Remove (most of) DC bias from input signal.

in RTcmix/insts/jg

quick syntax:

DCBLOCK(outsk, insk, dur, AMP)

CAPITALIZED parameters are pfield-enabled for table or dynamic control (see the maketable or makeconnection scorefile commands). Parameters after the [bracket] are optional and default to 0 unless otherwise noted.

Param Field Parameter Units Dynamic Optional Notes
p0 output start time seconds no no  
p1 input start time seconds no no  
p2 duration seconds no no  
p3 amplitude multiplier relative multiplier of input signal yes no  

Parameters labled as Dynamic can receive dynamic updates from a table or real-time control source.

Author: John Gibson , 5/21/06

DCBLOCK uses a simple one-pole/one-zero filter set to remove a DC (0 Hz) offset component in the output signal. The recursive filter equation used for this object is:

where y[n] and y[n-1] are the current and previous outputs of the equation, respectively, and x[n] and x[n-1] are the current and previous sample inputs to the filter equation.

Usage Notes

DCBLOCK processes N input channels to N output channels, e.g. mono to mono, stereo to stereo, quad to quad, etc.

The sound itself should be relatively unchanged by DCBLOCK.

Sample Scores

very basic:

   rtsetparams(44100, 2)


   DCBLOCK(0, 0, DUR(), 1.0)

See Also