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Microphone apparatus, noise reduction method and recording apparatus

A technology of microphones and equipment, applied in the direction of microphone signal combination, sensors, sound-emitting devices, etc.

Inactive Publication Date: 2005-03-30
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

First, a non-directional microphone unit with non-directional properties must be used

Method used

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  • Microphone apparatus, noise reduction method and recording apparatus
  • Microphone apparatus, noise reduction method and recording apparatus
  • Microphone apparatus, noise reduction method and recording apparatus

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Embodiment Construction

[0047] In a video camera such as a home digital video camera, it is likely that sound is picked up by a built-in microphone device. Since the miniaturization of electrical appliances and electrical equipment has been accelerated in recent years, recording equipment such as VTRs, magnetic disk equipment, etc., and microphones built into these machines and equipment are placed in close proximity to each other, thus posing a problem: Vibration noise and acoustic noise generated by equipment can easily invade the microphone. Similarly, miniaturization can cause problems: when the user operates various camera functions such as zoom or focus while taking pictures, and operates switches, inadvertently touches the built-in microphone or something around, thereby introducing noise through the case. Undesirable noise and unpleasant touch noise during playback.

[0048] Incidentally, in the case of taking pictures in a relatively quiet environment, even a slight touch noise can become h...

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Abstract

The purpose of this invention is to achieve vibration-dependent noise reduction by the use of a microphone to pick up an audio signal and a vibration sensor. The microphone apparatus according to a preferred embodiment of the present invention is one having one or more microphone, one or more sensor, noise extraction means for extracting the noise bandwidth section from the output signal of the sensor, an adaptive filter coordinated with the microphone for receiving the output signal of the noise extraction means as the reference input signal, and an adder for subtracting the output signal of the adaptive filter from the output signal of the microphone, wherein the vibration detection directions of the microphone and the sensor match, and so do the output polarities of the vibration signal.

Description

[0001] Cross References to Related Applications [0002] This application is based on Japanese priority application JP2003-285294 filed with the Japan Patent Office on August 1, 2003, and the contents incorporated herein by reference are within the scope permitted by law. field of invention [0003] The present invention relates to a microphone device and a noise reduction method suitable for use in a recording device having, for example, a built-in camera. Background technique [0004] The applicant of the present patent application proposed a microphone device, a vibration-dependent noise reduction method, and a device with a plurality of microphone units in an earlier patent application in Japanese Application Laid-Open No. 2002-367234 , wherein the microphone units are placed in an opposed relationship. Because the microphone that collects the audio signal is also used as a vibration sensor, this is the so-called sensorless noise reduction technique. [0005] However, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/16G10K11/178H04R3/00
CPCH04R3/005G10K11/178G10K2210/1051
Inventor 小泽一彦
Owner SONY CORP
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