Re: opcodes

From: John Lazzaro (lazzaro@CS.Berkeley.EDU)
Date: Tue Jan 25 2000 - 12:59:40 EST


[ Marek writes ]

>> I want to know if there are any reverb(), flange() and chorus() opcodes

[ Eric writes ]

> If anyone wants to write these, I'm happy to integrate
> the code. It shouldn't be very hard.

If anyone's inspired to do this but isn't familiar with
the algorithms involved, I suggest:

http://www.harmony-central.com/Effects/Articles/Flanging/
http://www.harmony-central.com/Effects/Articles/Chorus/
http://www.harmony-central.com/Effects/Articles/Reverb/

as a good primer.

Also, one point in 5.9.14 about chorus and flange which may
be open to some implementer interpetation -- the depth
parameter is described as "percent excursion". Sfront
currently interpets this number literally as a percent
between 0% and 100%, i.e. this call:

flange(input[0],0.1,25)

implies a 25% depth. Is this the coding that was intended
in the standard, or is an encoding between 0.00 and 1.00
intended?

                                                --john lazzaro

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John Lazzaro -- Research Specialist -- CS Division -- EECS -- UC Berkeley
lazzaro [at] cs [dot] berkeley [dot] edu www.cs.berkeley.edu/~lazzaro
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