JPS524195A - Fire and crime prevention apparatus utilizing catv transmission lines - Google Patents

Fire and crime prevention apparatus utilizing catv transmission lines

Info

Publication number
JPS524195A
JPS524195A JP8026675A JP8026675A JPS524195A JP S524195 A JPS524195 A JP S524195A JP 8026675 A JP8026675 A JP 8026675A JP 8026675 A JP8026675 A JP 8026675A JP S524195 A JPS524195 A JP S524195A
Authority
JP
Japan
Prior art keywords
transmission lines
fire
catv transmission
crime prevention
prevention apparatus
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.)
Pending
Application number
JP8026675A
Other languages
Japanese (ja)
Inventor
Kazuo Murayama
Kazuo 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.)
Sumitomo Electric Industries Ltd
Original Assignee
Sumitomo Electric Industries 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 Sumitomo Electric Industries Ltd filed Critical Sumitomo Electric Industries Ltd
Priority to JP8026675A priority Critical patent/JPS524195A/en
Publication of JPS524195A publication Critical patent/JPS524195A/en
Pending legal-status Critical Current

Links

Landscapes

  • Alarm Systems (AREA)
  • Fire Alarms (AREA)

Abstract

PURPOSE: A capacitor cutting-off low frequencies but permitting high frequencies to pass therethrough is inserted between a directional coupler and a distributing circuit of a tap off apparatus distributed on CATV transmission lines. The apparatus is operable at all times without affecting high frequency signals.
COPYRIGHT: (C)1977,JPO&Japio
JP8026675A 1975-06-27 1975-06-27 Fire and crime prevention apparatus utilizing catv transmission lines Pending JPS524195A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8026675A JPS524195A (en) 1975-06-27 1975-06-27 Fire and crime prevention apparatus utilizing catv transmission lines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8026675A JPS524195A (en) 1975-06-27 1975-06-27 Fire and crime prevention apparatus utilizing catv transmission lines

Publications (1)

Publication Number Publication Date
JPS524195A true JPS524195A (en) 1977-01-13

Family

ID=13713492

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8026675A Pending JPS524195A (en) 1975-06-27 1975-06-27 Fire and crime prevention apparatus utilizing catv transmission lines

Country Status (1)

Country Link
JP (1) JPS524195A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59160296A (en) * 1983-03-03 1984-09-10 マスプロ電工株式会社 Information transmitting system utilizing tv common reception line

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4877792A (en) * 1972-01-20 1973-10-19

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4877792A (en) * 1972-01-20 1973-10-19

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59160296A (en) * 1983-03-03 1984-09-10 マスプロ電工株式会社 Information transmitting system utilizing tv common reception line

Similar Documents

Publication Publication Date Title
JPS5260514A (en) Tuner
JPS5259512A (en) Tuner
JPS52125301A (en) Signal processing circuit
JPS5390857A (en) Magnetron device
JPS5375818A (en) Signal transmission device
JPS5230302A (en) Radio receiver
JPS5317252A (en) Ssb modulator and demodulator
JPS523334A (en) Tv broadcasting system
JPS5211717A (en) Television signal amplifier
JPS5237705A (en) Tuner unit of television receiver
JPS51142998A (en) Alarm systems
JPS51132913A (en) Frequency conversion apparatus
JPS5220719A (en) Television system
JPS54134526A (en) Terminal equipment
JPS5373910A (en) Television signal digital transmission system
JPS53137626A (en) Delay circuit for video signal
JPS5233411A (en) Automatic equalizing system in a wire broadcast equipment
JPS5233424A (en) Trap device
JPS5226113A (en) Block pattern transmission system
JPS5220752A (en) Amplitude phase modulation signal receiver
JPS527615A (en) Mudulation indicator circuit
JPS52127027A (en) Television signal transmission sysem
JPS51132723A (en) Receiver of multiplex television signal
JPS5213644A (en) Receiver of the power line transmission communicating device
JPS5361908A (en) Circuit connection system