Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1992-03-19
1993-12-28
Kostak, Victor R.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358155, H04N 508
Patent
active
052744523
ABSTRACT:
A horizontal synchronizing signal separator in accordance with the present invention comprises an activation signal generator, when subjected to a triggering operation, for generating an activation signal having a predetermined continuous ON time duration, a front edge detector for outputting either one of first and second start pulses according to states of a video synchronizing pulse signal and the activation signal, and a first timer for making timing of the activation signal substantially coincide with timing of a front edge of the video synchronizing pulse signal on the basis of a composite signal corresponding to a composition of the first and second output signals, whereby, even in the case of a missing pulse or pulses in the video synchronizing pulse signal, the missing pulses are corrected with less phase shift in horizontal synchronization. As a result, there can be solved such a problem that, when pulse missing takes place in an equalizing pulse signal of the video synchronizing pulse signal, this causes horizontal synchronization to be disturbed in one field.
REFERENCES:
patent: 4353091 (1982-10-01), Hoppe
patent: 4621288 (1986-11-01), Yamada
patent: 5034815 (1991-07-01), Shibayama
Kostak Victor R.
Matsushita Electric - Industrial Co., Ltd.
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