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GB1391434A - Television standards conversion - Google Patents

Television standards conversion

Info

Publication number
GB1391434A
GB1391434A GB796971A GB796971A GB1391434A GB 1391434 A GB1391434 A GB 1391434A GB 796971 A GB796971 A GB 796971A GB 796971 A GB796971 A GB 796971A GB 1391434 A GB1391434 A GB 1391434A
Authority
GB
United Kingdom
Prior art keywords
line
conversion
ratio
output
effected
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
GB796971A
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 GB796971A priority Critical patent/GB1391434A/en
Publication of GB1391434A publication Critical patent/GB1391434A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/01—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level
    • H04N7/0135—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level involving interpolation processes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/01—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level
    • H04N7/0105—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level using a storage device with different write and read speed

Landscapes

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

Abstract

1391434 Television standards conversion BRITISH BROADCASTING CORP 24 March 1972 [26 March 1971] 7969/71 Heading H4F Television line standard conversion is effected by the following steps in either order (i) synthesising each output line by combining information taken from two or more input lines, and (ii) changing the line frequency by a simple ratio of small integers which ratio is slightly different from the actual ratio of the output to input line frequencies. When the simple ratio is slightly greater than the ratio of the output to input line frequencies, e.g. 3 : 2 for 625 to 405 conversion, or 5 : 6 or 4 : 5 for 525 to 625 conversion, then surplus lines are eliminated. The interpolation, i.e. synthesising of each output line, is effected with six one-line period delays connected in series, the resulting simultaneously available seven input lines being added together with different weighting coefficients. The line frequency changing, i.e. time redistribution, is effected using eight oneline stores. Reference is directed towards Figs. 1 and 4, of Specification 1,326,386. The converter may be used in combination with a field standards converter described in Specification 1,052,438.
GB796971A 1971-03-26 1971-03-26 Television standards conversion Expired GB1391434A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB796971A GB1391434A (en) 1971-03-26 1971-03-26 Television standards conversion

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB796971A GB1391434A (en) 1971-03-26 1971-03-26 Television standards conversion

Publications (1)

Publication Number Publication Date
GB1391434A true GB1391434A (en) 1975-04-23

Family

ID=9843260

Family Applications (1)

Application Number Title Priority Date Filing Date
GB796971A Expired GB1391434A (en) 1971-03-26 1971-03-26 Television standards conversion

Country Status (1)

Country Link
GB (1) GB1391434A (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4276565A (en) 1978-01-18 1981-06-30 British Broadcasting Corporation Method and apparatus for standards conversion of television signals
FR2500245A1 (en) * 1981-02-02 1982-08-20 Rca Corp TELEVISION SAMPLE SIGNAL PROCESSING SYSTEM, DIGITAL TELEVISION DIGITAL SIGNAL TRANSMISSION SYSTEM, TRANSCODING METHOD, AND TELEVISION DIGITAL SIGNAL RECEIVER
FR2506102A1 (en) * 1981-05-11 1982-11-19 Rca Corp TELEVISION SIGNAL TRANSCODER AND DIGITAL MULTIPLIER
GB2126450A (en) * 1982-09-02 1984-03-21 British Broadcasting Corp Time compression of sampled signals
US4455611A (en) * 1981-05-11 1984-06-19 Rca Corporation Multiplier for multiplying n-bit number by quotient of an integer divided by an integer power of two
US4550335A (en) * 1981-02-02 1985-10-29 Rca Corporation Compatible and hierarchical digital television system standard
FR2574240A1 (en) * 1984-11-30 1986-06-06 Rca Corp PROGRESSIVE SCAN TELEVISION SYSTEM
US4661862A (en) * 1984-04-27 1987-04-28 Rca Corporation Differential PCM video transmission system employing horizontally offset five pixel groups and delta signals having plural non-linear encoding functions
GB2255254A (en) * 1991-03-28 1992-10-28 Matsushita Electric Industrial Co Ltd Television standard conversion apparatus
GB2262681A (en) * 1991-12-04 1993-06-23 Samsung Electronics Co Ltd Television signal standard conversion

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE31460E (en) 1978-01-18 1983-12-06 British Broadcast Corporation Method and apparatus for standards conversion of television signals
US4276565A (en) 1978-01-18 1981-06-30 British Broadcasting Corporation Method and apparatus for standards conversion of television signals
DE3249578C2 (en) * 1981-02-02 1988-04-28 Rca Corp., New York, N.Y., Us
US4550335A (en) * 1981-02-02 1985-10-29 Rca Corporation Compatible and hierarchical digital television system standard
DE3203382A1 (en) 1981-02-02 1982-11-04 RCA Corp., 10020 New York, N.Y. COMPATIBLE, TRANSCODABLE AND HERARCHIC DIGITAL TELEVISION SYSTEM
FR2500245A1 (en) * 1981-02-02 1982-08-20 Rca Corp TELEVISION SAMPLE SIGNAL PROCESSING SYSTEM, DIGITAL TELEVISION DIGITAL SIGNAL TRANSMISSION SYSTEM, TRANSCODING METHOD, AND TELEVISION DIGITAL SIGNAL RECEIVER
US4455611A (en) * 1981-05-11 1984-06-19 Rca Corporation Multiplier for multiplying n-bit number by quotient of an integer divided by an integer power of two
FR2506102A1 (en) * 1981-05-11 1982-11-19 Rca Corp TELEVISION SIGNAL TRANSCODER AND DIGITAL MULTIPLIER
GB2126450A (en) * 1982-09-02 1984-03-21 British Broadcasting Corp Time compression of sampled signals
US4661862A (en) * 1984-04-27 1987-04-28 Rca Corporation Differential PCM video transmission system employing horizontally offset five pixel groups and delta signals having plural non-linear encoding functions
FR2574240A1 (en) * 1984-11-30 1986-06-06 Rca Corp PROGRESSIVE SCAN TELEVISION SYSTEM
GB2168219A (en) * 1984-11-30 1986-06-11 Rca Corp Progressive scan television system
US4605962A (en) * 1984-11-30 1986-08-12 Rca Corporation Progressive scan television system with video compression exceeding display line rate
GB2255254A (en) * 1991-03-28 1992-10-28 Matsushita Electric Industrial Co Ltd Television standard conversion apparatus
GB2255254B (en) * 1991-03-28 1995-01-04 Matsushita Electric Industrial Co Ltd Television standard conversion apparatus
GB2262681A (en) * 1991-12-04 1993-06-23 Samsung Electronics Co Ltd Television signal standard conversion
GB2262681B (en) * 1991-12-04 1995-08-16 Samsung Electronics Co Ltd Television signal standard conversion apparatus and method

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Legal Events

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