JPS642458A - Interphone equipment with monitor - Google Patents
Interphone equipment with monitorInfo
- Publication number
- JPS642458A JPS642458A JP15836187A JP15836187A JPS642458A JP S642458 A JPS642458 A JP S642458A JP 15836187 A JP15836187 A JP 15836187A JP 15836187 A JP15836187 A JP 15836187A JP S642458 A JPS642458 A JP S642458A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- interphone
- speech
- carrier
- monitor
- 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
- Burglar Alarm Systems (AREA)
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
Abstract
PURPOSE: To facilitate the installation of an interphone device and to make its wiring inconspicuous by generating a frequency multiplex signal consisting of either of an interphone speech signal and a monitor image signal as a base- band transmission signal and the other as a carrier transmission signal using a carrier of relatively low frequency.
CONSTITUTION: An interphone slave equipment 2 is provided with a signal composing means 6 which generates the frequency multiplex signal consisting of the interphone speech Vi as the base-band transmission signal and the monitor signal Vp as the carrier transmission signal Vp' using the carrier of relatively low frequency (8MHz). Further, an interphone master equipment 5 is provided with a signal separating means 7 which separates the frequency multiplex signal Vip to obtain the interphone speech signal Vi and monitor image signal Vp. Then the frequency multiplex signal Vip is transmitted through an interphone speech line 3a wired between the interphone slave equipment 2 and interphone master equipment 5. Consequently, only the interphone speech line needs to be wired, so the installation is facilitated.
COPYRIGHT: (C)1989,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15836187A JPS642458A (en) | 1987-06-25 | 1987-06-25 | Interphone equipment with monitor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15836187A JPS642458A (en) | 1987-06-25 | 1987-06-25 | Interphone equipment with monitor |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH012458A JPH012458A (en) | 1989-01-06 |
JPS642458A true JPS642458A (en) | 1989-01-06 |
Family
ID=15669997
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15836187A Pending JPS642458A (en) | 1987-06-25 | 1987-06-25 | Interphone equipment with monitor |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS642458A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04253463A (en) * | 1991-01-30 | 1992-09-09 | Matsushita Electric Ind Co Ltd | Home telephone system |
EP0896227A2 (en) * | 1997-08-05 | 1999-02-10 | Bticino S.P.A. | Harness control system for civil electric plants, in particular for intercom or video intercom systems |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58141086A (en) * | 1982-02-15 | 1983-08-22 | Matsushita Electric Works Ltd | Television interphone system |
JPS6240599A (en) * | 1985-08-19 | 1987-02-21 | アイホン株式会社 | Interphone system for housing complex |
-
1987
- 1987-06-25 JP JP15836187A patent/JPS642458A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58141086A (en) * | 1982-02-15 | 1983-08-22 | Matsushita Electric Works Ltd | Television interphone system |
JPS6240599A (en) * | 1985-08-19 | 1987-02-21 | アイホン株式会社 | Interphone system for housing complex |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04253463A (en) * | 1991-01-30 | 1992-09-09 | Matsushita Electric Ind Co Ltd | Home telephone system |
EP0896227A2 (en) * | 1997-08-05 | 1999-02-10 | Bticino S.P.A. | Harness control system for civil electric plants, in particular for intercom or video intercom systems |
EP0896227A3 (en) * | 1997-08-05 | 1999-07-28 | Bticino S.P.A. | Harness control system for civil electric plants, in particular for intercom or video intercom systems |
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