NO770410L - Holdekrets i en mottageranordning for detektering av to tonefrekvenser i et tonesignal. - Google Patents

Holdekrets i en mottageranordning for detektering av to tonefrekvenser i et tonesignal.

Info

Publication number
NO770410L
NO770410L NO770410A NO770410A NO770410L NO 770410 L NO770410 L NO 770410L NO 770410 A NO770410 A NO 770410A NO 770410 A NO770410 A NO 770410A NO 770410 L NO770410 L NO 770410L
Authority
NO
Norway
Prior art keywords
tone
frequences
detecting
holding circuit
receiver device
Prior art date
Application number
NO770410A
Other languages
English (en)
Other versions
NO145122B (no
NO145122C (no
Inventor
Bengt Roland Carlqvist
Anders Gunnar Eriksson
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.)
Filing date
Publication date
Application filed by Ericsson Telefon Ab L M filed Critical Ericsson Telefon Ab L M
Publication of NO770410L publication Critical patent/NO770410L/no
Publication of NO145122B publication Critical patent/NO145122B/no
Publication of NO145122C publication Critical patent/NO145122C/no

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Noise Elimination (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Circuits Of Receivers In General (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
NO770410A 1976-02-09 1977-02-08 Holdekrets i en mottageranordning for detektering av to tonefrekvenser i et tonesignal. NO145122C (no)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7601387A SE396684B (sv) 1976-02-09 1976-02-09 Hallkrets i en mottagaranordning for mfc-signalering

Publications (3)

Publication Number Publication Date
NO770410L true NO770410L (no) 1977-08-10
NO145122B NO145122B (no) 1981-10-05
NO145122C NO145122C (no) 1982-01-13

Family

ID=20326947

Family Applications (1)

Application Number Title Priority Date Filing Date
NO770410A NO145122C (no) 1976-02-09 1977-02-08 Holdekrets i en mottageranordning for detektering av to tonefrekvenser i et tonesignal.

Country Status (21)

Country Link
US (1) US4082924A (no)
AR (1) AR211163A1 (no)
AU (1) AU503870B2 (no)
BR (1) BR7700685A (no)
CA (1) CA1059246A (no)
DE (1) DE2701836A1 (no)
DK (1) DK140918B (no)
EG (1) EG13214A (no)
ES (1) ES455586A1 (no)
FI (1) FI60801C (no)
FR (1) FR2340659A1 (no)
GB (1) GB1518473A (no)
HU (1) HU177201B (no)
IE (1) IE44338B1 (no)
IN (1) IN146386B (no)
IT (1) IT1077617B (no)
NL (1) NL187330C (no)
NO (1) NO145122C (no)
SE (1) SE396684B (no)
SU (1) SU713548A3 (no)
YU (1) YU40160B (no)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE397763B (sv) * 1976-03-09 1977-11-14 Ericsson Telefon Ab L M Mottagaranordning for storningskenslig detektering av atminstone tva tonfrekvenser i en inkommande tonsignal
US4227055A (en) * 1978-12-07 1980-10-07 Bell Telephone Laboratories, Incorporated Multifrequency receiver
DE2938981A1 (de) * 1979-09-26 1981-04-30 Siemens AG, 1000 Berlin und 8000 München Schaltungsanordnung zur registrierung des schaltzustandes in einem insbesondere durch teilnehmeranschlussleitungen von fernsprechvermittlungsanlagen gebildeten schaltkreis
US4398147A (en) * 1981-04-15 1983-08-09 Western Electric Company, Inc. Methods of testing multifrequency dialing signals
GB2132046A (en) * 1982-10-26 1984-06-27 Voice Microsystems Ltd Improvements in or relating to state variable filters
US20080061842A1 (en) * 2006-09-07 2008-03-13 Micron Technology, Inc. Circuit and method for detecting timed amplitude reduction of a signal relative to a threshold voltage
US7560959B2 (en) * 2006-09-18 2009-07-14 Micron Technology, Inc. Absolute value peak differential voltage detector circuit and method

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1342904A (en) * 1970-07-31 1974-01-10 Plessey Telecommunications Res Multifrequency data receivers
NL7101521A (no) * 1971-02-05 1972-08-08
US3934096A (en) * 1973-04-27 1976-01-20 Hitachi, Ltd. Multi-frequency signal receiving circuit
US3875347A (en) * 1973-10-01 1975-04-01 Gte Automatic Electric Lab Inc Multifrequency signal receiver
DE2517024C3 (de) * 1975-04-17 1978-03-02 Standard Elektrik Lorenz Ag, 7000 Stuttgart Schaltungsanordnung für einen Signalempfänger zum Sperren von Signalen, deren Pegel schwankt

Also Published As

Publication number Publication date
SE7601387L (sv) 1977-08-10
IE44338L (en) 1977-08-09
IN146386B (no) 1979-05-19
NO145122B (no) 1981-10-05
SE396684B (sv) 1977-09-26
AR211163A1 (es) 1977-10-31
BR7700685A (pt) 1977-10-11
GB1518473A (en) 1978-07-19
FR2340659B1 (no) 1983-09-09
HU177201B (en) 1981-08-28
DK140918B (da) 1979-12-03
YU40160B (en) 1985-08-31
FI60801C (fi) 1982-03-10
DK140918C (no) 1980-05-19
AU2143777A (en) 1978-07-27
DE2701836A1 (de) 1977-08-11
YU33477A (en) 1982-05-31
FI60801B (fi) 1981-11-30
DK52077A (no) 1977-08-10
IT1077617B (it) 1985-05-04
NL7700323A (nl) 1977-08-11
US4082924A (en) 1978-04-04
FR2340659A1 (fr) 1977-09-02
CA1059246A (en) 1979-07-24
NL187330C (nl) 1991-08-16
EG13214A (en) 1980-07-31
NO145122C (no) 1982-01-13
ES455586A1 (es) 1978-02-01
AU503870B2 (en) 1979-09-27
SU713548A3 (ru) 1980-01-30
FI770020A (no) 1977-08-10
IE44338B1 (en) 1981-10-21

Similar Documents

Publication Publication Date Title
DK196177A (da) Fotoelektrisk signalfrembringgnde kredslob
NL7708496A (nl) Signaalbewerkingsinrichting.
JPS5332604A (en) Circuit for detecting receiving signal
JPS5295935A (en) Amplifier circuit for detecting signal
DD133179A5 (de) Signalverarbeitungsvorrichtung
NL7702680A (nl) Signaalweergeefinrichting.
NL178640C (nl) Digitale signaalbewerkingsinrichting.
NL167822C (nl) Inrichting om in signalen componenten met bepaalde frequenties te detecteren.
SE436239B (sv) Automatisk signalnivareleringskrets for en telefonapparat
SE7703451L (sv) Anordning for detektering av storsignaler
NO770410L (no) Holdekrets i en mottageranordning for detektering av to tonefrekvenser i et tonesignal.
SE415427B (sv) Kopplingsanordning for inforande av en kompensationsspenning i en signalbana
SE7809876L (sv) Signaldetekteringsanordning
BE850718A (fr) Dispositif de transmission de signaux numeriques
BE844453A (fr) Circuit de mesure de signal
JPS52114315A (en) Circuit for detecting input signal effective peak
SE7809877L (sv) Signaldetekteringsanordning
SE397409B (sv) I mottagningsutrustning for signaler ingaende troskelkrets
AT371302B (de) Schaltungsanordnung zum verarbeiten eines periodischen signals
NL7700929A (nl) Elektronische signaalbehandelingsinrichting.
BR7701670A (pt) Aperfeicoamentos em dispositivo processador de sinal em transmissor am
NL7613156A (nl) Electronische signaalschakelinrichting.
NL186547C (nl) Signaaltransmissie-inrichting.
SE388100B (sv) Anordning for detektering av en tonsignal med bestemd frekvens
FR2319132A1 (fr) Circuit de mesure de signal