Method and system for high definition color TV compatible with existing TV sets, existing broadcasting channels and existing VCR equipment
US5111295A · kind A · utility
Inventor
Key dates
| Filing date | Apr 20, 1990 |
| Grant date | May 5, 1992 |
| Priority date | — |
| Expiry date | Apr 20, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/30
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.