System for transmitting color television signals that contain a

Details System for transmitting color television signals that contain a System for transmitting color television signals that contain a

1993-05-05

1995-12-26

Harvey, David E.

Television

Image signal processing circuitry specific to television

Transition or edge sharpeners

348625, H04N 968, H04N 964

Patent

active

054792169

ABSTRACT:
Inserted in the transmission path (10) for transmitting a color signal of a color television signal is a signal switcher (12) with at least three switch positions (12a, 12b, 12c), the end positions of which are connected to the output (11.2) and input (11.1), respectively, of a delay line (11) contained in the transmission path. Connected to the transmission path (8) of the luminance signals is an edge detection arrangement (24) which, when a signal edge is detected in the luminance signal, generates a detection signal that oscillates about a zero line and has a zero crossing at the detection time, and controls the signal switcher in such a way that an associated color signal edge of the color signal, which has a steep slope and occurs at the point in time of the signal edge of the luminance signal, is transmitted. In the absence of detection of a signal edge, portions of both the undelayed and the delayed color signal are transmitted to the signal output (12.3) of the signal switcher.

REFERENCES:
patent: Re34176 (1993-02-01), Skinner et al.
patent: 4739395 (1988-04-01), Johanndeiter et al.
patent: 4758891 (1988-07-01), Hitchcock et al.
patent: 4980755 (1990-12-01), Ozaki
patent: 5053865 (1991-10-01), Ubukata
patent: 5159442 (1992-10-01), Mizuta
"TDA4670 Picture Signal Improvement (PSI) circuit" by Peter Kelting, Electronic Components &-Applications, vol. 10, No. 1, pp. 37-47.

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