JPS6455990A - Interphone system with monitor television - Google Patents

Interphone system with monitor television

Info

Publication number
JPS6455990A
JPS6455990A JP21245487A JP21245487A JPS6455990A JP S6455990 A JPS6455990 A JP S6455990A JP 21245487 A JP21245487 A JP 21245487A JP 21245487 A JP21245487 A JP 21245487A JP S6455990 A JPS6455990 A JP S6455990A
Authority
JP
Japan
Prior art keywords
video signal
circuit
divisions
signal
equal
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
JP21245487A
Other languages
Japanese (ja)
Other versions
JP2660283B2 (en
Inventor
Akira Oya
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 JP62212454A priority Critical patent/JP2660283B2/en
Publication of JPS6455990A publication Critical patent/JPS6455990A/en
Application granted granted Critical
Publication of JP2660283B2 publication Critical patent/JP2660283B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Closed-Circuit Television Systems (AREA)
  • Audible And Visible Signals (AREA)

Abstract

PURPOSE:To obtain excellent video even in a counter light state by dividing an inputted video signal into three equal divisions in the vertical direction, extracting only the video signal in the central one of the three divisions, and smoothing the signal to make it a control signal for an illuminator device. CONSTITUTION:A window pulse generating circuit 2 generates window pulses T2 approximately equal to the width of the central one of the three divisions generated by dividing video signal components equal to one H length of a composite video signal (a). An averaging circuit 3 averages sampling signals taken out by the window pulses T2 and inputs them to an illumination control circuit 4. In the circuit 4, corresponding to an output from the averaging circuit 3 that depends on a video signal, controls the illuminance of the illuminator device 5. As a result, since the illumination is executed even in a counter light state, the confirming of a person through a monitor television is facilitated, and furthermore, the degree of freedom of installation location can be improved.
JP62212454A 1987-08-26 1987-08-26 Intercom system with monitor TV Expired - Fee Related JP2660283B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62212454A JP2660283B2 (en) 1987-08-26 1987-08-26 Intercom system with monitor TV

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62212454A JP2660283B2 (en) 1987-08-26 1987-08-26 Intercom system with monitor TV

Publications (2)

Publication Number Publication Date
JPS6455990A true JPS6455990A (en) 1989-03-02
JP2660283B2 JP2660283B2 (en) 1997-10-08

Family

ID=16622890

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62212454A Expired - Fee Related JP2660283B2 (en) 1987-08-26 1987-08-26 Intercom system with monitor TV

Country Status (1)

Country Link
JP (1) JP2660283B2 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60233983A (en) * 1984-05-07 1985-11-20 Canon Inc Pattern detector
JPS60177545U (en) * 1984-05-02 1985-11-26 京セラ株式会社 intercom device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60177545U (en) * 1984-05-02 1985-11-26 京セラ株式会社 intercom device
JPS60233983A (en) * 1984-05-07 1985-11-20 Canon Inc Pattern detector

Also Published As

Publication number Publication date
JP2660283B2 (en) 1997-10-08

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees