Patent ID: 7317804
Filing Date: 2008-01-08
Classification: G10H,H04R

Abstract:
1. A sound collecting device comprising: a housing; a sound collecting unit disposed within said housing; a transducer, installed in said sound collecting unit, which receives both a sound wave and an electromagnetic wave and produces a composite signal denoting a mixture of the sound signal and the electromagnetic wave; an electromagnetic sensor, installed in said housing adjacent to said sound collecting unit, which receives the electromagnetic wave to produce an electromagnetic signal denoting the electromagnetic wave; a sensor amplifier which amplifies the electromagnetic signal produced by said electromagnetic sensor; a transducer vibrating circuit, connected to said transducer in parallel to said sensor amplifier, which vibrates said transducer; a sensor vibrating circuit, connected to said electromagnetic sensor in parallel to said sensor amplifier, which vibrates said electromagnetic sensor; and an output circuit which subtracts the electromagnetic signal produced by said electromagnetic sensor from the composite signal produced by said transducer to produce an acoustic signal corresponding to the sound signal.