Method and apparatus for standards conversion of television signals

Claim 2

sections are the same for one cycle..]. 4. A method according to claim .[.3.]. .Iadd.1.Iaddend., wherein the read addresses are so chosen that several successive lines, equal in number to the number of store sections,

Claim 3

are made available simultaneously. 5. A method according to claim 1, wherein a total storage of two fields or pictures is provided, each field

Claim 4

of which is divided into store sections. 6. A method according to claim 1, wherein several outputs read from the store sections are combined in a

Claim 5

weighted addition to provide an interpolated output signal. 7. A method according to claim 6, wherein 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

Claim 6

upon the non-integral part of the resultant. 8. A method according to .[.claim.]. .Iadd.claims .Iaddend.1, .Iadd.4, 5, 6 or 7 .Iaddend.wherein 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

Claim 7

resultant. 9. Apparatus for simultaneously enabling different parts of an input video signal to be made available and comprising signal storage means, the signal storage means comprising a plurality of random access store sections; writing means for cyclically writing successive .[.portions.]. .Iadd.lines .Iaddend.of the input video signal relating to successive portions of the video picture into successive .Iadd.ones of said .Iaddend.random access store sections, each of which is capable of storing several video lines but less than one field, .Iadd.said sections providing a total storage of at least two consecutive fields, .Iaddend.using in each cycle .[.write addresses for.]. .Iadd.essentially the same write address sequences within .Iaddend.the different .Iadd.store .Iaddend.sections .[.which are unambiguously related.].; means for incrementing the write addresses for successive cycles; and reading means for reading from the sections using for each section read addresses which are related to each other and to the write addresses so as .Iadd.simultaneously .Iaddend.to access .Iadd.from each stored field .Iaddend.a desired set of .[.stored signal portions.]. .Iadd.line samples from corresponding positions from a plurality of stored lines with each line sample of the set being read from a different store section.Iaddend..

Claim 8

resultant. 9. Apparatus for simultaneously enabling different parts of an input video signal to be made available and comprising signal storage means, the signal storage means comprising a plurality of random access store sections; writing means for cyclically writing successive .[.portions.]. .Iadd.lines .Iaddend.of the input video signal relating to successive portions of the video picture into successive .Iadd.ones of said .Iaddend.random access store sections, each of which is capable of storing several video lines but less than one field, .Iadd.said sections providing a total storage of at least two consecutive fields, .Iaddend.using in each cycle .[.write addresses for.]. .Iadd.essentially the same write address sequences within .Iaddend.the different .Iadd.store .Iaddend.sections .[.which are unambiguously related.].; means for incrementing the write addresses for successive cycles; and reading means for reading from the sections using for each section read addresses which are related to each other and to the write addresses so as .Iadd.simultaneously .Iaddend.to access .Iadd.from each stored field .Iaddend.a desired set of .[.stored signal portions.]. .Iadd.line samples from corresponding positions from a plurality of stored lines with each line sample of the set being read from a different store section.Iaddend..

Claim 9

Apparatus according to claim 9, wherein there is a total storage of two fields or pictures, each field of which is divided into store sections.

Claim 10

Apparatus according to claim 9, including means for combining several outputs from the store sections in a weighted addition to provide an

Claim 11

interpolated output signal. 12. Apparatus according to claim 11, including a counter for counting the desired output lines during each output field, a multiplier for multiplying the count by the line conversion ratio, and means for controlling the weighting performed by the combining means in

Claim 12

dependence upon the non-integral part of the multiplier output. 13. Apparatus according to claim 9, including a counter for counting the desired output lines during each output field, and a multiplier for multiplying the count by the line conversion ratio, and wherein the reading means selects the read address in dependence upon the integral

Claim 13

part of the multiplier output. 14. A method of simultaneously enabling different parts of an input video signal to be made available, using signal storage, comprising the steps of cyclically writing successive .[.portions.]. .Iadd.lines .Iaddend.of the input video signal relating to successive portions of the video picture into .Iadd.successive ones of .Iaddend.a plurality of .[.successive.]. random access store sections, .Iadd.said sections providing a total storage of at least two consecutive fields, .Iaddend.using in each cycle .[.write addresses for.]. .Iadd.essentially the same write address sequences within .Iaddend.the different .Iadd.store .Iaddend.sections which are unambiguously related, the write addresses for all the store sections being the same for one cycle, incrementing the write addresses for successive cycles; and reading from the .Iadd.store .Iaddend.sections using for each section read addresses which are related to each other and to the write addresses so as .Iadd.simultaneously .Iaddend.to access .Iadd.from each stored field .Iaddend.a desired set of .[.stored signal portions.]. .Iadd.line samples from corresponding positions from a plurality of stored lines with each line sample of the set being read from a different store section.Iaddend..

Claim 14

part of the multiplier output. 14. A method of simultaneously enabling different parts of an input video signal to be made available, using signal storage, comprising the steps of cyclically writing successive .[.portions.]. .Iadd.lines .Iaddend.of the input video signal relating to successive portions of the video picture into .Iadd.successive ones of .Iaddend.a plurality of .[.successive.]. random access store sections, .Iadd.said sections providing a total storage of at least two consecutive fields, .Iaddend.using in each cycle .[.write addresses for.]. .Iadd.essentially the same write address sequences within .Iaddend.the different .Iadd.store .Iaddend.sections which are unambiguously related, the write addresses for all the store sections being the same for one cycle, incrementing the write addresses for successive cycles; and reading from the .Iadd.store .Iaddend.sections using for each section read addresses which are related to each other and to the write addresses so as .Iadd.simultaneously .Iaddend.to access .Iadd.from each stored field .Iaddend.a desired set of .[.stored signal portions.]. .Iadd.line samples from corresponding positions from a plurality of stored lines with each line sample of the set being read from a different store section.Iaddend..

Claim 17

dependence upon the integral part of the resultant. 16. Apparatus for simultaneously enabling different parts of an input video signal to be made available and comprising signal storage means, the signal storage means comprising a plurality of random access store sections; writing means for cyclically writing successive portions of the input video signal relating to successive portions of the video picture into successive random access store sections, using in each cycle write addresses for the different sections which are unambiguously related; means for incrementing the write addresses for successive cycles; reading means for reading from the sections using for each section read addresses which are related to each other and to the write addresses so as to access a desired set of stored signal portions; and further including a counter for counting the desired output during each output field, and a multiplier for multiplying the count by the line conversion ratio, and wherein the reading means selects the read address in dependence upon the integral part of the multiplier output. .[.17. A method of simultaneously enabling different parts of an input video signal to be made available, using signal storage having a storage capacity of substantially one video field, comprising the steps of cyclically writing successive portions of the input video signal relating to successive portions of the video picture into a plurality of successive random access store sections, using in each cycle write addresses for the different sections which are unambiguously related; incrementing the write addresses for successive cycles; and reading from the sections using for each section read addresses which are related to each other and to the write addresses so as to provide simultaneous access to one stored signal portion only in each store section..]. .[.18. A method according to claim 17 wherein each signal portion is a video signal line..]. .[.19. A method according to claim 17 wherein the read addresses are so chosen that several successive lines, equal in number to the number of store sections, are made available

Claim 18

simultaneously..]. .[.20. A method according to claim 17 wherein several outputs read from the store sectons are combined in a weighted addition to provide an interpolated output signal..]. .[.21. A method according to claim 17 wherein 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..]. .[.22. Apparatus for simultaneously enabling different parts of an input video signal to be made available and comprising signal storage means, the signal storage means having a storage capacity of substantially one video field and comprising a plurality of random access store sections; writing means for cyclically writing successive portions of the input video signal relating to successive portions of the video picture into successive random access store sections, using in each cycle write addresses for the different sections which are unambiguously related; means for incrementing the write addresses for successive cycles; and reading means for reading from the sections using for each section read addresses which are related to each other and to the write addresses so as to provide simultaneous access to one stored signal portion only in each store section..]. .[.23. Apparatus according to claim 22, including means for combining several outputs from the store sections in a weighted addition to provide an interpolated output signal..]. .[.24. Apparatus according to claim 22, including a counter for counting the desired output lines during each output field, a multiplier for multiplying the count by the line conversion ratio, and means for controlling the weighting performed by the combining means in dependence upon the non-integral part of the multiplier output..].