IT972579B - IMPROVEMENT IN THE TRANSMITTERS OF ELECTRICAL IMPULSES - Google Patents
IMPROVEMENT IN THE TRANSMITTERS OF ELECTRICAL IMPULSESInfo
- Publication number
- IT972579B IT972579B IT33187/72A IT3318772A IT972579B IT 972579 B IT972579 B IT 972579B IT 33187/72 A IT33187/72 A IT 33187/72A IT 3318772 A IT3318772 A IT 3318772A IT 972579 B IT972579 B IT 972579B
- Authority
- IT
- Italy
- Prior art keywords
- transmitters
- improvement
- electrical impulses
- impulses
- electrical
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/26—Devices for calling a subscriber
- H04M1/30—Devices which can set up and transmit only one digit at a time
- H04M1/31—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses
- H04M1/312—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses pulses produced by electronic circuits
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/26—Devices for calling a subscriber
- H04M1/515—Devices for calling a subscriber by generating or selecting signals other than trains of pulses of similar shape, or signals other than currents of one or more different frequencies, e.g. generation of dc signals of alternating polarity, coded pulses or impedance dialling
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Monitoring And Testing Of Exchanges (AREA)
- Telephonic Communication Services (AREA)
- Exchange Systems With Centralized Control (AREA)
- Mobile Radio Communication Systems (AREA)
- Electronic Switches (AREA)
- Selective Calling Equipment (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB5992771A GB1369829A (en) | 1971-12-23 | 1971-12-23 | Electric impulse transmitters |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| IT972579B true IT972579B (en) | 1974-05-31 |
Family
ID=10484670
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IT33187/72A IT972579B (en) | 1971-12-23 | 1972-12-20 | IMPROVEMENT IN THE TRANSMITTERS OF ELECTRICAL IMPULSES |
Country Status (8)
| Country | Link |
|---|---|
| AU (1) | AU470553B2 (en) |
| DE (1) | DE2262505C2 (en) |
| ES (1) | ES409985A1 (en) |
| FR (1) | FR2165649A5 (en) |
| GB (1) | GB1369829A (en) |
| IE (1) | IE37079B1 (en) |
| IT (1) | IT972579B (en) |
| ZA (1) | ZA728043B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL7907134A (en) * | 1979-09-25 | 1981-03-27 | Ericsson Telefon Mij | TELEPHONE INSTALLATION OF THE TYPE INDICATED AS A STAR POINT INSTALLATION. |
| FR2501938B1 (en) * | 1981-03-13 | 1985-06-21 | Constr Telephoniques | SIGNAL CONFORMER CIRCUIT |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1236961A (en) * | 1968-01-12 | 1971-06-23 | Gen Electric Co Ltd | Improvements in or relating to electric impulse transmitters |
-
1971
- 1971-12-23 GB GB5992771A patent/GB1369829A/en not_active Expired
- 1971-12-23 ZA ZA728043A patent/ZA728043B/en unknown
-
1972
- 1972-11-15 IE IE1572/72A patent/IE37079B1/en unknown
- 1972-12-04 AU AU49596/72A patent/AU470553B2/en not_active Expired
- 1972-12-20 IT IT33187/72A patent/IT972579B/en active
- 1972-12-20 DE DE2262505A patent/DE2262505C2/en not_active Expired
- 1972-12-21 FR FR7245702A patent/FR2165649A5/fr not_active Expired
- 1972-12-22 ES ES409985A patent/ES409985A1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| IE37079L (en) | 1973-06-23 |
| FR2165649A5 (en) | 1973-08-03 |
| AU470553B2 (en) | 1976-03-18 |
| AU4959672A (en) | 1974-06-06 |
| DE2262505C2 (en) | 1982-12-09 |
| DE2262505A1 (en) | 1973-06-28 |
| ZA728043B (en) | 1973-07-25 |
| GB1369829A (en) | 1974-10-09 |
| ES409985A1 (en) | 1976-04-01 |
| IE37079B1 (en) | 1977-04-27 |
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