Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1990-04-20
1992-05-05
Peng, John K.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358 11, 358 12, 358138, 358141, H04N 701, H04N 704, H04N 1106, H04N 1120
Patent
active
051112957
ABSTRACT:
This high definition TV method and system are compatible with existing TV sets, existing TV broadcast channels and existing VCRS. Each standard-size picture element in a standard NTSC color television luminance signal is split into two ("Alternate Sampled Luminance" or "ASL") smaller high resolution (HR) picture elements. These two HR elements form a group, and are labeled `A` and `B` according to their relative positions in the group. Positive-going and negative-going pulses in a square-wave sampling control signal serve to control sampling for obtaining HR elements. HR elements having the same label are sampled in the same frame scanning period and then are used to represent the whole of each group in that frame. HR picture elements are sampled one label at a time and are transmitted in consecutive frames. Thus, all `A` HR elements are transmitted in Frame "A"; all `B` HR elements are transmitted in Frame "B". Frames "A" and "B" alternate with each other. A burst signal one-half fundamental frequency of the sampling control signal is inserted for synchronization into the blanking period of field one in each frame sequence. The resulting luminance signal advantageously is directly compatible with standard NTSC signals. The sampling control system is regenerated in a TV receiver decoder for sampling the incoming ASL-coded luminance signal. The samples are stored in memory. Alternate retrieval of picture elements from memory and incoming signal (or from composed data storage from two successive Frames) thereby provides a High Resolution luminance signal.
REFERENCES:
patent: 3909839 (1975-09-01), Inaba et al.
patent: 4866519 (1989-09-01), Lucas et al.
patent: 4868654 (1989-09-01), Juri et al.
patent: 4884138 (1989-11-01), Storey
patent: 4897722 (1990-01-01), Flory
patent: 4974079 (1990-11-01), Emori
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