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Patent

Voice signal input system

Kametani Jun
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TLDR
In this paper, a two-dimensional microphone array is provided with the array arranged so as to collect a voice input signal at maximum from a virtual point sound source and a mixer circuit 2 for adding input signals from the array 1.
Abstract: 
PURPOSE:To emphasize only a voice signal generated from a speaker and to suppress other unnecessary noise signals by arranging respective microphones in a two-dimensional microphone array so that speaker's voice can be collected at maximum. CONSTITUTION:This voice signal input system is provided with the two-dimensional microphone array 1 arranged so as to collect a voice input signal at maximum from a virtual point sound source and a mixer circuit 2 for adding input signals from the array 1. When a sound wave arrives at the array 1, three signals inputted to the mixer 2 are emphasized by the addition of a same phase signal and the emphasized signal is outputted to a microphone amplifier part 3. When the three signals having respectively different phases are inputted to the mixer 2 and added, the added signal whose amplitude is reduced is outputted to the amplifier part 3. Since only a necessary speaker's voice can be selectively emphasized, other unnecessary noise components can be suppressed.

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