JPS57103430A - Dpcm encoding device - Google Patents

Dpcm encoding device

Info

Publication number
JPS57103430A
JPS57103430A JP55179893A JP17989380A JPS57103430A JP S57103430 A JPS57103430 A JP S57103430A JP 55179893 A JP55179893 A JP 55179893A JP 17989380 A JP17989380 A JP 17989380A JP S57103430 A JPS57103430 A JP S57103430A
Authority
JP
Japan
Prior art keywords
signal
sum
supplied
difference
sub
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
JP55179893A
Other languages
Japanese (ja)
Other versions
JPH0342556B2 (en
Inventor
Hiroshi Yoshioka
Masahiko Machida
Tokuya Fukuda
Takao Takahashi
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Priority to JP55179893A priority Critical patent/JPS57103430A/en
Publication of JPS57103430A publication Critical patent/JPS57103430A/en
Publication of JPH0342556B2 publication Critical patent/JPH0342556B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/79—Processing of colour television signals in connection with recording
    • H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • H04N9/804—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components
    • H04N9/8042—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components involving data reduction
    • H04N9/8045—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components involving data reduction using predictive coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/79—Processing of colour television signals in connection with recording
    • H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • H04N9/804—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components

Landscapes

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

Abstract

PURPOSE:To improve the forecast characteristic, by operating the sum and the difference between sub-Nyquist sampled color composite video signals on two lines of the same sampling phase and by supplying the sum and the difference to a DPCM encoder having a forecaster. CONSTITUTION:An NTSC color video signal is sampled in an A/D converter 2 by a clock CP0 of the four-fold frequency of a chrominance sub-carrier frequency fSC and is converted to a PCM signal and is supplied to a sub-Nyquist sampling circuit 4. In the circuit 4, PCM data is sampled again by a clock CP1 of a frequency 2fSC and an inversion clock -CP1 and is compressed to 1/2 and is supplied to an adder 9 and a subtractor 10, and the sum and the difference between data on two lines are operated and are supplied to DPCM encoders 13 and 14 having forecasters, respectively. A luminance signal Y and a color signal C of outputs from encoders 13 and 14 are outputted alternately for every one line by a switch 16, and a parity for error detection and correction is added, and these signals Y and C are recorded synchronously with the vertical synchronizing signal alternately by heads HA and HB, thus obtaining optimum forecast for each of the luminance signal Y and the color signal C.
JP55179893A 1980-12-18 1980-12-18 Dpcm encoding device Granted JPS57103430A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55179893A JPS57103430A (en) 1980-12-18 1980-12-18 Dpcm encoding device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55179893A JPS57103430A (en) 1980-12-18 1980-12-18 Dpcm encoding device

Publications (2)

Publication Number Publication Date
JPS57103430A true JPS57103430A (en) 1982-06-28
JPH0342556B2 JPH0342556B2 (en) 1991-06-27

Family

ID=16073737

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55179893A Granted JPS57103430A (en) 1980-12-18 1980-12-18 Dpcm encoding device

Country Status (1)

Country Link
JP (1) JPS57103430A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52119018A (en) * 1976-03-31 1977-10-06 Hitachi Ltd Difference coding
JPS53136481A (en) * 1977-05-02 1978-11-29 Philips Nv Hybrid circuit having semiconductor circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52119018A (en) * 1976-03-31 1977-10-06 Hitachi Ltd Difference coding
JPS53136481A (en) * 1977-05-02 1978-11-29 Philips Nv Hybrid circuit having semiconductor circuit

Also Published As

Publication number Publication date
JPH0342556B2 (en) 1991-06-27

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