CH607516A5 - - Google Patents
Info
- Publication number
- CH607516A5 CH607516A5 CH111576A CH111576A CH607516A5 CH 607516 A5 CH607516 A5 CH 607516A5 CH 111576 A CH111576 A CH 111576A CH 111576 A CH111576 A CH 111576A CH 607516 A5 CH607516 A5 CH 607516A5
- 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)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Noise Elimination (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US05/545,410 US3937899A (en) | 1975-01-30 | 1975-01-30 | Tone detector using spectrum parameter estimation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH607516A5 true CH607516A5 (pt-PT) | 1978-12-29 |
Family
ID=24176113
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH111576A CH607516A5 (pt-PT) | 1975-01-30 | 1976-01-29 |
Country Status (12)
| Country | Link |
|---|---|
| US (1) | US3937899A (pt-PT) |
| JP (1) | JPS51100774A (pt-PT) |
| BE (1) | BE837943A (pt-PT) |
| CA (1) | CA1042108A (pt-PT) |
| CH (1) | CH607516A5 (pt-PT) |
| DE (1) | DE2602741A1 (pt-PT) |
| ES (1) | ES444691A1 (pt-PT) |
| FR (1) | FR2299647A1 (pt-PT) |
| GB (1) | GB1525651A (pt-PT) |
| IT (1) | IT1057086B (pt-PT) |
| NL (1) | NL7600799A (pt-PT) |
| SE (1) | SE403239B (pt-PT) |
Families Citing this family (30)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2287811A1 (fr) * | 1974-10-08 | 1976-05-07 | Cit Alcatel | Regulateur de niveau de type numerique |
| NL7511707A (nl) * | 1975-10-06 | 1977-04-12 | Philips Nv | Kruiscorrelatie-inrichting. |
| CA1100641A (en) * | 1977-09-16 | 1981-05-05 | Akira Ichikawa | Multifrequency signal receiving system |
| CH635695A5 (de) * | 1978-08-31 | 1983-04-15 | Landis & Gyr Ag | Detektor zur feststellung der anwesenheit mindestens eines elektrischen signals mit einer vorbestimmten charakteristik. |
| FR2485843B1 (fr) * | 1980-06-25 | 1986-11-07 | Cit Alcatel | Recepteur numerique de frequences |
| US4352194A (en) * | 1980-07-25 | 1982-09-28 | Rca Corporation | System and method for frequency discrimination |
| US4491701A (en) * | 1981-03-05 | 1985-01-01 | At&T Bell Laboratories | Adaptive filter including a far end energy discriminator |
| WO1982003144A1 (en) * | 1981-03-05 | 1982-09-16 | Western Electric Co | Energy band discriminator |
| EP0065062B1 (de) * | 1981-05-07 | 1985-08-14 | LGZ LANDIS & GYR ZUG AG | Verfahren zur Erzeugung von digitalen periodischen Zeitfunktionssignalen |
| US4468641A (en) * | 1982-06-28 | 1984-08-28 | At&T Bell Laboratories | Adaptive filter update normalization |
| US4513387A (en) * | 1982-07-13 | 1985-04-23 | Lgz Landis & Gyr Zug Ag | Method and an apparatus for generating periodic digital time function signals |
| US4519084A (en) * | 1982-09-29 | 1985-05-21 | At&T Bell Laboratories | Matched filter for combating multipath fading |
| US4577157A (en) * | 1983-12-12 | 1986-03-18 | International Telephone And Telegraph Corporation | Zero IF receiver AM/FM/PM demodulator using sampling techniques |
| US4599495A (en) * | 1985-02-28 | 1986-07-08 | Northern Telecom Limited | Apparatus for multifrequency signalling tone detection |
| US4789948A (en) * | 1985-09-13 | 1988-12-06 | Hughes Aircraft Company | Method and apparatus for determining communications link quality and receiver tracking performance |
| US4769610A (en) * | 1987-06-29 | 1988-09-06 | Motorola, Inc. | Tone decoder |
| US4975633A (en) * | 1988-04-11 | 1990-12-04 | Anritsu Corporation | Spectrum analyzer having means for displaying spectrum data together with power value thereof |
| US5068597A (en) * | 1989-10-30 | 1991-11-26 | General Electric Company | Spectral estimation utilizing a minimum free energy method with recursive reflection coefficients |
| US5457818A (en) * | 1990-06-08 | 1995-10-10 | Butler; James A. | Detection threshold adjustment method for linear matched filter receivers |
| CA2116043C (en) * | 1994-02-21 | 1997-09-23 | Alexander F. Tulai | Programmable digital call progress tone detector |
| DE10000008A1 (de) * | 2000-01-03 | 2001-07-12 | Alcatel Sa | Verfahren zur aufwandsarmen Signal-, Ton- und Phasenwechseldetektion |
| US6868116B2 (en) * | 2001-02-16 | 2005-03-15 | Nortel Networks Limited | Universal telephony tones detector |
| JP4123725B2 (ja) * | 2001-02-23 | 2008-07-23 | 沖電気工業株式会社 | トーン信号検出装置及び方法 |
| US6775629B2 (en) * | 2001-06-12 | 2004-08-10 | National Instruments Corporation | System and method for estimating one or more tones in an input signal |
| US7474973B2 (en) * | 2003-06-25 | 2009-01-06 | Variance Dynamicaz, Inc. | Apparatus and method for detecting and analyzing spectral components in predetermined frequency bands within a signal, frequency filter, and related computer-readable media |
| US7904263B2 (en) * | 2008-05-30 | 2011-03-08 | The United States Of America As Represented By The Secretary Of The Air Force | Method for automatically detecting and characterizing spectral activity |
| US20130054993A1 (en) | 2011-08-25 | 2013-02-28 | International Business Machines Corporation | Branch circuit determination with synchronous correlation |
| US9009503B2 (en) | 2012-07-05 | 2015-04-14 | International Business Machines Corporation | Branch circuit determination without external synchronization |
| US9135577B2 (en) | 2012-10-10 | 2015-09-15 | International Business Machines Corporation | Statistical determination of power-circuit connectivity |
| WO2018053525A1 (en) * | 2016-09-19 | 2018-03-22 | The University Of New Hampshire | Techniques for empirical mode decomposition (emd)-based noise estimation |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3652805A (en) * | 1969-10-10 | 1972-03-28 | Information Control Systems In | Binary frequency identification system |
| CA984068A (en) * | 1972-08-10 | 1976-02-17 | Alexander D. Proudfoot | Method and apparatus for detecting the presence of signal components of predetermined frequency in a multi-frequency signal |
-
1975
- 1975-01-30 US US05/545,410 patent/US3937899A/en not_active Expired - Lifetime
- 1975-11-06 CA CA239,103A patent/CA1042108A/en not_active Expired
-
1976
- 1976-01-22 SE SE7600641A patent/SE403239B/xx unknown
- 1976-01-26 GB GB2961/76A patent/GB1525651A/en not_active Expired
- 1976-01-26 DE DE19762602741 patent/DE2602741A1/de not_active Withdrawn
- 1976-01-27 NL NL7600799A patent/NL7600799A/xx not_active Application Discontinuation
- 1976-01-27 BE BE163831A patent/BE837943A/xx not_active IP Right Cessation
- 1976-01-28 ES ES444691A patent/ES444691A1/es not_active Expired
- 1976-01-28 IT IT67199/76A patent/IT1057086B/it active
- 1976-01-29 CH CH111576A patent/CH607516A5/xx not_active IP Right Cessation
- 1976-01-29 FR FR7602468A patent/FR2299647A1/fr active Granted
- 1976-01-29 JP JP51008052A patent/JPS51100774A/ja active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JPS51100774A (pt-PT) | 1976-09-06 |
| GB1525651A (en) | 1978-09-20 |
| US3937899A (en) | 1976-02-10 |
| DE2602741A1 (de) | 1976-08-05 |
| IT1057086B (it) | 1982-03-10 |
| SE403239B (sv) | 1978-07-31 |
| FR2299647B1 (pt-PT) | 1981-06-19 |
| NL7600799A (nl) | 1976-08-03 |
| FR2299647A1 (fr) | 1976-08-27 |
| ES444691A1 (es) | 1977-10-16 |
| BE837943A (fr) | 1976-05-14 |
| SE7600641L (sv) | 1976-08-02 |
| CA1042108A (en) | 1978-11-07 |
Similar Documents
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PL | Patent ceased |