GB1046779A

GB1046779A – Improvements in or relating to television and like data transmission systems
– Google Patents

GB1046779A – Improvements in or relating to television and like data transmission systems
– Google Patents
Improvements in or relating to television and like data transmission systems

Info

Publication number
GB1046779A

GB1046779A
GB33125/62A
GB3312562A
GB1046779A
GB 1046779 A
GB1046779 A
GB 1046779A
GB 33125/62 A
GB33125/62 A
GB 33125/62A
GB 3312562 A
GB3312562 A
GB 3312562A
GB 1046779 A
GB1046779 A
GB 1046779A
Authority
GB
United Kingdom
Prior art keywords
detail
difference
circuits
value
signal
Prior art date
1962-08-29
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
GB33125/62A
Inventor
Edward Colin Cherry
Donald Edwin Pearson
Marcus Paul Barton
Muthanna Hussain Kubba
Herbert Bernhardt Voelcker
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.)

National Research Development Corp UK

Original Assignee
National Research Development Corp UK
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.)
1962-08-29
Filing date
1962-08-29
Publication date
1966-10-26

1962-06-22
Priority to GB24053/62A
priority
Critical
patent/GB1029815A/en

1962-08-29
Application filed by National Research Development Corp UK
filed
Critical
National Research Development Corp UK

1962-08-29
Priority to GB33125/62A
priority
patent/GB1046779A/en

1963-06-26
Priority to US290863A
priority
patent/US3299204A/en

1963-08-26
Priority to US304730A
priority
patent/US3324237A/en

1963-08-29
Priority to FR946078A
priority
patent/FR1383790A/en

1966-10-26
Publication of GB1046779A
publication
Critical
patent/GB1046779A/en

Status
Expired
legal-status
Critical
Current

Links

Espacenet

Global Dossier

Discuss

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

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

Abstract

1,046,779. Television. NATIONAL RESEARCH DEVELOPMENT CORPORATION. Aug. 22, 1963 [Aug. 29, 1962], No. 33125/62 Addition to 1,029,815. Heading H4F. The invention relates to a bandwidth compression system (stated to be of general application but described only as applied to television) which is similar to that described in Specification 1,029,815 but differs in that the original video signal is converted to digital form before application to the detail detector. Thus, as shown in Fig. 1, the signal from picture scanner 1 is applied initially to an analogue to digital converter 2 which analyses the signal amplitude according to 128 possible levels and generates a seven-digit, parallel, binary number. In contrast to the system of Specification 1,029,815 the converter operates with an invariable sampling interval which is selected to correspond to that employed for signals of maximum detail, i.e. 1/ 6 microsecond. The resulting digital signals are then applied to a detail detector 3 (see below), which determines whether the signal is of high or low detail, and also through a delay circuit 17 to a supply gate 16. In accordance with the result of the detection in 3 a supply rate selector 4 is caused to control the supply gate 16 so that every signal sample from converter 2 is transmitted during intervals of high detail whilst only one sample in nine is transmitted (the remainder being lost) during intervals of low detail. The remaining operations involving stores 6, 8 and 9 and the control of selector 4 to cause the transmission of one sample in three during conditions of store overload and underload proceed as described in Specification 1,029,815. In the detail detector, Fig. 4, the seven-digit, parallel, binary numbers, which appear on loads 41-47 from the output of analogue to digital converter 211, are moved through a four-stage shift register 1À1-4À1, so as to make available simultaneously numbers presentative of the amplitude of the video signal at four adjacent 1/ 6 microsecond intervals. The instantaneous stage states are then compared by means of difference circuits 62, 63, 64, adding circuits 66, 68, and dividing circuits 70, 71. Thresholdvalues from sources 73, 75 and 77 are subtracted from the results of the comparisons in difference circuits 72, 74, 76 and if the results are positive circuits 78, 79 and 80 cause signals to pass to an » OR » gate 81. An output on line 82 indicates high detail; no output indicates low detail. The operation performed by elements 62, 72, 73 and 78 is to determine whether the absolute value of the difference between stages 1.1 and 2.1 less a first threshold value is positive, the operation performed by circuit elements 65, 66, 70, 74, 75 and 79 is to determine whether the absolute value of the difference between one-half the value in stages 2 and 3 and the value in stage 1 less a second threshold value is positive; the operation performed by circuit elements 64, 68, 71, 76, 77 and 80 is to determine whether the absolute value of the difference between onethird of the values in stages 2, 3, 4 and the value in stage 1 less a third threshold value is positive.

GB33125/62A
1962-08-29
1962-08-29
Improvements in or relating to television and like data transmission systems

Expired

GB1046779A
(en)

Priority Applications (5)

Application Number
Priority Date
Filing Date
Title

GB24053/62A

GB1029815A
(en)

1962-08-29
1962-06-22
Improvements in television and like data transmission systems

GB33125/62A

GB1046779A
(en)

1962-08-29
1962-08-29
Improvements in or relating to television and like data transmission systems

US290863A

US3299204A
(en)

1962-08-29
1963-06-26
Television and like data transmission systems

US304730A

US3324237A
(en)

1962-08-29
1963-08-26
Television and like data transmission systems

FR946078A

FR1383790A
(en)

1962-08-29
1963-08-29

Improvements to television systems and analog data transmission systems

Applications Claiming Priority (1)

Application Number
Priority Date
Filing Date
Title

GB33125/62A

GB1046779A
(en)

1962-08-29
1962-08-29
Improvements in or relating to television and like data transmission systems

Publications (1)

Publication Number
Publication Date

GB1046779A
true

GB1046779A
(en)

1966-10-26

Family
ID=10348885
Family Applications (2)

Application Number
Title
Priority Date
Filing Date

GB24053/62A
Expired

GB1029815A
(en)

1962-08-29
1962-06-22
Improvements in television and like data transmission systems

GB33125/62A
Expired

GB1046779A
(en)

1962-08-29
1962-08-29
Improvements in or relating to television and like data transmission systems

Family Applications Before (1)

Application Number
Title
Priority Date
Filing Date

GB24053/62A
Expired

GB1029815A
(en)

1962-08-29
1962-06-22
Improvements in television and like data transmission systems

Country Status (2)

Country
Link

US
(1)

US3324237A
(en)

GB
(2)

GB1029815A
(en)

Cited By (1)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

US4862264A
(en)

*

1985-12-24
1989-08-29
British Broadcasting Corporation
Method of coding a video signal for transmission in a restricted bandwidth

Families Citing this family (27)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

US3344231A
(en)

*

1967-09-26

Encoding and variable scan rate to provide

US3472953A
(en)

*

1966-03-17
1969-10-14
Xerox Corp
Graphic communication system for transmitting reduced redundancy signals at the maximum rate of the communication link

US3501586A
(en)

*

1966-09-01
1970-03-17
Battelle Development Corp
Analog to digital to optical photographic recording and playback system

US3492432A
(en)

*

1967-03-08
1970-01-27
Bell Telephone Labor Inc
Pulse amplitude modulation multiplex video transmission system

US3580999A
(en)

*

1968-12-23
1971-05-25
Bell Telephone Labor Inc
Redundancy reduction data compressor with luminance weighting

BE745978A
(en)

*

1969-02-20
1970-07-16
Thomson Csf

VISUALIZATION SYSTEM

US3604846A
(en)

*

1969-03-03
1971-09-14
Mead Corp
Method and system for reconstruction of half-tone images

US3670096A
(en)

*

1970-06-15
1972-06-13
Bell Telephone Labor Inc
Redundancy reduction video encoding with cropping of picture edges

US3732495A
(en)

*

1970-07-20
1973-05-08
Radiation Inc
Signal transmission and modulation technique therefor

FR2106533A1
(en)

*

1970-09-15
1972-05-05
Licentia Gmbh

US3726992A
(en)

*

1970-12-07
1973-04-10
Mainichi Broadcasting Syst
Multiplex communication system for transmitting television and facsimile signals

US3624306A
(en)

*

1971-01-21
1971-11-30
George H Myers
Method and system for compressing bandwidth

US3810102A
(en)

*

1972-03-31
1974-05-07
Telserv Inc
System for transmission and analysis of biomedical data

US3783187A
(en)

*

1972-05-05
1974-01-01
Hitachi Ltd
Facsimile transmission system

JPS4929718A
(en)

*

1972-07-19
1974-03-16

FR2206544B1
(en)

*

1972-11-10
1976-12-31
Trt Telecom Radio Electr

GB1488863A
(en)

*

1974-01-23
1977-10-12
Marconi Co Ltd
Television transmission

US4393371A
(en)

*

1979-06-05
1983-07-12
Morgan-Smith Electronics Ltd.
Analogue to digital signal conversion and storage system

DE3173288D1
(en)

*

1980-06-20
1986-02-06
Toshiba Kk
Sampled signal generation circuit

US4626827A
(en)

*

1982-03-16
1986-12-02
Victor Company Of Japan, Limited
Method and system for data compression by variable frequency sampling

GB2132856B
(en)

*

1982-10-29
1986-09-10
Matsushita Electric Ind Co Ltd
Signal conversion method and video tape recorder employing the same method

US4763207A
(en)

*

1985-10-15
1988-08-09
R. R. Donnelley & Sons Company
Digital method and system for reproducing analog data

USH996H
(en)

1987-01-20
1991-11-05
Recognition Equipment Incorporated
High resolution page image display system

US4899146A
(en)

*

1987-04-30
1990-02-06
R. R. Donnelley & Sons Company
Method of and apparatus for converting digital data between data formats

US4816829A
(en)

*

1987-04-30
1989-03-28
R. R. Donnelley & Sons Company
Method of and apparatus for converting digital data between data formats

US5253059A
(en)

*

1992-05-15
1993-10-12
Bell Communications Research, Inc.
Method and circuit for adjusting the size of a video frame

US8446530B2
(en)

*

2001-09-28
2013-05-21
Entropic Communications, Inc.
Dynamic sampling

Family Cites Families (3)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

NL244226A
(en)

*

1958-10-10

US2974195A
(en)

*

1958-10-30
1961-03-07
Bell Telephone Labor Inc
Economy in television transmission

US3225333A
(en)

*

1961-12-28
1965-12-21
Ibm
Differential quantitized storage and compression

1962

1962-06-22
GB
GB24053/62A
patent/GB1029815A/en
not_active
Expired

1962-08-29
GB
GB33125/62A
patent/GB1046779A/en
not_active
Expired

1963

1963-08-26
US
US304730A
patent/US3324237A/en
not_active
Expired – Lifetime

Cited By (1)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

US4862264A
(en)

*

1985-12-24
1989-08-29
British Broadcasting Corporation
Method of coding a video signal for transmission in a restricted bandwidth

Also Published As

Publication number
Publication date

US3324237A
(en)

1967-06-06

GB1029815A
(en)

1966-05-18

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