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Speech keyword spotting system and system and method of creating dictionary for the speech keyword spotting system

A keyword and keyword list technology, applied in speech analysis, speech recognition, special data processing applications, etc., can solve problems such as re-establishment and training, recalculation and storage load of the speech keyword detection system

Inactive Publication Date: 2013-02-06
CANON KK
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since a keyword has at least one garbage model, many garbage models will be used at the time of recognition, which causes heavy computation and storage loads for the phonetic keyword detection system
Another disadvantage is that once a keyword is changed or added, the garbage model used for it should be rebuilt and trained

Method used

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  • Speech keyword spotting system and system and method of creating dictionary for the speech keyword spotting system
  • Speech keyword spotting system and system and method of creating dictionary for the speech keyword spotting system
  • Speech keyword spotting system and system and method of creating dictionary for the speech keyword spotting system

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Embodiment Construction

[0032] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Note that the relative arrangement of components and the shape of the device in the embodiments are just examples, and are not intended to limit the scope of the present invention to these examples. Furthermore, in the figures, like reference numerals and letters refer to like items, whereby once an item is defined in one figure, it need not be discussed with respect to subsequent figures.

[0033] (Conventional voice keyword detection system)

[0034] FIG. 1 is a block diagram of a conventional speech keyword detection system 1A.

[0035] In FIG. 1 , a speech keyword detection system 1A using a keyword-independent general garbage model includes a speech input unit 101 , a feature extraction unit 102 , a classifier unit 103 , an output unit 104 , an acoustic model unit 105 and a dictionary unit 106 .

[0036] The speech input unit 101 is used for...

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Abstract

The application relates to a speech keyword spotting system comprising an input unit used for receiving input speech signals, a feature extracting unit used for extracting at least one feature from the input speech signals, a classifier unit used for classifying the input speech signals into target keywords or out-of-vocabulary based on at least one feature and a dictionary, and an output unit used for outputting the classification result. The dictionary comprises grammar and a lexicon, wherein the grammar comprises target keyword lists and at least one sequence used for two identifiers of the out-of-vocabulary; the lexicon comprises pronunciation representing all candidate keywords of speech subsequence of one or more target keywords in the target keyword lists, and pronunciation representing at least one sequence; and one identifier represents a first class of phone, while the other identifier represents a second class of phone. The first class of phone and the second class of phone are clustered based on inherent features of phones. The first class of phone, the second class of phone and the phones of one or more target keywords are described by models.

Description

technical field [0001] The present invention relates to a phonetic keyword spotting system, and a system and method of creating a dictionary for the phonetic keyword spotting system. Background technique [0002] Speech keyword detection techniques aim to detect and recognize predefined speech keywords in continuous or segmented input speech. Speech keyword detection techniques are used in almost all speech recognition applications, such as call center systems, voicemail categorization, and search by content. [0003] In practical speech keyword detection applications, most parts of the input speech do not include keywords. These parts are called Out-Of-Vocabulary (OOV) segments (ie, non-keywords). If an OOV segment is incorrectly identified as a keyword, this is called a false alarm (FA). A high false positive rate can lead to a bad user experience. [0004] Generally speaking, one of the ways to discard OOV data is to build a proper garbage model for OOV data in additi...

Claims

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Application Information

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IPC IPC(8): G10L15/08G10L15/00G06F17/30
Inventor 郭莉莉刘贺飞亓超
Owner CANON KK
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