Speech signal processing apparatus for extracting a speech signal from a noisy speech signal
Patent 5220610 Issued on June 15, 1993. Estimated Expiration Date: 
May 28, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
May 28, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesDevice for the processing of voice signals A method for indicating the presence of speech in an audio signal Patent #: 4959865 InventorsAssigneeApplicationNo. 706573 filed on 05/28/1991US Classes:704/233Detect speech in noiseExaminersPrimary: Kemeny, Emanuel S.Attorney, Agent or FirmForeign Patent References
International ClassG10L 005/00Foreign Application Priority Data1990-05-28 JPAbstractA signal processing apparatus extracts a speech signal from an inputted noisy speech signal. In the signal processing apparatus, a band division process including a Fourier transformation is performed for an inputted speech signal, thereby outputting spectrum signals of plural channels, and a cepstrum analysis process is performed for the spectrum signals of plural channels, thereby outputting a cepstrum analysis result. Thereafter, a speech signal interval of the inputted noisy speech signal is detected in response to the cepstrum analysis result, and then, a speech signal is extracted from the inputted noisy speech signal according to the detected speech signal interval.Other References
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