CA2090284A1 - Method for Detecting and Masking Bad Frames in Coded Speech Signals - Google Patents

Method for Detecting and Masking Bad Frames in Coded Speech Signals

Info

Publication number
CA2090284A1
CA2090284A1 CA2090284A CA2090284A CA2090284A1 CA 2090284 A1 CA2090284 A1 CA 2090284A1 CA 2090284 A CA2090284 A CA 2090284A CA 2090284 A CA2090284 A CA 2090284A CA 2090284 A1 CA2090284 A1 CA 2090284A1
Authority
CA
Canada
Prior art keywords
bits
group
coded speech
speech signal
replicated
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA2090284A
Other languages
French (fr)
Other versions
CA2090284C (en
Inventor
Huan-Yu Su
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nortel Networks Ltd
Original Assignee
Northern Telecom Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Northern Telecom Ltd filed Critical Northern Telecom Ltd
Publication of CA2090284A1 publication Critical patent/CA2090284A1/en
Application granted granted Critical
Publication of CA2090284C publication Critical patent/CA2090284C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0078—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
    • H04L1/0083—Formatting with frames or packets; Protocol or part of protocol for error control

Abstract

The process for detection and masking of bad frames in a coded speech signal resulting from channel transmission errors has been improved. The coded speech signal has a first group of bits comprising the most perceptually significant bits of the coded speech signal, a second group of bits comprising the second most perceptually significant bits and a third group of bits comprising the least perceptually significant bits. The coded speech signal is de-interleaved to obtain a first series of bits comprising the first and second group and a second series of bits comprising the third group of bits.
The first series of bits are convolutionally decoded for recovering the first and second group of bits, with the first group of bits containing error protected bits. A CRC
check is performed by sending the recovered bits of the first group to cyclic redundancy decoding means. The first group of bits is forwarded to speech decoder means if the CRC check is successful. The frame energy and LPC
parameters are replicated for the first and third group of bits and the frame energy, LPC parameters, lag value and sub-frame gain are replicated for the second group of bits, and subsequently the replicated bits are forwarded to the speech coder means, if the CRC check is not successful.
CA002090284A 1992-06-26 1993-02-24 Method for detecting and masking bad frames in coded speech signals Expired - Fee Related CA2090284C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/904,638 US5255343A (en) 1992-06-26 1992-06-26 Method for detecting and masking bad frames in coded speech signals
US07/904,638 1992-06-26

Publications (2)

Publication Number Publication Date
CA2090284A1 true CA2090284A1 (en) 1993-12-27
CA2090284C CA2090284C (en) 1998-07-07

Family

ID=25419488

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002090284A Expired - Fee Related CA2090284C (en) 1992-06-26 1993-02-24 Method for detecting and masking bad frames in coded speech signals

Country Status (2)

Country Link
US (1) US5255343A (en)
CA (1) CA2090284C (en)

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Also Published As

Publication number Publication date
US5255343A (en) 1993-10-19
CA2090284C (en) 1998-07-07

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