IT986136B - Generatore di tono per la genera zione di frequenze selezionate te - Google Patents
Generatore di tono per la genera zione di frequenze selezionate teInfo
- Publication number
- IT986136B IT986136B IT50551/73A IT5055173A IT986136B IT 986136 B IT986136 B IT 986136B IT 50551/73 A IT50551/73 A IT 50551/73A IT 5055173 A IT5055173 A IT 5055173A IT 986136 B IT986136 B IT 986136B
- Authority
- IT
- Italy
- Prior art keywords
- generation
- tone generator
- selected frequencies
- frequencies
- tone
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K23/00—Pulse counters comprising counting chains; Frequency dividers comprising counting chains
- H03K23/64—Pulse counters comprising counting chains; Frequency dividers comprising counting chains with a base or radix other than a power of two
- H03K23/68—Pulse counters comprising counting chains; Frequency dividers comprising counting chains with a base or radix other than a power of two with a base which is a non-integer
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K23/00—Pulse counters comprising counting chains; Frequency dividers comprising counting chains
- H03K23/64—Pulse counters comprising counting chains; Frequency dividers comprising counting chains with a base or radix other than a power of two
- H03K23/66—Pulse counters comprising counting chains; Frequency dividers comprising counting chains with a base or radix other than a power of two with a variable counting base, e.g. by presetting or by adding or suppressing pulses
-
- 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)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
- Electrophonic Musical Instruments (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Analogue/Digital Conversion (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL7207933.A NL160687C (nl) | 1972-06-10 | 1972-06-10 | Toongenerator voor het opwekken van gekozen frequenties. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| IT986136B true IT986136B (it) | 1975-01-20 |
Family
ID=19816248
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IT50551/73A IT986136B (it) | 1972-06-10 | 1973-06-07 | Generatore di tono per la genera zione di frequenze selezionate te |
Country Status (11)
| Country | Link |
|---|---|
| US (1) | US3832639A (ja) |
| JP (1) | JPS5748883B2 (ja) |
| BE (1) | BE800738A (ja) |
| CA (1) | CA1001236A (ja) |
| DE (1) | DE2328992C3 (ja) |
| DK (1) | DK143676C (ja) |
| ES (1) | ES415718A1 (ja) |
| FR (1) | FR2188360B1 (ja) |
| GB (1) | GB1399200A (ja) |
| IT (1) | IT986136B (ja) |
| NL (1) | NL160687C (ja) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2286564A1 (fr) * | 1974-09-30 | 1976-04-23 | Roche Bernard | Dispositif synthetiseur de signaux a multifrequences |
| GB1529851A (en) * | 1975-01-10 | 1978-10-25 | Gen Instr Microelect | Frequency-signalling circuit for a telephone |
| US3992612A (en) * | 1975-10-14 | 1976-11-16 | The United States Of America As Represented By The Secretary Of The Army | Rate multiplier |
| US4025865A (en) * | 1976-01-08 | 1977-05-24 | General Instrument Corporation | Frequency-signalling circuit for a telephone |
| US4160173A (en) * | 1976-12-14 | 1979-07-03 | Tokyo Shibaura Electric Co., Ltd. | Logic circuit with two pairs of cross-coupled nand/nor gates |
| JPS546845U (ja) * | 1977-06-17 | 1979-01-17 | ||
| FR2452823A1 (fr) * | 1979-03-30 | 1980-10-24 | Texas Instruments France | Generateur de signaux a basse frequence, notamment de signaux de tonalite pour communications telephoniques |
| DE2924752C2 (de) * | 1979-06-20 | 1984-02-02 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Tongenerator zur Erzeugung von Signalisierungsfrequenzen in einem MFV-Fernsprechapparat |
| US4421952A (en) * | 1981-10-16 | 1983-12-20 | Motorola, Inc. | Multi-frequency busy signal synthesizing circuitry |
| NL8301366A (nl) * | 1983-04-19 | 1984-11-16 | Philips Nv | Transmissieschakeling voor een dtmf-telefoontoestel. |
| US4698619A (en) * | 1984-05-07 | 1987-10-06 | Honeywell Inc. | Variable frequency fire tone generator |
| HU191731B (en) * | 1984-12-19 | 1987-04-28 | Telefongyar | Circuit arrangement for generating system carrier, line pilot and channel carrier-control frequencies of multichannel open cable telephon equipments |
| HU191730B (en) * | 1984-12-19 | 1987-04-28 | Telefongyar | Circuit arrangement for generating channel carrier, pilot, system carrier and carrier-receiver frequencies of the multichannel carrier-current telephone equipments of premodulation system |
| JPH0413868Y2 (ja) * | 1988-11-29 | 1992-03-30 | ||
| US5907597A (en) * | 1994-08-05 | 1999-05-25 | Smart Tone Authentication, Inc. | Method and system for the secure communication of data |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3215860A (en) * | 1962-11-23 | 1965-11-02 | Epsco Inc | Clock pulse controlled sine wave synthesizer |
| FR1496141A (fr) * | 1966-06-03 | 1967-09-29 | Cit Alcatel | Générateur d'ondes modulées en fréquence |
| US3551826A (en) * | 1968-05-16 | 1970-12-29 | Raytheon Co | Frequency multiplier and frequency waveform generator |
| US3623160A (en) * | 1969-09-17 | 1971-11-23 | Sanders Associates Inc | Data modulator employing sinusoidal synthesis |
| US3657657A (en) * | 1970-08-03 | 1972-04-18 | William T Jefferson | Digital sine wave generator |
| NL7107040A (ja) * | 1971-05-22 | 1972-11-24 | ||
| US3752973A (en) * | 1971-06-30 | 1973-08-14 | Leybold Heraeus Verwaltung | Apparatus for producing voltage functions |
-
1972
- 1972-06-10 NL NL7207933.A patent/NL160687C/xx not_active IP Right Cessation
-
1973
- 1973-05-29 US US00364969A patent/US3832639A/en not_active Expired - Lifetime
- 1973-06-06 CA CA173,408A patent/CA1001236A/en not_active Expired
- 1973-06-07 JP JP48063461A patent/JPS5748883B2/ja not_active Expired
- 1973-06-07 DE DE19732328992 patent/DE2328992C3/de not_active Expired
- 1973-06-07 DK DK316273A patent/DK143676C/da active
- 1973-06-07 IT IT50551/73A patent/IT986136B/it active
- 1973-06-07 FR FR7320707A patent/FR2188360B1/fr not_active Expired
- 1973-06-07 GB GB2717473A patent/GB1399200A/en not_active Expired
- 1973-06-08 BE BE132123A patent/BE800738A/xx not_active IP Right Cessation
- 1973-06-08 ES ES415718A patent/ES415718A1/es not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE2328992C3 (de) | 1977-11-24 |
| CA1001236A (en) | 1976-12-07 |
| DK143676B (da) | 1981-09-21 |
| NL160687C (nl) | 1979-11-15 |
| GB1399200A (en) | 1975-06-25 |
| NL160687B (nl) | 1979-06-15 |
| BE800738A (fr) | 1973-12-10 |
| DE2328992A1 (de) | 1973-12-20 |
| DE2328992B2 (de) | 1977-04-14 |
| JPS5748883B2 (ja) | 1982-10-19 |
| FR2188360A1 (ja) | 1974-01-18 |
| JPS4951854A (ja) | 1974-05-20 |
| US3832639A (en) | 1974-08-27 |
| NL7207933A (ja) | 1973-12-12 |
| ES415718A1 (es) | 1976-02-01 |
| FR2188360B1 (ja) | 1983-05-06 |
| DK143676C (da) | 1982-03-01 |
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