MULTI-DIRECTIONAL ANALOG MIXER CIRCUIT AND METHOD

摘要

PURPOSE: A multi-directional analog mixer circuit and its method are provided to simplify an analog mixer circuit and reduce an expense by considerably reducing the number of components of resistances. CONSTITUTION: A plurality of resistances(RL0-RLn) are connected in parallel. A plurality of voice input signals(Lc,L1-Ln) are connected to the plurality of resistances(RL0-RLn). The plurality of resistances(RL0-RLn) which are connected in parallel are connected to an inversion terminal of an operational amplifier(OPi). A resistance(Ri) is connected between an inversion terminal of the operational amplifier(OPi) and an output terminal. A plurality of resistances(RP0-RPn) are connected in parallel to the output terminal of the operational amplifier(OPi). The plurality of resistances(RP0-RPn) are respectively connected to the inversion terminal(-) of the plurality of operational amplifiers(OP0-OPn). A plurality of resistances(RO0-ROn) are connected between the inversion terminal(-)a and the output terminal of the plurality of operational amplifiers(OP0-OPn). A plurality of voice input signals(Lc,L1-Ln) are connected to the plurality of resistances(Rq0-Rqn). The plurality of resistances(Rq0-Rqn) are respectively connected to an inversion terminal(-) of the plurality of operational amplifiers(OP0-OPn).