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tetraphonic
tetraphonic n. 
/ˌtɛtrəˈfəʊnɪk/,
Brit. /ˌtɛtrəˈfɒnɪk/
, /ˌtɛtrəˈfɒnɪk//ˌtɛtrəˈfəʊnɪk/U.S. /ˌtɛtrəˈfɑnɪk/
applied to certain forms of quadraphonic recording and reproduction (see quots.)./ˌtɛtrəˈfɑnɪk/ΘΚΠ
society > communication > record > recording or reproducing sound or visual material > sound recording and reproduction > [adjective] > recorded by specific system
taped1892
phonographed1897
acoustic1926
acoustical1926
stereophonic1927
monaural1931
multitracked1931
binaural1933
multitrack1935
tape-recorded1951
telediphoned1952
stereo1954
multi-taped1955
monophonic1958
pretaped1958
mono1960
audiotaped1962
multichannel1962
quarter-track1962
Dolby1966
quadraphonic1968
tetraphonic1969
periphonic1970
quad1970
quadrasonic1970
Dolbyized1971
QS1972
Dolbyed1973
premix1977
quadro1977
1969 db Dec. 23/2 Microphones are placed so channels 1 and 3, and 2 and 4 will operate as pairs to give three walls of sound... In addition, channels 3 and 4 operate as a stereo pair to sharpen the directionality of the reflected sound... When we discovered this..we called it Tetraphonic Sound.
1974 Wireless World July 236/2 Gerzon's assertion that ‘the optimum characteristic is not known’ in regard to a particular tetraphonic technique could be equally well applied to any quadraphonic system.
1977 Daily Tel. 4 May 18 ‘Tetraphonic’ has already been given the technical meaning of a set of signals giving complete first-order directional information including height.
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