Television systems
US4276564A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 9, 1978 |
| Grant date | Jun 30, 1981 |
| Priority date | — |
| Expiry date | Nov 9, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N17/00
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Apparatus for deriving a parameter indicative of the quality of parts of, or the whole of, a television system from an insertion test signal repeated at regular intervals during field blanking periods of a transmitted signal includes a sampling means for providing a digital signal representing the amplitude at a sampling position of the test signal, means for actuating the sampling means, and a computer. The computer is programmed to caculate the quality parameter from a number of the amplitude representative digital signals taken at different sampling positions by the sampling means, to provide the calculated parameter as an output, and to respond to timing origins included in the television signal to thereby control the actuating means. The actuating times are so related to the timing origins that the digital amplitude signals are provided at an average rate which is low compared with the rate at which the signals occur during a single test signal. A digital store is connected between the sampling means and the computer for storing a number of the digital amplitude signals and also for storing request signals for the amplitude signals in such a way that the sampling means is enab…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.