Error masking in a variable rate vocoder

Details Error masking in a variable rate vocoder Error masking in a variable rate vocoder

G - Physics

10

L

G10L 19/00 (2006.01) G10L 21/02 (2006.01)

Patent

CA 2635914

An apparatus and method perform speech signal compression by variable rate coding of frames of digitized speech samples. The level of speech activity for each frame of digitized speech samples is determined and an output data packet rate is selected from a set of rates based upon the determined level of frame speech activity. Errors are masked in frames of data by providing an indication of a frame abnormality in a current frame. Data is stored of at least one previous frame and the stored data is provided in response to the indication of a frame abnormality. The indication of a frame abnormality is responded to by processing the stored data to reduce values represented thereby. A new frame of data is then produced from the processed data for use as the current frame of data.

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