FR2256609B1 - - Google Patents
Info
- Publication number
- FR2256609B1 FR2256609B1 FR7500055A FR7500055A FR2256609B1 FR 2256609 B1 FR2256609 B1 FR 2256609B1 FR 7500055 A FR7500055 A FR 7500055A FR 7500055 A FR7500055 A FR 7500055A FR 2256609 B1 FR2256609 B1 FR 2256609B1
- Authority
- FR
- France
- 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
- H04M1/505—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 signals generated in digital form
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Telephone Function (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Mobile Radio Communication Systems (AREA)
- Complex Calculations (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US05/430,377 US3941942A (en) | 1974-01-02 | 1974-01-02 | Two of eight tone encoder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2256609A1 FR2256609A1 (fr) | 1975-07-25 |
| FR2256609B1 true FR2256609B1 (fr) | 1979-10-12 |
Family
ID=23707302
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR7500055A Expired FR2256609B1 (fr) | 1974-01-02 | 1975-01-02 |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US3941942A (fr) |
| JP (2) | JPS512305A (fr) |
| DE (1) | DE2500059C3 (fr) |
| FR (1) | FR2256609B1 (fr) |
| GB (1) | GB1433586A (fr) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4061886A (en) * | 1975-09-29 | 1977-12-06 | Mostek Corporation | Dual tone multiple frequency generator |
| DE2924752C2 (de) * | 1979-06-20 | 1984-02-02 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Tongenerator zur Erzeugung von Signalisierungsfrequenzen in einem MFV-Fernsprechapparat |
| US4270028A (en) * | 1979-09-24 | 1981-05-26 | Gte Automatic Electric Laboratories Incorporated | Digitally activated ringing circuit for generation of AC voltages |
| JPS57127513A (en) * | 1981-01-30 | 1982-08-07 | Nippon Kokan Kk <Nkk> | Zero point adjusting method for roll gap of steel shapes rolling mill |
| DE3114062A1 (de) * | 1981-04-07 | 1982-10-28 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Schaltungsanordnung zur taktumsetzung |
| US4472601A (en) * | 1982-07-14 | 1984-09-18 | Rca Corporation | Control circuit for telephone receiver and transmitter |
| FR2534756A1 (fr) * | 1982-10-13 | 1984-04-20 | Telephonie Ind Commerciale | Circuit generateur de signalisation multifrequence en association avec un microprocesseur, notamment pour poste telephonique |
| JPS5981957A (ja) * | 1982-11-02 | 1984-05-11 | Nippon Telegr & Teleph Corp <Ntt> | デイジタル式電話端末装置用２周波信号発振器 |
| JPS61258553A (ja) * | 1985-05-13 | 1986-11-15 | Ricoh Co Ltd | 周波数信号発生装置 |
| GB2177862B (en) * | 1985-07-09 | 1989-07-19 | Motorola Inc | Waveform generators |
| US5802112A (en) * | 1996-01-16 | 1998-09-01 | Transcendat Inc. | Multi-level, multi-frequency interference pattern analog waveform encoding of digital data for transmission |
| US6038262A (en) * | 1998-06-09 | 2000-03-14 | Transcendata, Inc. | Method and apparatus for compensation of electro-magnetic distortion using weighted feedback delay for amplitude coded sinusoidal waveform generation and transmission |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1496141A (fr) * | 1966-06-03 | 1967-09-29 | Cit Alcatel | Générateur d'ondes modulées en fréquence |
| FR1569618A (fr) * | 1967-12-08 | 1969-06-06 | ||
| US3778556A (en) * | 1971-07-02 | 1973-12-11 | Telecommunications Techn Inc | Telephone signaling and testing apparatus with provisions for either pulse or multifrequency dialing |
| GB1378818A (en) * | 1971-08-27 | 1974-12-27 | Rockwell International Corp | Digital tone signal generator |
| US3778557A (en) * | 1972-03-22 | 1973-12-11 | Post Corp | Encoder |
| US3787836A (en) * | 1972-06-15 | 1974-01-22 | Bell Telephone Labor Inc | Multitone telephone dialing circuit employing digital-to-analog tone synthesis |
-
1974
- 1974-01-02 US US05/430,377 patent/US3941942A/en not_active Expired - Lifetime
- 1974-12-18 GB GB5474574A patent/GB1433586A/en not_active Expired
- 1974-12-28 JP JP50004189A patent/JPS512305A/ja active Pending
-
1975
- 1975-01-02 DE DE2500059A patent/DE2500059C3/de not_active Expired
- 1975-01-02 FR FR7500055A patent/FR2256609B1/fr not_active Expired
-
1980
- 1980-04-21 JP JP1980053270U patent/JPS55152747U/ja active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JPS512305A (fr) | 1976-01-09 |
| FR2256609A1 (fr) | 1975-07-25 |
| DE2500059A1 (de) | 1975-09-18 |
| DE2500059B2 (de) | 1979-01-04 |
| DE2500059C3 (de) | 1981-08-13 |
| US3941942A (en) | 1976-03-02 |
| GB1433586A (en) | 1976-04-28 |
| JPS55152747U (fr) | 1980-11-04 |
Similar Documents
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| ST | Notification of lapse |