Telecommunications – Receiver or analog modulated signal frequency converter – Local control of receiver operation
Reexamination Certificate
2005-05-20
2008-07-01
Urban, Edward (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Local control of receiver operation
C455S180300, C455S326000, C455S339000, C324S118000
Reexamination Certificate
active
07395044
ABSTRACT:
A measuring apparatus employing a differential transformer includes a high-frequency oscillator which generates a high-frequency signal having a frequency higher than the excitation frequency of the differential transformer, a frequency divider which divides the high-frequency signal to generate a driving signal for the differential transformer, a multiplier or divider which reduces the frequency of the high frequency signal by the frequency of the driving signal, a mixer which mixes the output from the multiplier or the divider with the output from the differential transformer, a high-pass filter or a band-pass filter which cuts a low-frequency component of the output from the mixer, and a double balanced mixer which synchronously detects the output from the high-pass filter or the band-pass filter with the use of the high-frequency signal. With the use of the thus configured apparatus, an output signal having a fast response speed can be obtained through the use of an existing head having a low excitation frequency.
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Le Nhan T.
Mitutoyo Corporation
Urban Edward
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