JPS5791474A - Electric field type human body detector - Google Patents

Electric field type human body detector

Info

Publication number
JPS5791474A
JPS5791474A JP55168918A JP16891880A JPS5791474A JP S5791474 A JPS5791474 A JP S5791474A JP 55168918 A JP55168918 A JP 55168918A JP 16891880 A JP16891880 A JP 16891880A JP S5791474 A JPS5791474 A JP S5791474A
Authority
JP
Japan
Prior art keywords
frequency
beat
higher harmonic
oscillator
announcing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP55168918A
Other languages
Japanese (ja)
Other versions
JPS603625B2 (en
Inventor
Yuji Takada
Hironobu Inoue
Hiroshi Ohashi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Electric Works Co Ltd
Original Assignee
Matsushita Electric Works Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Priority to JP55168918A priority Critical patent/JPS603625B2/en
Priority to IT8167033A priority patent/IT1210603B/en
Priority to SE8100184A priority patent/SE450673B/en
Priority to DE3100936A priority patent/DE3100936C2/en
Priority to DE3152533A priority patent/DE3152533C2/en
Priority to CA000368501A priority patent/CA1160314A/en
Priority to FR8100556A priority patent/FR2473764B1/en
Priority to AU66240/81A priority patent/AU542678B2/en
Priority to GB8101157A priority patent/GB2069206B/en
Publication of JPS5791474A publication Critical patent/JPS5791474A/en
Publication of JPS603625B2 publication Critical patent/JPS603625B2/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/26—Electrical actuation by proximity of an intruder causing variation in capacitance or inductance of a circuit

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Burglar Alarm Systems (AREA)

Abstract

PURPOSE:To eliminate the possibility of false announcing occuring due to higher harmonic noises generated synchronously with an electric power source completely by so constituting a titled detector that when a beat frequency is the cause for false announcing, the frequency of a detection signal is changed over. CONSTITUTION:When the frequency of higher harmonic noises approaches to a frequency f01 and beat frequencies are lowered to the extent that they can pass through a BPF6 while an oscillator 1a is generating the detection signal of the frequency f01, a beat frequency detecting circuit 1b detects this, and the circuit 1b emits a control signal to the oscillator 1a, thereby changing over the oscillation frequency to f02. Then, it results in that the signal frequency f02 positions approximately at the center of the adjacent higher harmonic noises, and the beat frequency goes relatively high as well and therefore this beat is blocked by the PBF6 and the occurrence of malfunction of a subsequent comparator 7 and an announcing circuit 8 is eliminated. In this case, when the frequency of the higher harmonic noises approaches to a signal frequency f02, the frequency of the oscillator 1a is similarly changed over from f02 to f01.
JP55168918A 1980-01-15 1980-11-28 Electric field human body detector Expired JPS603625B2 (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
JP55168918A JPS603625B2 (en) 1980-11-28 1980-11-28 Electric field human body detector
IT8167033A IT1210603B (en) 1980-01-15 1981-01-14 INTRUSION ALARM SYSTEM
SE8100184A SE450673B (en) 1980-01-15 1981-01-14 Alert system, to indicate a person's presence in a given area
DE3100936A DE3100936C2 (en) 1980-01-15 1981-01-14 Intruder warning system
DE3152533A DE3152533C2 (en) 1980-01-15 1981-01-14 Intruder warning system
CA000368501A CA1160314A (en) 1980-01-15 1981-01-14 Intrusion warning system
FR8100556A FR2473764B1 (en) 1980-01-15 1981-01-14 INTRUSION ALARM SYSTEM
AU66240/81A AU542678B2 (en) 1980-01-15 1981-01-15 Intrusion warning system
GB8101157A GB2069206B (en) 1980-01-15 1981-01-15 Instrusion warning systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55168918A JPS603625B2 (en) 1980-11-28 1980-11-28 Electric field human body detector

Publications (2)

Publication Number Publication Date
JPS5791474A true JPS5791474A (en) 1982-06-07
JPS603625B2 JPS603625B2 (en) 1985-01-29

Family

ID=15876965

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55168918A Expired JPS603625B2 (en) 1980-01-15 1980-11-28 Electric field human body detector

Country Status (1)

Country Link
JP (1) JPS603625B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6050475A (en) * 1983-08-31 1985-03-20 Matsushita Electric Works Ltd Electric field type human body detector

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6050475A (en) * 1983-08-31 1985-03-20 Matsushita Electric Works Ltd Electric field type human body detector

Also Published As

Publication number Publication date
JPS603625B2 (en) 1985-01-29

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