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Noise reduction apparatus, audio input apparatus, wireless communication apparatus, and noise reduction method

A noise reduction and sound direction technology, applied in the field of noise reduction devices, can solve problems such as signal sound pressure level drop

Active Publication Date: 2013-08-21
JVC KENWOOD CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If audio components are mixed into the reference signal in this way, the audio components contained in the audio signal are also eliminated when the noise reduction processing is performed, and there is a problem that the sound pressure level of the signal after the noise reduction processing decreases.

Method used

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  • Noise reduction apparatus, audio input apparatus, wireless communication apparatus, and noise reduction method
  • Noise reduction apparatus, audio input apparatus, wireless communication apparatus, and noise reduction method
  • Noise reduction apparatus, audio input apparatus, wireless communication apparatus, and noise reduction method

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Embodiment Construction

[0040] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0041] figure 1 It is a block diagram showing the noise reduction device of the embodiment. Such as figure 1 As shown, the noise reduction device 1 of the present embodiment includes a sound interval determination unit 11 , a sound direction determination unit 12 , and a noise reduction processing unit 13 . The noise reduction processing unit 13 includes an adaptive filter 14 , an adaptive coefficient adjustment unit 15 , a noise reduction amount adjustment unit 16 , and adders 17 and 18 .

[0042] The noise reduction device 1 of the present embodiment receives a first sound pickup signal (sound signal) 21 mainly including a sound component and a second sound pickup signal (reference signal) 22 mainly including a noise component, and utilizes the sound pickup signal 21 and the sound pickup signal 22 performs noise reduction processing, and outputs the signal after th...

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Abstract

A speech segment of a voice sound is detected based on a first sound pick-up signal obtained based on the voice sound. A voice incoming direction of the voice sound is determined using the first sound pick-up signal and a second sound pick-up signal obtained based on a picked-up sound. A noise reduction process is performed to reduce a noise component carried by the first sound pick-up signal by using the second sound pick-up signal, wherein a noise reduction amount adjusted in accordance with the voice incoming direction is used in the noise reduction process.

Description

technical field [0001] The present invention relates to a noise reduction device, a sound input device, a wireless communication device and a noise reduction method. Background technique [0002] There are noise reduction processing technologies that reduce noise components included in audio signals to make audio easier to hear. In the noise reduction processing technology, for example, by subtracting a noise signal (reference signal) picked up by a microphone that mainly picks up noise from an audio signal picked up by a microphone that mainly picks up sound, noise components included in the sound signal can be removed. [0003] Patent Document 1 discloses a technique for preventing reduction of desired sounds and reducing only unnecessary sounds to be reduced. In Patent Document 2, there is disclosed a technique of improving the clarity of dropped sound or the like by an adaptive filter for removing noise. [0004] patent documents [0005] Patent Document 1: Japanese P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R3/00
CPCG01S3/8083G10L21/0216
Inventor 山边孝朗
Owner JVC KENWOOD CORP