JPS6489649A - Interphone system - Google Patents
Interphone systemInfo
- 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
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.
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) |
-
1987
- 1987-09-30 JP JP24385287A patent/JPS6489649A/en active Pending
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