Bit error concealment methods for speech coding

Details Bit error concealment methods for speech coding Bit error concealment methods for speech coding

2005-04-26

2005-04-26

Dorvil, Richemond (Department: 2654)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

Reexamination Certificate

active

06885988

ABSTRACT:
A method of concealing bit errors in a signal is provided. The method comprises encoding a signal parameter according to a set of constraints placed on a signal parameter quantizer. The encoded signal parameter is decoded and compared against the set of constraints. Finally, the method includes declaring the decoded signal parameter invalid when the set of constraints is violated. Training binned ranges of gain values provide a threshold for selecting data segments to examine for violation of constraints on gain differences. Further, an additional method comprises training a threshold function T(qlg(m−1), Δqlg(m−1) used in a codec bit error detecting technique. The threshold function is based upon a first training file having N signal segments. The method includes encoding the first training file and determining gain values qlg(m) of each of the N signal segments within the encoded first training file. The gain values form a range and the range is divided into bins. Next, the gain values are stored in a second training file. The method associates each of particular ones of the gain values and gain differences within the sequence qlg(m−1) and Δqlg(m−1) with a corresponding one of the bins.

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