Allpass Network Shifts Signals 90° - EDN-Design Ideas
Digital Delay Unit For Surround Sound - The Mitsubishi M65830 Digital Delay
IC has been discontinued (for reasons beyond my comprehension), and so far a
suitable replacement device has not been found. This means (of course) that you
will be unable to build this delay circuit. I have left the project in place as
reference, and the overall connection schematic is still valid if (when?) a
replacement for the M65830 is located. The project will be updated at that time.
In the meantime, just ignore the delay circuit.
Quadraphonic Amplifier - This is a four channel amplifier ideally suited for
use with quadraphonic equipment such as a Sound Blaster Live card.
Simple Surround Processor - Simple Surround Processor. This is built with
only conventional parts, and digital delay block, too. So it is very easy to
Simple Surround Sound Decoder - This surround-sound decoder is based on the
"Hafler" principle, first discovered by David Hafler sometime in the early
1970s. The original idea was to connect a pair of speakers as shown in Figure 1,
for use as the rear speakers in the surround setup.
Surround Processor - Simple Surround Processor. This is built with only
conventional parts, and digital delay block, too. So it is very easy to build.