Sound collecting device minimizing electrical noise
First Claim
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.
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Accused Products
Abstract
A sound collecting device is provided which is designed to minimize adverse effects on an output caused by exposure of an electroacoustic transducer to the air. The device includes an electroacoustic transducer and a vibrating circuit. The transducer is exposed to the air and responsive to input of a sound wave to produce a corresponding acoustic signal. The vibrating circuit vibrates the transducer to shake foreign substances such as dust or drops of water from the transducer. In a modified form, an electromagnetic sensor is provided which measures an electromagnetic noise transmitted to the transducer and which removes the electromagnetic noise from an output of the transducer to produce a noiseless acoustic signal.
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Citations
8 Claims
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1. A sound collecting device comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification