Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1984-11-27
1987-04-07
Masinick, Michael A.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 37, H04N 978
Patent
active
046565027
ABSTRACT:
The luminance signal is connected to a transmission channel which includes a subtraction circuit (3) and a branch circuit, to apply a subtraction signal to the subtraction circuit. The branch circuit includes a band-pass filter connected to receive the luminance signal and a controlled amplifier (5) serially connected with a band-pass filter. The branch circuit is additionally connected to a circuit to derive the control signal for the controlled amplifier, the control signal being obtained from a control signal generating circuit which generates the control signal as a function of the portion of the luminance signal which is within the band-pass width of the chrominance subcarrier. The signal can be obtained, for example, by forming a level signal representative of the luminance components based on the color difference signals; and/or by synchronous demodulation of the luminance signal with respect to the chrominance subcarrier; and/or by a comb filter.
REFERENCES:
patent: 4263612 (1981-04-01), Gibson
patent: 4348689 (1982-09-01), Achiha
patent: 4570177 (1986-02-01), Kondo
Masinick Michael A.
Robert & Bosch GmbH
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