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Intelligent gradient noise reduction system

A noise reduction, intelligent technology, applied in speech analysis, instruments, etc., can solve the problem of not providing noise suppression capability

Inactive Publication Date: 2010-03-31
MOTOROLA MOBILITY LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So when the user speaks into the front port, the omnidirectional microphone picks up that voice signal and also equally picks up any other peripheral sound such as background noise, thus not providing any noise suppression capability

Method used

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  • Intelligent gradient noise reduction system
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Embodiment Construction

[0021] While the specification concludes with claims defining features of embodiments of the invention that are regarded as novel, it is believed that the methods, systems and other embodiments will be better understood by considering the following description in conjunction with the accompanying drawings, in which The same reference numerals are used throughout the figures.

[0022] As required, detailed embodiments of the present methods and systems are disclosed herein. It is to be understood, however, that the disclosed embodiments are exemplary only, which may be embodied in various forms. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a teaching for teaching one skilled in the art to modify and modify any appropriately detailed structure. The form employs a representative basis for an embodiment of the invention. Also, the terms and idioms used herein should not b...

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Abstract

An intelligent noise reduction system (100) is provided. The system can include a gradient microphone (110) to produce a gradient speech signal, a correction unit (116) to de-emphasize a high frequency gain imparted by the gradient microphone, a Voice Activity Detector 120 (VAD) to determine portions of speech activity (701) and portions of noise activity (702) in the gradient speech signal, an Automatic Gain Control 130 (AGC) unit to adapt a speech gain (740) of the gradient speech signal to minimize variations in speech signal levels, and a controller (140) to control the speech gain appliedby the AGC to the portions of noise activity to preserve a speech to noise level ratio between speech activity and noise activity in the gradient speech signal.

Description

technical field [0001] The present invention relates to noise suppression, and more particularly, to an intelligent gradient noise reduction system. Background technique [0002] Mobile devices that provide voice communications typically include noise reduction systems for suppressing undesired noise. The undesired noise may be ambient noise, such as background noise, that is present when the user speaks into the mobile device. A microphone that captures a voice signal from a user can capture the undesired background noise and generate a composite signal that includes the voice signal and the undesired background noise. If the undesired noise is not sufficiently suppressed, the undesired background noise can degrade the speech signal quality. [0003] Omnidirectional microphones capture speech from all directions. Referring to FIG. 9 , an exemplary sensitivity pattern 900 for an omnidirectional microphone is shown. The front port, where the microphone captures sound, cor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/02
CPCG10L25/78G10L21/0208G10L25/84
Inventor 罗伯特·A·茹雷克乔尔·A·克拉克
Owner MOTOROLA MOBILITY LLC
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