IT7821472A0 - Ricevitore di segnali selettivo in frequenza, protetto da un funzionamento accidentale causato dalla voce. - Google Patents

Ricevitore di segnali selettivo in frequenza, protetto da un funzionamento accidentale causato dalla voce.

Info

Publication number: IT7821472A0
Authority: IT; Italy
Prior art keywords: voice; protected; signal receiver; frequency selective; operation caused
Prior art date: 1977-03-23

Application number

IT7821472A

Other languages

English (en)

Other versions

IT1093692B (it

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.)

1977-03-23

Filing date

1978-03-22

Publication date

1978-03-22

1978-03-22 Application filed by Siemens Ag filed Critical Siemens Ag

1978-03-22 Publication of IT7821472A0 publication Critical patent/IT7821472A0/it

1985-07-26 Application granted granted Critical

1985-07-26 Publication of IT1093692B publication Critical patent/IT1093692B/it

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)
Radar Systems Or Details Thereof (AREA)
Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Circuits Of Receivers In General (AREA)
Monitoring And Testing Of Transmission In General (AREA)
Dc Digital Transmission (AREA)

IT21472/78A 1977-03-23 1978-03-22 Ricevitore di segnali selettivo in frequenza,protetto da un funzionamento accidentale causato dalla voce IT1093692B (it)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
DE2712847A DE2712847C3 (de)	1977-03-23	1977-03-23	Sprachgeschützter frequenzselektiver Zeichenempfänger

Publications (2)

Publication Number	Publication Date
IT7821472A0 true IT7821472A0 (it)	1978-03-22
IT1093692B IT1093692B (it)	1985-07-26

Family

ID=6004480

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
IT21472/78A IT1093692B (it)	1977-03-23	1978-03-22	Ricevitore di segnali selettivo in frequenza,protetto da un funzionamento accidentale causato dalla voce

Country Status (9)

Country	Link
US (1)	US4187403A (it)
JP (1)	JPS53117902A (it)
AT (1)	AT370579B (it)
DE (1)	DE2712847C3 (it)
FR (1)	FR2385284A1 (it)
GB (1)	GB1599111A (it)
IT (1)	IT1093692B (it)
NL (1)	NL7802771A (it)
SE (1)	SE7803252L (it)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE2921899C2 (de) *	1979-05-30	1987-01-22	Nord-Micro Elektronik Feinmechanik AG, 6000 Frankfurt	Verfahren zur Frequenzmessung
DD259987A3 (de) *	1986-07-07	1988-09-14	Rft Nachrichtenelektronik Albe	Verfahren und anordnung zum sprachschutz in mfc-tastwahlempfaengern
DD266253A3 (de) *	1987-06-22	1989-03-29	Leipzig Rft Nachrichtenelekt	Universeller digitaler mfc-empfaenger

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US3537001A (en) *	1968-12-05	1970-10-27	Bell Telephone Labor Inc	Multifrequency tone detector
BR7101977D0 (pt) *	1971-04-05	1973-06-14	Ibm	Processos e disposicoes de circuito para decodificacao digital de sinais de frequencia codificada
DE2422840A1 (de) *	1974-05-10	1975-12-11	Standard Elektrik Lorenz Ag	Frequenzselektiver signalempfaenger

1977
- 1977-03-23 DE DE2712847A patent/DE2712847C3/de not_active Expired
1978
- 1978-03-13 FR FR7807118A patent/FR2385284A1/fr active Granted
- 1978-03-14 NL NL7802771A patent/NL7802771A/xx not_active Application Discontinuation
- 1978-03-15 US US05/886,957 patent/US4187403A/en not_active Expired - Lifetime
- 1978-03-20 AT AT0195178A patent/AT370579B/de not_active IP Right Cessation
- 1978-03-21 SE SE7803252A patent/SE7803252L/xx unknown
- 1978-03-22 IT IT21472/78A patent/IT1093692B/it active
- 1978-03-22 GB GB11288/78A patent/GB1599111A/en not_active Expired
- 1978-03-23 JP JP3356678A patent/JPS53117902A/ja active Pending

Also Published As

Publication number	Publication date
IT1093692B (it)	1985-07-26
DE2712847A1 (de)	1978-10-05
FR2385284B1 (it)	1982-03-26
DE2712847B2 (de)	1979-04-12
ATA195178A (de)	1982-08-15
SE7803252L (sv)	1978-09-24
JPS53117902A (en)	1978-10-14
US4187403A (en)	1980-02-05
NL7802771A (nl)	1978-09-26
GB1599111A (en)	1981-09-30
FR2385284A1 (fr)	1978-10-20
AT370579B (de)	1983-04-11
DE2712847C3 (de)	1979-12-06

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