Invention Grant
US07672842B2 Method and system for FFT-based companding for automatic speech recognition
失效
用于自动语音识别的基于FFT的压扩的方法和系统
- Patent Title: Method and system for FFT-based companding for automatic speech recognition
- Patent Title (中): 用于自动语音识别的基于FFT的压扩的方法和系统
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Application No.: US11493196Application Date: 2006-07-26
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Publication No.: US07672842B2Publication Date: 2010-03-02
- Inventor: Bhiksha Ramakrishnan , Bent Schmidt-Nielsen , Lorenzo Turicchia , Rahul Sarpeshkar
- Applicant: Bhiksha Ramakrishnan , Bent Schmidt-Nielsen , Lorenzo Turicchia , Rahul Sarpeshkar
- Applicant Address: US MA Cambridge
- Assignee: Mitsubishi Electric Research Laboratories, Inc.
- Current Assignee: Mitsubishi Electric Research Laboratories, Inc.
- Current Assignee Address: US MA Cambridge
- Agent Dirk Brinkman; Gene Vinokur
- Main IPC: G10L19/02
- IPC: G10L19/02 ; G10L21/00 ; G10L15/00 ; H04B15/00
Abstract:
A method and system processes a speech signal. A fast Fourier transform is performed on a speech signal to produce a speech signal having a plurality of frequency bands in a frequency domain. For each frequency bands, filter the speech signal in the frequency domain with a spatial broadband filter, compress the broadband filtered speech signal, filter the compressed speech signal with a spatial narrowband filter; and, expand the narrowband filtered signal to an expanded signal
Public/Granted literature
- US20080027708A1 Method and system for FFT-based companding for automatic speech recognition Public/Granted day:2008-01-31
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