Time Compressor:
Lexicon Model 2400 Stereo Time Compressor/Expander

Real-time pitch processor from the 2400 (the Confidence board)

Electronic Apparatus for Modification of Time Duration or Pitch of Music and Speech

Using Digital Signal Processor Chips in a Stereo Audio Time Compressor/Expander

Hearing Aid:
Inverse Fitting

Effects Processor:
Ensoniq DP4

Digital signal processor for audio applications (ESP2 chip patent)

DP4 Manual (English)

DP4 Manual (German)

ESP2 Chip

ESP2 Chip Microcode

FIR Digital Filter:
Analog Devices A/D 1878/1879

Decimation filter as for a sigma-delta analog-to-digital converter (patent)

Implementation of Digital Filters for High-Fidelity Audio,
from
AUDIO IN DIGITAL TIMES, 7th INTERNATIONAL CONFERENCE of the AUDIO ENGINEERING SOCIETY
Part II - One-Stage Multirate 64:1 FIR Decimator for a One-Bit Sigma-Delta A/D (.pdf)