Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1985-04-12
1987-09-22
McElheny, Jr., Donald
Facsimile and static presentation processing
Facsimile
Recording apparatus
358327, H04N 979
Patent
active
046959009
ABSTRACT:
A magnetic recording and playback apparatus for teletext signals which accurately records and reproduces the teletext signal superposed within the vertical blanking period of television signal, includes at least one wide band filter, at least one narrow band filter, a filter selection switch which switches at least one filter for a luminance signal processing system to the wide band filter and at least one filter for a chrominance signal processing system to the narrow band filter, and a control circuit which generates a control signal for controlling the filter selection switch. The control circuit generates the control signal only during a specified period where the teletext signal is superposed. In case a comb filter is used, a switch is provided for selectively passing an output of the comb filter and an input video signal to the succeeding stages and a control circuit for producing a control signal to allow the input video signal to pass during a specified period where the teletext signal is superposed.
REFERENCES:
patent: 4479150 (1984-10-01), Ilmer et al.
patent: 4532540 (1985-07-01), Wine
Hashima Akio
Honjo Masahiro
Matsushita Electric - Industrial Co., Ltd.
McElheny Jr. Donald
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