DK145170C - Apparat til detektering af et tonesignal,hvis frekvens liggerinden for et bestemt tonefrekvensbaand - Google Patents

Apparat til detektering af et tonesignal,hvis frekvens liggerinden for et bestemt tonefrekvensbaand

Info

Publication number: DK145170C
Authority: DK; Denmark
Prior art keywords: frequency; tone; detecting; treatment; frequency band
Prior art date: 1975-10-03

Application number

DK444876A

Other languages

English (en)

Other versions

DK444876A (da

DK145170B (da

Inventor

B G Loefmark

Original Assignee

Ericsson Telefon Ab L M

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.)

1975-10-03

Filing date

1976-10-01

Publication date

1983-02-21

1976-10-01 Application filed by Ericsson Telefon Ab L M filed Critical Ericsson Telefon Ab L M

1977-04-04 Publication of DK444876A publication Critical patent/DK444876A/da

1982-09-20 Publication of DK145170B publication Critical patent/DK145170B/da

1983-02-21 Application granted granted Critical

1983-02-21 Publication of DK145170C publication Critical patent/DK145170C/da

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
- H04Q1/46—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies comprising means for distinguishing between a signalling current of predetermined frequency and a complex current containing that frequency, e.g. speech current
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage

Landscapes

Physics & Mathematics (AREA)
General Physics & Mathematics (AREA)
Engineering & Computer Science (AREA)
Computer Networks & Wireless Communication (AREA)
Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Filters And Equalizers (AREA)
Circuits Of Receivers In General (AREA)
Selective Calling Equipment (AREA)
Mobile Radio Communication Systems (AREA)

DK444876A 1975-10-03 1976-10-01 Apparat til detektering af et tonesignal,hvis frekvens liggerinden for et bestemt tonefrekvensbaand DK145170C (da)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
SE7511126A SE388100B (sv)	1975-10-03	1975-10-03	Anordning for detektering av en tonsignal med bestemd frekvens
SE7511126		1975-10-03

Publications (3)

Publication Number	Publication Date
DK444876A DK444876A (da)	1977-04-04
DK145170B DK145170B (da)	1982-09-20
DK145170C true DK145170C (da)	1983-02-21

Family

ID=20325715

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
DK444876A DK145170C (da)	1975-10-03	1976-10-01	Apparat til detektering af et tonesignal,hvis frekvens liggerinden for et bestemt tonefrekvensbaand

Country Status (9)

Country	Link
US (1)	US4092499A (da)
BR (1)	BR7606595A (da)
DE (1)	DE2643646C2 (da)
DK (1)	DK145170C (da)
ES (1)	ES452073A1 (da)
FI (1)	FI762705A7 (da)
IT (1)	IT1072517B (da)
NO (1)	NO139304C (da)
SE (1)	SE388100B (da)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US4169969A (en) *	1974-11-21	1979-10-02	Societe Lignes Telegraphiques Et Telephoniques	Apparatus for detecting in-band signalling signals
JPS605658A (ja) *	1983-06-07	1985-01-12	Hashimoto Corp	秘書電話方式
JP2598913Y2 (ja) *	1992-07-27	1999-08-23	ミツミ電機株式会社	データスライサ
US5408529A (en) *	1993-06-02	1995-04-18	Motorola, Inc.	Dual tone detector operable in the presence of speech or background noise and method therefor

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE1033263B (de) *	1955-12-27	1958-07-03	Siemens Ag	Schaltungsanordnung zum Empfang einer oder mehrerer Signalfrequenzen mit mindestens einer Schwellwertvorrichtung
DE1487973B2 (de) *	1966-05-12	1970-10-08	Standard Elektrik Lorenz Ag, 7000 Stuttgart	Schaltungsanordnung für einen sprachgeschützten Ein- oder Mehrfrequenz-Signalempfänger
DE1537338B2 (de) *	1967-07-21	1974-11-14	Siemens Ag, 1000 Berlin Und 8000 Muenchen	Verfahren zur empfangsseitigen Fehlererkennung bei der Datenübertragung und Schaltungsanordnung zur Durchführung des Verfahrens
FR2141502B1 (da) *	1971-06-01	1973-06-29	Ibm France

1975
- 1975-10-03 SE SE7511126A patent/SE388100B/xx not_active IP Right Cessation
1976
- 1976-09-10 US US05/722,273 patent/US4092499A/en not_active Expired - Lifetime
- 1976-09-22 FI FI762705A patent/FI762705A7/fi not_active Application Discontinuation
- 1976-09-28 DE DE2643646A patent/DE2643646C2/de not_active Expired
- 1976-09-30 IT IT27839/76A patent/IT1072517B/it active
- 1976-10-01 DK DK444876A patent/DK145170C/da not_active IP Right Cessation
- 1976-10-01 NO NO763369A patent/NO139304C/no unknown
- 1976-10-01 BR BR7606595A patent/BR7606595A/pt unknown
- 1976-10-02 ES ES452073A patent/ES452073A1/es not_active Expired

Also Published As

Publication number	Publication date
DK444876A (da)	1977-04-04
NO139304B (no)	1978-10-30
FI762705A7 (da)	1977-04-04
SE388100B (sv)	1976-09-20
NO139304C (no)	1979-02-14
BR7606595A (pt)	1977-07-05
NO763369L (da)	1977-04-05
ES452073A1 (es)	1977-10-01
DE2643646C2 (de)	1986-06-26
DK145170B (da)	1982-09-20
US4092499A (en)	1978-05-30
IT1072517B (it)	1985-04-10
DE2643646A1 (de)	1977-04-14

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Legal Events

Date	Code	Title	Description
1988-07-04	PBP	Patent lapsed