REV()

REV

Several basic reverberators.

in RTcmix/insts/jg

quick syntax:

REV(outsk, insk, dur, AMP, rvbtype, rvbtime, RVBAMT[, inputchan])

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	input duration	seconds	no	no
p3	amplitude multiplier	relative multiplier of input signal	yes	no
p4	reverb type	integer - 1: PRCRev, 2: JCRev, 3: NRev	no	no	see Usage Notes below
p5	reverb time	seconds	no	no
p6	reverb amount	0: dry –> 1: wet	yes	no
p7	input channel	-	no	yes	default: 0

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

Author: John Gibson, 7/19/99; rev for v4, 7/21/04 based on several reverberators from the STK package (by Perry Cook, Gary Scavone, and Tim Stilson)

REV processes input audio through a choice of three different reverb types (all from CCRMA st Stanford University).

Usage Notes

The reverberators in REV all have characteristic ‘sounds’, for more general reverberation the FREEVERB or GVERB instruments are probably better. There are also a number of excellent room-simulator instruments (listed under the See Also section below). The REV algorithms are very efficient, though.

The reverb types are:

     (1) PRCRev (Perry R. Cook)
           2 allpass units in series followed by 2 comb filters in parallel.

     (2) JCRev (John Chowning)
           3 allpass filters in series, followed by 4 comb filters in
           parallel, a lowpass filter, and two decorrelation delay lines
           in parallel at the output.

     (3) NRev (Michael McNabb)
           6 comb filters in parallel, followed by 3 allpass filters, a
           lowpass filter, and another allpass in series, followed by 2
           allpass filters in parallel with corresponding right and left
           outputs.

REV can produce either mono or stereo output.

Sample Scores

very basic:

   rtsetparams(44100, 2)
   load("REV")
   
   rtinput("mysound.aif")

   outskip = 0
   inskip = 0
   dur = DUR()
   amp = 0.7
   rvbtype = 3
   rvbtime = 0.3
   rvbpct = 0.3
   inchan = 0

   ampenv = maketable("line", 1000, 0,0, 1,1, dur-1,1, dur,0)

   REV(outskip, inskip, dur, amp*ampenv, rvbtype, rvbtime, rvbpct, inchan)