CH655419B - - Google Patents
Info
- Publication number
- CH655419B CH655419B CH325380A CH325380A CH655419B CH 655419 B CH655419 B CH 655419B CH 325380 A CH325380 A CH 325380A CH 325380 A CH325380 A CH 325380A CH 655419 B CH655419 B CH 655419B
- Authority
- CH
- Switzerland
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
- H04Q1/457—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling with conversion of multifrequency signals into digital signals
- H04Q1/4575—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling with conversion of multifrequency signals into digital signals which are transmitted in digital form
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Time-Division Multiplex Systems (AREA)
- Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL7903346A NL7903346A (nl) | 1979-04-27 | 1979-04-27 | Digitaal signaleringsstelsel. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH655419B true CH655419B (US07655688-20100202-C00086.png) | 1986-04-15 |
Family
ID=19833070
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH325380A CH655419B (US07655688-20100202-C00086.png) | 1979-04-27 | 1980-04-28 |
Country Status (13)
Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2512306A1 (fr) * | 1981-08-27 | 1983-03-04 | Telecommunications Sa | Dispositif numerique de reconnaissance de frequences |
| NL8200051A (nl) * | 1982-01-08 | 1983-08-01 | Philips Nv | Inrichting en werkwijze voor het detecteren van multifrequentie tooncodesignalen. |
| NL8502008A (nl) * | 1985-07-12 | 1987-02-02 | Philips Nv | Ontvanginrichting voor het onder bescherming van een stoorsignaal/spraaksignaalbewakingsfunctie herkennen van een aantal verschillende en voorafbepaalde frequentiecombinaties van toonfrequente signaleringscomponenten. |
| DD259987A3 (de) * | 1986-07-07 | 1988-09-14 | Rft Nachrichtenelektronik Albe | Verfahren und anordnung zum sprachschutz in mfc-tastwahlempfaengern |
| US4845499A (en) * | 1987-11-02 | 1989-07-04 | Ag Communication Systems Corporation | Method for generating PCM logarithmic values from linear values |
| GB2241853A (en) * | 1990-03-08 | 1991-09-11 | British Aerospace | Digital signal processing apparatus comprising architectures for digital multiplexing and demultiplexing. |
| US5602874A (en) * | 1994-12-29 | 1997-02-11 | Motorola, Inc. | Method and apparatus for reducing quantization noise |
| US5754597A (en) * | 1994-12-29 | 1998-05-19 | Motorola, Inc. | Method and apparatus for routing a digitized RF signal to a plurality of paths |
| WO1996021292A1 (en) * | 1994-12-29 | 1996-07-11 | Motorola Inc. | Wideband frequency signal digitizer and method |
| US5854813A (en) * | 1994-12-29 | 1998-12-29 | Motorola, Inc. | Multiple access up converter/modulator and method |
| US5579341A (en) * | 1994-12-29 | 1996-11-26 | Motorola, Inc. | Multi-channel digital transceiver and method |
| US5748683A (en) * | 1994-12-29 | 1998-05-05 | Motorola, Inc. | Multi-channel transceiver having an adaptive antenna array and method |
| US5668836A (en) * | 1994-12-29 | 1997-09-16 | Motorola, Inc. | Split frequency band signal digitizer and method |
| US5710763A (en) * | 1995-07-31 | 1998-01-20 | Motorola, Inc. | Filtered fast Fourier transmultiplexer and method |
| GB2330727B (en) * | 1997-10-24 | 2002-10-09 | Mitel Corp | Tone and periodical signal detection |
| US7623826B2 (en) * | 2004-07-22 | 2009-11-24 | Frank Pergal | Wireless repeater with arbitrary programmable selectivity |
| US10133549B1 (en) * | 2017-12-04 | 2018-11-20 | Kyocera Document Solutions Inc. | Systems and methods for implementing a synchronous FIFO with registered outputs |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3150232A (en) * | 1961-02-06 | 1964-09-22 | Edward R Schmidt | Variable damping circuits |
| US3436487A (en) * | 1965-09-14 | 1969-04-01 | Bell Telephone Labor Inc | Telephone signaling arrangement |
| FR2141502B1 (US07655688-20100202-C00086.png) * | 1971-06-01 | 1973-06-29 | Ibm France | |
| US3863030A (en) * | 1972-06-01 | 1975-01-28 | Gte Automatic Electric Lab Inc | Pcm tone receiver using digital spectrum analysis |
| FR2191827A5 (US07655688-20100202-C00086.png) * | 1972-06-27 | 1974-02-01 | Socotel Mixte D Veloppem | |
| US3824471A (en) * | 1972-12-01 | 1974-07-16 | Gte Automatic Electric Lab Inc | Pcm tone receiver using floating-point digital spectrum analysis |
| NL7312548A (nl) * | 1973-09-12 | 1975-03-14 | Bell Telephone Mfg | Multifrequent signaleringsstelsel. |
| FR2295665A1 (fr) * | 1974-12-18 | 1976-07-16 | Labo Cent Telecommunicat | Recepteur numerique de signaux multifrequences |
| FR2299769A1 (fr) * | 1975-01-31 | 1976-08-27 | Telecommunications Sa | Procede d'application |
| DE2553258C3 (de) * | 1975-11-27 | 1980-07-03 | Standard Elektrik Lorenz Ag, 7000 Stuttgart | Schaltungsanordnung für einen digitalen Mehrfrequenz-Zeichenempfänger |
| IT1072242B (it) * | 1976-12-17 | 1985-04-10 | Cselt Centro Studi Lab Telecom | Procedimento e dispositivo per il riconoscimento di segnali telefonici in codice multifrequenza convertiti in forma numerica |
-
1979
- 1979-04-27 NL NL7903346A patent/NL7903346A/nl not_active Application Discontinuation
-
1980
- 1980-04-22 AU AU57671/80A patent/AU539806B2/en not_active Ceased
- 1980-04-23 DE DE3015567A patent/DE3015567C2/de not_active Expired
- 1980-04-23 US US06/143,055 patent/US4355405A/en not_active Expired - Lifetime
- 1980-04-24 IT IT21664/80A patent/IT1196912B/it active
- 1980-04-24 BE BE2/58529A patent/BE882941A/nl not_active IP Right Cessation
- 1980-04-25 MX MX182107A patent/MX149459A/es unknown
- 1980-04-25 AR AR280818A patent/AR228738A1/es active
- 1980-04-25 ES ES490898A patent/ES490898A0/es active Granted
- 1980-04-28 CH CH325380A patent/CH655419B/de unknown
- 1980-04-28 FR FR8009534A patent/FR2455405B1/fr not_active Expired
- 1980-04-28 JP JP5553680A patent/JPS55159688A/ja active Granted
- 1980-04-28 BR BR8002591A patent/BR8002591A/pt unknown
Also Published As
| Publication number | Publication date |
|---|---|
| MX149459A (es) | 1983-11-08 |
| BR8002591A (pt) | 1980-12-09 |
| DE3015567C2 (de) | 1986-09-11 |
| BE882941A (nl) | 1980-10-24 |
| IT1196912B (it) | 1988-11-25 |
| FR2455405B1 (fr) | 1987-08-07 |
| IT8021664A0 (it) | 1980-04-24 |
| JPH0127640B2 (US07655688-20100202-C00086.png) | 1989-05-30 |
| DE3015567A1 (de) | 1980-11-13 |
| NL7903346A (nl) | 1980-10-29 |
| JPS55159688A (en) | 1980-12-11 |
| FR2455405A1 (fr) | 1980-11-21 |
| ES8101290A1 (es) | 1980-12-01 |
| AU5767180A (en) | 1980-10-30 |
| AR228738A1 (es) | 1983-04-15 |
| ES490898A0 (es) | 1980-12-01 |
| AU539806B2 (en) | 1984-10-18 |
| US4355405A (en) | 1982-10-19 |
