JPS5531381A - Interphone device - Google Patents

Interphone device

Info

Publication number
JPS5531381A
JPS5531381A JP10528378A JP10528378A JPS5531381A JP S5531381 A JPS5531381 A JP S5531381A JP 10528378 A JP10528378 A JP 10528378A JP 10528378 A JP10528378 A JP 10528378A JP S5531381 A JPS5531381 A JP S5531381A
Authority
JP
Japan
Prior art keywords
talking
speaker
amplifier
oscillator
switch
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
JP10528378A
Other languages
Japanese (ja)
Other versions
JPS5857945B2 (en
Inventor
Hiroshi Kito
Seiki Sasaki
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 Holdings Corp
Original Assignee
Matsushita Electric Industrial Co 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 Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP10528378A priority Critical patent/JPS5857945B2/en
Publication of JPS5531381A publication Critical patent/JPS5531381A/en
Publication of JPS5857945B2 publication Critical patent/JPS5857945B2/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Alarm Systems (AREA)

Abstract

PURPOSE:To make it unnecessary to use a relay by applying the output of the alarm oscillator to a speaker of the secondary device by means of the circuit configuration to which three transistors are used. CONSTITUTION:When the emergency switch 12 or 39 is closed in case the master device is in a waiting state, the transistor Tr21 is turned ON, the alarm sound oscillator 13 is operated, simultaneously Tr22 and 23 are turned ON through the diode 37, and the talking amplifier 15 is made to be an operation state. At the same time, not only the talking current is supplied to the secondary device 2, but also the talking circuit is formed between the master device 1 and the secondary device 2 by connecting the speaker 20 to the input terminal I<+> of the amplifier 15 with the hook-switch 17. In this case, however, since the output of the oscillator 13 is connected to the terminal I<-> of the amplifier 15, an alarm sound is generated from the speaker 42 after amplifying the afore-mentioned signal. Also, the foregoing is operated in the same way even when the switch 12 or 39 is closed in the state that the master device 1 is in talking, that is, the hook-switches 17, 18 have been changed.
JP10528378A 1978-08-28 1978-08-28 intercom device Expired JPS5857945B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10528378A JPS5857945B2 (en) 1978-08-28 1978-08-28 intercom device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10528378A JPS5857945B2 (en) 1978-08-28 1978-08-28 intercom device

Publications (2)

Publication Number Publication Date
JPS5531381A true JPS5531381A (en) 1980-03-05
JPS5857945B2 JPS5857945B2 (en) 1983-12-22

Family

ID=14403339

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10528378A Expired JPS5857945B2 (en) 1978-08-28 1978-08-28 intercom device

Country Status (1)

Country Link
JP (1) JPS5857945B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5863694U (en) * 1981-10-19 1983-04-28 アイホン株式会社 Intercom system with two alarm functions
JPS5938898A (en) * 1982-08-27 1984-03-02 ホーチキ株式会社 Outdoor alarm utilizing interphone equipment
JPS6076482U (en) * 1983-10-31 1985-05-28 松下電工株式会社 Door phone unit with alarm display
JPH02130097U (en) * 1990-01-18 1990-10-26

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5863694U (en) * 1981-10-19 1983-04-28 アイホン株式会社 Intercom system with two alarm functions
JPS5938898A (en) * 1982-08-27 1984-03-02 ホーチキ株式会社 Outdoor alarm utilizing interphone equipment
JPS6076482U (en) * 1983-10-31 1985-05-28 松下電工株式会社 Door phone unit with alarm display
JPH02130097U (en) * 1990-01-18 1990-10-26

Also Published As

Publication number Publication date
JPS5857945B2 (en) 1983-12-22

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