ES455586A1 - Perfeccionamientos introducidos en un circuito de retencion en receptor de senales mfc. - Google Patents
Perfeccionamientos introducidos en un circuito de retencion en receptor de senales mfc.Info
- Publication number
- ES455586A1 ES455586A1 ES455586A ES455586A ES455586A1 ES 455586 A1 ES455586 A1 ES 455586A1 ES 455586 A ES455586 A ES 455586A ES 455586 A ES455586 A ES 455586A ES 455586 A1 ES455586 A1 ES 455586A1
- Authority
- ES
- Spain
- Prior art keywords
- signal
- level
- circuit
- incoming
- receiver
- 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
- 230000001419 dependent effect Effects 0.000 abstract 1
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
- H04Q1/46—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies comprising means for distinguishing between a signalling current of predetermined frequency and a complex current containing that frequency, e.g. speech current
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Noise Elimination (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Circuits Of Receivers In General (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
Abstract
Perfeccionamientos introducidos en un circuito de retención en un receptor de señales MFC para la detección de dos frecuencias vocales en una señal de tono insensible a perturbaciones, cuyo receptor incluye un número de canales de señal en paralelo igual al número de frecuencias vocales posibles contenidas en la señal de tono entrante, consistiendo cada uno de los canales de señal en un filtro de pasa banda, un dispositivo rectificador y un comparador de señal analógica para la comparación de la señal obtenida del dispositivo rectificador con una señal de referencia, caracterizados porque el circuito comprende un primer canal de señal que contiene un rectificador de onda completa conectado a una de las entradas de un circuito puerta cuya segunda entrada está conectada a un primer valor de umbral con el fin de producir un nivel de referencia en dependencia del valor de la señal entrante, un segundo canal de señal que contiene un primer circuito comparador y un circuito temporizador para la comparación del valor instantáneo de la señal entrante con dicho nivel de referencia y para producir una señal cuyo nivel está en dependencia de la duración de la señal de tono entrante, un segundo circuito comparador para la comparación del nivel de la señal así obtenida con un segundo nivel de umbral, excediendo el nivel de la señal de salida del circuito temporizador al segundo nivel de umbral, lo cual implica que el nivel de señal de salida del segundo circuito comparador cambia desde un nivel alto escogido de modo que sea mayor que el nivel más alto de la señal entrante a un nivel bajo, y un segundo circuito puerta conectado a dichos primero y segundo canales de señal para producir dicha señal de referencia que consiste en la señal de salida de los dos canales de señal que tiene el nivel más alto.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE7601387A SE396684B (sv) | 1976-02-09 | 1976-02-09 | Hallkrets i en mottagaranordning for mfc-signalering |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| ES455586A1 true ES455586A1 (es) | 1978-02-01 |
Family
ID=20326947
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ES455586A Expired ES455586A1 (es) | 1976-02-09 | 1977-02-02 | Perfeccionamientos introducidos en un circuito de retencion en receptor de senales mfc. |
Country Status (21)
| Country | Link |
|---|---|
| US (1) | US4082924A (es) |
| AR (1) | AR211163A1 (es) |
| AU (1) | AU503870B2 (es) |
| BR (1) | BR7700685A (es) |
| CA (1) | CA1059246A (es) |
| DE (1) | DE2701836A1 (es) |
| DK (1) | DK140918B (es) |
| EG (1) | EG13214A (es) |
| ES (1) | ES455586A1 (es) |
| FI (1) | FI60801C (es) |
| FR (1) | FR2340659A1 (es) |
| GB (1) | GB1518473A (es) |
| HU (1) | HU177201B (es) |
| IE (1) | IE44338B1 (es) |
| IN (1) | IN146386B (es) |
| IT (1) | IT1077617B (es) |
| NL (1) | NL187330C (es) |
| NO (1) | NO145122C (es) |
| SE (1) | SE396684B (es) |
| SU (1) | SU713548A3 (es) |
| YU (1) | YU40160B (es) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE397763B (sv) * | 1976-03-09 | 1977-11-14 | Ericsson Telefon Ab L M | Mottagaranordning for storningskenslig detektering av atminstone tva tonfrekvenser i en inkommande tonsignal |
| US4227055A (en) * | 1978-12-07 | 1980-10-07 | Bell Telephone Laboratories, Incorporated | Multifrequency receiver |
| DE2938981A1 (de) * | 1979-09-26 | 1981-04-30 | Siemens AG, 1000 Berlin und 8000 München | Schaltungsanordnung zur registrierung des schaltzustandes in einem insbesondere durch teilnehmeranschlussleitungen von fernsprechvermittlungsanlagen gebildeten schaltkreis |
| US4398147A (en) * | 1981-04-15 | 1983-08-09 | Western Electric Company, Inc. | Methods of testing multifrequency dialing signals |
| GB2132046A (en) * | 1982-10-26 | 1984-06-27 | Voice Microsystems Ltd | Improvements in or relating to state variable filters |
| US20080061842A1 (en) * | 2006-09-07 | 2008-03-13 | Micron Technology, Inc. | Circuit and method for detecting timed amplitude reduction of a signal relative to a threshold voltage |
| US7560959B2 (en) * | 2006-09-18 | 2009-07-14 | Micron Technology, Inc. | Absolute value peak differential voltage detector circuit and method |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1342904A (en) * | 1970-07-31 | 1974-01-10 | Plessey Telecommunications Res | Multifrequency data receivers |
| NL7101521A (es) * | 1971-02-05 | 1972-08-08 | ||
| US3934096A (en) * | 1973-04-27 | 1976-01-20 | Hitachi, Ltd. | Multi-frequency signal receiving circuit |
| US3875347A (en) * | 1973-10-01 | 1975-04-01 | Gte Automatic Electric Lab Inc | Multifrequency signal receiver |
| DE2517024C3 (de) * | 1975-04-17 | 1978-03-02 | Standard Elektrik Lorenz Ag, 7000 Stuttgart | Schaltungsanordnung für einen Signalempfänger zum Sperren von Signalen, deren Pegel schwankt |
-
1976
- 1976-02-09 SE SE7601387A patent/SE396684B/xx not_active IP Right Cessation
- 1976-12-28 IN IN2273/CAL/76A patent/IN146386B/en unknown
- 1976-12-30 US US05/755,826 patent/US4082924A/en not_active Expired - Lifetime
-
1977
- 1977-01-04 FI FI770020A patent/FI60801C/sv not_active IP Right Cessation
- 1977-01-06 CA CA269,274A patent/CA1059246A/en not_active Expired
- 1977-01-13 NL NLAANVRAGE7700323,A patent/NL187330C/xx not_active IP Right Cessation
- 1977-01-18 DE DE19772701836 patent/DE2701836A1/de not_active Ceased
- 1977-01-19 AU AU21437/77A patent/AU503870B2/en not_active Expired
- 1977-01-25 SU SU772448754A patent/SU713548A3/ru active
- 1977-01-26 AR AR266315A patent/AR211163A1/es active
- 1977-01-28 FR FR7702549A patent/FR2340659A1/fr active Granted
- 1977-01-31 IE IE201/77A patent/IE44338B1/en not_active IP Right Cessation
- 1977-02-01 GB GB4112/77A patent/GB1518473A/en not_active Expired
- 1977-02-02 ES ES455586A patent/ES455586A1/es not_active Expired
- 1977-02-04 BR BR7700685A patent/BR7700685A/pt unknown
- 1977-02-05 EG EG65/77A patent/EG13214A/xx active
- 1977-02-08 DK DK52077AA patent/DK140918B/da not_active IP Right Cessation
- 1977-02-08 HU HU77EI726A patent/HU177201B/hu unknown
- 1977-02-08 NO NO770410A patent/NO145122C/no unknown
- 1977-02-08 YU YU334/77A patent/YU40160B/xx unknown
- 1977-02-09 IT IT20103/77A patent/IT1077617B/it active
Also Published As
| Publication number | Publication date |
|---|---|
| NO145122B (no) | 1981-10-05 |
| IE44338B1 (en) | 1981-10-21 |
| CA1059246A (en) | 1979-07-24 |
| SE7601387L (sv) | 1977-08-10 |
| AR211163A1 (es) | 1977-10-31 |
| BR7700685A (pt) | 1977-10-11 |
| NO770410L (no) | 1977-08-10 |
| EG13214A (en) | 1980-07-31 |
| FI60801C (fi) | 1982-03-10 |
| AU503870B2 (en) | 1979-09-27 |
| NL7700323A (nl) | 1977-08-11 |
| FR2340659B1 (es) | 1983-09-09 |
| IN146386B (es) | 1979-05-19 |
| GB1518473A (en) | 1978-07-19 |
| DK140918B (da) | 1979-12-03 |
| AU2143777A (en) | 1978-07-27 |
| FI60801B (fi) | 1981-11-30 |
| DK140918C (es) | 1980-05-19 |
| DE2701836A1 (de) | 1977-08-11 |
| SE396684B (sv) | 1977-09-26 |
| DK52077A (es) | 1977-08-10 |
| SU713548A3 (ru) | 1980-01-30 |
| FI770020A (es) | 1977-08-10 |
| YU33477A (en) | 1982-05-31 |
| YU40160B (en) | 1985-08-31 |
| US4082924A (en) | 1978-04-04 |
| NO145122C (no) | 1982-01-13 |
| IE44338L (en) | 1977-08-09 |
| FR2340659A1 (fr) | 1977-09-02 |
| NL187330C (nl) | 1991-08-16 |
| HU177201B (en) | 1981-08-28 |
| IT1077617B (it) | 1985-05-04 |
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