MICROPHONE WITH INFRARED ON/OFF SWITCH

摘要

A microphone including an infrared switch circuit is disclosed. The infrared switch circuit includes an infrared detector for detecting a reflection of an infrared signal off an object such as a human body, and producing an electrical signal. The circuit also includes an amplifier for amplifying the electrical signal and a comparator for determining if the amplified electrical signal is above a predetermined threshold. The switching finally includes a audio switching network for providing the amplified signal as an audio signal if the amplified signal is above a predetermined threshold. The circuit also includes power conservation techniques to improve performance.