Display device

An object is to eliminate the effect of jitter in a sampling clock to realize proper sampling of a video signal. An A/D converter (1) samples a video signal in synchronization with a sampling clock (VCLK) at a rate of a period which is ½ times the video period. The phase of the sampling clock (VCLK)...

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Hauptverfasser: MURAKAMI YASUO, HARA KOUICHIROU
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creator MURAKAMI YASUO
HARA KOUICHIROU
description An object is to eliminate the effect of jitter in a sampling clock to realize proper sampling of a video signal. An A/D converter (1) samples a video signal in synchronization with a sampling clock (VCLK) at a rate of a period which is ½ times the video period. The phase of the sampling clock (VCLK) is corrected in a phase correcting circuit (9). The sampled signals are held alternately as data (DL) and (DR) in two latches (14) (15). A data switching portion (16) selects output signals from one of the two latches (14) and (15). A calculating portion (21) calculates an absolute difference value (DeltaD) between the data (DL) and (DR) in each video period. A calculating portion (22) calculates a maximum value (Dmax) among the absolute difference values (DeltaD) in one frame. A phrase control portion (19) controls the phase correcting circuit (9) and the data switching portion (16) so that a video signal processing circuit (2) can receive sampled signals which are sampled signals which are sampled at a phase corresponding to the center of a rising transition which the maximum value (Dmax) makes as the phase varies.
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The phase of the sampling clock (VCLK) is corrected in a phase correcting circuit (9). The sampled signals are held alternately as data (DL) and (DR) in two latches (14) (15). A data switching portion (16) selects output signals from one of the two latches (14) and (15). A calculating portion (21) calculates an absolute difference value (DeltaD) between the data (DL) and (DR) in each video period. A calculating portion (22) calculates a maximum value (Dmax) among the absolute difference values (DeltaD) in one frame. A phrase control portion (19) controls the phase correcting circuit (9) and the data switching portion (16) so that a video signal processing circuit (2) can receive sampled signals which are sampled signals which are sampled at a phase corresponding to the center of a rising transition which the maximum value (Dmax) makes as the phase varies.</description><edition>7</edition><language>eng</language><subject>ADVERTISING ; ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICESUSING STATIC MEANS TO PRESENT VARIABLE INFORMATION ; AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATIONOF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES ; BASIC ELECTRONIC CIRCUITRY ; CRYPTOGRAPHY ; DISPLAY ; EDUCATION ; ELECTRIC COMMUNICATION TECHNIQUE ; ELECTRICITY ; PHYSICS ; PICTORIAL COMMUNICATION, e.g. TELEVISION ; SEALS</subject><creationdate>2004</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&amp;date=20040203&amp;DB=EPODOC&amp;CC=US&amp;NR=6686969B1$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,776,881,25542,76289</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&amp;date=20040203&amp;DB=EPODOC&amp;CC=US&amp;NR=6686969B1$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>MURAKAMI YASUO</creatorcontrib><creatorcontrib>HARA KOUICHIROU</creatorcontrib><title>Display device</title><description>An object is to eliminate the effect of jitter in a sampling clock to realize proper sampling of a video signal. 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subjects ADVERTISING
ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICESUSING STATIC MEANS TO PRESENT VARIABLE INFORMATION
AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATIONOF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
BASIC ELECTRONIC CIRCUITRY
CRYPTOGRAPHY
DISPLAY
EDUCATION
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
PHYSICS
PICTORIAL COMMUNICATION, e.g. TELEVISION
SEALS
title Display device
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