GB984580A - Improvements in or relating to circuit arrangements for automatic telephone systems - Google Patents
Improvements in or relating to circuit arrangements for automatic telephone systemsInfo
- Publication number
- GB984580A GB984580A GB3483762A GB3483762A GB984580A GB 984580 A GB984580 A GB 984580A GB 3483762 A GB3483762 A GB 3483762A GB 3483762 A GB3483762 A GB 3483762A GB 984580 A GB984580 A GB 984580A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signal
- circuit
- keysender
- relay
- winding
- 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
- 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
-
- 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
- H04M19/04—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone the ringing-current being generated at the substations
-
- 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
- H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Telephonic Communication Services (AREA)
- Devices For Supply Of Signal Current (AREA)
Abstract
984,580. Automatic exchanges. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. Sept. 12, 1962 [Sept. 15, 1961], No. 34837/62. Heading H4K. In a system in which a subscriber's set is provided with a keysender for sending audio frequencies indicative of a wanted subscriber's number, the microphone is kept disconneected until a relay is operated by a signal from the exchange, which signal is sent only when all the digits have been received. Closure of the hookswitch H connects up keysender 3 and connects winding R1 of relay R in place of the " tone ringer " 10. When all the digits have been received at the exchange, the receiver 2 reverts a " ringing signal " which brings up relay R over its winding R1. This disconnects keysender 3, connects up the microphone 5 and receiver 7 and completes a holding circuit for R through winding R2. A capacitative shunt across r may be provided to permit passage of " dialling " tone. A circuit which has a high impedance only when the supply to point 14 is removed may be connected in series with capacitor 13 to prevent dissipation of speech signals in signal receiver 9. This circuit may comprise a saturable reactor, a threshold circuit or a diode.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL269292 | 1961-09-15 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB984580A true GB984580A (en) | 1965-02-24 |
Family
ID=19753285
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3483762A Expired GB984580A (en) | 1961-09-15 | 1962-09-12 | Improvements in or relating to circuit arrangements for automatic telephone systems |
Country Status (5)
Country | Link |
---|---|
BE (1) | BE622438A (en) |
CH (1) | CH395205A (en) |
DE (1) | DE1159041B (en) |
GB (1) | GB984580A (en) |
NL (1) | NL269292A (en) |
-
0
- NL NL269292D patent/NL269292A/xx unknown
- BE BE622438D patent/BE622438A/xx unknown
-
1962
- 1962-09-11 DE DEN22079A patent/DE1159041B/en active Pending
- 1962-09-12 GB GB3483762A patent/GB984580A/en not_active Expired
- 1962-09-12 CH CH1081162A patent/CH395205A/en unknown
Also Published As
Publication number | Publication date |
---|---|
DE1159041B (en) | 1963-12-12 |
BE622438A (en) | |
NL269292A (en) | |
CH395205A (en) | 1965-07-15 |
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