CA2154885A1 - Efficient Transcoding Device and Method - Google Patents

Efficient Transcoding Device and Method

Info

Publication number
CA2154885A1
CA2154885A1 CA2154885A CA2154885A CA2154885A1 CA 2154885 A1 CA2154885 A1 CA 2154885A1 CA 2154885 A CA2154885 A CA 2154885A CA 2154885 A CA2154885 A CA 2154885A CA 2154885 A1 CA2154885 A1 CA 2154885A1
Authority
CA
Canada
Prior art keywords
transcoder
transcoding
vectors
transcoding device
encoding
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
CA2154885A
Other languages
French (fr)
Other versions
CA2154885C (en
Inventor
M. Vedat Eyuboglu
Mei Yong
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.)
Motorola Solutions Inc
Original Assignee
M. Vedat Eyuboglu
Mei Yong
Codex Corporation
Motorola, Inc.
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 M. Vedat Eyuboglu, Mei Yong, Codex Corporation, Motorola, Inc. filed Critical M. Vedat Eyuboglu
Publication of CA2154885A1 publication Critical patent/CA2154885A1/en
Application granted granted Critical
Publication of CA2154885C publication Critical patent/CA2154885C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/40—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using video transcoding, i.e. partial or full decoding of a coded input stream followed by re-encoding of the decoded output stream
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B14/00—Transmission systems not characterised by the medium used for transmission
    • H04B14/02—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation
    • H04B14/06—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using differential modulation, e.g. delta modulation
    • H04B14/066—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using differential modulation, e.g. delta modulation using differential modulation with several bits [NDPCM]
    • H04B14/068—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using differential modulation, e.g. delta modulation using differential modulation with several bits [NDPCM] with adaptive feedback

Abstract

The present invention provides a transcoder (400) for transcoding of digitally encoded bit streams produced by predictive encoders. The transcoder of this invention is less complex than previously known transcoders in terms of both computational and storage requirements. This efficiency is achieved by combining decoding and re-encoding steps into one step. This one-step transcoding is accomplished by modifying the originally quantized vectors and then requantizing and noiseless encoding these vectors into a bit stream in accordance with a predetermined objective (1200).
CA002154885A 1994-01-07 1994-12-01 Efficient transcoding device and method Expired - Fee Related CA2154885C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US08/179,020 1994-01-07
US08/179,020 US5537440A (en) 1994-01-07 1994-01-07 Efficient transcoding device and method
PCT/US1994/013840 WO1995019072A1 (en) 1994-01-07 1994-12-01 Efficient transcoding device and method

Publications (2)

Publication Number Publication Date
CA2154885A1 true CA2154885A1 (en) 1995-07-13
CA2154885C CA2154885C (en) 1999-07-20

Family

ID=22654894

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002154885A Expired - Fee Related CA2154885C (en) 1994-01-07 1994-12-01 Efficient transcoding device and method

Country Status (6)

Country Link
US (1) US5537440A (en)
EP (1) EP0691054B1 (en)
JP (1) JPH08507669A (en)
CA (1) CA2154885C (en)
DE (1) DE69432142T2 (en)
WO (1) WO1995019072A1 (en)

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Also Published As

Publication number Publication date
EP0691054A4 (en) 1999-04-14
CA2154885C (en) 1999-07-20
US5537440A (en) 1996-07-16
JPH08507669A (en) 1996-08-13
DE69432142T2 (en) 2003-07-24
EP0691054A1 (en) 1996-01-10
WO1995019072A1 (en) 1995-07-13
EP0691054B1 (en) 2003-02-19
DE69432142D1 (en) 2003-03-27

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