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Last Updated on: Sunday, July 19, 2015 06:24 AM

 

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Allpass Network Shifts Signals 90° -  04/27/95 EDN Design Idea   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.… [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… [Rod Elliott (ESP)]

 

Quadraphonic Amplifier -  This is a four channel amplifier ideally suited for use with quadraphonic equipment such as a Sound Blaster Live card. There is no volume control,audio levels being directly controlled from the sound card itself.… [Andy Collison]

 

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. … [The Electronic Lives Manufacturing-presented by Chan]

 

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… [Rod Elliott (ESP)]

 

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. … [The Electronic Lives Manufacturing-presented by Chan] 

 

Audio Circuits:  Surround Sound Circuits


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