Stero speaker mixer

Details Stero speaker mixer Stero speaker mixer

1983-05-13

1984-08-28

Pellinen, A. D.

Electrical audio signal processing systems and devices

Switching

381 81, 381 85, H04R 312

Patent

active

044688067

ABSTRACT:
A stereo speaker mixer is disclosed for coupling a plurality of pairs of stereo speakers to the output of an amplifier. A plurality of manually operable selection switches is provided for selecting and coupling in parallel a particular number of speaker pairs. The position of the these switches is detected and decoded by digital logic circuitry which is utilized to couple an appropriate value impedance matching device between the amplifier and the selected number of speaker pairs in response to the actual number of speaker pairs selected. A safety circuit is provided which ensures that at least one pair of speakers is always coupled to the amplifier output without regard to the position of the selection switches, thereby preventing the sudden and unexpected application of amplifier output to a speaker pair.

REFERENCES:
patent: 3370125 (1968-02-01), Shaw et al.
patent: 3694764 (1972-09-01), Barron
patent: 3881058 (1975-04-01), Klauck
patent: 3959736 (1976-05-01), GrosJean
patent: 4004095 (1977-01-01), Cardone
patent: 4176251 (1979-11-01), Odlen et al.

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