Apparatus for modifying the time base of signals
US3947874A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 29, 1974 |
| Grant date | Mar 30, 1976 |
| Priority date | — |
| Expiry date | Oct 29, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/953
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Time base instability of signals in a train thereof is corrected by use of analog shift registers. As employed in the correction of time base instability of video signals, plural analog shift registers are used. The same clock rate is used, respectively, to clock video signals into and out of analog shift registers. The clock rate is set so that samples of a video signal which has a normal duration may load all stages of an analog shift register within the duration of the normal signal. Thus, samples of a stretched signal fully load all stages of the analog shift register, the trailing part of such stretched signal being discarded. Conversely, a video signal which has been compressed, although being fully loaded into the analog shift register, loads less than all of the analog shift register stages.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.