Reduction of speech quality degradation caused by packet loss

Details Reduction of speech quality degradation caused by packet loss Reduction of speech quality degradation caused by packet loss

2007-09-18

2007-09-18

McFadden, Susan (Department: 2626)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

Reexamination Certificate

active

10418202

ABSTRACT:
A speech decoding device is provided is capable of reducing degradation of speech quality caused by concealment processing performed when a loss of a packet has occurred, e.g., in speech packet communications using a VoIP (Voice over Internet Protocol) or the like. A decoding circuit decodes speech from a packet received through an input terminal and stores an internal signal in an updating buffer circuit, the internal signal produced in the decoding process and to be used in a decoding process for a subsequent packet to be subsequently received. The decoding circuit produces, based on the internal signal stored in the updating buffer circuit, concealed speech corresponding to a packet having not been received, and outputs the produced concealed speech. The internal signal is updated using the concealed speech.

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“7kHz Audio-Coding Within 64 KBIT/S”; ITU-T Recommendation G.722 1988, pp. 1-76.

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