Patent EP0003182A2 successfully refreshed from Google Patents.
EP0003182A2
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EP
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Method of and apparatus for enabling different parts of an input television signal to be made available simultaneously,and television standards converter incorporating said apparatus
Assignee: British Broadcasting Corp
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Filing: 1979-01-16
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Granted: —
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Expires: 1999-01-16
Abstract
Abstract A method of and apparatus for enabling different parts of an input television signal to be made available simultaneously is used as a television standards converter. Successive lines of an input television. signal are cyclically written into n (e.g. 4) successive random access store sections, using in each cycle the same addresses for the different sections. The write addresses are incremented for successive cycles. The sections are read from using for each section addresses which are related to each other and to the write addresses so as to access a desired set of up to n successive lines. These lines are combined by weighted addition to provide an interpolated output line. The read addresses are derived by counting the desired output lines during each field and multiplying the count by the line conversion ratio, (namely the number of lines in each input field divided by the number of lines in each output field). The integral part of the resultant controls the read addresses and the non-integral part controls the weighted addition. A total storage of two fields is used. each divided into n sections. Standards conversion to either higher or lower line rates is possible with improved quality.
Inventors
- 👤 Christopher John Dalton
- 👤 Graham Dudley Roe
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 01:48
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/01; H04N7/0135
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
91 words
A method of enabling different parts of an input television signal to be made available simultaneously, using signal storage, characterised by cyclically writing successive portions of the, input television signal into a plurality of successive random access store sections, using in each cycle addresses for the different sections which are unambiguously related, the addresses being incremented for successive cycles, and reading from the sections using for each section addresses which are related to each other and to the write addresses so as to access a desired set of stored signal portions.
Claim 2
Independent Claim
91 words
A method of enabling different parts of an input television signal to be made available simultaneously, using signal storage, characterised by cyclically writing successive portions of the, input television signal into a plurality of successive random access store sections, using in each cycle addresses for the different sections which are unambiguously related, the addresses being incremented for successive cycles, and reading from the sections using for each section addresses which are related to each other and to the write addresses so as to access a desired set of stored signal portions.
Claim 3
Dependent Claim
17 words
A method according to claim 1, characterised in that each signal portion is a television signal line.
Claim 4
Dependent Claim
25 words
A method according to claim 1 or 2, characterised in that the write addresses for all the store sections are the same for one cycle.
Claim 5
Dependent Claim
32 words
A method according to claim 3, characterised in that the read addresses are so chosen that several successive lines, equal in number to the number of store sections, are made available simultaneously.
Claim 6
Independent Claim
29 words
A method according to any preceding claim, characterised in that a total storage of two fields or pictures is provided, each field of which is divided into store sections.
Claim 7
Independent Claim
27 words
A method according to any preceding claim, characterised by combining several outputs read from the store sections in a weighted addition to provide an interpolated output signal.
Claim 8
Dependent Claim
44 words
A method according to claim 6, characterised in that the weighting is controlled by counting the desired output lines during each output field, multiplying the count by the line conversion ratio, and controlling the weighting in dependence upon the non-integral part of the resultant.
Claim 9
Independent Claim
47 words
A method according to any preceding claim, characterised in that the read addresses are derived by counting the desired output lines during each output field, multiplying the count by the line conversion ratio, and selecting the read address in dependence upon the integral part of the resultant.
Claim 10
Dependent Claim
119 words
Apparatus for enabling different parts of an input television signal to be made available simultaneously using signal storage means, characterised in that the signal storage means (20) comprises a plurality of random access store sections (BLOOHS 1 to 4), and by writing means (52, 16, 18) for cyclically writing successive portions of the input television signal into successive random access store sections, using in each cycle addresses for the different sections which are unambiguously related, the addresses being incremented for successive cycles, and reading means (64, 22) for reading from the sections using for each section addresses which are related to each other and to the write addresses so as to access a desired set of stored signal portions.
Claim 11
Dependent Claim
119 words
Apparatus for enabling different parts of an input television signal to be made available simultaneously using signal storage means, characterised in that the signal storage means (20) comprises a plurality of random access store sections (BLOOHS 1 to 4), and by writing means (52, 16, 18) for cyclically writing successive portions of the input television signal into successive random access store sections, using in each cycle addresses for the different sections which are unambiguously related, the addresses being incremented for successive cycles, and reading means (64, 22) for reading from the sections using for each section addresses which are related to each other and to the write addresses so as to access a desired set of stored signal portions.
Claim 12
Dependent Claim
27 words
Apparatus according to claim 9, characterised in that there is a total storage of two fields or pictures, each field of which is divided into store sections.
Claim 13
Dependent Claim
31 words
Apparatus according to claim 9 or 10, characterised by means (30, 26, 28) for combining several outputs from the store sections in a weighted addition to provide an interpolated output signal.
Claim 14
Dependent Claim
56 words
Apparatus according to claim 11, characterised by a counter (60) for counting the desired output lines during each output field, a multiplier (62) for multiplying the count by the line conversion ratio, and means (30) for controlling the weighting performed by the combining means (26, 28) in dependence upon the non-integral part of the multiplier output.
Claim 15
Dependent Claim
60 words
13 * Apparatus according to any of claims 9 to 12, characterised by a counter (60) for counting the desired output lines during each output field, and a multiplier (62) for multiplying the count by the line conversion ratio, and in that the reading means (22) selects the read address in dependence upon the integral part of the multiplier output.
Claim 16
Dependent Claim
15 words
A television standards converter incorporating apparatus in accordance with any of claims 9 to 13.
References Cited (Backward Citations)
No citation records indexed.
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