FR2438403A1 - Decodeur de tonalite multifrequence pour la signalisation telephonique - Google Patents
Decodeur de tonalite multifrequence pour la signalisation telephoniqueInfo
- Publication number
- FR2438403A1 FR2438403A1 FR7909684A FR7909684A FR2438403A1 FR 2438403 A1 FR2438403 A1 FR 2438403A1 FR 7909684 A FR7909684 A FR 7909684A FR 7909684 A FR7909684 A FR 7909684A FR 2438403 A1 FR2438403 A1 FR 2438403A1
- Authority
- FR
- France
- Prior art keywords
- converters
- tone decoder
- frequency tone
- comparator
- telephone signaling
- 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.)
- Granted
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)
- Measurement Of Current Or Voltage (AREA)
- Devices For Supply Of Signal Current (AREA)
- Networks Using Active Elements (AREA)
- Electrophonic Musical Instruments (AREA)
- Interface Circuits In Exchanges (AREA)
- Measuring Or Testing Involving Enzymes Or Micro-Organisms (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
LE DECODEUR DE TONALITE COMPREND UN FILTRE REJECTEUR, DEUX FILTRES EN PARALLELE POUR SEPARER LES TONALITES HAUTES ET BASSES D'UNE SIGNALISATION MULTIFREQUENCES, DEUX CONVERTISSEURS PERIODE-TENSION ET UN COMPARATEUR POUR COMPARER LES AMPLITUDES DE SORTIE DES CONVERTISSEURS. IL COMPREND ENCORE UN DIVISEUR DE TENSION DEFINISSANT DES GAMMES D'AMPLITUDE PREDETERMINEES POUR LA COMPARAISON AVEC LES SORTIES DES CONVERTISSEURS, ET DES MOYENS POUR DELIVRER DES SIGNAUX INDIVIDUELS QUAND IL Y A COINCIDENCE DANS LE COMPARATEUR. UTILISABLE DANS LES RESEAUX DE COMMUNICATION, DE TELEPHONIE, ETC.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA312,903A CA1112381A (fr) | 1978-10-06 | 1978-10-06 | Circuit decodeur de tonalites |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2438403A1 true FR2438403A1 (fr) | 1980-04-30 |
FR2438403B1 FR2438403B1 (fr) | 1986-12-12 |
Family
ID=4112559
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7909684A Expired FR2438403B1 (fr) | 1978-10-06 | 1979-04-10 | Decodeur de tonalite multifrequence pour la signalisation telephonique |
Country Status (11)
Country | Link |
---|---|
US (1) | US4273965A (fr) |
JP (1) | JPS5585183A (fr) |
BE (1) | BE875698A (fr) |
CA (1) | CA1112381A (fr) |
DE (1) | DE2912566A1 (fr) |
DK (1) | DK126479A (fr) |
FR (1) | FR2438403B1 (fr) |
GB (1) | GB2032151B (fr) |
NL (1) | NL7902645A (fr) |
NO (1) | NO154210C (fr) |
SE (1) | SE439717B (fr) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4604755A (en) * | 1984-06-01 | 1986-08-05 | International Business Machines Corp. | Feed forward dual channel automatic level control for dual tone multi-frequency receivers |
US4653093A (en) * | 1985-07-26 | 1987-03-24 | Floyd Bell Associates, Inc. | Frequency selective ringer circuit |
US5095504A (en) * | 1987-10-01 | 1992-03-10 | Canon Kabushiki Kaisha | Telephone and telephone system having temporary transfer and hold-release functions |
US5699421A (en) * | 1995-05-31 | 1997-12-16 | Casio Phonemate, Inc. | Telephone answering device with low cost dual tone multi-frequency detector |
JP3452430B2 (ja) * | 1995-09-11 | 2003-09-29 | 富士通株式会社 | 情報信号検出装置および情報信号検出方法 |
CN109709383A (zh) * | 2019-03-14 | 2019-05-03 | 贵州电网有限责任公司 | 一种过电压监测装置的触发单元结构 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3780230A (en) * | 1972-11-10 | 1973-12-18 | Bell Telephone Labor Inc | Multifrequency tone receiver |
US3806664A (en) * | 1972-09-13 | 1974-04-23 | Bell Telephone Labor Inc | Tone receiver with detection of each tone in a precise frequency band |
-
1978
- 1978-10-06 CA CA312,903A patent/CA1112381A/fr not_active Expired
-
1979
- 1979-02-09 GB GB7904727A patent/GB2032151B/en not_active Expired
- 1979-03-06 NO NO790745A patent/NO154210C/no unknown
- 1979-03-06 JP JP2661279A patent/JPS5585183A/ja active Pending
- 1979-03-22 SE SE7902607A patent/SE439717B/sv not_active IP Right Cessation
- 1979-03-26 US US06/023,999 patent/US4273965A/en not_active Expired - Lifetime
- 1979-03-28 DK DK126479A patent/DK126479A/da not_active Application Discontinuation
- 1979-03-29 DE DE19792912566 patent/DE2912566A1/de not_active Withdrawn
- 1979-04-04 NL NL7902645A patent/NL7902645A/nl not_active Application Discontinuation
- 1979-04-10 FR FR7909684A patent/FR2438403B1/fr not_active Expired
- 1979-04-19 BE BE0/194701A patent/BE875698A/xx not_active IP Right Cessation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3806664A (en) * | 1972-09-13 | 1974-04-23 | Bell Telephone Labor Inc | Tone receiver with detection of each tone in a precise frequency band |
US3780230A (en) * | 1972-11-10 | 1973-12-18 | Bell Telephone Labor Inc | Multifrequency tone receiver |
Also Published As
Publication number | Publication date |
---|---|
NO154210C (no) | 1986-08-13 |
FR2438403B1 (fr) | 1986-12-12 |
NO790745L (no) | 1980-04-09 |
SE439717B (sv) | 1985-06-24 |
NO154210B (no) | 1986-04-28 |
SE7902607L (sv) | 1980-04-07 |
NL7902645A (nl) | 1980-04-09 |
US4273965A (en) | 1981-06-16 |
DE2912566A1 (de) | 1980-04-24 |
DK126479A (da) | 1980-04-07 |
BE875698A (nl) | 1979-08-16 |
JPS5585183A (en) | 1980-06-26 |
CA1112381A (fr) | 1981-11-10 |
GB2032151B (en) | 1983-03-23 |
GB2032151A (en) | 1980-04-30 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
TP | Transmission of property | ||
ST | Notification of lapse |