JPS6489649A - Interphone system - Google Patents

Interphone system

Info

Publication number
JPS6489649A
JPS6489649A JP24385287A JP24385287A JPS6489649A JP S6489649 A JPS6489649 A JP S6489649A JP 24385287 A JP24385287 A JP 24385287A JP 24385287 A JP24385287 A JP 24385287A JP S6489649 A JPS6489649 A JP S6489649A
Authority
JP
Japan
Prior art keywords
calling
door phone
equipment
signal
circuit
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
JP24385287A
Other languages
Japanese (ja)
Inventor
Mitsuhiro Matsuda
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.)
Toshiba Electric Equipment Corp
Original Assignee
Toshiba Electric Equipment Corp
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 Toshiba Electric Equipment Corp filed Critical Toshiba Electric Equipment Corp
Priority to JP24385287A priority Critical patent/JPS6489649A/en
Publication of JPS6489649A publication Critical patent/JPS6489649A/en
Pending legal-status Critical Current

Links

Landscapes

  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)

Abstract

PURPOSE:To attain connection between a door phone system and a master equipment main body with a four-core code by sharing an extension speaker signal line for the transmission of an extension speaker signal and a calling signal. CONSTITUTION:When an extension switch 5 is closed at a door phone equipment, the call detecting signal of an H level is generated in the collector of a TR1 and a calling tone generating circuit is driven. A calling tone signal from this calling tone generating circuit is amplified by a power amplifier A1 and uttered by speakers SP1 and SP2. On the other hand, a calling between a door phone slave equipment 3 and a master equipment 1 can be executed since a hook switch FS is closed and a calling circuit is formed by executing the off-hook of a hand-set. In such a case, a calling output from the master equipment 1 to the door phone slave equipment 3 is transmitted from the amplifier A1 through a hybrid circuit HB and the calling output transmitted from the door phone slave equipment 3 through the circuit HB to the speaker SP1.
JP24385287A 1987-09-30 1987-09-30 Interphone system Pending JPS6489649A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP24385287A JPS6489649A (en) 1987-09-30 1987-09-30 Interphone system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP24385287A JPS6489649A (en) 1987-09-30 1987-09-30 Interphone system

Publications (1)

Publication Number Publication Date
JPS6489649A true JPS6489649A (en) 1989-04-04

Family

ID=17109915

Family Applications (1)

Application Number Title Priority Date Filing Date
JP24385287A Pending JPS6489649A (en) 1987-09-30 1987-09-30 Interphone system

Country Status (1)

Country Link
JP (1) JPS6489649A (en)

Similar Documents

Publication Publication Date Title
EP0129208A3 (en) Handsfree circuit for telephone instrument
JPS6489649A (en) Interphone system
JPS6410763A (en) Door phone
JPS54114011A (en) Loudspeaker telephone device
JPS6183351U (en)
JPS6430353A (en) Calling device
JPS6472633A (en) Transfer system for cordless telephone system
JPH0221847U (en)
JPS61166649U (en)
JPH02218249A (en) Telephone set capable of changing call tone
JP2894188B2 (en) Telephone
JPS54105416A (en) Hand-free talking system of key telephone set
KR860000484Y1 (en) One hand telephone
GR3019461T3 (en) Management method for calls entering a telecopier sharing a telephone line with its associated telephone set and a second set
KR950035235A (en) Call circuit of digital key phone with internal sidetone function
JPS55147866A (en) Extension circuit of key telephone unit
JPH066435A (en) Digital telephone set
KR900005737A (en) Voice Service Pass Control Using Analog Multiplexer
JPS57136855A (en) Howler tone transmission system
JPS56158565A (en) Automatic answering telephone set capable for formation of waiting state by means of remote control
KR910021075A (en) Ambient Noise Canceling System for Telephone Handsets
JPS6490657A (en) Facsimile communication equipment
JPS6175649U (en)
JPS5726958A (en) Interphone device
JPH0351541U (en)