[sdiy] Frequency shifted from BBD?

[Paulo Constantino]

hi all

On Sat, 5 Oct 2024, 10:20 Gordonjcp, <gordonjcp at gjcp.net> wrote:

> On Fri, Oct 04, 2024 at 06:55:43PM -0700, brianw wrote:
> > Thanks! Very nice to have that Eventide article.
> >
> > One advantage of the H910 is the RAM. The glitch cannot be avoided, but
> it's much shorter. In the H910, the sample rate being written into RAM is
> constant. The sample rate being read out of RAM is also constant, but
> different, so when it wraps around the circular buffer there is a glitch,
> but that glitch only lasts for one sample.
> >
>
> They used a similar technique in the olden days of the 1990s for "radio
> phone-in" delays.
>
> What you used to do was put in a fixed delay of maybe ten seconds. When
> you patched the delay in - it used to be tape but eventually digital took
> over - you dropped a cart the same length as the delay like maybe a station
> ident, and immediately start the introduction to your programme into the
> delay line. By the time the cart was finished the delay had filled up.
>
> In the mid-90s some bright spark realised that you could make ten-second
> digital delays easily with just a few hundred quid's worth of RAM, and if
> you played out ever so slightly slower you could make it "ramp" into a
> ten-second delay. So maybe about 15 minutes before the phone-in programme
> started you'd hit the button on the delay - the time was adjustable - and
> it would slowly delay programme-to-air more and more with an imperceptible
> pitch shift. When you were done, hit the button again, and it'd speed up
> and telescope the delay back in.
>
> I don't think they even bother with that these days. Certainly BBC Radio
> Scotland and BBC Radio 4 don't!
>
> --
> Gordonjcp
>
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