Time base generator for color image processor
US4631740A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 9, 1985 |
| Grant date | Dec 23, 1986 |
| Priority date | — |
| Expiry date | Apr 9, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/08
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A color image processing system is described which provides more realistic hard copy color images from composite video system input signals than previously available. The analog video information is converted to digital form by an analog-to-digital converter. The converter operates under control of a time base generator (100). The time base generator (100) provides more accurate control over the converter than the system clock signal. The generator (100) receives pulses from the synchronization separator, and following a programmable time delay supplies a control pulse to the converter to cause it to sample the analog waveform and convert it to digital format. The generator (100) employs a delay line (300) to detect the fraction of a system clock period between the sync pulse and the next clock pulse. The specified number of clock pulses are allowed to elapse. Then the delay line (300) is used to provide the necessary further delay. Once digitized, the video signal is converted from an additive color system to a subtractive one and enhanced before being supplied to a color plotter (8).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.