Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1987-10-29
1989-03-07
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358167, 358 36, 358139, 375 13, 455296, 333 28R, 364726, 36472401, 364825, H04N 514
Patent
active
048110973
ABSTRACT:
In one embodiment, the video signal generator outputs a standardized analog video signal. The signal generator includes a clock controlling a sequential address generator. The address generator activates a memory device that is, for example, a ROM. A distortion conditioned standardized digital video signal is stored in the ROM. This distortion conditioned signal has distortion correction characteristics matching an output filter. Following the ROM is a D to A converter that converts the conditioned digital video signal into a conditioned analog video signal. A simple filter follows the D to A converter. The filter introduces distortion into the signal applied at its input but since that signal already has distortion correction characteristics therein, the distortion correction characteristics of the input signal match and substantially cancel the distortion introduced into that signal by the filter. Therefore, a standardized analog video signal is produced at the output of the filter. The real time video signal processor, in another embodiment of the present invention, utilizes a distortion correction operator in conjunction with a memory that introduces into the digital video signal distortion correction characteristics. As with the signal generator, the distortion correction characteristics match and cancel the distortion introduced into the analog signal by the output filter.
REFERENCES:
patent: 3946214 (1976-03-01), Stuart et al.
patent: 4044381 (1977-08-01), Shimano et al.
patent: 4163258 (1979-07-01), Ebihara et al.
patent: 4430743 (1984-02-01), Watanabe
patent: 4458362 (1984-07-01), Berkovitz et al.
patent: 4476491 (1984-10-01), Murata et al.
patent: 4612575 (1986-09-01), Ishman et al.
patent: 4635117 (1987-01-01), Labb
patent: 4755879 (1988-07-01), Hinson
Ritter David W.
Zortea Anthony
Groody James J.
Parker Michael D.
Videotek, Inc.
LandOfFree
Video signal processor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Video signal processor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Video signal processor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1673105