ES472043A1 - Perfeccionamientos en aparatos para detectar la recepcion desenales de frecuencias multiples - Google Patents
Perfeccionamientos en aparatos para detectar la recepcion desenales de frecuencias multiplesInfo
- Publication number
- ES472043A1 ES472043A1 ES472043A ES472043A ES472043A1 ES 472043 A1 ES472043 A1 ES 472043A1 ES 472043 A ES472043 A ES 472043A ES 472043 A ES472043 A ES 472043A ES 472043 A1 ES472043 A1 ES 472043A1
- Authority
- ES
- Spain
- Prior art keywords
- level
- detection
- threshold level
- signal receiver
- prescribed
- Prior art date
- 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
- 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)
Abstract
Perfeccionamientos en aparatos para detectar la recepción de señales de frecuencias múltiples, del tipo que comprenden una pluralidad de filtros para pasar tonos de frecuencias múltiples individuales de una señal recibida de ganancia ajustada, caracterizados porque se disponen medios detectores de umbral, controlables en relación circuito con la pluralidad de filtros para generar señales de salida indicativas de tonos de frecuencias múltiples recibidos individuales que tienen amplitudes mayores que los niveles umbrales predeterminados, y medios de control para generar señales y controlar al dispositivo detector umbral controlable con el fin de detectar señales que tengan amplitudes mayores que el primer y segundo niveles de umbral de referencia predeterminados según criterio determinados y para valorar las señales de salida de los medios detectores de umbral controlables con el fin de determinar si se han recibido solamente dos tonos durante por lo menos un intervalo de tiempo mínimo, predeterminado.
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 |
---|---|
ES472043A1 true ES472043A1 (es) | 1979-02-01 |
Family
ID=25227234
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ES472043A Expired ES472043A1 (es) | 1977-07-26 | 1978-07-26 | Perfeccionamientos en aparatos para detectar la recepcion desenales de frecuencias multiples |
Country Status (13)
Country | Link |
---|---|
US (1) | US4091243A (es) |
JP (1) | JPS5424509A (es) |
AU (1) | AU3819478A (es) |
BE (1) | BE869241A (es) |
CA (1) | CA1102887A (es) |
ES (1) | ES472043A1 (es) |
FR (1) | FR2399175A1 (es) |
GB (1) | GB2021354A (es) |
IL (1) | IL55197A (es) |
IT (1) | IT1097368B (es) |
NL (1) | NL7807863A (es) |
SE (1) | SE7902501L (es) |
WO (1) | WO1979000066A1 (es) |
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 GB GB7906993A patent/GB2021354A/en not_active Withdrawn
- 1978-07-20 AU AU38194/78A patent/AU3819478A/en active Pending
- 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 ES ES472043A patent/ES472043A1/es not_active Expired
- 1978-07-26 FR FR7822120A patent/FR2399175A1/fr active Pending
-
1979
- 1979-03-20 SE SE7902501A patent/SE7902501L/sv unknown
Also Published As
Publication number | Publication date |
---|---|
GB2021354A (en) | 1979-11-28 |
IT1097368B (it) | 1985-08-31 |
IL55197A0 (en) | 1978-09-29 |
CA1102887A (en) | 1981-06-09 |
IT7826073A0 (it) | 1978-07-25 |
WO1979000066A1 (en) | 1979-02-22 |
SE7902501L (es) | 1979-03-20 |
IL55197A (en) | 1980-05-30 |
BE869241A (fr) | 1978-11-16 |
JPS5424509A (en) | 1979-02-23 |
FR2399175A1 (fr) | 1979-02-23 |
US4091243A (en) | 1978-05-23 |
NL7807863A (nl) | 1979-01-30 |
AU3819478A (en) | 1980-01-24 |
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