Television – Image signal processing circuitry specific to television
Patent
1994-11-01
1996-05-28
Groody, James J.
Television
Image signal processing circuitry specific to television
348705, 348500, 348521, H04N 514, H04N 964
Patent
active
055216471
ABSTRACT:
An integrated circuit device for processing an image signal has an inexpensive structure and an excellent signal processing characteristic. The integrated circuit device (3) formed on one integrated circuit substrate comprises a switch circuit (4), a separator circuit (8) and preamp circuits (5) to (7). The separator circuit (8) has an input terminal which has an input impedance which is sufficiently higher than an output impedance of the switch circuit (4). Receiving an output of the switch circuit (4) at such an input terminal, the separator circuit (8) filters off high-frequency components including the maximum frequency of the image signal and outputs signal components which belong to a frequency band which is related to a synchronization signal. The preamp circuits (5) to (7) amplify and output image signals which are outputted by the switch circuit (4). Having a high input impedance, the separator circuit (8) supplies image signals to the preamp circuits (5) to (7) without deteriorating the maximum frequency of the image signals. It is also possible to lower the frequency of a signal which is outputted at an output terminal 3p and hence to prevent disturbance to outside.
REFERENCES:
patent: 4638181 (1987-01-01), Deiss
National Semiconductor Company, Sep. 1991, "LM1204 150 MHz RGB Video Amplifier System", pp. 13-14.
Groody James J.
Mitsubishi Denki & Kabushiki Kaisha
West Nina N.
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