 44100 ksmps = 32 nchnls = 2 instr 1 ;add DC to "beats.wav" asig soundin "beats.wav" asig = asig+5000 ;adds DC of 5000 outs asig, asig endin instr 2 ;dcblock audio asig soundin "beats.wav" asig = asig+5000 ;adds DC adc dcblock2 asig ;remove DC again outs adc, adc endin </CsInstruments> <CsScore> i 1 0 2 i 2 2 2 e </CsScore> </CsoundSynthesizer>