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PROBLEM TO BE SOLVED: To obtain a field discrimination circuit that generates a stable field signal by detecting a total dot clock number for a horizontal period with a horizontal synchronizing signal and a dot clock signal to generate a horizontal pulse signal for field discrimination. SOLUTION: A...

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Bibliographic Details
Main Author SAKANISHI YASUAKI
Format Patent
LanguageEnglish
Published 11.08.2000
Edition7
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
PICTORIAL COMMUNICATION, e.g. TELEVISION
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Summary:PROBLEM TO BE SOLVED: To obtain a field discrimination circuit that generates a stable field signal by detecting a total dot clock number for a horizontal period with a horizontal synchronizing signal and a dot clock signal to generate a horizontal pulse signal for field discrimination. SOLUTION: A horizontal address generating section 4 generates a horizontal address signal. A horizontal dot number detection circuit 10 receives this horizontal address signal to hold the address signal with a reference edge of a horizontal synchronizing signal 1 thereby detecting a total dot clock number for one horizontal period. Address data equally dividing the horizontal synchronizing signal are calculated by using the horizontal synchronizing signal 1 and a clock signal from the total dot clock number for the one horizontal period. A horizontal pulse signal required to detect an edge of a vertical synchronizing signal is generated from the data to discriminate a vertical reference edge and to obtain a field signal even when a horizontal frequency division ratio of an input signal is unknown.
Bibliography:Application Number: JP19990021914