[sdiy] Buchla 295 10-band comb filter topology

[Mike Bryant]

Until the TRW multipliers came along it was always a case of bending the filter coefficients to minimize the number of shift/add/subtracts you needed.  With that and some creative decimation you could manage quite a lot with a 9 MHz clock speed.
________________________________
From: Donald Tillman <don at till.com>
Sent: 22 November 2022 19:50
To: Guy McCusker <guy.mccusker at gmail.com>
Cc: Mike Bryant <mbryant at futurehorizons.com>; mark verbos <mark at verboselectronics.com>; synth-diy at synth-diy.org <synth-diy at synth-diy.org>
Subject: Re: [sdiy] Buchla 295 10-band comb filter topology

> On Nov 22, 2022, at 3:46 AM, Guy McCusker via Synth-diy <synth-diy at synth-diy.org> wrote:
>
> Would a workable digital implementation have been possible in 1978? I
> always assume the answer is no but one can be surprised.

The answer is always: "How fast would you need to do a 16x16 multiply and accumulate operation?"

  -- Don
--
Donald Tillman, Palo Alto, California
https://www.till.com`
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