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Voice activity detection

A technology of voice activity and activity, which is applied in speech analysis, instruments, etc., and can solve the problem that the noise reference is not directly available

Inactive Publication Date: 2013-01-16
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, a suitable noise reference may not be directly available in these cases, and the noise reference may have to be derived indirectly

Method used

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Embodiment Construction

[0074] In speech processing applications (eg, voice communication applications such as telephony), it may be desirable to perform accurate detection on segments of audio signals carrying speech information. Such voice activity detection (VAD) may be important, for example, when preserving voice information. A speech coder (also known as a coder-decoder (codec) or vocoder) is typically configured to allocate more bits to the segment identified as noise than is used to encode the segment identified as noise. Segments of speech are encoded such that misidentification of segments carrying speech information may degrade the quality of that information in decoded segments. In another example, the noise reduction system may aggressively attenuate low-energy unvoiced speech segments if the voice activity detection stage fails to identify these segments as speech.

[0075] Recent attention to wideband (WB) and super wideband (SWB) codecs has emphasized the preservation of high frequen...

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Abstract

Implementations and applications are disclosed for detection of a transition in a voice activity state of an audio signal, based on a change in energy that is consistent in time across a range of frequencies of the signal.

Description

[0001] Claim of priority under 35 U.S.C. §119 [0002] This patent application claims No. 61 of the title "Systems, Methods, and Apparatus for Speech Feature Detection (SYSTEMS, METHODS, AND APPARATUS FOR SPEECH FEATURE DETECTION)" filed on April 22, 2010 and assigned to the assignee. Priority to Provisional Application No. / 327,009 (Attorney Docket No. 100839P1). technical field [0003] The invention relates to the processing of speech signals. Background technique [0004] Many activities that used to take place in a quiet office or home environment are now performed in acoustically variable situations such as cars, streets or coffee shops. For example, a person may wish to communicate with another person using a voice communication channel. The channel may be provided, for example, by a mobile wireless handset or headset, walkie-talkie, two-way radio, car kit, or another communication device. Accordingly, a large amount of voice communication is conducted using mobile...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L25/18G10L25/60G10L25/93
CPCG10L25/78G10L25/93
Inventor 埃里克·维瑟伊恩·埃尔纳恩·刘辛钟元
Owner QUALCOMM INC
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