Dropout detecting apparatus

Details Dropout detecting apparatus Dropout detecting apparatus

1989-10-23

1992-06-30

Envall, Jr., Roy N.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358342, 360 381, H04N 594

Patent

active

051268531

ABSTRACT:
A dropout detecting apparatus includes a high-frequency-range compensation circuit for emphasizing a signal component in a high-frequency-range of a reproduced high-frequency signal, a reference signal generating circuit for deriving a reference signal from the reproduced high-frequency signal. The reference signal has an inverse relationship to the reproduced high-frequency having the emphasized signal component supplied from the high-frequency-range compensation circuit. The apparatus further includes a pulse signal generating circuit for converting the reproduced high-frequency signal supplied from the high-frequency-range compensation circuit into a pulse signal on the basis of the reference signal supplied from the reference signal generating circuit, and a circuit for determining whether the reproduced high-frequency signal includes a dropout on the basis of a change in period of the pulse signal supplied from the pulse signal generating circuit and for outputting a dropout detection signal.

REFERENCES:
patent: 3912858 (1975-10-01), Kenney
patent: 4158855 (1979-06-01), Thomas et al.
patent: 4376289 (1983-03-01), Reitmeier et al.
patent: 4737723 (1988-04-01), Mita
patent: 4803677 (1989-03-01), Yamaguchi et al.
patent: 4805040 (1989-02-01), Oku et al.
patent: 4835758 (1989-05-01), Fujushima
patent: 4847709 (1989-07-01), Uehara et al.
patent: 4893129 (1990-01-01), Takemura
patent: 4951154 (1990-08-01), Sekiguchi et al.

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