FILTER CIRCUIT FOR ELECTROMAGNETIC PICKUP

PURPOSE:To obtain a filter circuit for an electromagnetic pickup, whose S/N ratio is not deteriorated even if the frequency of a low-frequency noise is increased together with a detected rotation signal, and which can generate the filter output signal high in resolution all the time. CONSTITUTION:A...

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Bibliographic Details
Main Author SHINJIYOU IZURU
Format Patent
LanguageEnglish
Published 23.04.1993
Subjects
BASIC ELECTRONIC CIRCUITRY
ELECTRICITY
IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS
INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
MEASURING
MEASURING ANGLES
MEASURING AREAS
MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS
MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION,OR SHOCK
PHYSICS
PULSE TECHNIQUE
RESONATORS
TESTING
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Summary:PURPOSE:To obtain a filter circuit for an electromagnetic pickup, whose S/N ratio is not deteriorated even if the frequency of a low-frequency noise is increased together with a detected rotation signal, and which can generate the filter output signal high in resolution all the time. CONSTITUTION:A high-pass filter 3 is constituted of a plurality of circuit elements 32-34, which are connected in parallel one another, and switching means SW1 and SW2, which are connected to at least one of the circuit elements in series and are opened and closed in response to the voltage value of the detected rotation signal Vi. The cutoff frequency of the high-pass filter is switched so that the cutoff frequency is increased in response to the increase in voltage value of the detected rotation signal.
Bibliography:Application Number: JP19910257610