Title:
RELATIVE PHASE DETECTOR, RELATIVE PHASE DETECTING METHOD AND INFORMATION READING DEVICE
Document Type and Number:
WIPO Patent Application WO/2010/116918
Kind Code:
A1
Abstract:
The relative phases of two signals to be measured with a predetermined frequency spacing therebetween are detected using two reference signals.
A relative phase detector (1) is provided with a reference signal generation unit (11) for generating two reference signals with the same frequency spacing as the frequency spacing between the two signals to be measured, a beat signal processing unit (12) for generating two beat signals from the two signals to be measured and the two reference signals and generating a multiplication signal of the two beat signals, and a detection unit (13) for detecting the relative phases of the two signals to be measured by removing a constant defined by a detection system from a direct-current component of the multiplication signal.
Inventors:
SHIODA Tatsutoshi (Kamitomioka-cho Nagaoka -sh, Niigata 88, 〒9402188, JP)
Application Number:
JP2010/055619
Publication Date:
October 14, 2010
Filing Date:
March 29, 2010
Export Citation:
Assignee:
National University Corporation Nagaoka University of Tchnology (1603-1, Kamitomioka-cho Nagaoka-sh, Niigata 88, 〒9402188, JP)
国立大学法人長岡技術科学大学 (〒88 新潟県長岡市上富岡町１６０３－１ Niigata, 〒9402188, JP)
国立大学法人長岡技術科学大学 (〒88 新潟県長岡市上富岡町１６０３－１ Niigata, 〒9402188, JP)
International Classes:
G01J9/02
Attorney, Agent or Firm:
KUBOTA Chikashi (1710, White Tower Hamamatsucho 13-2, Hamamatsucho 1-chome, Minato-k, Tokyo 13, 〒1050013, JP)
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