Patent
Speech frame disabling circuitry for protection against burst errors of interleaved TDMA frames
Makoto Tsurumaru
- 27 Dec 1996
36
TL;DR: In this article, a speech frame is converted to speech bursts and interleaved over a predetermined number of TDMA frames for transmission, and the transmitted signal is equalized and a quality signal indicating the quality of each burst signal is produced from the equalized signal.
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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 Viterbi-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 further 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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Citations
Patent
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TL;DR: In this paper, a speech signal is decoded by a vocoder and the reconstructed speech samples are provided to a decoded frame check unit, which examines the energy of reconstructed speech and compares it to a range of acceptable energy values; if the energy is not within the range of energy values, a frame erasure is declared and the decoded frames are prevented from being to the speaker in the telephone.
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Method for protecting multi-pulse coders from fading and random pattern bit errors
TL;DR: In this paper, a low-overhead method of protecting multi-pulse speech coders from the effects of severe random or fading pattern bit errors combines a standard error correcting code (convolutional rate 1/2 coding and Viterbi trellis decoding) for protection in random errors with cyclic redundancy code (CRC) error detection for fading errors.
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Patent
Frame erasure or packet loss compensation method
Juin-Hwey Chen,Craig Robert Watkins +1 more
- 14 Aug 1995
TL;DR: In this paper, a preprocessor recognizes that a given frame has been corrupted and modifies the encoded signal so that the decoding thereof will result in improved coding system performance, based on the decoding process and on a predetermined target signal.
48
Method for detecting and masking bad frames in coded speech signals
TL;DR: In this article, the coded speech signal is de-interleaved to obtain a first series of bits comprising the first and second groups and a second series of bit comprising the third group of bits.
47