GB1415520A - Transmission of digital information - Google Patents

Transmission of digital information

Info

Publication number
GB1415520A
GB1415520A GB5218473A GB5218473A GB1415520A GB 1415520 A GB1415520 A GB 1415520A GB 5218473 A GB5218473 A GB 5218473A GB 5218473 A GB5218473 A GB 5218473A GB 1415520 A GB1415520 A GB 1415520A
Authority
GB
United Kingdom
Prior art keywords
coarse
arrangement
combination
previous
samples
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.)
Expired
Application number
GB5218473A
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.)
British Broadcasting Corp
Original Assignee
British Broadcasting 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 British Broadcasting Corp filed Critical British Broadcasting Corp
Priority to GB5218473A priority Critical patent/GB1415520A/en
Publication of GB1415520A publication Critical patent/GB1415520A/en
Expired 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N11/00—Colour television systems
    • H04N11/04—Colour television systems using pulse code modulation
    • H04N11/042—Codec means
    • 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
    • H04N19/587—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal sub-sampling or interpolation, e.g. decimation or subsequent interpolation of pictures in a video sequence
    • 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
    • H04N19/59—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving spatial sub-sampling or interpolation, e.g. alteration of picture size or resolution
    • 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
    • H04N19/90—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using coding techniques not provided for in groups H04N19/10-H04N19/85, e.g. fractals

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Color Television Systems (AREA)

Abstract

1415520 Digital television picture transmission BRITISH BROADCASTING CORP 20 March 1974 [23 Feb 1973 9 Nov 1973] 9027/73 and 52184/73 Addition to 1289015 Headings H4P and H4F In an arrangement as disclosed in parent Specification 1,289,015 where for example in a digital television picture transmission a coded equivalent signal of each picture point is compared with the previous coded equivalent and a coarse or fine adjusting signal is transmitted dependent on the difference, the arrangement is modified so that comparison is made with a combination of more than one previous equivalent signals, the combination being in any desired proportion. In one embodiment, information corresponding to odd samples is used during odd pictures and correspondingly with even samples/even pictures. Rapid movement or abrupt change continues to switch the system into coarse mode, picture elements immediately adjacent those coarsely described being updated at sending and receiving terminals by linear interpolation between those on either side. In a further modification if a new value lies nearer to the extremity of the previously sent fine range than would be defined by switching into coarse mode, then the corresponding extremity of the fine range is sent. Coarse quantization by itself can cause contouring in areas of low detail but rapid picture motion, which is undesirable. In an improvement this may be reduced partially by converting the contouring to a more random form by adding a "dither" waveform, e.g. a sine wave to the analogue signal before sampling and which may be an appreciable fraction of a coarse level. This is of particular advantage when used with a PAL or NTSC chrominance signal sampled at N/M times the sub-carrier frequency. In one arrangement N = 3, M = 1. Also with PAL/NTSC, the inputs to an interpolator can be selected to be three data inputs from current input to the coder so that the colour sub-carrier is always sampled at the same phase position. It should be arranged that the reference for the difference calculation is a combination of previous samples which has a high probability of being nearly equal to a current sample.
GB5218473A 1970-06-15 1973-11-09 Transmission of digital information Expired GB1415520A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB5218473A GB1415520A (en) 1970-06-15 1973-11-09 Transmission of digital information

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB2895370 1970-06-15
GB902773 1973-02-23
GB5218473A GB1415520A (en) 1970-06-15 1973-11-09 Transmission of digital information

Publications (1)

Publication Number Publication Date
GB1415520A true GB1415520A (en) 1975-11-26

Family

ID=27255289

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5218473A Expired GB1415520A (en) 1970-06-15 1973-11-09 Transmission of digital information

Country Status (1)

Country Link
GB (1) GB1415520A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2475834A1 (en) * 1980-02-07 1981-08-14 Rca Corp METHOD AND DEVICE FOR REDUCING NOISE IN A SAMPLE SIGNAL
FR2529043A1 (en) * 1982-06-18 1983-12-23 Thomson Csf A=D TV signal conversion system - includes sampling and addition to random signal to form spatial average sample signals
FR2529414A1 (en) * 1982-06-25 1983-12-30 Thomson Csf METHOD AND SYSTEM FOR COMPRESSING DATA FLOW TRANSMITTED BETWEEN A TRANSMITTER AND A RECEIVER, APPLIED TO A SYSTEM FOR TRANSMITTING TELEVISION IMAGES
EP0507356A2 (en) * 1986-12-19 1992-10-07 Matsushita Electric Industrial Co., Ltd. Bi-level image display signal processing apparatus

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2475834A1 (en) * 1980-02-07 1981-08-14 Rca Corp METHOD AND DEVICE FOR REDUCING NOISE IN A SAMPLE SIGNAL
FR2529043A1 (en) * 1982-06-18 1983-12-23 Thomson Csf A=D TV signal conversion system - includes sampling and addition to random signal to form spatial average sample signals
FR2529414A1 (en) * 1982-06-25 1983-12-30 Thomson Csf METHOD AND SYSTEM FOR COMPRESSING DATA FLOW TRANSMITTED BETWEEN A TRANSMITTER AND A RECEIVER, APPLIED TO A SYSTEM FOR TRANSMITTING TELEVISION IMAGES
EP0098198A2 (en) * 1982-06-25 1984-01-11 Thomson-Csf Method and system for data rate compression of data transmitted between at least a transmitter and a receiver of television pictures
EP0098198A3 (en) * 1982-06-25 1985-01-23 Thomson-Csf Method and system for data rate compression of data transmitted between at least a transmitter and a receiver of television pictures
EP0507356A2 (en) * 1986-12-19 1992-10-07 Matsushita Electric Industrial Co., Ltd. Bi-level image display signal processing apparatus
EP0507356A3 (en) * 1986-12-19 1993-07-14 Matsushita Electric Industrial Co., Ltd Bi-level image display signal processing apparatus

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee