Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1991-01-29
1993-06-29
Chin, Tommy P.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358330, 360 27, 360 30, H04N 576
Patent
active
052239454
ABSTRACT:
A recording mode discriminating circuit corresponding to reproduced signals of first and second recording modes in which a carrier frequency of frequency-modulated luminance signal becomes high and low includes a first bandpass filter using an upper side band wave frequency of the first recording mode as a central frequency thereof, a second bandpass filter using a predetermined carrier frequency of the second recording mode as a central frequency thereof, a discharge control circuit for flowing or interrupting a current of a first predetermined value in response to the presence or absence of the first bandpass filter when the reproduced signals are supplied, a charge and discharge control circuit for flowing or interrupting a current of a second predetermined value smaller than the first predetermined value in response to the presence or absence of the output of the second bandpass filter, and a capacitor commonly connected to the discharging circuit and the charging and discharging circuit, wherein the recording modes of the reproduced signals are discriminated on the basis of a voltage across the capacitor. Also, there is a magnetic recording and reproducing apparatus, to which the above-mentioned recording mode discriminating circuit can be suitably applied.
REFERENCES:
patent: 4786986 (1988-11-01), Yamanushi et al.
patent: 4963991 (1990-10-01), Honjo
patent: 5113265 (1992-05-01), Kobayashi et al.
Hirai Jun
Honda Takashi
Chin Tommy P.
Eslinger Lewis H.
Maioli Jay H.
Sony Corporation
Tran Thai
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