GB816700A - Improvements in or relating to telecommunications circuit arrangements for subscribers' stations having keyboard selection - Google Patents
Improvements in or relating to telecommunications circuit arrangements for subscribers' stations having keyboard selectionInfo
- Publication number
- GB816700A GB816700A GB2970857A GB2970857A GB816700A GB 816700 A GB816700 A GB 816700A GB 2970857 A GB2970857 A GB 2970857A GB 2970857 A GB2970857 A GB 2970857A GB 816700 A GB816700 A GB 816700A
- Authority
- GB
- United Kingdom
- Prior art keywords
- contacts
- receiver
- over contacts
- transistor
- sept
- 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.)
- Expired
Links
- 230000000994 depressogenic effect Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 abstract 1
- 230000004907 flux Effects 0.000 abstract 1
- 239000011521 glass Substances 0.000 abstract 1
- 230000001681 protective effect Effects 0.000 abstract 1
- 238000004804 winding Methods 0.000 abstract 1
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
- H04M1/50—Devices which can set up and transmit only one digit at a time by generating or selecting currents of predetermined frequencies or combinations of frequencies
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Selective Calling Equipment (AREA)
- Telephonic Communication Services (AREA)
Abstract
816,700. Automatic exchange systems. SIEMENS & HALSKE A.G. Sept. 20, 1957 [Sept. 28, 1956], No. 29708/57. Class 40 (4). In a subset a transistor forms part of an oscillator which generates a different frequency for each digit key depressed and under control of change-over contacts also serves as a speech amplifier. When the subscriber takes down his receiver closure of the cradle switch contacts 1hu, 2hu connects the transmitter M and receiver H to the line in the normal manner. Depression of a digit key (not shown) closes the corresponding one of contacts t1 ... t0 and changes over contacts 4t, 5t, thus disconnecting the transmitter M and receiver H and substituting the oscillator including transistor Tr, the operated contact of t1 ... t10 switching different valves of Ls3, or Ks, or both, into the tank circuit to determine the frequency to be generated. When the connection has been established the subscriber operates the changeover switch which changes over contacts 6u ... 15u. The transistor circuit is thus rearranged as an amplifier for incoming signals, the secondary winding of the transformer G1, G2, G3 being connected to its input side and the secondary L4 of the transformer Ls2, Ls3, L4 being connected to the receiver H. The change-over contacts may consist of protective tube contacts, that is of inner contact springs and outer contact springs enclosed in a sealed glass tube, the springs carrying magnetic flux by means of which the contacts are operated under the control of an external currentcarrying coil or of a permanent magnet, each contact forming in effect an armature.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DES50618A DE1034701B (en) | 1956-09-28 | 1956-09-28 | Circuit arrangement for subscriber stations in telecommunications, especially telephone systems, with keypad selection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB816700A true GB816700A (en) | 1959-07-15 |
Family
ID=7487847
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2970857A Expired GB816700A (en) | 1956-09-28 | 1957-09-20 | Improvements in or relating to telecommunications circuit arrangements for subscribers' stations having keyboard selection |
Country Status (3)
| Country | Link |
|---|---|
| CH (1) | CH353408A (en) |
| DE (1) | DE1034701B (en) |
| GB (1) | GB816700A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE632027A (en) * | 1959-10-02 | |||
| CH379583A (en) * | 1960-03-22 | 1964-07-15 | Autophon Ag | Device for generating control criteria which are particularly suitable for the transmission of the choice in telephone systems |
| BE638253A (en) * | 1962-10-05 | |||
| DE1221297B (en) * | 1964-09-25 | 1966-07-21 | Siemens Ag | Circuit arrangement for generating vibrations, in particular for alternating current keyboard selection in telecommunication systems, in particular telephone systems |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL31051C (en) * | 1930-01-09 |
-
1956
- 1956-09-28 DE DES50618A patent/DE1034701B/en active Pending
-
1957
- 1957-09-20 GB GB2970857A patent/GB816700A/en not_active Expired
- 1957-09-24 CH CH353408D patent/CH353408A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| CH353408A (en) | 1961-04-15 |
| DE1034701B (en) | 1958-07-24 |
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