JPS5763978A - Transmitter of picture signal - Google Patents

Transmitter of picture signal

Info

Publication number
JPS5763978A
JPS5763978A JP55139593A JP13959380A JPS5763978A JP S5763978 A JPS5763978 A JP S5763978A JP 55139593 A JP55139593 A JP 55139593A JP 13959380 A JP13959380 A JP 13959380A JP S5763978 A JPS5763978 A JP S5763978A
Authority
JP
Japan
Prior art keywords
transmitter
refresh
circuit
information
block
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.)
Pending
Application number
JP55139593A
Other languages
Japanese (ja)
Inventor
Kazumoto Iinuma
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP55139593A priority Critical patent/JPS5763978A/en
Publication of JPS5763978A publication Critical patent/JPS5763978A/en
Pending 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
    • H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)

Abstract

PURPOSE:To reduce the refresh information and to improve the quality of a received picture, by sending the refresh information to a wrong block from a transmitter only when an error is detected by a receiver when the band compressed code of a TV signal is transmitted. CONSTITUTION:The TV signal supplied from a terminal 1 is applied to an A//D converter 21 of a transmitter 2 as well as to a timing pulse generator 20. Then the signal digitized by the converter 21 is coded by dividing the relative information with each block through a quantizing circuit 24, a selector 26, a coding circuit 27, etc. and adding the information which is divided with each block. The signal decoded by the transmitter 2 and divided each block is applied to a buffer memory 38 of a receiver 3 via a transmission line 5 and decoded by a decoding circuit 37 to be delivered from a D//A converter 31. When an error is detected at the receiver 3, the refresh request is sent to the transmitter 2 from a refresh request signal generating circuit 39 via a transmission line 6. The refresh request is applied to the selector 26 and the circuit 27 through a refresh control circuit 29 of the transmitter 2. Then the refresh information is sent from the transmitter 2.
JP55139593A 1980-10-06 1980-10-06 Transmitter of picture signal Pending JPS5763978A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55139593A JPS5763978A (en) 1980-10-06 1980-10-06 Transmitter of picture signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55139593A JPS5763978A (en) 1980-10-06 1980-10-06 Transmitter of picture signal

Publications (1)

Publication Number Publication Date
JPS5763978A true JPS5763978A (en) 1982-04-17

Family

ID=15248877

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55139593A Pending JPS5763978A (en) 1980-10-06 1980-10-06 Transmitter of picture signal

Country Status (1)

Country Link
JP (1) JPS5763978A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61116482A (en) * 1984-11-10 1986-06-03 Nippon Telegr & Teleph Corp <Ntt> Transmission error refreshing method
JPS63310294A (en) * 1987-06-12 1988-12-19 Nec Corp Moving picture encoding system
JPH05191798A (en) * 1992-01-13 1993-07-30 Nec Corp Refresh system in inter-frame prediction coder decoder
WO1994018794A1 (en) * 1993-02-12 1994-08-18 Thomson-Csf Reduced throughput image recording method and device therefor
JPH0787480A (en) * 1993-09-13 1995-03-31 Nec Corp Picture coding/decoding device and picture refresh method
WO1998002002A1 (en) * 1996-07-05 1998-01-15 Nippon Telegraph And Telephone Corporation Image communication system and method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54148316A (en) * 1978-05-12 1979-11-20 Nec Corp Decoding device for television signals
JPS54160113A (en) * 1978-06-09 1979-12-18 Toshiba Corp Signal transmission system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54148316A (en) * 1978-05-12 1979-11-20 Nec Corp Decoding device for television signals
JPS54160113A (en) * 1978-06-09 1979-12-18 Toshiba Corp Signal transmission system

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61116482A (en) * 1984-11-10 1986-06-03 Nippon Telegr & Teleph Corp <Ntt> Transmission error refreshing method
JPS63310294A (en) * 1987-06-12 1988-12-19 Nec Corp Moving picture encoding system
JPH05191798A (en) * 1992-01-13 1993-07-30 Nec Corp Refresh system in inter-frame prediction coder decoder
WO1994018794A1 (en) * 1993-02-12 1994-08-18 Thomson-Csf Reduced throughput image recording method and device therefor
FR2701623A1 (en) * 1993-02-12 1994-08-19 Thomson Csf Method of recording reduced-rate images and device for implementing it.
JPH0787480A (en) * 1993-09-13 1995-03-31 Nec Corp Picture coding/decoding device and picture refresh method
WO1998002002A1 (en) * 1996-07-05 1998-01-15 Nippon Telegraph And Telephone Corporation Image communication system and method
US6111917A (en) * 1996-07-05 2000-08-29 Nippon Telegraph And Telephone Corporation Image communication system and method

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