发明名称 |
DESIGNING METHOD FOR TREE-STRUCTURED FILTER BANK AND VOICE RECOGNITION PREPROCESSOR USING TREE-STRUCTURED FILTER BANK |
摘要 |
PURPOSE: A voice recognition preprocessor using a TSFB(Tree-Structured Filter Bank) is provided to sample stronger voice characteristics in noisy environment by using a TSFB and controlling the Q of a channel filter and the gain of channel output of the TSFB. CONSTITUTION: A voice recognition preprocessor consists of a pre-emphasis(110) emphasizing the bandwidth of input audio signals; a TSFB(120) including secondary BPFs(Band Pass Filter) and secondary LPFs(Low Pass Filter) in tree structure, for dividing the bandwidth-emphasized audio signals by each frequency channel; an adaptive Q control unit(130) adaptively controlling the Q of the TSFB by considering input signals of peripheral channels; and an adaptive gain control unit(140) adaptively controlling the gain of each channel output. The adaptive Q control of the channel filters improves the frequency contrast ratio of audio signal channels. The adaptive gain control of channel output enhances the time contrast ratio of audio signal frames. |
申请公布号 |
KR20020014320(A) |
申请公布日期 |
2002.02.25 |
申请号 |
KR20000047535 |
申请日期 |
2000.08.17 |
申请人 |
KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY |
发明人 |
KIL, I MAN;KIM, YEONG IK |
分类号 |
G10L15/28;(IPC1-7):G10L15/00 |
主分类号 |
G10L15/28 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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