Secondary beat signal cancel circuit

Details Secondary beat signal cancel circuit Secondary beat signal cancel circuit

1987-06-16

1991-03-05

Psitos, Aristotelis M.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358315, 360 341, H04N 979

Patent

active

049981722

ABSTRACT:
A magnetic reproducing apparatus is provided with an improved secondary beat signal cancel circuit for reducing a secondary beat signal of a low-frequency converted chroma signal leaked into a reproduced luminance signal without deteriorating vertical resolution at the edge of an oblique check signal. The secondary beat signal cancel operation is interrupted during a period in which no vertical correlation exists between the edge portions of two succeeding horizontal lines of the oblique check signal.

REFERENCES:
patent: 3626087 (1971-12-01), Tomioka
patent: 3660596 (1972-05-01), Numakura
patent: 3715468 (1973-02-01), Fujita
patent: 3728475 (1973-04-01), Inoue et al.
patent: 3730983 (1973-05-01), Numakura et al.
patent: 3893168 (1975-07-01), Bechly et al.
Hobbs, M., Servicing Home Video Cassette Recorders, 1982, pp. 31-41.
Sony Basic Video Recording Cource, Tape Formats, 1979, pp. 3-6 and 10-11.

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