dcblock
dcblock — A DC blocking filter.
Description
Implements the DC blocking filter
Y[i] = X[i] - X[i-1] + (igain * Y[i-1])
Based on work by Perry Cook.
Performance
ain -- audio signal input
![[Note]](images/note.png)
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Note |
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The new dcblock2 opcode is an improved method of removing DC from an audio signal. |
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 dcblock opcode. It uses the file dcblock.csd, and drumsMlp.wav.
Example 209. Example of the dcblock 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 dcblock.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> sr = 44100 ksmps = 32 nchnls = 2 instr 1 ;add DC to "drumsMlp.wav" asig soundin "drumsMlp.wav" asig = asig+5000 ;adds DC of 5000 outs asig, asig endin instr 2 ;dcblock audio asig soundin "drumsMlp.wav" asig = asig+5000 ;adds DC adc dcblock asig ;remove DC again outs adc, adc endin </CsInstruments> <CsScore> i 1 0 2 i 2 2 2 e </CsScore> </CsoundSynthesizer>