[sdiy] Cheapest good sounding digital reverb?

[ColinMuirDorward]

 I think the application which emulates a choir in a room or the
pipes-placement is a stereo positioning problem.This would require a pretty
sophisticated reverb, no? Richie just said it, but I think the way to do
this would be to have one *nice* reverb with many inputs.
Just speculating here, but I wonder if the mono-reverb/voice algorithm is
quite unnatural, in which case drawing comparisons to acoustic instruments
might be unlikely.
It would be a snap to bash off some prototypes in reactor, PD, etc, but
it's been ten years since I touched any of those!


On Mon, Mar 22, 2021 at 12:42 PM Richie Burnett <
rburnett at richieburnett.co.uk> wrote:

> This is very true.  Most reverbs have just one (mono mix) or two (stereo)
> inputs to the reverb algorithm, whereas in practice every instrument is in
> a
> physically different place within a room.
>
> It's still easier (and much more computationally efficient) to feed
> multiple
> sources into one reverb algorithm in multiple different places than it is
> to
> implement a multitude of separate reverb algorithms in parallel though.
>
> But of course you can't gate the reverb from those multiple different
> sources independently.  Once the energy has been put into the tank it all
> gets mixed together.  The all-pass diffusers do a good job of shuffling it
> around on every pass round the loop!
>
> -Richie,
>
>
>
> -----Original Message-----
> From: Mike Bryant
> Sent: Monday, March 22, 2021 4:26 PM
> To: ColinMuirDorward ; Richie Burnett
> Cc: *SYNTH DIY
> Subject: RE: [sdiy] Cheapest good sounding digital reverb?
>
>
>
> I thought that at first.  One example I can think of is having a choir
> spread around a building such as a cathedral, where the different
> locations
> of the sopranos, altos, tenors and basses, and of any soloists, would
> experience different reverberation, giving a greater sense of the size of
> the building to the overall sound.
>
> Also some of the best church organs were built placing different pipes in
> optimal locations to emphasise certain acoustic properties of the building.
>
>
>
>
>
> From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of
> ColinMuirDorward
> Sent: 22 March 2021 12:53
> To: Richie Burnett
> Cc: *SYNTH DIY
> Subject: Re: [sdiy] Cheapest good sounding digital reverb?
>
>
>
>
>
> Thinking more about this and wondering what would be the sonic difference
> between polyphonic reverb and "paraphonic" reverb.
>
>
>
> Unless each voice is using a different reverb, wouldn't they sound
> identical? A post-reverb VCA will change this, since you can have
> different
> notes gating on and off at different times, but this seems a high price to
> pay for a very subtle effect. Polyphonic effects I would be chasing are
> delay, chorus, flange, pitch, etc; those which could take advantage of
> per-voice dynamic manipulations.
>
>
>
>
>
>
>
> At any rate, I'd love to hear anything that comes out of this, reverb or
> otherwise. There is probably lots to discover in this under-explored
> terrain.
>
>
>
>
>
>
>
> Colin
>
>
>
>
>
>
>
> On Mon, Mar 22, 2021 at 10:47 AM Richie Burnett via Synth-diy
> <synth-diy at synth-diy.org> wrote:
>
>
>
> A few general comments:
>
> 1. High quality reverb requires a decent chunk of MIPS and RAM.
> 2. Convincing small rooms with short reverb times are the hardest to do
> algorithmically.
> 3. Different reverb algorithms needed for different sources.  (More/less
> diffusion for percussive/pad sounds to trade off density & flutter against
> metallic ringing.)
> 4. 16-channels (or 64 !?) is a _LOT_ of data bandwidth.  Use DMA for the
> ADC/DAC/CODEC.
>
> You also need a decent size word-length for the storage and calculations.
> Early 16-bit reverbs were very noisy due to build up of quantisation noise
> within the algorithm due to feedback.  Use at least 20-bit storage or that
> funky floating-point RAM that Keith Barr used for the delay memory.  Or you
> might get away with noisy reverbs if you're gonna put a VCA (noise gate!)
> after it, but there will always be sounds like a deep mellow bass sound
> that
> will reveal "fizzy" quantisation noise because there's no HF content to
> mask
> it.
>
> -Richie,
>
>
> --
> This email has been checked for viruses by AVG.
> https://www.avg.com
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at synth-diy.org
> http://synth-diy.org/mailman/listinfo/synth-diy
> Selling or trading? Use marketplace at synth-diy.org
>
>
>
>
>
> --
>
>
>
> https://www.instagram.com/colinmuirdorward/
>
>
>
> -
>
>
>
>
> https://www.instagram.com/ssdp_synthesis/
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at synth-diy.org
> http://synth-diy.org/mailman/listinfo/synth-diy
> Selling or trading? Use marketplace at synth-diy.org
>


-- 
https://www.instagram.com/colinmuirdorward/
-
<https://www.instagram.com/colinmuirdorward/>
https://www.instagram.com/ssdp_synthesis/
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://synth-diy.org/pipermail/synth-diy/attachments/20210322/dd90c82a/attachment.htm>