IT1119597B - Rivelatore per segnali a multifrequenza - Google Patents
Rivelatore per segnali a multifrequenzaInfo
- Publication number
- IT1119597B IT1119597B IT69354/79A IT6935479A IT1119597B IT 1119597 B IT1119597 B IT 1119597B IT 69354/79 A IT69354/79 A IT 69354/79A IT 6935479 A IT6935479 A IT 6935479A IT 1119597 B IT1119597 B IT 1119597B
- Authority
- IT
- Italy
- Prior art keywords
- detector
- multifrequency signals
- multifrequency
- signals
- 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
- H04Q1/453—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Interface Circuits In Exchanges (AREA)
- Telephone Function (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US05/967,272 US4227055A (en) | 1978-12-07 | 1978-12-07 | Multifrequency receiver |
Publications (2)
Publication Number | Publication Date |
---|---|
IT7969354A0 IT7969354A0 (it) | 1979-12-06 |
IT1119597B true IT1119597B (it) | 1986-03-10 |
Family
ID=25512549
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IT69354/79A IT1119597B (it) | 1978-12-07 | 1979-12-06 | Rivelatore per segnali a multifrequenza |
Country Status (14)
Country | Link |
---|---|
US (1) | US4227055A (it) |
JP (1) | JPH0763191B2 (it) |
AU (1) | AU533928B2 (it) |
BE (1) | BE880466A (it) |
CA (1) | CA1142280A (it) |
CH (1) | CH647905A5 (it) |
DE (1) | DE2948676C2 (it) |
ES (1) | ES486655A1 (it) |
FR (1) | FR2443783B1 (it) |
GB (1) | GB2035757B (it) |
IL (1) | IL58853A (it) |
IT (1) | IT1119597B (it) |
NL (1) | NL190463C (it) |
SE (1) | SE437101B (it) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4385208A (en) * | 1981-04-15 | 1983-05-24 | Bell Telephone Laboratories, Incorporated | Multifrequency receiver |
JPS58173948U (ja) * | 1982-05-18 | 1983-11-21 | 沖電気工業株式会社 | 多チヤンネルバ−スト信号受信回路 |
US4460808A (en) * | 1982-08-23 | 1984-07-17 | At&T Bell Laboratories | Adaptive signal receiving method and apparatus |
US4686699A (en) * | 1984-12-21 | 1987-08-11 | International Business Machines Corporation | Call progress monitor for a computer telephone interface |
US4679224A (en) * | 1985-12-02 | 1987-07-07 | Keptel, Inc. | Telephone line testing circuit |
US4696031A (en) * | 1985-12-31 | 1987-09-22 | Wang Laboratories, Inc. | Signal detection and discrimination using waveform peak factor |
JPS6386945A (ja) * | 1986-09-30 | 1988-04-18 | Toshiba Corp | キ−入力確認音発生装置 |
US4786168A (en) * | 1986-11-24 | 1988-11-22 | The United States Of America As Represented By The United States National Aeronautics And Space Administration | Frequency domain laser velocimeter signal processor |
DE4126815A1 (de) * | 1991-08-09 | 1993-02-11 | Hagenuk Telecom Gmbh | Sprachdecodierungssystem mit dtmf-regenerator und verfahren zur regenerierung eines dtmf-signals |
US7190771B2 (en) * | 2000-02-04 | 2007-03-13 | Edge Access, Inc. | Internet telephony devices with circuity to announce incoming calls |
US6724834B2 (en) * | 2002-02-22 | 2004-04-20 | Albert L. Garrett | Threshold detector for detecting synchronization signals at correlator output during packet acquisition |
US8461986B2 (en) * | 2007-12-14 | 2013-06-11 | Wayne Harvey Snyder | Audible event detector and analyzer for annunciating to the hearing impaired |
US8804700B2 (en) * | 2008-07-16 | 2014-08-12 | Freescale Semiconductor, Inc. | Method and apparatus for detecting one or more predetermined tones transmitted over a communication network |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3743950A (en) * | 1972-03-03 | 1973-07-03 | Itt | Threshold detector for a voice frequency receiver |
US3875347A (en) * | 1973-10-01 | 1975-04-01 | Gte Automatic Electric Lab Inc | Multifrequency signal receiver |
US3942038A (en) * | 1974-11-21 | 1976-03-02 | Honeywell Inc. | Threshold gate having a variable threshold level |
SE396684B (sv) * | 1976-02-09 | 1977-09-26 | Ericsson Telefon Ab L M | Hallkrets i en mottagaranordning for mfc-signalering |
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 |
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 |
US4091243A (en) * | 1977-07-26 | 1978-05-23 | Bell Telephone Laboratories, Incorporated | Multifrequency signal receiver |
-
1978
- 1978-12-07 US US05/967,272 patent/US4227055A/en not_active Expired - Lifetime
-
1979
- 1979-11-30 SE SE7909903A patent/SE437101B/xx not_active IP Right Cessation
- 1979-12-03 IL IL58853A patent/IL58853A/xx unknown
- 1979-12-04 GB GB7941719A patent/GB2035757B/en not_active Expired
- 1979-12-04 AU AU53459/79A patent/AU533928B2/en not_active Expired
- 1979-12-04 DE DE2948676A patent/DE2948676C2/de not_active Expired
- 1979-12-05 CA CA000341243A patent/CA1142280A/en not_active Expired
- 1979-12-06 BE BE0/198450A patent/BE880466A/fr not_active IP Right Cessation
- 1979-12-06 ES ES486655A patent/ES486655A1/es not_active Expired
- 1979-12-06 FR FR7929964A patent/FR2443783B1/fr not_active Expired
- 1979-12-06 CH CH10844/79A patent/CH647905A5/de not_active IP Right Cessation
- 1979-12-06 NL NLAANVRAGE7908831,A patent/NL190463C/xx not_active IP Right Cessation
- 1979-12-06 IT IT69354/79A patent/IT1119597B/it active
- 1979-12-07 JP JP54158204A patent/JPH0763191B2/ja not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
NL190463C (nl) | 1994-03-01 |
DE2948676A1 (de) | 1980-06-19 |
BE880466A (fr) | 1980-04-01 |
NL190463B (nl) | 1993-10-01 |
JPS55102961A (en) | 1980-08-06 |
ES486655A1 (es) | 1980-06-16 |
IT7969354A0 (it) | 1979-12-06 |
GB2035757A (en) | 1980-06-18 |
FR2443783A1 (fr) | 1980-07-04 |
IL58853A (en) | 1982-04-30 |
DE2948676C2 (de) | 1984-11-29 |
IL58853A0 (en) | 1980-03-31 |
SE7909903L (sv) | 1980-06-08 |
JPH0763191B2 (ja) | 1995-07-05 |
SE437101B (sv) | 1985-02-04 |
GB2035757B (en) | 1982-12-01 |
AU5345979A (en) | 1980-06-12 |
US4227055A (en) | 1980-10-07 |
FR2443783B1 (fr) | 1986-10-03 |
AU533928B2 (en) | 1983-12-22 |
CA1142280A (en) | 1983-03-01 |
CH647905A5 (de) | 1985-02-15 |
NL7908831A (nl) | 1980-06-10 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
TA | Fee payment date (situation as of event date), data collected since 19931001 |
Effective date: 19961223 |