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The article presents information about the patent number 7,472,059 related to a method and apparatus for robust speech classification that was assigned to Qualcomm Inc. on December 30, 2008. This method improves the classification accuracy in background noise of voiced and unvoiced speech for multi-mode variable rate coders. A normalized auto-correlation coefficient function threshold is determined for voiced and unvoiced speech.

The article presents information about the patent number 7,478,040 related to a method for adaptive filtering that was assigned to Broadcom Corp. on January 13, 2009. This patent focuses on improving perceptual quality of a speech signal by reducing perceived audio coding noise and increasing the periodicity of voiced portions of speech by attenuating spectral valleys between harmonics.

Evaluates a patent application for a client-server speech processing system filed by Canon Kabushiki Kaisha on May 24, 2000. Schematic diagram showing the data transfer process of the system.

Evaluates a patent application for a speech recognition engine resource during dial tone and subsequent call program, developed by Mitel Knowledge Corporation, filed on September 13, 2000.

Evaluates a patent application for a distributed speech recognition system with multiple functionalities, filed by Dictaphone Corporation on November 30, 2001. Overview of how the system works.