DE2236781A1 - - Google Patents
Info
- Publication number
- DE2236781A1 DE2236781A1 DE19722236781 DE2236781A DE2236781A1 DE 2236781 A1 DE2236781 A1 DE 2236781A1 DE 19722236781 DE19722236781 DE 19722236781 DE 2236781 A DE2236781 A DE 2236781A DE 2236781 A1 DE2236781 A1 DE 2236781A1
- Authority
- DE
- Germany
- 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.)
- Granted
Links
Classifications
-
- 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
- H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
- H04Q1/457—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling with conversion of multifrequency signals into digital signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/30—Systems using multi-frequency codes wherein each code element is represented by a combination of frequencies
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Telephonic Communication Services (AREA)
- Monitoring And Testing Of Exchanges (AREA)
- Mobile Radio Communication Systems (AREA)
Priority Applications (12)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2236781A DE2236781C2 (de) | 1972-07-26 | 1972-07-26 | Schaltungsanordnung für Mehrfrequenzen-Codezeichenempfänger in Fernmelde-, insbesondere Fernsprechanlagen mit zusätzlichem Datenverkehr |
CH711773A CH558115A (de) | 1972-07-26 | 1973-05-18 | Schaltungsanordnung fuer mehrfrequenzen-codezeichenempfaenger in fernmelde-, insbesondere fernsprechanlagen mit zusaetzlichem datenverkehr. |
AT438073A AT326732B (de) | 1972-07-26 | 1973-05-18 | Schaltungsanordnung für mehrfrequenzen-codezeichenempfänger in fernmelde-, insbesondere fernsprechanlagen mit zusätzlichem datenverkehr |
NL7309814A NL7309814A (de) | 1972-07-26 | 1973-07-13 | |
GB3421773A GB1427407A (en) | 1972-07-26 | 1973-07-18 | Multi-frequency code signal receivers for use in telecommunicati ons systems |
FR7326707A FR2194092B1 (de) | 1972-07-26 | 1973-07-20 | |
US381614A US3914558A (en) | 1972-07-26 | 1973-07-23 | Circuit arrangement for multiple frequency code character receivers in telecommunication systems |
LU68083A LU68083A1 (de) | 1972-07-26 | 1973-07-24 | |
IT27032/73A IT992675B (it) | 1972-07-26 | 1973-07-25 | Disposizione circuitale per ricevi tori di segnali in codice a piu frequenze in impianti di teleco municazioni specie in impianti tele fonici con aggiuntivo traffico di dati |
SE7310414A SE385179B (sv) | 1972-07-26 | 1973-07-26 | Kopplingsanordning for flerfrekvenssignalmottagare i teleanleggningar, serskilt telefonanleggningar som even utnyttjas for datatrafik |
BE133905A BE802836A (fr) | 1972-07-26 | 1973-07-26 | Montage pour recepteurs de signaux codes sur plusieurs frequences dans des installations de telecommunications |
JP48084542A JPS4953702A (de) | 1972-07-26 | 1973-07-26 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2236781A DE2236781C2 (de) | 1972-07-26 | 1972-07-26 | Schaltungsanordnung für Mehrfrequenzen-Codezeichenempfänger in Fernmelde-, insbesondere Fernsprechanlagen mit zusätzlichem Datenverkehr |
Publications (3)
Publication Number | Publication Date |
---|---|
DE2236781B1 DE2236781B1 (de) | 1973-11-08 |
DE2236781A1 true DE2236781A1 (de) | 1973-11-08 |
DE2236781C2 DE2236781C2 (de) | 1974-06-12 |
Family
ID=5851808
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE2236781A Expired DE2236781C2 (de) | 1972-07-26 | 1972-07-26 | Schaltungsanordnung für Mehrfrequenzen-Codezeichenempfänger in Fernmelde-, insbesondere Fernsprechanlagen mit zusätzlichem Datenverkehr |
Country Status (12)
Country | Link |
---|---|
US (1) | US3914558A (de) |
JP (1) | JPS4953702A (de) |
AT (1) | AT326732B (de) |
BE (1) | BE802836A (de) |
CH (1) | CH558115A (de) |
DE (1) | DE2236781C2 (de) |
FR (1) | FR2194092B1 (de) |
GB (1) | GB1427407A (de) |
IT (1) | IT992675B (de) |
LU (1) | LU68083A1 (de) |
NL (1) | NL7309814A (de) |
SE (1) | SE385179B (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2534636A1 (de) * | 1975-08-02 | 1977-02-17 | Telefonbau & Normalzeit Gmbh | Schaltungsanordnung zum senden von anschaltinformationen, insbesondere in nebenstellenanlagen |
JPS54120503A (en) * | 1978-03-11 | 1979-09-19 | Nippon Telegr & Teleph Corp <Ntt> | Coding system for push-button dial signal |
FR2759224B1 (fr) * | 1997-02-06 | 1999-04-30 | Info Telecom | Procedes de transmission et de decodage acoustiques d'un message numerique et dispositifs correspondants |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3288940A (en) * | 1963-10-24 | 1966-11-29 | Automatic Elect Lab | Multifrequency signal receiver |
US3582562A (en) * | 1969-05-07 | 1971-06-01 | Itt | Key telephone intercommunication system |
-
1972
- 1972-07-26 DE DE2236781A patent/DE2236781C2/de not_active Expired
-
1973
- 1973-05-18 AT AT438073A patent/AT326732B/de not_active IP Right Cessation
- 1973-05-18 CH CH711773A patent/CH558115A/de not_active IP Right Cessation
- 1973-07-13 NL NL7309814A patent/NL7309814A/xx not_active Application Discontinuation
- 1973-07-18 GB GB3421773A patent/GB1427407A/en not_active Expired
- 1973-07-20 FR FR7326707A patent/FR2194092B1/fr not_active Expired
- 1973-07-23 US US381614A patent/US3914558A/en not_active Expired - Lifetime
- 1973-07-24 LU LU68083A patent/LU68083A1/xx unknown
- 1973-07-25 IT IT27032/73A patent/IT992675B/it active
- 1973-07-26 SE SE7310414A patent/SE385179B/xx unknown
- 1973-07-26 BE BE133905A patent/BE802836A/xx unknown
- 1973-07-26 JP JP48084542A patent/JPS4953702A/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
ATA438073A (de) | 1975-03-15 |
JPS4953702A (de) | 1974-05-24 |
CH558115A (de) | 1975-01-15 |
AT326732B (de) | 1975-12-29 |
LU68083A1 (de) | 1974-03-07 |
FR2194092B1 (de) | 1976-11-12 |
FR2194092A1 (de) | 1974-02-22 |
US3914558A (en) | 1975-10-21 |
BE802836A (fr) | 1974-01-28 |
NL7309814A (de) | 1974-01-29 |
GB1427407A (en) | 1976-03-10 |
SE385179B (sv) | 1976-06-08 |
DE2236781B1 (de) | 1973-11-08 |
IT992675B (it) | 1975-09-30 |
DE2236781C2 (de) | 1974-06-12 |
Similar Documents
Legal Events
Date | Code | Title | Description |
---|---|---|---|
E77 | Valid patent as to the heymanns-index 1977 | ||
8339 | Ceased/non-payment of the annual fee |