via Ray Wilson on The MATRIXSYNTH Lounge:
"If you've been wanting to build a vocoder MFOS has developed one and has PC boards (and soon parts kits) for sale. There are plenty of sound samples to check out."
Check it out on the Music From Outer Space website here.
The intro for the archives:
"Features
Built in White/Pink Noise Source
Built in Square/Pulse Oscillator
Mic/Line Inputs for Control and Audio
Good Dynamic Response To Voice Control
Reasonably Intelligible Speech Processing
Introduction
A vocoder has got to be one of the coolest signal processors going. It allows you to impress vocal harmonic and dynamic characteristics onto other sound sources making them sound as if they are talking. This vocoder design works by using one lo-pass filter (100 Hz.), ten successively tuned band-pass filters (154, 208, 285, 395, 542, 720, 1013, 1495, 2000, 2546 Hz.) and one hi-pass filter (3330 Hz.) to separate the incoming control signal into its harmonic constituents. For each band the control signal appearing at the output of its corresponding filter is full wave rectified and low pass filtered to obtain the control signal's envelope voltage. This signal is used to drive a VCA through which the channel's filtered audio is amplitude controlled. The whole circuit is described below but all I can say is that this thing is totally cool and I'm very happy with mine (I am somewhat biased)."
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