Variable digital phase-shifter and digital velocity corrector for use in video recorders
US4737724A · kind A · utility
9Cited by
2References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 20, 1986 |
| Grant date | Apr 12, 1988 |
| Priority date | — |
| Expiry date | May 20, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/95
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A variable digital phase-shifter comprises a variable-propagation-time phase corrector consisting of a nonrecursive transversal digital filter having a predetermined even number N of coefficients. The filter is coupled with an amplitude corrector consisting of a nonrecursive transversal digital bandpass filter with an odd number of coefficients, a multiplier and a summing circuit for correcting the variations in gain of the phase corrector in order to obtain an approximately constant overall gain of the variable digital phase-shifter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.