Display signal device and method for providing compatibility bet

Details Display signal device and method for providing compatibility bet Display signal device and method for providing compatibility bet

1990-12-27

1992-08-04

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 12, H04N 701, H04N 1120

Patent

active

051363801

ABSTRACT:
There is disclosed a device and a circuit to provide compatibility between NTSC television and HDTV by using dual channel transmission system. One embodiment may be arranged with means for generating a first display signal, a pre-filter (13) which prevents aliasing by filtering the first display signal, a first scanning converter (14), a first NTSC encoder (15), a first RF modulator (16), a delay unit (17), a first line rejecter (18), a second scanning converter (19), a first postfilter (20), a second line rejecter (21), a subtractor, a first frequency shifter (23), a signal reconstruction circuit (24), a second NTSC encoder (25), and a second RF modulator (26).

REFERENCES:
patent: 4907069 (1990-03-01), Bretl
patent: 4931855 (1990-06-01), Salvadorini

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