Method and apparatus for removing noise from electronic signals

A noise and signal technology, applied in the field of noise removal and instrumentation from electronic signals, which can solve problems such as lack of practicality, long calculation time, and cumbersome hardware.

Inactive Publication Date: 2003-09-17
埃里弗克姆公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are various methods of suppressing these noise increases, but these methods either require long calculations or cumbersome hardware, or lack practicality

Method used

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  • Method and apparatus for removing noise from electronic signals
  • Method and apparatus for removing noise from electronic signals
  • Method and apparatus for removing noise from electronic signals

Examples

Experimental program
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Embodiment Construction

[0012] FIG. 1 is a block diagram of a noise reduction system of an embodiment that uses knowledge when speech is generated from physiological information of vocal activity. The system includes a microphone 10 and a sensor 20 that provide signals to at least one processor 30 . The processor includes a noise reduction subsystem or algorithm.

[0013] Figure 2 is a block diagram of the noise removal system / algorithm of one embodiment, assuming a single noise source and a direct path to the microphone. The noise removal system block diagram includes a pictorial depiction of an embodiment method with a single signal source (100) and a single noise source (101). This algorithm uses two microphones, a "signal" microphone (MIC1, 102) and a "noise" microphone (MIC2, 103), but this is not required. MIC1 is mainly used to capture signals containing some noise, while MIC2 is mainly used to capture noise containing signals. This is a common configuration for conventional advanced sound ...

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Abstract

A method and system for removing acoustic noise from human speech, wherein noise is removed from the speech regardless of its type, magnitude, or direction. The system includes a microphone and a voice activity detection (VAD) data stream coupled to the processor. The microphone receives the sound signal, and the VAD produces a binary 1 when there is speech (voiced and unvoiced), and a 0 when there is no speech. The processor includes a noise reduction algorithm capable of generating a transfer function. These transfer functions include transfer functions generated in response to a determination that vocalization information is missing from the received audio signal within a defined period of time. The transfer functions also include a transfer function generated in response to a determination that vocalization information is present in the audio signal received within a defined period of time. A transfer function is used to generate at least one noise-reduced speech data stream.

Description

technical field [0001] The present invention is in the field of mathematical methods and electronic systems for removing or suppressing unwanted acoustic noise from sound transmission or recording. Background technique [0002] In a typical voice application, human speech is recorded or stored and transmitted to receivers at various locations. There may be one or more noise sources in the user's environment that pollute the useful signal (the user's voice) with acoustic noise that the user does not want. This makes it difficult for the receiver to understand the user's voice, whether it is received by a human or a machine. This problem is exacerbated by the proliferation of mobile communication devices such as cellular phones and personal digital assistants. There are various methods for suppressing these noise increases, but these methods either require long calculation times or cumbersome hardware, or lack practicality. Many such methods are described, for example, in V...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L15/20G10L11/02G10L19/02
CPCG10L19/0204G10L21/0208G10L25/78G10L2021/02082G10L2021/02161G10L2021/02168
Inventor 格雷戈里·伯内特埃里克·F·伯瑞特泰勒
Owner 埃里弗克姆公司
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