BE788813A - Recepteur de signaux selectif en frequence et protege contre les signaux vocaux pour des installations de telecommunications, notamment des installations de telephonie - Google Patents

Recepteur de signaux selectif en frequence et protege contre les signaux vocaux pour des installations de telecommunications, notamment des installations de telephonie

Info

Publication number: BE788813A
Authority: BE; Belgium
Prior art keywords: installations; signal receiver; protected against; voice signals; frequency selective
Prior art date: 1971-09-14

Application number

Other languages

English (en)

French (fr)

Original Assignee

Siemens Ag

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.)

1971-09-14

Publication date

1973-03-14

1971-09-14 Priority claimed from DE19712145886 external-priority patent/DE2145886C2/de

1971-11-11 Priority claimed from DE19712156123 external-priority patent/DE2156123C2/de

1973-03-14 Publication of BE788813A publication Critical patent/BE788813A/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)
Monitoring And Testing Of Exchanges (AREA)
Interface Circuits In Exchanges (AREA)
Mobile Radio Communication Systems (AREA)

BE788813D 1971-09-14 Recepteur de signaux selectif en frequence et protege contre les signaux vocaux pour des installations de telecommunications, notamment des installations de telephonie BE788813A (fr)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
DE19712145886 DE2145886C2 (de)	1971-09-14	1971-09-14	Sprachgeschützter frequenzselektiver Zeichenempfänger für Fernmelde-, insbesondere Fernsprechanlagen
DE19712156123 DE2156123C2 (de)	1971-11-11	1971-11-11	Frequenzselektiver Zeichenempfänger für Fernmelde-, insbesondere Fernsprechanlagen

Publications (1)

Publication Number	Publication Date
BE788813A true BE788813A (fr)	1973-03-14

Family

ID=25761724

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
BE788813D BE788813A (fr)	1971-09-14		Recepteur de signaux selectif en frequence et protege contre les signaux vocaux pour des installations de telecommunications, notamment des installations de telephonie

Country Status (9)

Country	Link
AT (1)	AT328516B (de)
BE (1)	BE788813A (de)
CH (1)	CH545569A (de)
FR (1)	FR2153943A5 (de)
GB (1)	GB1402119A (de)
IT (1)	IT967367B (de)
LU (1)	LU66057A1 (de)
NL (1)	NL7212486A (de)
SE (1)	SE397461B (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US4216463A (en) *	1978-08-10	1980-08-05	Motorola, Inc.	Programmable digital tone detector

0
- BE BE788813D patent/BE788813A/xx unknown
1972
- 1972-08-17 AT AT713372A patent/AT328516B/de not_active IP Right Cessation
- 1972-08-21 CH CH545569D patent/CH545569A/xx not_active IP Right Cessation
- 1972-09-11 FR FR7232114A patent/FR2153943A5/fr not_active Expired
- 1972-09-12 IT IT2907772A patent/IT967367B/it active
- 1972-09-12 LU LU66057D patent/LU66057A1/xx unknown
- 1972-09-13 SE SE1182472A patent/SE397461B/xx unknown
- 1972-09-13 GB GB4245972A patent/GB1402119A/en not_active Expired
- 1972-09-14 NL NL7212486A patent/NL7212486A/xx not_active Application Discontinuation

Also Published As

Publication number	Publication date
NL7212486A (de)	1973-03-16
IT967367B (it)	1974-02-28
ATA713372A (de)	1975-06-15
AT328516B (de)	1976-03-25
CH545569A (de)	1974-01-31
GB1402119A (en)	1975-08-06
FR2153943A5 (de)	1973-05-04
SE397461B (sv)	1977-10-31
LU66057A1 (de)	1973-01-17

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