Detection method of low frequency handshaking signal
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United States of America Patent
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Oct 7, 2014
Grant Date -
May 17, 2012
app pub date -
Feb 22, 2011
filing date -
Nov 16, 2010
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Abstract
A detection method of low frequency handshaking signal is described. The method includes the following steps of: (a) performing first impedance calibration when host device is activated for sending a first low frequency signal based on the first impedance calibration and performing a second impedance calibration when a controlled device is activated for sending a second low frequency signal based on the second impedance calibration; (b) transmitting a first high frequency training signal from the host device to the second receiver of the controlled device when the first low frequency signal and the second low frequency signal are in a predetermined condition; and (c) transmitting a second high frequency training signal from the controlled device to the first receiver of the host device wherein the frequency of the first low frequency signal and the second low frequency signal is smaller than the frequency of the first high frequency training signal and the second high frequency training signal.
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