DE2961258D1 - Method and device for detecting the presence of one or more mfc-frequencies within a pcm-signal - Google Patents
Method and device for detecting the presence of one or more mfc-frequencies within a pcm-signalInfo
- Publication number
- DE2961258D1 DE2961258D1 DE7979200473T DE2961258T DE2961258D1 DE 2961258 D1 DE2961258 D1 DE 2961258D1 DE 7979200473 T DE7979200473 T DE 7979200473T DE 2961258 T DE2961258 T DE 2961258T DE 2961258 D1 DE2961258 D1 DE 2961258D1
- Authority
- DE
- Germany
- Prior art keywords
- mfc
- pcm
- frequencies
- detecting
- signal
- 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
- H04Q1/457—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)
- Time-Division Multiplex Systems (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NLAANVRAGE7809213,A NL177169B (nl) | 1978-09-08 | 1978-09-08 | Inrichting om de aanwezigheid vast te stellen van een of meer van een aantal frequenties in pulscode-gemoduleerde signalen. |
Publications (1)
Publication Number | Publication Date |
---|---|
DE2961258D1 true DE2961258D1 (en) | 1982-01-14 |
Family
ID=19831513
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE7979200473T Expired DE2961258D1 (en) | 1978-09-08 | 1979-08-29 | Method and device for detecting the presence of one or more mfc-frequencies within a pcm-signal |
Country Status (4)
Country | Link |
---|---|
US (1) | US4279017A (de) |
EP (1) | EP0010783B1 (de) |
DE (1) | DE2961258D1 (de) |
NL (1) | NL177169B (de) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2485843B1 (fr) * | 1980-06-25 | 1986-11-07 | Cit Alcatel | Recepteur numerique de frequences |
GB2095013B (en) * | 1981-03-18 | 1984-10-17 | Philips Electronic Associated | Multi-tone sequential call signal detector |
US4519072A (en) * | 1982-11-10 | 1985-05-21 | Rockwell International Corporation | Answer supervision system |
US4730257A (en) * | 1985-01-25 | 1988-03-08 | Szeto Lai Wan M | Apparatus for analyzing signals, to obtain parameters of constituents |
US4901244A (en) * | 1985-01-25 | 1990-02-13 | Szeto Lai Wan M | Apparatus for, and method of, analyzing signals |
JPH0884161A (ja) * | 1994-09-13 | 1996-03-26 | Fuji Electric Co Ltd | バイフェーズ符号を用いたシリアル通信装置用の受信検知回路装置 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL154386B (nl) * | 1972-04-17 | 1977-08-15 | Nederlanden Staat | Signaleringsstelsel. |
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 |
US3962645A (en) * | 1974-11-06 | 1976-06-08 | General Electric Company | Tone frequency detecting circuit |
FR2299769A1 (fr) * | 1975-01-31 | 1976-08-27 | Telecommunications Sa | Procede d'application |
NL170797C (nl) * | 1975-11-18 | 1982-12-16 | Nederlanden Staat | Inrichting voor het detecteren van een signaal. |
-
1978
- 1978-09-08 NL NLAANVRAGE7809213,A patent/NL177169B/xx not_active IP Right Cessation
-
1979
- 1979-08-21 US US06/068,406 patent/US4279017A/en not_active Expired - Lifetime
- 1979-08-29 EP EP79200473A patent/EP0010783B1/de not_active Expired
- 1979-08-29 DE DE7979200473T patent/DE2961258D1/de not_active Expired
Also Published As
Publication number | Publication date |
---|---|
NL177169B (nl) | 1985-03-01 |
EP0010783A1 (de) | 1980-05-14 |
EP0010783B1 (de) | 1981-11-04 |
US4279017A (en) | 1981-07-14 |
NL7809213A (nl) | 1980-03-11 |
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DE2961258D1 (en) | Method and device for detecting the presence of one or more mfc-frequencies within a pcm-signal | |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8339 | Ceased/non-payment of the annual fee |