BE818726R - Selectieve tekenontvanger voor communicatiestelsels - Google Patents

Selectieve tekenontvanger voor communicatiestelsels

Info

Publication number: BE818726R
Authority: BE; Belgium
Prior art keywords: communication schemes; sign receiver; selective sign; selective; receiver
Prior art date: 1973-08-16

Application number

BE2053803A

Other languages

Priority date (The priority date 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 date listed.)

1973-08-16

Filing date

1974-08-12

Publication date

1975-02-12

1974-08-12 Application filed filed Critical

1975-02-12 Application granted granted Critical

1975-02-12 Publication of BE818726R publication Critical patent/BE818726R/xx

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)
Measuring Frequencies, Analyzing Spectra (AREA)
Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Monitoring And Testing Of Exchanges (AREA)

BE2053803A 1973-08-16 1974-08-12 Selectieve tekenontvanger voor communicatiestelsels BE818726R (nl)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
DE2341224A DE2341224C3 (de)	1973-08-16	1973-08-16	Verfahren zur Frequenzerkennung in selektiven Zeichenempfängern für Fernmelde-, insbesondere Fernsprechanlagen

Publications (1)

Publication Number	Publication Date
BE818726R true BE818726R (nl)	1975-02-12

Family

ID=5889792

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
BE2053803A BE818726R (nl)	1973-08-16	1974-08-12	Selectieve tekenontvanger voor communicatiestelsels

Country Status (7)

Country	Link
US (1)	US3949177A (xx)
BE (1)	BE818726R (xx)
DE (1)	DE2341224C3 (xx)
FR (1)	FR2241174B3 (xx)
GB (1)	GB1460995A (xx)
HK (1)	HK44077A (xx)
ZA (1)	ZA744859B (xx)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US4027102A (en) *	1974-11-29	1977-05-31	Pioneer Electronic Corporation	Voice versus pulsed tone signal discrimination circuit
DE2540859C2 (de) *	1975-09-13	1984-01-12	Standard Elektrik Lorenz Ag, 7000 Stuttgart	Schaltungsanordnung für einen selektiven Zeichenempfänger, insbesondere für Fernsprechanlagen
DE2546850C2 (de) *	1975-10-18	1985-02-07	Standard Elektrik Lorenz Ag, 7000 Stuttgart	Verfahren und Schaltungsanordnung zur Verminderung der Störanfälligkeit von selektiven Zeichenempfängern für Fernmelde-, insbesondere Fernsprechanlagen
US4044206A (en) *	1975-11-25	1977-08-23	Melco	Digital decoder for multiple frequency telephone signalling
US4021620A (en) *	1975-12-04	1977-05-03	Rca Corporation	Multifrequency signal receiver with digital tone receiver
US4061885A (en) *	1975-12-17	1977-12-06	Motorola, Inc.	Digital tone decoder
US4016371A (en) *	1976-01-26	1977-04-05	Rockwell International Corporation	Frequency tone detection
JPS5366309A (en) *	1976-11-26	1978-06-13	Nec Corp	Digital type tone signal detector
DE2719248C2 (de) *	1977-04-29	1983-04-07	Siemens AG, 1000 Berlin und 8000 München	Frequenzselektiver Zeichenempfänger für Fernmelde-, insbesondere Fernsprechanlagen
JPS5537027A (en) *	1978-09-08	1980-03-14	Hitachi Ltd	Frequency discriminating circuit
US4419765A (en) *	1979-10-12	1983-12-06	Keith H. Wycoff	Signal absence detector
DE3115151A1 (de) *	1981-04-15	1982-11-11	Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt	Schaltungsanordnung zur auswertung von aus mehreren gleichzeitig uebertragenen wechselstroemen unterschiedlicher signalfrequenzen gebildeten wechselstromsignalen, in fernmeldeanlagen
US4453550A (en) *	1982-04-19	1984-06-12	General Electric Company	Method and means for detecting a periodic wave structure
GB2185170B (en) *	1983-11-10	1988-06-02	Stc Plc	Testing telephone lines
US4675898A (en) *	1984-12-07	1987-06-23	Buscom Systems, Inc.	Single tone telephone receiver
US4740744A (en) *	1985-09-18	1988-04-26	Lp Com	Digital signal processing apparatus for analog signals having wide frequency and dynamic ranges
US4914600A (en) *	1987-06-05	1990-04-03	Gruman Aerospace Corporation	Programmable frequency identifier circuit

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE1282734B (de) *	1965-09-29	1968-11-14	Siemens Ag	Verfahren zur Bestimmung der Frequenz einer Schwingung aus einer Anzahl von Schwingungen, insbesondere in Fernsprechanlagen mit Tonfrequenzwahl
US3537001A (en) *	1968-12-05	1970-10-27	Bell Telephone Labor Inc	Multifrequency tone detector
US3790720A (en) *	1972-10-27	1974-02-05	Northern Electric Co	Digital decoder for multiple frequency telephone signalling

1973
- 1973-08-16 DE DE2341224A patent/DE2341224C3/de not_active Expired
1974
- 1974-07-30 ZA ZA00744859A patent/ZA744859B/xx unknown
- 1974-08-06 GB GB3455574A patent/GB1460995A/en not_active Expired
- 1974-08-12 BE BE2053803A patent/BE818726R/xx active
- 1974-08-14 FR FR7428204A patent/FR2241174B3/fr not_active Expired
- 1974-08-15 US US05/497,707 patent/US3949177A/en not_active Expired - Lifetime
1977
- 1977-09-01 HK HK440/77A patent/HK44077A/xx unknown

Also Published As

Publication number	Publication date
FR2241174A1 (xx)	1975-03-14
AU7238974A (en)	1976-02-19
FR2241174B3 (xx)	1977-06-10
DE2341224B2 (de)	1976-10-28
DE2341224C3 (de)	1982-01-07
ZA744859B (en)	1975-08-27
HK44077A (en)	1977-09-09
DE2341224A1 (de)	1975-02-20
US3949177A (en)	1976-04-06
GB1460995A (en)	1977-01-06

Publication	Publication Date	Title
AT337077B (de)	1977-06-10	Aufnahmebehalter
NL177546C (nl)	1985-10-01	Radiocommunicatiestelsel.
BE796830A (nl)	1973-09-17	Communicatie-ontvanger
SE391625B (sv)	1977-02-21	Hogtalarsystem
NL169943C (nl)	1982-09-01	Communicatiestelsel.
BE818726R (nl)	1975-02-12	Selectieve tekenontvanger voor communicatiestelsels
AT337787B (de)	1977-07-25	Fernmelde-vermittlungsanlage
DK347774A (da)	1977-10-17	Radiotransmissionssystem
GB1439399A (en)	1976-06-16	Radio repeater system
BE818725A (nl)	1975-02-12	Selectieve tekenontvanger voor communicatiestelsels
NL7609516A (nl)	1977-03-02	Communicatiestelsel.
IT1017534B (it)	1977-08-10	Radioricevitore
NL7415708A (nl)	1975-06-03	Ontvanger.
NL162289B (nl)	1979-11-15	Radio-ontvanger.
NL7409535A (nl)	1975-01-27	Schuimstofvorming.
AT340479B (de)	1977-12-12	Empfangsumsetzer
NL7413498A (nl)	1975-04-15	Radio-ontvanger.
AT336694B (de)	1977-05-25	Nebenstellen-fernsprechanlage
NL7416782A (nl)	1975-07-01	Stereo-ontvanger.
IT1007181B (it)	1976-10-30	Ricevitore pilota
NL177547C (nl)	1985-10-01	Telefoonstelsel.
SE7409155L (sv)	1975-01-15	Radarmottagare for skiftande frekvens.
IT1017105B (it)	1977-07-20	Ricevitore di radio navigazione
NL175472C (nl)	1984-11-01	Leerstelsel.
NL176419C (nl)	1985-04-01	Tijdmultiplexcommunicatiestelsel.