FR2286564B1 - - Google Patents
Info
- Publication number
- FR2286564B1 FR2286564B1 FR7432909A FR7432909A FR2286564B1 FR 2286564 B1 FR2286564 B1 FR 2286564B1 FR 7432909 A FR7432909 A FR 7432909A FR 7432909 A FR7432909 A FR 7432909A FR 2286564 B1 FR2286564 B1 FR 2286564B1
- 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)
- Manipulation Of Pulses (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
- Electrophonic Musical Instruments (AREA)
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7432909A FR2286564A1 (fr) | 1974-09-30 | 1974-09-30 | Dispositif synthetiseur de signaux a multifrequences |
| US05/617,839 US3999049A (en) | 1974-09-30 | 1975-09-29 | Synthesizer of multifrequency code signals |
| DE2543355A DE2543355C3 (de) | 1974-09-30 | 1975-09-29 | Schaltungsanordnung zur Erzeugung von Signalen eines Mehrfrequenz-Code |
| GB40021/75A GB1511923A (en) | 1974-09-30 | 1975-09-30 | Synthetizer of multifrequency signals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7432909A FR2286564A1 (fr) | 1974-09-30 | 1974-09-30 | Dispositif synthetiseur de signaux a multifrequences |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2286564A1 FR2286564A1 (fr) | 1976-04-23 |
| FR2286564B1 true FR2286564B1 (2) | 1978-12-01 |
Family
ID=9143594
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR7432909A Granted FR2286564A1 (fr) | 1974-09-30 | 1974-09-30 | Dispositif synthetiseur de signaux a multifrequences |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US3999049A (2) |
| DE (1) | DE2543355C3 (2) |
| FR (1) | FR2286564A1 (2) |
| GB (1) | GB1511923A (2) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4110567A (en) * | 1977-03-14 | 1978-08-29 | International Standard Electric Corporation | Multi-frequency generator using digital technique |
| US4132871A (en) * | 1977-06-22 | 1979-01-02 | Fairchild Camera And Instrument Corporation | Digitally synthesized multi-frequency signal generator |
| US4213185A (en) * | 1978-09-18 | 1980-07-15 | Motorola, Inc. | Microprocessor tone synthesizer with reduced quantization error |
| FR2474785A1 (fr) * | 1980-01-09 | 1981-07-31 | Cit Alcatel | Dispositif de controle d'un generateur numerique de signaux |
| US4409554A (en) * | 1981-02-25 | 1983-10-11 | Lentz Joe B | Electronic signal simulation device |
| EP0147791B1 (en) * | 1983-12-26 | 1990-08-29 | Kabushiki Kaisha Toshiba | Dual-tone multiple-frequency-signal generating apparatus |
| US4633183A (en) * | 1985-02-28 | 1986-12-30 | Hayes Microcomputer Products, Inc. | Constant resolution frequency synthesizer |
| DE3712975A1 (de) * | 1987-04-16 | 1988-11-03 | Kernforschungsanlage Juelich | Verfahren und schaltungsanordnung zur digitalen einstellung einer steuerfrequenz |
| US4914396A (en) * | 1987-09-21 | 1990-04-03 | Acme Electric Corporation | PWM waveform generator |
| KR100387042B1 (ko) * | 1995-12-30 | 2003-08-14 | 삼성전자주식회사 | 톤신호발생장치 |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3424870A (en) * | 1965-09-14 | 1969-01-28 | Bell Telephone Labor Inc | Multifrequency signal generator for tone-dialed telephones |
| FR2080507A1 (2) * | 1970-01-16 | 1971-11-19 | Revel Maurice | |
| US3701027A (en) * | 1971-04-15 | 1972-10-24 | Bunker Ramo | Digital frequency synthesizer |
| US3820028A (en) * | 1971-08-27 | 1974-06-25 | J Thomas | Digital tone signal generator |
| US3719897A (en) * | 1971-11-26 | 1973-03-06 | Gte Automatic Electric Lab Inc | Digital tone generator |
| BE795179A (fr) * | 1972-02-11 | 1973-08-09 | Gte Automatic Electric Lab Inc | Generateur acoustique a clavier de selection |
| US3801912A (en) * | 1972-03-27 | 1974-04-02 | Milgo Electronic Corp | Frequency modulation communication system and digital carrier generator and demodulator for use therein |
| NL160687C (nl) * | 1972-06-10 | 1979-11-15 | Philips Nv | Toongenerator voor het opwekken van gekozen frequenties. |
| US3787836A (en) * | 1972-06-15 | 1974-01-22 | Bell Telephone Labor Inc | Multitone telephone dialing circuit employing digital-to-analog tone synthesis |
| US3824484A (en) * | 1972-10-12 | 1974-07-16 | Compound Computing Corp | Touch-tone signal generation system |
-
1974
- 1974-09-30 FR FR7432909A patent/FR2286564A1/fr active Granted
-
1975
- 1975-09-29 DE DE2543355A patent/DE2543355C3/de not_active Expired
- 1975-09-29 US US05/617,839 patent/US3999049A/en not_active Expired - Lifetime
- 1975-09-30 GB GB40021/75A patent/GB1511923A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR2286564A1 (fr) | 1976-04-23 |
| US3999049A (en) | 1976-12-21 |
| GB1511923A (en) | 1978-05-24 |
| DE2543355A1 (de) | 1976-04-08 |
| DE2543355C3 (de) | 1981-06-25 |
| DE2543355B2 (de) | 1980-07-03 |
Similar Documents
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| ST | Notification of lapse |