Television circuit arrangement for field and line frequency doub

Details Television circuit arrangement for field and line frequency doub Television circuit arrangement for field and line frequency doub

1983-11-17

1986-08-05

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358180, H04N 322, H04N 701

Patent

active

046046518

ABSTRACT:
In a television circuit arrangement for field and line frequency doubling and picture part magnification (zooming), in order to obtain the frequency doubling, information is written, alternately, into two field memories (M1, M2) during a field period having line periods at a given writing speed (clock frequency fc), whereby the reading from the field memories takes place at twice the writing speed. For a picture part magnification to be carried out in a simple manner, a magnification control circuit (TG, S3, S4, S11, S12) having a clock signal change-over circuit (S3, S4) is provided, as a result of which during writing, a higher writing speed (clock frequency 2fc) than the said given writing speed (clock frequency fc) is used during a part of the field periods and of the line periods, which part is substantially inversely proportional to the ratio between the higher writing speed and the given writing speed. For intermittent writing, one or more change-over circuits (S11, S12) are provided at the memory signal inputs, which provides, besides a more effective information storage and an improvement of the picture quality, the possibility of movement detection and recursive signal processing for noise reduction.

REFERENCES:
patent: 4429327 (1984-01-01), Oakley
patent: 4435728 (1984-03-01), Raven
patent: 4496974 (1985-01-01), Heitmann

Affiliated with

Also associated with

Rating

Television circuit arrangement for field and line frequency doub does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Television circuit arrangement for field and line frequency doub, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Television circuit arrangement for field and line frequency doub will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-971676