Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1988-02-08
1988-10-25
Heyman, John S.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307351, 307358, 328162, 328163, 328164, 328165, H03K 501, H03K 5153, H03B 100
Patent
active
047806230
ABSTRACT:
A contour compensating circuit is disclosed for compensating a video signal in such a manner as to obtain contour portions which are not overly stressed. The compensating operation of the contour compensating circuit according to this invention is performed by obtaining a full-wave rectified signal of the primary differentiated signal of a video signal and the positive- and negative-phase signals of a secondary differentiated signal thereof and forming a secondary pseudo-differentiated signal with a narrow pre and post overshooting width range from the signals obtained by selecting a first higher level signal between the full-wave rectified signal and one of the positive-phase signal and the half-wave signal thereof identical in porality with the full-wave signal, selecting a second higher level signal between the full-wave rectified signal and one of the negative-phase signal and the half-wave signal thereof identical in porality with the full-wave signal and comparing the first and second higher level signals, half-wave signal and the full-wave rectified signal. The resulting signal is superposed on the video signal.
Heyman John S.
Phan Trong Quang
Pioneer Electronic Corporation
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