Patent ID: 8041052

Claim:
An audio selection circuit, comprising: a control/switch circuit having a first input, a second input, and a first output; and a signal detector module configured to detect an audio signal on the second input, wherein if the signal detector detects presence of the audio signal on the second input: the signal detector is configured to transmit a control signal to the control/switch circuit and the control/switch circuit is configured in response to the control signal to disconnect the first input from the first output and to connect the second input to the first output, otherwise: the control/switch circuit is configured to connect the first input to the first output and to disconnect the second input from the first output, wherein the control/switch circuit comprises a non-latching, single-pole, double-throw relay switch having a relay coil, and a first switch section, wherein the first switch section has a first pole connected to a first common terminal, a first first-throw terminal, and a first second-throw terminal, wherein the first common terminal is connected to the first output, wherein the first first-throw terminal is connected to the first input, wherein the first second-throw terminal is connected to the second input, and wherein if the control signal is received by the control/switch circuit: the relay coil is activated, thereby forcing connection of the first pole to the first second-throw terminal, otherwise: the first pole is connected to the first first-throw terminal.