IT976190B - SYSTEM FOR THE TRANSMISSION OF SIGNALS ON SIGNALING LINES INSTALLED IN BUILDINGS - Google Patents
SYSTEM FOR THE TRANSMISSION OF SIGNALS ON SIGNALING LINES INSTALLED IN BUILDINGSInfo
- Publication number
- IT976190B IT976190B IT7106272A IT7106272A IT976190B IT 976190 B IT976190 B IT 976190B IT 7106272 A IT7106272 A IT 7106272A IT 7106272 A IT7106272 A IT 7106272A IT 976190 B IT976190 B IT 976190B
- Authority
- IT
- Italy
- Prior art keywords
- buildings
- signals
- transmission
- signaling lines
- lines installed
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
- H04N7/183—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast for receiving images from a single remote source
- H04N7/186—Video door telephones
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B1/00—Systems for signalling characterised solely by the form of transmission of the signal
- G08B1/08—Systems for signalling characterised solely by the form of transmission of the signal using electric transmission ; transformation of alarm signals to electrical signals from a different medium, e.g. transmission of an electric alarm signal upon detection of an audible alarm signal
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B3/00—Audible signalling systems; Audible personal calling systems
- G08B3/10—Audible signalling systems; Audible personal calling systems using electric transmission; using electromagnetic transmission
- G08B3/1008—Personal calling arrangements or devices, i.e. paging systems
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/44—Arrangements for feeding power to a repeater along the transmission line
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
- H04M11/02—Telephonic communication systems specially adapted for combination with other electrical systems with bell or annunciator systems
- H04M11/022—Paging systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
- H04M11/02—Telephonic communication systems specially adapted for combination with other electrical systems with bell or annunciator systems
- H04M11/025—Door telephones
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/001—Two-way communication systems between a limited number of parties
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2165904 | 1971-12-31 | ||
DE19722236431 DE2236431A1 (en) | 1972-07-25 | 1972-07-25 | SYSTEM FOR MULTIPLE USE OF SIGNAL LINES IN BUILDINGS |
Publications (1)
Publication Number | Publication Date |
---|---|
IT976190B true IT976190B (en) | 1974-08-20 |
Family
ID=25762266
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IT7106272A IT976190B (en) | 1971-12-31 | 1972-12-22 | SYSTEM FOR THE TRANSMISSION OF SIGNALS ON SIGNALING LINES INSTALLED IN BUILDINGS |
Country Status (4)
Country | Link |
---|---|
FR (1) | FR2167183A5 (en) |
GB (1) | GB1422130A (en) |
IT (1) | IT976190B (en) |
NL (1) | NL7217676A (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2123193B (en) * | 1982-06-19 | 1985-12-11 | James Ernest Gleave | Public address system |
FR2612671A1 (en) * | 1987-03-18 | 1988-09-23 | Lorenzelli Marcel | Door phone video system using a single coaxial cable for transmitting information, a standard, unmodified television receiver, and wireless remote control |
KR940000250B1 (en) * | 1989-12-28 | 1994-01-12 | 주식회사 금성사 | Signal transmitting device of door phone |
ES2245192B1 (en) * | 2003-08-08 | 2007-02-16 | Raul Gonzalez Martinez | AUTOMATIC PORTER INSTALLATION WITH BIDIRECTIONAL ACCESS TO TELEPHONE LINE. |
-
1972
- 1972-12-22 IT IT7106272A patent/IT976190B/en active
- 1972-12-27 NL NL7217676A patent/NL7217676A/xx unknown
- 1972-12-29 FR FR7247043A patent/FR2167183A5/fr not_active Expired
- 1972-12-29 GB GB6011472A patent/GB1422130A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
GB1422130A (en) | 1976-01-21 |
NL7217676A (en) | 1973-07-03 |
FR2167183A5 (en) | 1973-08-17 |
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