GB2139448A
Expired / Lapsed
GB
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High Definition Video Signal Transmission
Assignee: British Broadcasting Corp
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Filing: 1984-03-01
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Granted: —
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Expires: 2004-03-01
Abstract
Abstract A high-definition video signal having 4N+1 lines per picture on two interlaced fields is transmitted on two video-bandwidth channels, as a main signal and an auxiliary signal respectively, the main signal being compatible with a standard 2N+1 lines per picture, 2:1 interlaced signal. Each line of the main signal is formed of a combination of two (or more) lines of the same field of the input signal, and each line of the auxiliary signal is also formed of a different combination of the lines of the same field of the input signal. The auxiliary signal comprises a 2N+1 DIVIDED 2 lines per picture 2:1 interlaced signal.
Inventors
- 👤 John Oliver Drewery
- 👤 Ian Childs
Bibliographic Details
Application Number
—
Jurisdiction
GB
Data Source
google_patents
Last Synchronized
2026-10-31 17:33
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/12; H04N7/122; H04N11/00; H04N11/24; H04N11/26
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
92 words
A method of transmitting a high-definition input video signal having 4N+1 lines per picture on two interlaced fields, comprising transmitting a main signal which is compatible with a standard 2N+1/2:1 signal together with an auxiliary signal, in which each output line of the main signal comprises a combination of contributions from two or more lines of the same field of the input signal, and in which each output line of the auxiliary signal comprises a different combination of contributions from two or more lines of the same field of the input signal.
Claim 2
Independent Claim
92 words
A method of transmitting a high-definition input video signal having 4N+1 lines per picture on two interlaced fields, comprising transmitting a main signal which is compatible with a standard 2N+1/2:1 signal together with an auxiliary signal, in which each output line of the main signal comprises a combination of contributions from two or more lines of the same field of the input signal, and in which each output line of the auxiliary signal comprises a different combination of contributions from two or more lines of the same field of the input signal.
Claim 3
Dependent Claim
18 words
A method according to claim 1, in which the combinations are different as between even and odd fields.
Claim 4
Dependent Claim
32 words
A method according to claim 2, in which the combinations used to form the main signal are a and 1-a in one field and 1/2-a and 1/2+a respectively in the next field.
Claim 5
Dependent Claim
25 words
A method according to claim 2, in which the magnitudes of the combinations used to form the main signal are in the proportions 31
44
Claim 6
Dependent Claim
100 words
Apparatus for use in the method of claim 1, comprising an input for receiving a 4N+ 1 lines per picture 2:1 interlaced video signal, and matrix means connected with the input for generating a main signal which is compatible with a standard 2N+1/2:1 signal, and an auxiliary signal, each output line of the main signal comprising a combination of contributions from two or more lines of the same field of the input signal, and each output line of the auxiliary signal comprising a different combination of contributions from two or more lines of the same field of the input signal.
Claim 7
Dependent Claim
45 words
A method of regenerating a high definition video signal from a main signal and an auxiliary signal generated by the method of claim 1, comprising inversely combining the lines of the main and auxiliary signals such as to regenerate the 4N+1 lines of each picture.
Claim 8
Dependent Claim
76 words
Apparatus for regenerating a high definition video signal from a main signal and an auxiliary video signal, substantially as herein described with reference to Figure 4. 9. Apparatus for regenerating a high definition video signal, substantially as herein described with reference to Figure 7. signal generated by the method of claim 1, comprising inverse matrix means for combining the lines of the main and auxiliary signals such as to regenerate the 4N+1 lines of each picture.
Claim 9
Dependent Claim
6 words
Apparatus for transmitting a high definition
Claim 10
Dependent Claim
6 words
Apparatus for transmitting a high definition
References Cited (Backward Citations)
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