AUTOMATIC ADJUSTMENT DEVICE FOR TRACKING FILTER AND RECEIVER USING SAME

WIPO Patent Application WO/2013/027318

A1

This automatic adjustment device for a tracking filter has: a tracking filter which has a capacitor circuit which has a variable capacitance corresponding to a filter control signal so as to pass, from the received signal, the component within the passband in order to output the same; a level measurement unit which measures the amplitude of the signal which has passed through the tracking filter so as to output the same; and a control unit which generates a filter control signal. The control unit generates the filter control signal and performs interpolation so that, for each of a plurality of different target frequencies, the difference between a first signal level which is output by the level measurement unit when a test signal of a first frequency is being generated which is lower by a predetermined frequency than the target frequency, and a second signal level which is output by the level measurement unit when a test signal is being generated which is of a second frequency which is higher by a predetermined frequency than the target frequency, is less than or equal to a predetermined threshold. Accordingly, the center frequency of the tracking filter can be made to approximate the target frequency in a shorter period of time.

TSUKAMOTO SATOSHI
KURIMOTO HIDEHIKO
OBA YASUO

PCT/JP2012/004083

February 28, 2013

June 25, 2012

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PANASONIC CORP (JP)
TSUKAMOTO SATOSHI
KURIMOTO HIDEHIKO
OBA YASUO

H04B1/10; H03H7/01; H04B1/16

JPH04145728A	1992-05-19
JP2008098730A	2008-04-24
JPH0629878A	1994-02-04
JP2007174367A	2007-07-05
JP2009100364A	2009-05-07
JPH10276110A	1998-10-13
JP2003249863A	2003-09-05
JP2011023870A	2011-02-03

NAITO, Hiroki et al. (JP)
Hiroki Naito (JP)

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