Speech frame disabling circuitry for protection against burst er

Details Speech frame disabling circuitry for protection against burst er Speech frame disabling circuitry for protection against burst er

1996-12-27

1999-06-29

Dorvil, Richemond

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704226, 704242, 704233, 704244, G10L 302

Patent

active

059182040

ABSTRACT:
A speech frame is converted to speech bursts and interleaved over a predetermined number of TDMA frames for transmission. At a receive site, the transmitted signal is equalized and a quality signal indicating the quality of each burst signal is produced from the equalized signal. The equalized signal is de-interleaved, and then Vitrerbi-decoded speech samples are produced. A CRC circuit performs an error check operation on the decoded speech samples to produce an error bit if a speech frame failed the check. A decision circuit compares the quality signal with a first reference value and produces a first disable signal when it is lower than the first reference value. The decision circuit compares a total sum of the quality signals produced from the predetermined number of burst signals with a second reference value and produces a second disable signal when the total sum of the quality signals is lower than the second reference value. A speech decoder operates on the decoded speech samples to recover speech frames and masks speech frames in response to the error bit from the CRC circuit and the first and second disable signals from the decision circuit.

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