Title:
POLARITY JUDGING DEVICE
Document Type and Number:
Japanese Patent JP2953908
Kind Code:
B2
Abstract:
PURPOSE: To lessen malfunction of polarity judging operation when a received field is low in a polarity judging device of a reference signal transceiving system.
CONSTITUTION: A reference signal S2 for judging the position and running direction is sampled with the same frequency as the frequency thereof by respective sampling circuit 1C, 2C. In this case, the frequencies of respective sampling pulses SP1, SP2 are shifted by a half period of the signal S2. Thus, the signal S2 is sampled with double the frequency. The respective sampling values X1, X2 are supplied to a polarity judging circuit 5C. Thus, according to the combination of sampling values X1, X2, the polarity of the signal S2 is judged.
Inventors:
OORA HIDETO
Application Number:
JP10532793A
Publication Date:
September 27, 1999
Filing Date:
May 06, 1993
Export Citation:
Assignee:
OKI DENKI KOGYO KK
International Classes:
G01S1/68; G08G1/09; (IPC1-7): G01S1/68; G08G1/09
Domestic Patent References:
| JP6317641A | ||||
| JP6289114A | ||||
| JP682541A | ||||
| JP5100002A | ||||
| JP540898A | ||||
| JP526998A | ||||
| JP526997A |
Other References:
特開 平６−６８３７８ＪＰ，Ａ）
Attorney, Agent or Firm:
Nobuyuki Kudo
Previous Patent: PRODUCTION OF GRADED GLASS AND JIG THEREFOR
Next Patent: ULTRASONIC FAT THICKNESS MEASURING DEVICE
Next Patent: ULTRASONIC FAT THICKNESS MEASURING DEVICE