AMR multimode codec for coding speech signals having...

Details AMR multimode codec for coding speech signals having... AMR multimode codec for coding speech signals having...

2008-07-22

2008-07-22

Lerner, Martin (Department: 2626)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

C370S465000, C370S466000

Reexamination Certificate

active

07403892

ABSTRACT:
A delay unit is provided to delay adapting modes of a codec if channel communication conditions are improving. A less robust mode having a higher intrinsic quality is selected only after some delay. The quality of the communication is measured to give quality values for successive measurement occasions. The delay unit comprises a plurality of memory cells in a memory for storing the quality values of the communication conditions of the channel for the most recent measurement occasions. A selector operates according to an algorithm for selecting one of the memory cells. The content of the selected cell is used to set the mode of the codec.

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Bruhn et al., “Concepts and solutions for link adaptation and inband signaling for the GSM AMR speech coding standard,” 1999 IEEE 49th Vehicular Technology Conference, May 16-20, 1999, vol. 3, pp. 2451 to 2455.

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