Method for effectively filtering same frequency signal interference from electronic whiteboard system

The invention relates to a method for effectively filtering same frequency signal interference from an electronic whiteboard system. The method comprises the following steps: firstly, storing a to-be-processed signal by a temporary storage; performing wave form conversion on the signal by a preproce...

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Bibliographic Details
Main Authors HUANG YULAN, CHEN JIAN, YAN XUEZHI, SUN XIAOYING, SONG SHUTING, WANG BO, WEN QUAN
Format Patent
LanguageChinese
English
Published 09.01.2013
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Summary:The invention relates to a method for effectively filtering same frequency signal interference from an electronic whiteboard system. The method comprises the following steps: firstly, storing a to-be-processed signal by a temporary storage; performing wave form conversion on the signal by a preprocessor; sending the signal after being converted to a wave form detector; performing enveloping extraction on the signal by the wave form detector; transferring an extracted result to a breakpoint position searcher; extracting a breakpoint position and utilizing a threshold comparator to correct the breakpoint position by the breakpoint position searcher; and starting to restore the wave form from the breakpoint by a wave form restorer, so as to filter the interference signal. The method provided by the invention is suitable for various panels with varying same frequency interference, has the advantages of low cost and strong instantaneity and is applied to an ultrasonic positioning electronic whiteboard system.
Bibliography:Application Number: CN20121306022