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Audio Schematics - Surround Sound Circuits

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 build.

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 Effect

Surround Processor - Simple Surround Processor. This is built with only conventional parts, and digital delay block, too. So it is very easy to build.

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