GB912755A - Improvements in or relating to circuit arrangements for automatic signalling systems - Google Patents
Improvements in or relating to circuit arrangements for automatic signalling systemsInfo
- Publication number
- GB912755A GB912755A GB34006/59A GB3400659A GB912755A GB 912755 A GB912755 A GB 912755A GB 34006/59 A GB34006/59 A GB 34006/59A GB 3400659 A GB3400659 A GB 3400659A GB 912755 A GB912755 A GB 912755A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transistor
- circuits
- tone
- series
- base
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
- H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker
- H04Q3/52—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker using static devices in switching stages, e.g. electronic switching arrangements
- H04Q3/521—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker using static devices in switching stages, e.g. electronic switching arrangements using semiconductors in the switching stages
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M19/00—Current supply arrangements for telephone systems
- H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/18—Electrical details
- H04Q1/30—Signalling arrangements; Manipulation of signalling currents
- H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
- H04Q1/442—Signalling arrangements; Manipulation of signalling currents using alternate current with out-of-voice band signalling frequencies
- H04Q1/4423—Signalling arrangements; Manipulation of signalling currents using alternate current with out-of-voice band signalling frequencies using one signalling frequency
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Devices For Supply Of Signal Current (AREA)
- Amplifiers (AREA)
Abstract
912,755. Valve and transistor amplifying circuits. PHILIPS ELECTRICAL INDUSTRIES Ltd. Oct. 7, 1959 [Oct. 10, 1958], No. 34006/59. Class 40 (6). [Also in Group XXXIX] Signalling tone is passed over the cathode or emitter circuit of a valve or transistor amplifier to a line across which a variable number of load circuits may be connected in parallel, each load being connected in series with a resistor shunter by a capacitor such that a change in the number of load circuits produces a change in D.C. over the line which equals the resulting change in amplitude of the tone signal. As shown in Fig. 1, a tone source SB drives the base of a transistor T, the emitter circuit of which is loaded by subscribers' lines B1, B2 . . ., in series with resistors S and capacitors C in circuits coupled to the lines by transformers TR. Fig. 3 shows the static characteristics L11, L21, L31 ... of emitter current against the bias and signal potential V between ground and the transistor base. Provision of series resistors S shunted by capacitors C gives a set of dynamic characteristics L12, L22, L32 . . ., which have a common intersection G on the V-axis. By making the bias V1 exceed the co-ordinate value of G by the amplitude of the tone source the required relation between A.C. and D.C. in the emitter path is achieved. The load circuits are connected up by switches K which may comprise the diode arrangement of Fig. 4 where a flip-flop FF controls diodes G1 and G2. In this arrangement a rectifier G3 provides the voltage necessary between collector and base of transistor T.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL232178 | 1958-10-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB912755A true GB912755A (en) | 1962-12-12 |
Family
ID=19751383
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB34006/59A Expired GB912755A (en) | 1958-10-10 | 1959-10-07 | Improvements in or relating to circuit arrangements for automatic signalling systems |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPS3623516B1 (en) |
| CH (1) | CH375046A (en) |
| DE (1) | DE1146925B (en) |
| FR (1) | FR1237437A (en) |
| GB (1) | GB912755A (en) |
| NL (2) | NL104005C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1194917B (en) * | 1963-09-25 | 1965-06-16 | Merk Ag Telefonbau Friedrich | Circuit arrangement for telephone switching systems |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1138579A (en) * | 1955-12-14 | 1957-06-17 | Cie Ind Des Telephones | Inrush current sending device |
-
0
- NL NL232178D patent/NL232178A/xx unknown
- NL NL104005D patent/NL104005C/xx active
-
1934
- 1934-10-07 JP JP3155459A patent/JPS3623516B1/ja active Pending
-
1959
- 1959-10-07 GB GB34006/59A patent/GB912755A/en not_active Expired
- 1959-10-07 CH CH7914059A patent/CH375046A/en unknown
- 1959-10-07 DE DEN17352A patent/DE1146925B/en active Pending
- 1959-10-08 FR FR806988A patent/FR1237437A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CH375046A (en) | 1964-02-15 |
| NL104005C (en) | |
| JPS3623516B1 (en) | 1961-12-11 |
| FR1237437A (en) | 1960-07-29 |
| NL232178A (en) | |
| DE1146925B (en) | 1963-04-11 |
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