[sdiy] FSK specifications

[cyborgzero at comcast.net]

Check this out:

http://tritium.fis.unb.br/Fis3Exp/www.tmo.hp.com/tmo/pia/BasicInstrume
nt/TUTnBRIEF/English/BI-B-33120A-040.html

Anyway, all it is is a switching between one frequency and another to
send data.

Now, for audio, I don't quite know how that would work other than that
they would prlly output one frequency for do nothing, and another for
*clock*. That would make sense.

You can decode this using 1 filter actually, that looks for a
particular frequency and outputs a pulse, then you could pump that
into a digital counter, tap off of the appropriate number and loop
that back into the reset of the counter to get your divisions.

Crude, but effective.. IIRC a 4017 counter will do this.

Rob

----- Original Message -----
From: "Scott Juskiw" <scott at tellun.com>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Wednesday, March 20, 2002 12:55 PM
Subject: Re: [sdiy] FSK specifications


> You're thinking about the PAIA 6770 Master Synchronizer designed by
> Craig Anderton (found in Jan/Feb 1983 issues of Keyboard). I still
> have one of these in my junk box. It doesn't use FSK, unfortunately,
> it uses a pulse train.
>
> At 8:29 AM -0800 2002/03/20, greg montalbano wrote:
> >I have a vague memory of a Craig Anderton/PAIA kit something along
> >those lines...
> >can't find any record of it in my office mess here.
> >Anybody else?
> >
> >At 09:52 AM 3/20/02 -0500, Dave wrote:
> >>Hi everyone,
> >>
> >>I just had a silly idea that may or may not work.  I was wondering
if it
> >>would be possible to use clock dividers to derive 1/4 1/8 and 1/16
notes
> >>from the FSK output of my sequencer.
> >>
> >>>From my understanding, FSK is simply a pulse wave clock, right?
How many
> >>ppqn will it generally have?  I just figure this may be an easy
way to
> >>"cheat" and avoid using my DIN-Sync convreter to feed my clock
dividers.
> >>
> >>Any ideas?  Googling didn't turn up any good links to the FSK
signal specs.
> >>  Note that I have regular FSK not "smart FSK" or SMPTE.
> >>
> >>Thanks in advance
> >>
> >>Dave Magnuson
> >>
> >>Resonant Frequency:
> >>resfreq at hoohahrecords.com
> >>http://www.hoohahrecords.com/resfreq/index.html
>