SE7902501L - - Google Patents
Info
- Publication number
- SE7902501L SE7902501L SE7902501A SE7902501A SE7902501L SE 7902501 L SE7902501 L SE 7902501L SE 7902501 A SE7902501 A SE 7902501A SE 7902501 A SE7902501 A SE 7902501A SE 7902501 L SE7902501 L SE 7902501L
- Authority
- SE
- Sweden
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
- H04Q1/453—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Circuits Of Receivers In General (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US05/819,112 US4091243A (en) | 1977-07-26 | 1977-07-26 | Multifrequency signal receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SE7902501L true SE7902501L (sv) | 1979-03-20 |
Family
ID=25227234
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE7902501A SE7902501L (sv) | 1977-07-26 | 1979-03-20 |
Country Status (13)
| Country | Link |
|---|---|
| US (1) | US4091243A (sv) |
| JP (1) | JPS5424509A (sv) |
| AU (1) | AU3819478A (sv) |
| BE (1) | BE869241A (sv) |
| CA (1) | CA1102887A (sv) |
| ES (1) | ES472043A1 (sv) |
| FR (1) | FR2399175A1 (sv) |
| GB (1) | GB2021354A (sv) |
| IL (1) | IL55197A (sv) |
| IT (1) | IT1097368B (sv) |
| NL (1) | NL7807863A (sv) |
| SE (1) | SE7902501L (sv) |
| WO (1) | WO1979000066A1 (sv) |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4227055A (en) * | 1978-12-07 | 1980-10-07 | Bell Telephone Laboratories, Incorporated | Multifrequency receiver |
| US4386239A (en) * | 1980-06-17 | 1983-05-31 | Bell Telephone Laboratories, Incorporated | Multifrequency tone detector |
| ZA82379B (en) * | 1981-01-28 | 1982-12-29 | Grace Gmbh | Process for producing porous materials and the use thereof |
| US4398147A (en) * | 1981-04-15 | 1983-08-09 | Western Electric Company, Inc. | Methods of testing multifrequency dialing signals |
| US4463851A (en) * | 1982-04-26 | 1984-08-07 | Meritex Plastic Inc. | Protective enclosure for electronic devices |
| US4608457A (en) * | 1984-04-11 | 1986-08-26 | Fowler Stephen L | Telecommunications device for the hearing impared |
| US4604755A (en) * | 1984-06-01 | 1986-08-05 | International Business Machines Corp. | Feed forward dual channel automatic level control for dual tone multi-frequency receivers |
| US4709297A (en) * | 1984-06-29 | 1987-11-24 | Siemens Aktiengesellschaft | Guiding device for semiconductor components with DIL casings |
| CA1239719A (en) * | 1985-11-22 | 1988-07-26 | Mitel Corporation | Dial tone detector |
| US5588052A (en) * | 1991-11-19 | 1996-12-24 | Sharp Kabushiki Kaisha | DTMF signal judging apparatus |
| EP0548438A1 (en) * | 1991-12-20 | 1993-06-30 | International Business Machines Corporation | A method for detecting dual tone multi-frequency signals and device for implementing said method |
| US5321745A (en) * | 1992-05-26 | 1994-06-14 | Vmx, Inc. | Adaptive efficient single/dual tone decoder apparatus and method for identifying call-progression signals |
| US5699421A (en) * | 1995-05-31 | 1997-12-16 | Casio Phonemate, Inc. | Telephone answering device with low cost dual tone multi-frequency detector |
| 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 |
| GB2357216B (en) * | 1999-12-11 | 2004-05-12 | Mitel Corp | Method and apparatus for detecting dual tone alerting signal in telephone systems |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1512006A1 (de) * | 1966-12-03 | 1969-02-20 | Standard Elek K Lorenz Ag | Empfangseinrichtung fuer tonfrequente Zeichen |
| US3836727A (en) * | 1972-01-27 | 1974-09-17 | Philips Corp | Signal receiver for receiving signals of different frequency |
| US3914557A (en) * | 1973-04-11 | 1975-10-21 | Bell Telephone Labor Inc | Multifrequency tone detecting arrangement |
| NL7312548A (nl) * | 1973-09-12 | 1975-03-14 | Bell Telephone Mfg | Multifrequent signaleringsstelsel. |
| US3875347A (en) * | 1973-10-01 | 1975-04-01 | Gte Automatic Electric Lab Inc | Multifrequency signal receiver |
| US3936801A (en) * | 1974-09-12 | 1976-02-03 | Bell Telephone Laboratories, Incorporated | Multifrequency signal receiver timing circuit |
| US4016370A (en) * | 1975-03-19 | 1977-04-05 | Chestel, Inc. | Digital tone decoder |
-
1977
- 1977-07-26 US US05/819,112 patent/US4091243A/en not_active Expired - Lifetime
-
1978
- 1978-06-29 CA CA306,495A patent/CA1102887A/en not_active Expired
- 1978-07-20 AU AU38194/78A patent/AU3819478A/en active Pending
- 1978-07-20 GB GB7906993A patent/GB2021354A/en not_active Withdrawn
- 1978-07-20 WO PCT/US1978/000044 patent/WO1979000066A1/en unknown
- 1978-07-21 IL IL55197A patent/IL55197A/xx unknown
- 1978-07-24 NL NL7807863A patent/NL7807863A/xx not_active Application Discontinuation
- 1978-07-25 BE BE189477A patent/BE869241A/xx unknown
- 1978-07-25 IT IT26073/78A patent/IT1097368B/it active
- 1978-07-25 JP JP9006978A patent/JPS5424509A/ja active Pending
- 1978-07-26 FR FR7822120A patent/FR2399175A1/fr active Pending
- 1978-07-26 ES ES472043A patent/ES472043A1/es not_active Expired
-
1979
- 1979-03-20 SE SE7902501A patent/SE7902501L/sv unknown
Also Published As
| Publication number | Publication date |
|---|---|
| WO1979000066A1 (en) | 1979-02-22 |
| IT7826073A0 (it) | 1978-07-25 |
| BE869241A (fr) | 1978-11-16 |
| NL7807863A (nl) | 1979-01-30 |
| US4091243A (en) | 1978-05-23 |
| IL55197A (en) | 1980-05-30 |
| ES472043A1 (es) | 1979-02-01 |
| AU3819478A (en) | 1980-01-24 |
| GB2021354A (en) | 1979-11-28 |
| JPS5424509A (en) | 1979-02-23 |
| FR2399175A1 (fr) | 1979-02-23 |
| IT1097368B (it) | 1985-08-31 |
| CA1102887A (en) | 1981-06-09 |
| IL55197A0 (en) | 1978-09-29 |