dcblock
Prev  Orchestra Opcodes and Operators  Next

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.

Syntax

ares dcblock ain [, igain]

Initialization

igain -- the gain of the filter, which defaults to 0.99

Performance

ain -- audio signal input

Examples

Here is an example of the dcblock opcode. It uses the file dcblock.csd, and beats.wav.

Example 102. 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
; Audio out   Audio in    No messages
-odac           -iadc     -d     ;;;RT audio I/O
; For Non-realtime ouput leave only the line below:
; -o dcblock.wav -W ;;; for file output any platform
</CsOptions>
<CsInstruments>

; Initialize the global variables.
sr = 44100
kr = 4410
ksmps = 10
nchnls = 1

; Instrument #1 -- normal audio signal.
instr 1
  asig soundin "beats.wav"
  out asig
endin

; Instrument #2 -- dcblock-ed audio signal.
instr 2
  asig soundin "beats.wav"

  igain = 0.75
  a1 dcblock asig, igain

  out a1
endin


</CsInstruments>
<CsScore>

; Play Instrument #1 for 2 seconds.
i 1 0 2
; Play Instrument #2 for 2 seconds.
i 2 2 2
e


</CsScore>
</CsoundSynthesizer>


Credits

Author: John ffitch
University of Bath, Codemist Ltd.
Bath, UK

Example written by Kevin Conder.

New in Csound version 3.49

February 2003: Thanks to a note from Anders Andersson, corrected the formula.

Prev  Up  Next
dbfsamp  Home  dconv