Horizontal stability measurement apparatus
US4303939A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 11, 1980 |
| Grant date | Dec 1, 1981 |
| Priority date | — |
| Expiry date | Aug 11, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N17/06
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Horizontal synchronizing pulses are separated from a composite video signal and applied to a detector for producing an error signal representative of the timebase error of each pulse relative to a timebase reference having a period of approximately one horizontal line. Changes in the error signal are inhibited when the time period between pulses differs substantially from one line. Peak values of a given frequency component of the error signal are detected and averaged to provide an output signal manifestation representative of the frequency, amplitude and grouping of the timebase errors and which is relatively unbiased by pulses having a period substantially different from the period of the timebase reference. The apparatus may be used, illustratively, for quality control purposes and timebase error source identification in video disc mastering, replication and playback apparatus as well as for measurement of the effectiveness of timebase correction apparatus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.