Electrical audio signal processing systems and devices – Binaural and stereophonic – Broadcast or multiplex stereo
Patent
1981-07-09
1984-08-07
Hickey, R. J.
Electrical audio signal processing systems and devices
Binaural and stereophonic
Broadcast or multiplex stereo
333 28R, 381 18, 381 98, H03H 500
Patent
active
044647816
ABSTRACT:
An equalizer apparatus for audio equipment capable of selecting between a 2-speaker system and a 4-speaker system, including a display device indicating proper operation of the control knobs of the equalizer. The display device includes a first illuminable element of a first color for indicating operation of one channel of stereophonic sound reproduction, a second illuminable element of a second color for indicating operation of the other channel of stereophonically reproduced sound, and color coded means corresponding to said first and second colors for indicating which of the control knobs produce data signals for the first channel and which of the control knobs produce data signals for the second channel. Further, the color coded means may indicate which of the control knobs produce data signals for each of the divided frequencies of the respective channels during operation of the audio equipment in the manner simulating quadriphonic sound.
REFERENCES:
patent: 3397286 (1968-08-01), Prewitt et al.
patent: 4064364 (1977-12-01), Veale
patent: 4107622 (1978-08-01), Toyomaki
patent: 4225834 (1980-09-01), van Doorn
patent: 4276508 (1981-06-01), Usugi
patent: 4292467 (1981-09-01), Odlen et al.
Stereo Catalog 1981, Ziff-Davis Pub. Co.; 1980; p. 220, "JVC SEA-80 Graphic Equalizer"; p. 227, Technics SH8020, Equalizer.
Stereo Catalog 1976, Ziff-Davis Pub. Co.; 1975; p. 103, "Hitachi SMR 7240 4/2 Channel Receiver".
Kajiwara Hitoshi
Kaneko Akio
Alps Electric Co. ,Ltd.
Dunne Gerard F.
Hickey R. J.
Shoup Guy W.
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