Amplifiers – Sum and difference amplifiers
Patent
1989-03-30
1989-12-12
Mullins, James B.
Amplifiers
Sum and difference amplifiers
330 84, 330124R, 330295, 381 1, H03F 345
Patent
active
048870455
ABSTRACT:
A sum/differential signal processing circuit for use in a sound reproduction system, such as a Dolby surround processing system, includes a pair of operational amplifiers, a resistor connected between the inverting input terminals of the operational amplifiers, two resistors connected between the output terminals of the operational amplifiers, a signal output terminal connected to a junction between the two resistors for producing the sum of output signals from the output terminals of the operational amplifiers. A make switch is connected across one of the two resistors, which is selectively rendered ON and OFF. When the make switch is ON, the sum of output signals of the operational amplifiers is derived from the signal output terminal while when the make switch is OFF, the difference between the output signals thereof is derived therefrom. Even when a monaural signal is applied to each of the two signal input terminals, the signal is not cancelled by the circuit thus arranged.
REFERENCES:
patent: 3992590 (1976-11-01), Takahashi et al.
Mullins James B.
Pioneer Electronic Corporation
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