Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1989-03-15
1991-09-10
Shepperd, John W.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358 31, 358 36, H04N 980, H04N 978
Patent
active
050478664
ABSTRACT:
A luminance and chrominance signal separation circuit for use in a video tape recorder wherein in the recording mode a three-line comb filter is made to be an adaptive type comb filter for separating a luminance signal from a chrominance signal and in the playback mode the comb filter is made to eliminate residual chrominance signal components in the luminance signal. Switching circuits are provided in the invention to permit the switching of the luminance and chrominance signal separation circuit between recording and playback modes and noise reduction is accomplished by a feedback line correlation circuit.
REFERENCES:
patent: 4072984 (1978-02-01), Kaiser
patent: 4167021 (1979-09-01), Holmes
patent: 4688080 (1987-08-01), Wagner
patent: 4703342 (1987-10-01), Takahashi
patent: 4807049 (1989-02-01), Fukuda
patent: 4809085 (1989-02-01), Funahashi
patent: 4855815 (1989-08-01), Yasuki et al.
Maxemchuk et al., Separation of NTSC Signals by Minimum Mean Square Error Filters and Adaptive Filters, IEEE Transactions on Communications, vol. COM-26, No. 5, May 1978, pp. 583-593.
"Videocom", Jul. 1987, pp. 53-57 (no translation).
Aizawa Toshiro
Kuroyanagi Tomomitsu
Masuda Michio
Watanabe Katsuyuki
Yoshioka Atsushi
Hitachi , Ltd.
Shepperd John W.
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