Patent ID: 6925184

Claim:
An audio processor for converting a two-channel audio system into a multichannel audio system, comprising an operational amplifier, wherein: one channel of the two-channel audio system is inputted into a “+” terminal of the operational amplifier through a voltage divider, another channel of the two-channel audio system is inputted into a “−” terminal of the operational amplifier through a switch and a resistor R 3 , an output of the operational amplifier is fed back to the “−” terminal of the operational amplifier through a resistor R 4 , said switch is used to control the inputting of said another channel, and said voltage divider comprises a resistor R 1 and a resistor R 2 , one channel of the two-channel audio system is input into said voltage divider, a connecting point between said resistor R 1 and said resistor R 2 acts as an output of said voltage divider, the resistors having a relation R 1 =R 4 and R 2 =R 3 to ensure that the audio input into said “+” terminal of the operational amplifier is not influenced by said switch.