Effects Processor:
Ensoniq DP4
Digital signal
processor for audio applications (ESP2 chip patent)
DP4 Manual (English) / (German)
ESP2 Chip
Ensoniq DP4+ Schematics
Ensoniq Parallel Effects Processor DP4 demo
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
Lexicon 2400 Stereo Audio Time Compressor/Expander Service Manual
Hearing Aid:
Inverse Fit by graphic equalizer
Projection on fit-bounded polyhedral cone sans linear programming
earO hearing test
discrimination test
FIR Digital Filter:
Analog Devices A/D 1878/1879 ΣΔ converter
High Performance 16-/18-Bit ΣΔ Stereo ADCs
Analog Devices Application Note: Sigma-Delta ADCs & DACs
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 AES
Part II - One-Stage Multirate 64:1 FIR Decimator for 1-Bit ΣΔ A/D
Laptop Supercomputer: