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Patent Searching and Data


Title:
POINT CONTROL TYPE SIGNAL SELECTING SYSTEM
Document Type and Number:
Japanese Patent JP2000238640
Kind Code:
A
Abstract:

To increase in information amount for controlling a train with simple constitution, and contrive the improvement of adjusting work for an instrument and noise proofness.

In this system, a signal level of a frequency (fi) out of frequency sweep signals of frequencies (f0)-(fn) output from a secondary side coil in an on-train element 3 gets great when the element 3 is coupled electromagnetically with a ground element of the resonance frequency (fi) to resonate. A phase discriminating circuit 51 demodulates the frequency sweep signal input from the secondary side coil of the element 3 to output a demodulated signal of the frequency (fi). A band-pass filter 52 removes a noise component of the demodulated signal. A direct current voltage transforming circuit 53 transforms the noise component-removed demodulated signal into a direct current voltage in response to the frequency (fi). An operation circuit 54 determines a level of the direct current voltage and a value of a frequency counter to select the ground element 2 of the resonance frequency (fi).


Inventors:
NAGUMO TOMOHIRO
Application Number:
JP4419999A
Publication Date:
September 05, 2000
Filing Date:
February 23, 1999
Export Citation:
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Assignee:
KYOSAN ELECTRIC MFG
International Classes:
B61L3/12; (IPC1-7): B61L3/12
Attorney, Agent or Firm:
Toshiro Kojima