Television signal processing apparatus for separating an auxilia

Details Television signal processing apparatus for separating an auxilia Television signal processing apparatus for separating an auxilia

1993-04-15

1993-12-14

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358141, 358140, 358168, H04N 700, H04N 1100, H04N 708, H04N 516

Patent

active

052708179

ABSTRACT:
In the television broadcasting system called letter box method, it is proposed to transmit an image having a larger aspect ratio than that of the existing broadcasting system by using some of the scanning lines of the existing broadcasting system, and transmit some additional information signal in the remaining portion. An offset value applied to the additional information signal at the transmission side must be removed completely at the reception side. Accordingly, at the reception side, in the scanning line in which an offset reference signal indicative of the offset value is transmitted, the offset reference value and a DC level reference value of the scanning line are detected, and these values are retained until a next offset reference signal is detected. By detecting a DC level of a scanning line containing the additional information signal, a difference from the DC level reference value previously detected and retained is obtained, and the offset reference value detected and retained previously is corrected by this difference. Thus obtained offset value is subtracted from the transmitted additional information signal.

REFERENCES:
patent: 4143398 (1979-03-01), Harwood et al.
patent: 4660084 (1987-04-01), Filliman et al.
patent: 4984078 (1991-01-01), Skinner et al.
patent: 5075773 (1991-12-01), Pullen et al.
patent: 5208668 (1993-05-01), Dirsel et al.
patent: 5208670 (1993-05-01), Sugimori et al.

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