[sdiy] Vibrato range

[Richie Burnett]

Have you considered using a DDS chip for your master clock?  These can 
generate frequencies well into the 10's of MHz, programmable to milli-hertz 
resolution, and can be made to change frequency at the drop of a hat without 
any of the "loosing lock" issues of PLLs.

-Richie,


-----Original Message----- 
From: Tim Ressel
Sent: Friday, May 06, 2016 4:30 PM
To: synth-diy at dropmix.xs4all.nl
Subject: Re: [sdiy] Vibrato range



Good point, Roman. I'm planning to use a PLL to drive a pair of clock 
generator chips to create top octave frequencies. The PLL is so that I can 
do vibrato. There is a PLL trick where you sneak in a signal to vary the VCO 
without the PLL losing lock, thus FM-ing the VCO.


Static pitch bend is another issue. The trick of FM-ing a PLL does not work 
for DC. Writing values to the clock chips directly uses I2C and a cumbersome 
calculation and there is 13 outputs to update. I doubt that will be fast 
enough for pitch bend. I am not sure how to implement a clock that is both 
accurate and bendable. Guess I'll have to play.

--TimR




On 5/6/2016 1:02 AM, Roman Sowa wrote:
How about PitchBend? Musicaly usefull vibrato may not have much detune 
range, probably less than +/-50 cents, but the same TOG will also have to 
take care of Pitch Bend, right? Default range is +/-2 semitones, but +/-1 
octave is not uncommon.
BTW, MIDI pitchbend range can be set by RPN message to a level beyond 
sanity.

Roman

W dniu 2016-05-05 o 16:30, Tim Ressel pisze:
Hey all,

I am constantly humbled by how much I do not know, just as I am amazed
and grateful at how helpful you all are. And once again I need a little
help. When doing vibrato -- frequency shift as opposed to time delay -- 
what is a typical range?

Context: I am doing a top octave generator and am at looking at varying
the clock freq to implement vibrato.

Thanks!

-- 
--Tim Ressel
Circuit Abbey
timr at circuitabbey.com



_______________________________________________
Synth-diy mailing list
Synth-diy at dropmix.xs4all.nl
http://dropmix.xs4all.nl/mailman/listinfo/synth-diy

_______________________________________________
Synth-diy mailing list
Synth-diy at dropmix.xs4all.nl
http://dropmix.xs4all.nl/mailman/listinfo/synth-diy


-- --Tim Ressel Circuit Abbey timr at circuitabbey.com





_______________________________________________
Synth-diy mailing list
Synth-diy at dropmix.xs4all.nl
http://dropmix.xs4all.nl/mailman/listinfo/synth-diy








No virus found in this message.
Checked by AVG - www.avg.com
Version: 2016.0.7596 / Virus Database: 4565/12174 - Release Date: 05/06/16