[sdiy] analog pitch shifter circuit?

[harrybissell]

Someone had a pitch shifter schematic using BBDs on their site. iirc it may have

been Osamu Hoshuyama (Hi Osamu :^).    It may have been taken down. It used two
sets of BBD... one is recording while the second is playing back. Not too
complex.

I had one of the parabolic cigarette lighters from Radio Shack... I coupled it
to a pair
of 40KHz transducers and made an auto parking aid (too chikensh!t to say
collision
avoidance) for a manufacturer in the early 80's.  One transducer fired directly
back, the
receiver was in a coaxial configuration facing the parabolic dish.  The readout
inside the
ultra cool 1975 Chevy VEGA wagon could tell the distance in feet to the
target... as long as the
target was not skinny like a fence post.  Chain link fence would register from
more than four
feet (looking like an essential solid) but closer and it would disappear
(presumably the
hole to wire ratio looks worse and worse.

OK I can say it.  I'm a geek and a synth-diy member.

oh yeah, and these BBDs still svck !!!

H^) harry

Scott Stites wrote:

> "The same thing can be done using analog Bucket Brigade Devices (Hi, Harry).
> You need to modulate the BBD clock with a sawtooth wave.  The upward-rising
> (or downward-going for lower pitches) sawtooth wave emulates the effect of
> the
> rotating tape head, effectively raising the pitch of the BBD output by a
> constant amount.  Well, constant until the sawtooth gets to its peak and has
> to
> retrace back to the bottom again...  "
>
> Yup, and I (and probably others on this list) have such a device, though
> it's now in a rather disassembled state (as probably the others owned by
> list members are).  Bought it from Radio Shack back in the late 80's (when
> you could get cool geeky stuff from the Shack).  It's a cassette recorder
> that had two slide pots on it.  One controlled the speed of the tape itself
> and the other controlled the pitch of the playback.  It was designed for
> recording class notes, etc, and upon playback you could slow down or speed
> up the recording while adjusting the pitch so that it didn't sound like a
> chipmunk.  Didn't sound like a chipmunk, but did make the recorded voice
> sound rather like gargling (though still a tad better than modern answering
> machines that have the same feature).  The fun part was you could adjust the
> pitch and playback speed for different pitch/cadence transposition effects.
> I also used to be able to press down the record/play buttons just so and
> have the monitor come out directly when I spoke into the microphone -
> sounded groovy low and gargly.  Last time I looked, I believe it had an
> MN3004 in it.....
>
> Now if I could only find that old Rat Shack parabolic mirror cigarette
> lighter - now *that* was cool......
>
> Cheerio,
> Scott