Handsfree communication apparatus
First Claim
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1. A handsfree communication apparatus intended to be connected to a wireless telephone set, comprising:
- a plurality of microphones individually provided apart from one another and being spaced apart and positioned with respect to each other for receiving separate speech inputs from different persons for allowing a plurality of persons to take part in simultaneous handsfree communication;
a plurality of amplifiers each for amplifying output signals from said plurality of microphones; and
a speech extraction circuit for receiving output signals from said plurality of amplifiers to cancel out common signal components among the output signals.
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Abstract
A handsfree communication apparatus utilizing a plurality of microphones to allow simultaneous communication by a plurality of persons. The plurality of microphones are separately provided apart from one another. An amplifier section (or a noise canceller) includes a plurality of operational amplifiers for signal amplification individually corresponding to the plurality of microphones, and differential amplifier circuit for executing a differential amplification. Through the differential amplification, simultaneously input noise components are canceled out and reduced, and at the same time speech components are extracted.
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Citations
8 Claims
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1. A handsfree communication apparatus intended to be connected to a wireless telephone set, comprising:
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a plurality of microphones individually provided apart from one another and being spaced apart and positioned with respect to each other for receiving separate speech inputs from different persons for allowing a plurality of persons to take part in simultaneous handsfree communication; a plurality of amplifiers each for amplifying output signals from said plurality of microphones; and a speech extraction circuit for receiving output signals from said plurality of amplifiers to cancel out common signal components among the output signals. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A handsfree communication apparatus intended to be connected to a wireless telephone set installed in a vehicle, said communication apparatus comprising:
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a plurality of microphones individually provided apart from one another and being spaced apart and positioned with respect to each other for receiving separate speech inputs from different persons for allowing a plurality of persons to take part in simultaneous handsfree communication; a plurality of amplifiers each for amplifying output signals from said plurality of microphones; and a speech extraction circuit for inputting output signals from said plurality of amplifiers to cancel out noise components common among the output signals and to extract speech components different among the output signals. - View Dependent Claims (8)
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Specification