Path: utzoo!attcan!uunet!bu.edu!rpi!uupsi!rodan!ctdonath
From: ctdonath@rodan.acs.syr.edu (Carl T. Donath)
Newsgroups: comp.music
Subject: Frequency shifting
Message-ID: <3956@rodan.acs.syr.edu>
Date: 20 Jul 90 13:03:13 GMT
References: <31841@cup.portal.com> <26311@pasteur.Berkeley.EDU> <31909@cup.portal.com>
Reply-To: ctdonath@rodan.acs.syr.edu (Carl T. Donath)
Organization: Syracuse University, Syracuse, NY
Lines: 33

I just got an interesting spec sheet...

OKI Semiconductor (tel 408-720-1900) sells the "MSM6322 Speech Signal
Pitch Control LSI" chip. To quote part of the sheet:

"General: The MSM6322 converts in realtime the pitch of the speech signal
in a range of one octave upward or downward.
Two pitch control methods can be selected. one is to change the pitch in
17 steps by two switch inputs, and the other is to select one of 16
steps by four binary input lines.
Since a microphone preamplifier and a low pass filter are built in, the 
pitch conversion set can easily be configured by connecting a microphone,
amplifier, and speaker in the peripheral circuit.

"Features:
- Built-in microphone preamp
- Built-in low pass filters (4th order LPF on input and 3rd order on output)
- Built-in 8-bit A/D converter
- Built-in 9-bit D/A converter
- Speech pitch alterable in 17 steps
- Oscillation frequency at 4MHz
- 5v single power supply
- 24-pin plastic flat package
- Silicon construction (Si gate CMOS IC)
Note: designed for application to home electronic equipment (toys)"

There's a couple of application circuits given that are very simple 
to build.

Thought this might be useful to whoever is discussing time/frequency 
shifting...

- Carl