Communication apparatus
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United States of America Patent
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Aug 19, 2014
Grant Date -
Jun 13, 2013
app pub date -
Dec 7, 2012
filing date -
Dec 9, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
An apparatus includes a direct-current direction detection unit configured to detect a change of direct-current direction on a telephone line through which the apparatus and an exchanger are coupled; a voltage change detection unit configured to detect a change of voltage on the line; a first control unit configured to transmit a reception completion signal to the exchanger when receiving telephone number; a first determination unit configured to determine whether polarity reversal of the line occurs in a period from reception of the telephone number to transmission of the reception completion signal; a second determination unit configured to determine whether the polarity reversal occurs in a period from transmission of the reception completion signal to reception of a calling signal; and a second control unit configured not to display the received telephone number on a display unit when the polarity reversal occurs in at least one of the periods.
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