SE402849B - Flerfrekvenssignalmottagare - Google Patents
FlerfrekvenssignalmottagareInfo
- Publication number
- SE402849B SE402849B SE7514214A SE7514214A SE402849B SE 402849 B SE402849 B SE 402849B SE 7514214 A SE7514214 A SE 7514214A SE 7514214 A SE7514214 A SE 7514214A SE 402849 B SE402849 B SE 402849B
- Authority
- SE
- Sweden
- Prior art keywords
- signal receiver
- multifrequency signal
- multifrequency
- receiver
- signal
- Prior art date
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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Radar Systems Or Details Thereof (AREA)
- Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14777274A JPS5731716B2 (ja) | 1974-12-23 | 1974-12-23 |
Publications (2)
Publication Number | Publication Date |
---|---|
SE7514214L SE7514214L (sv) | 1976-06-24 |
SE402849B true SE402849B (sv) | 1978-07-17 |
Family
ID=15437820
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE7514214A SE402849B (sv) | 1974-12-23 | 1975-12-16 | Flerfrekvenssignalmottagare |
Country Status (4)
Country | Link |
---|---|
US (1) | US4025730A (ja) |
JP (1) | JPS5731716B2 (ja) |
DE (1) | DE2558402C3 (ja) |
SE (1) | SE402849B (ja) |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL7511707A (nl) * | 1975-10-06 | 1977-04-12 | Philips Nv | Kruiscorrelatie-inrichting. |
US4185172A (en) * | 1976-12-17 | 1980-01-22 | Cselt - Centro Studi E Laboratori Telecomunicazioni S.P.A. | Method of and means for detecting digitized multi frequency-coded signals |
CA1100641A (en) * | 1977-09-16 | 1981-05-05 | Akira Ichikawa | Multifrequency signal receiving system |
FR2409652A1 (fr) * | 1977-11-18 | 1979-06-15 | Materiel Telephonique | Recepteur de signaux numeriques multifrequences codes |
GB2032737A (en) * | 1978-10-24 | 1980-05-08 | Standard Telephones Cables Ltd | Radio receiver for tone modulated signals |
DE2939369C2 (de) * | 1979-09-28 | 1983-01-05 | Telefonbau Und Normalzeit Gmbh, 6000 Frankfurt | Verfahren zum Erkennen des Empfanges vorgegebener Tonfrequenzen |
US4333150A (en) * | 1980-01-28 | 1982-06-01 | Westinghouse Electric Corp. | Signal receiving apparatus and method |
JPS56149889A (en) * | 1980-04-23 | 1981-11-19 | Nec Corp | Push-botton telephone signal receiving system |
JPS56153897A (en) * | 1980-04-30 | 1981-11-28 | Nec Corp | Receiving device for push-button telephone signal |
FR2485843B1 (fr) * | 1980-06-25 | 1986-11-07 | Cit Alcatel | Recepteur numerique de frequences |
US4594555A (en) * | 1984-10-29 | 1986-06-10 | Hewlett-Packard Company | Frequency selective sampling detector |
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. |
US4783845A (en) * | 1985-12-20 | 1988-11-08 | Itt Aerospace Optical | Digital tone squelch detector |
JPH0757030B2 (ja) * | 1988-11-08 | 1995-06-14 | シャープ株式会社 | Dtmfレシーバ |
US5477465A (en) * | 1993-08-31 | 1995-12-19 | Talx Corporation | Multi-frequency receiver with arbitrary center frequencies |
US6020782A (en) * | 1994-05-25 | 2000-02-01 | The United States Of America As Represented By The Secretary Of The Navy | Noise assisted signal processor with nonlinearly coupled arrays of nonlinear dynamic elements |
JP2000151761A (ja) * | 1998-11-18 | 2000-05-30 | Matsushita Electric Ind Co Ltd | 電話装置 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1267272B (de) * | 1966-03-25 | 1968-05-02 | Siemens Ag | Frequenzselektiver Signalempfaenger |
US3652805A (en) * | 1969-10-10 | 1972-03-28 | Information Control Systems In | Binary frequency identification system |
US3636446A (en) * | 1970-03-04 | 1972-01-18 | H B Engineering Corp | Receiver for detecting signals within a predetermined bandwidth |
US3679882A (en) * | 1970-06-11 | 1972-07-25 | Ibm | Fourier digital filter or equalizer and method of operation therefor |
-
1974
- 1974-12-23 JP JP14777274A patent/JPS5731716B2/ja not_active Expired
-
1975
- 1975-12-16 SE SE7514214A patent/SE402849B/xx not_active IP Right Cessation
- 1975-12-22 US US05/642,822 patent/US4025730A/en not_active Expired - Lifetime
- 1975-12-23 DE DE2558402A patent/DE2558402C3/de not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE2558402A1 (de) | 1976-06-24 |
DE2558402B2 (de) | 1979-03-08 |
JPS5173809A (ja) | 1976-06-26 |
DE2558402C3 (de) | 1979-10-31 |
JPS5731716B2 (ja) | 1982-07-06 |
US4025730A (en) | 1977-05-24 |
SE7514214L (sv) | 1976-06-24 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
NUG | Patent has lapsed |
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