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US 4,792,856 AGranted
Sampled data memory system as for a television picture magnification system
AssigneeRCA Licensing Corporation
InventorShinichi Shiratsuchi
Life of this patent
Estimating the term…
Abstract
A television picture magnification system which provides real-time magnified video images includes a memory system which stores L horizontal line intervals of samples representing one field of the unmagnified video image during a first time interval and which provide K of those L lines of samples during a second time interval offset from the first time interval by less than one field period. The K lines of samples provided by the memory are interpolated by the system to develop L lines of samples which represent one field of the magnified image. The offset delay between the first and second time intervals ensures that any field of the magnified image includes samples from only one field of the unmagnified image.
Claims7
Circuitry for time-expansion of video signals, occurring as a sequence of field intervals, comprising:
- a source of sampled data video signal;
- memory means, coupled to said source, having a sufficient number of sample storage cells to hold M sample values;
- memory write address signal generating means, coupled to said memory means, for conditioning said memory means to store, during a first time interval, M samples representing one field of said video signal, where M is a positive number;
- memory read address signal generating means, coupled to said memory means, for conditioning said memory means to provide, during a second time interval, N of said stored samples, where N is a positive number less than M;
- and
- means, coupled to said memory means and responsive to the N samples provided thereby for generating M samples of a time-expanded video signal;
- wherein said first and second time intervals each span an amount of time approximately equal to one field interval of said video signal and the beginning of said second time interval is delayed by an amount of time less than one field interval of said video signal relative to the beginning of said first time interval.
4 more elements
Video image magnifying circuitry comprising:
- a source of sampled data video signal representing an unmagnified image;
- memory means, includnng M sample storage elements, coupled to said source and responsive to a write address signal for storing samples provided by said source into said sample storage elements and responsive to a read address signal for providing selected ones of said stored samples;
- write address signal generating means, coupled to said source and to said memory means for generating said write address signal which conditions said memory means to store M successive samples provide by said source during a first predetermined time interval;
- read address signal generating means, coupled to said memory means for generating said read address signal which conditions said memory means to provide N of said stored samples during a second predetermined time interval, where N is a positive number less than M and the beginning of said second predetermined time interval is delayed by a predetermined amount of time with respect to the beginning of said first time interval and spans an amount of time substantially equal to the amount of time spanned by said first time interval;
- and
- signal processing means coupled to said memory means and responsive to the N samples provided thereby for generating M samples of a further video signal representing a magnified image.
3 more elements
Video image magnifying circuitry comprising:
- a source of sampled data video signal representing an unmagnified image, said video signal including a horizontal line synchronizing signal component which defines successive horizontal line intervals of said video signal and a vertical field synchronizing signal component which defines successive field intervals of said video signal, where each of said vertical field intervals includes L horizontal line intervals of samples where L is a positive number;
- signal separating means, coupled to said source for separating said horizontal line synchronizing signal and said vertical field synchronizing signal from said video signal and for delaying said vertical field synchronizing signal by an amount of time corresponding to a predetermined number of horizontal line intervals of said video signal to provide as output signals said vertical field synchronizing signal, a delayed vertical field synchronizing signal and said horizontal line synchronizing signal;
- memory means, coupled to said source, including a sufficient number of sample storage elements to hold samples representing L horizontal line intervals of said sampled data video signal, said memory means being configured to hold samples representing one of said horizontal line intervals of said sampled data video signal in a group of storage elements having a common line-address value and being responsive to a write-line address signal, for storing horizontal line intervals of samples provided by said source and responsive to a read-line address signal for providing selected ones of said stored samples having a common line address value;
- write-line address signal generating means coupled to said memory means and responsive to said horizontal line synchronizing signal and to said vertical field synchronizing signal for generating said write-line address signal which conditions said memory means to store L horizontal line intervals of samples provided by said source during a field interval defined by said vertical field synchronizing signal;
- read address signal generating means, responsive to said horizontal line synchronizing signal and to said delayed vertical field synchronizing signal for generating said read-line address signal which conditions said memory means to provide K horizontal line intervals of samples during a field interval defined by said delayed vertical field synchronizing signal where K is a positive number less than L;
- and
- signal processing means, coupled to said memory means and responsive to the K horizontal line intervals of samples provided thereby for generating L horizontal line intervals of samples of a further sampled data video signal representing a magnified image.
4 more elements
Dependencies are inferred from the claim text.