Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1987-04-20
1989-04-11
Britton, Howard W.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 35, 358 21R, 358174, H04N 9535
Patent
active
048210870
ABSTRACT:
Disclosed is an encoder circuit for converting a color difference signa into a carrier chrominance signal for use in a component VTR, camera, etc. The color difference signal is clamped by an automatic clamper, and then, this signal is used for balanced-modulating a color subcarrier whereby a first balanced-modulated output is obtained. Then, within a conversion circuit receiving the color subcarrier and the first balanced-modulated output as inputs thereto, a carrier leak existing in a predetermined period of the first balanced-modulated output is converted to D.C. levels changing at predetermined intervals. Here, the changes of the D.C. levels are such that their polarities aare inverted at the predetermined intervals with respect to a D.C. level appearing when no carrier leak exists. A difference between the D.C. levels changing at the predetermined intervals is detected, and a feedback loop is formed for controlling the D.C. level in the automatic clamper using the detected difference. Thus, an encoder circuit eliminating a carrier leak is realized.
REFERENCES:
patent: 4122492 (1978-10-01), Gallo
patent: 4434439 (1984-02-01), Steckler et al.
patent: 4500931 (1985-02-01), Taguchi et al.
Britton Howard W.
Kostak Victor R.
Matsushita Electric - Industrial Co., Ltd.
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