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Allpass Network Shifts Signals 90° - 04/27/95 EDN-Design
Ideas Unlike lowpass, bandpass, and other magnitude-altering
filters, allpass filters can shift the phase of a signal without
affecting its amplitude. For a first-order allpass circuit, the
transfer function is…. [Design Idea by Gary Sellani, Maxim
Integrated Products, Sunnyvale, CA]
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.... (schematic / Circuit design added 9/02)
Quadraphonic Amplifier - This is a four channel amplifier
ideally suited for use with quadraphonic equipment such as a Sound
Blaster Live card. (added 4/02)
Simple Surround Processor - Simple Surround Processor. This is built
with only conventional parts, and digital delay block, too. So it is very easy
to build. (added 6/06)
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....(electronic design
added 6/07)
Surround Processor - Simple Surround Processor. This is built with only
conventional parts, and digital delay block, too. So it is very easy to
build. (added 6/06)
