DK52077A - - Google Patents

Info

Publication number
DK52077A
DK52077A DK52077A DK52077A DK52077A DK 52077 A DK52077 A DK 52077A DK 52077 A DK52077 A DK 52077A DK 52077 A DK52077 A DK 52077A DK 52077 A DK52077 A DK 52077A
Authority
DK
Denmark
Application number
DK52077A
Other languages
Danish (da)
Other versions
DK140918B (da
DK140918C (ja
Inventor
B R Carlqvist
A G Eriksson
Original Assignee
Ericsson Telefonag 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 Telefonag M filed Critical Ericsson Telefonag M
Publication of DK52077A publication Critical patent/DK52077A/da
Publication of DK140918B publication Critical patent/DK140918B/da
Application granted granted Critical
Publication of DK140918C publication Critical patent/DK140918C/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

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)
DK52077AA 1976-02-09 1977-02-08 Holdekreds i en modtager til detektering af to tonefrekvenser i et tonesignal. DK140918B (da)

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
DK52077A true DK52077A (ja) 1977-08-10
DK140918B DK140918B (da) 1979-12-03
DK140918C DK140918C (ja) 1980-05-19

Family

ID=20326947

Family Applications (1)

Application Number Title Priority Date Filing Date
DK52077AA DK140918B (da) 1976-02-09 1977-02-08 Holdekreds i en modtager til detektering af to tonefrekvenser i et tonesignal.

Country Status (21)

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

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 (ja) * 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
SE396684B (sv) 1977-09-26
DK140918B (da) 1979-12-03
DE2701836A1 (de) 1977-08-11
IE44338B1 (en) 1981-10-21
EG13214A (en) 1980-07-31
IN146386B (ja) 1979-05-19
NL187330C (nl) 1991-08-16
AR211163A1 (es) 1977-10-31
BR7700685A (pt) 1977-10-11
US4082924A (en) 1978-04-04
YU33477A (en) 1982-05-31
FR2340659B1 (ja) 1983-09-09
ES455586A1 (es) 1978-02-01
NL7700323A (nl) 1977-08-11
NO145122B (no) 1981-10-05
AU503870B2 (en) 1979-09-27
IE44338L (en) 1977-08-09
CA1059246A (en) 1979-07-24
NO145122C (no) 1982-01-13
FR2340659A1 (fr) 1977-09-02
SE7601387L (sv) 1977-08-10
SU713548A3 (ru) 1980-01-30
HU177201B (en) 1981-08-28
NO770410L (no) 1977-08-10
FI770020A (ja) 1977-08-10
DK140918C (ja) 1980-05-19
AU2143777A (en) 1978-07-27
YU40160B (en) 1985-08-31
GB1518473A (en) 1978-07-19
FI60801B (fi) 1981-11-30
FI60801C (fi) 1982-03-10
IT1077617B (it) 1985-05-04

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Legal Events

Date Code Title Description
PUP Patent expired