Method and apparatus for digitizing television signals

Details Method and apparatus for digitizing television signals Method and apparatus for digitizing television signals

1986-06-05

1988-03-01

Masinick, Michael A.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 31, 358 36, 358 37, H04N 1702

Patent

active

047290110

ABSTRACT:
An arrangement for digitizing television signals, particularly the staircase portion of the vertical interval test signal transmitted by the British Broadcasting Corporation and the Independent Broadcasting Authority comprises a luminance/chrominance separator (2) and two analog to digital converters (ADC's) (6, 9). The ADC(6) digitizes the color subcarrier which has a low amplitude but a high frequency while the ADC(9) digitizes the high amplitude low frequency luminance portion. The digitized samples are stored in two sections of RAM (11, 13) under the control of a write address generator (25) and two respective write control circuits (14,17). The ADC(6) operates at 4.sub.fsc and has a resolution of 7 bits while the ADC(9) operates at one sixteenth of that rate and has a resolution of 10 bits. This enables a full 10 bit resolution to be obtained without requiring a high cost ADC.

REFERENCES:
patent: 4218700 (1980-08-01), Kashigi
patent: 4531149 (1985-07-01), Lewis
patent: 4549201 (1985-10-01), Tanaka

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