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Stereo-4, also known as EV (from Electro-Voice) or EV-4, was a matrix 4-channel quadraphonic sound system developed in 1970 by Leonard Feldman and Jon Fixler. [ 1 ] The system was heavily promoted by RadioShack stores in the United States, and some record companies released LP albums encoded in this format.
The CD-4 record track is broader than a conventional stereo track, so the playing time is less than a conventional stereo record. The audio frequencies (20 Hz to 15 kHz), often referred to as the sum channel , would contain the sum of the left front plus left back signals in the left channel and the sum of the right front plus the right back ...
Matrix 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.
A four channel quadraphonic diagram showing the usual placement of speakers around the listener. Quadraphonic (or quadrophonic, also called quadrasonic or by the neologism quadio [1] [formed by analogy with "stereo"]) sound – equivalent to what is now called 4.0 surround sound – uses four audio channels in which speakers are positioned at the four corners of a listening space.
SQ is compatible with two-channel stereo, but there are some problems. The front channels are totally compatible, the rear channels have a smaller width. But the great problems are the sounds between front and rear. They will turn to the left and the middle point of the room goes only to the left speaker in 2-channel stereo.
4-Track (Muntz Stereo-Pak) Analog, 1 ⁄ 4-inch-wide (6.4 mm) tape, 3 + 3 ⁄ 4 in/s, endless-loop cartridge 1962 Compact cassette: Variants of the Compact Cassette Analog, with bias. 0.15 inches (3.81 mm) tape, 1 + 7 ⁄ 8 ips. 1970: introduced Dolby noise reduction: 1964 Sanyo Micro Pack 35 Channel Master 6546 Westinghouse H29R1
The computer program pdfTeX is an extension of Knuth's typesetting program TeX, and was originally written and developed into a publicly usable product by Hàn Thế Thành as a part of the work for his PhD thesis at the Faculty of Informatics, Masaryk University, Brno, Czech Republic.
LuaTeX is a TeX-based computer typesetting system which started as a version of pdfTeX with a Lua scripting engine embedded. After some experiments it was adopted by the TeX Live distribution as a successor to pdfTeX (itself an extension of ε-TeX, which generates PDFs).