[sdiy] sync'ing BBD delays

[Colin Fraser]

> -----Original Message-----
> From: owner-synth-diy at node12b53.a2000.nl
> [mailto:owner-synth-diy at node12b53.a2000.nl]On Behalf Of
> jhaible at t-online.de
> Sent: 11 May 2001 15:52
> To: synth-diy at node12b53.a2000.nl
> Subject: [sdiy] sync'ing BBD delays
>
>
> Just a thought:
> Did anybody try to sync an analog (BBD) echo to a midi
> or other BPM clock ?

I've thought about it a lot, but still not tried anything out - too many
other projects on the go at once...
I did get round to buying a second-hand EH Memroy man to experiment on.

My first idea was the same as yours - a PLL with divider to multiply the DIN
clock up to delay clock.
Second idea is a CPU based oscillator controller that would time incoming
clock pulses and intelligently control the hf delay clock osc.
This would be able to detect if the clock had stopped (period greater than a
lower tempo limit), and allow the delay time to 'freewheel' at the last
known clock rate.
Third option is by far the easiest - extract the clock from the delay unit,
divide it down, and use it as your master tempo clock.
A choice of divider ratios would allow you to vary the delay for different
note lengths at any given tempo.

Colin f