Title:
NAVIGATION DEVICE
Document Type and Number:
Japanese Patent JP2006322859
Kind Code:
A
Abstract:
To provide a pulse input circuit and an anomalous pulse removal method for removing pulses anomalously caused by tire idling, etc. to accurately calculate a moving speed and moving distance.
A variable characteristic filter is provided in a wheel speed pulse input circuit of this navigation device, with a characteristic set therein which is selected corresponding to the traveling speed of an automobile. The moving distance or moving speed is found based on pulses input via the filter.
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Inventors:
SHINODA TAKASHI
Application Number:
JP2005147431A
Publication Date:
November 30, 2006
Filing Date:
May 20, 2005
Export Citation:
Assignee:
HCX KK
International Classes:
G01C22/00
Attorney, Agent or Firm:
Yukihiko Takada
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