IT1077617B - Circuito di mantenimento per il rilevamento di due frequenze in un segnale di tono a piu' frequenze nei ricevitori - Google Patents

Circuito di mantenimento per il rilevamento di due frequenze in un segnale di tono a piu' frequenze nei ricevitori

Info

Publication number
IT1077617B
IT1077617B IT20103/77A IT2010377A IT1077617B IT 1077617 B IT1077617 B IT 1077617B IT 20103/77 A IT20103/77 A IT 20103/77A IT 2010377 A IT2010377 A IT 2010377A IT 1077617 B IT1077617 B IT 1077617B
Authority
IT
Italy
Prior art keywords
receivers
frequencies
detection
tone signal
maintenance circuit
Prior art date
Application number
IT20103/77A
Other languages
English (en)
Italian (it)
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
Application granted granted Critical
Publication of IT1077617B publication Critical patent/IT1077617B/it

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)
IT20103/77A 1976-02-09 1977-02-09 Circuito di mantenimento per il rilevamento di due frequenze in un segnale di tono a piu' frequenze nei ricevitori IT1077617B (it)

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 (1)

Publication Number Publication Date
IT1077617B true IT1077617B (it) 1985-05-04

Family

ID=20326947

Family Applications (1)

Application Number Title Priority Date Filing Date
IT20103/77A IT1077617B (it) 1976-02-09 1977-02-09 Circuito di mantenimento per il rilevamento di due frequenze in un segnale di tono a piu' frequenze nei ricevitori

Country Status (21)

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

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 ( ) * 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
CA1059246A (en) 1979-07-24
EG13214A (en) 1980-07-31
NL187330C (nl) 1991-08-16
YU40160B (en) 1985-08-31
NO145122C (no) 1982-01-13
AU503870B2 (en) 1979-09-27
IN146386B ( ) 1979-05-19
YU33477A (en) 1982-05-31
NO770410L (no) 1977-08-10
DK140918C ( ) 1980-05-19
FI60801B (fi) 1981-11-30
SE396684B (sv) 1977-09-26
IE44338B1 (en) 1981-10-21
DK52077A ( ) 1977-08-10
FR2340659B1 ( ) 1983-09-09
FI60801C (fi) 1982-03-10
IE44338L (en) 1977-08-09
NO145122B (no) 1981-10-05
FR2340659A1 (fr) 1977-09-02
US4082924A (en) 1978-04-04
NL7700323A (nl) 1977-08-11
DE2701836A1 (de) 1977-08-11
HU177201B (en) 1981-08-28
ES455586A1 (es) 1978-02-01
SE7601387L (sv) 1977-08-10
AR211163A1 (es) 1977-10-31
BR7700685A (pt) 1977-10-11
FI770020A ( ) 1977-08-10
GB1518473A (en) 1978-07-19
SU713548A3 (ru) 1980-01-30
DK140918B (da) 1979-12-03
AU2143777A (en) 1978-07-27

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Legal Events

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TA Fee payment date (situation as of event date), data collected since 19931001

Effective date: 19940216