Hafler circuit - Wikipedia
WEBThe Hafler circuit is a passive electronics circuit with the aim of getting derived surround sound or ambiophony from regular stereo recordings without using costly electronics. Such circuits are generally known as matrix decoders .
Simple Surround Sound Decoder
WEBThis 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.
Matrix decoder - Wikipedia
WEBMatrix decoding is an audio technology where a small number of discrete audio channels (e.g., 2) are decoded into a larger number of channels on play back (e.g., 5). The channels are generally, but not always, arranged for transmission or recording by an encoder, and decoded for playback by a decoder. The function is to allow multichannel audio ...
Quadraphonic sound - Wikipedia
WEBMany quadraphonic recordings in the 1970s used "matrix" technologies to encode and decode four channels of audio information in a 2-channel medium, usually an LP. The poor decoding performance of early matrix formats was the main reason they disappeared once improved matrix systems arrived.
Simple Surround Sound Decoder Circuit - Homemade Circuit …
WEBMar 3, 2020 · The concept of the decoder was first introduced by David Hafler in the 70s. His research illustrates the way to use two speakers as rear speakers on a surround system. The figure below is a diagram based on Hafler’s research:
Are any of the surround sound formats basically a Hafler circuit?
WEBNov 27, 2016 · With cheap processing power and advanced technology, Hafler's passive matrix has become an active matrix. But it all is derived from 2-channel recordings that have additional info... and how well... or how poorly... that info is acquired determines the format's success.
Stereo to 5.1 hafler matrix decoder - diyAudio
WEBJan 15, 2006 · Hey guys, you may have seen that I was working on a veroboard version of Rod Elliot's hafler matrix circuit... I completed the prototype yesterday. I have so far tested the Subwoofer output, and the main Left and right, (the missus is watching a movie now, so I can only test the rest later).
History of Surround Sound Processing: The Battle for Dolby …
WEBDec 10, 2022 · Dolby Surround was a passive matrix, like the Hafler circuit, and it placed ambient mono information in either one or two rear speakers. (Dolby Stereo was a crude active matrix pro surround technology used in theaters.)
Poor Man's Surround Sound, A.K.A., the Hafler Circuit
WEBMar 23, 2016 · Wiring incorrectly, especially using the wrong diagram for your type of amplifier, could damage your amplifier. First, check to see if your amplifier has a common-ground; the answer here will determine which circuit diagram you can use. Then, do an online search for “Hafler Circuit”.
Surround Sound for Free (it Could Save Your Marriage!) - Instructables
WEBSurround Sound for Free (it Could Save Your Marriage!) If you've got four speakers and don't want to lash out on a new surround sound system (or 'er indoors refuses to have any more AV equipment in her living room!), try this Hafler circuit.