Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
September 12, 2006
Patent Application Number
10975601
Date Filed
October 28, 2004
Patent Primary Examiner
Patent abstract
A method of eliminating unnecessary frequency components using a quadrature detector. The method includes converting an analog input signal into a digital signal f1(t), and the signal f1 (t) is delayed by a sampling time τ to form a signal f2 (t). Then, letting the reference frequency be ω0, the I- and Q-components in quadrature detection by the following expression:I={f2(t)*sin ω0t−f1(t)*sin ω0(t−τ)}/sin ω0τQ={f2(t)*cos ω0t−f1(t)*cos ω0(t−τ)}/sin ω0τ.
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