Control apparatus of a real time counter for a video cassette recorder
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United States of America Patent
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Sep 14, 1999
Issued Date -
N/A
app pub date -
Sep 4, 1997
filing date -
Dec 30, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A control apparatus of a real time counter for a video cassette recorder. This apparatus comprises a CLOG detection section having an envelope detector, a comparator, and a low-pass filter for detecting a CLOG signal to judge whether a signal exists on the videotape; an ATF detection section having an ATF detector, an analog-to-digital converter, a band comparator, a shift register, and a state detector for detecting an automatic track following signal, an AND gate for performing a logical product between the CLOG signal and the automatic track following signal and an REC instruction; and a counting section having a switch which is for controlling a real time counter using the output, or a control signal of the AND gate. This apparatus accomplishes the accurate control of a counting by using an automatic track following signal as well as the CLOG signal.
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