SE387033B - Flerfrekvenssignaleringsmottagare innefattande ett flertal selektiva filter, av vilka vart och ett har reglerbar selektivitet - Google Patents

Flerfrekvenssignaleringsmottagare innefattande ett flertal selektiva filter, av vilka vart och ett har reglerbar selektivitet

Info

Publication number
SE387033B
SE387033B SE7308900A SE7308900A SE387033B SE 387033 B SE387033 B SE 387033B SE 7308900 A SE7308900 A SE 7308900A SE 7308900 A SE7308900 A SE 7308900A SE 387033 B SE387033 B SE 387033B
Authority
SE
Sweden
Prior art keywords
multiprequency
including several
signal receivers
selective filters
receivers including
Prior art date
Application number
SE7308900A
Other languages
English (en)
Swedish (sv)
Inventor
A Tarridec
J L M Joubert
Original Assignee
Socotel
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 Socotel filed Critical Socotel
Publication of SE387033B publication Critical patent/SE387033B/xx

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H11/00—Networks using active elements
    • H03H11/02—Multiple-port networks
    • H03H11/04—Frequency selective two-port networks
    • H03H11/12—Frequency selective two-port networks using amplifiers with feedback
    • H03H11/1295—Parallel-T filters
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H11/00—Networks using active elements
    • H03H11/02—Multiple-port networks
    • H03H11/04—Frequency selective two-port networks
    • H03H11/12—Frequency selective two-port networks using amplifiers with feedback
    • H03H11/1217—Frequency selective two-port networks using amplifiers with feedback using a plurality of operational amplifiers
    • 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)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Amplifiers (AREA)
SE7308900A 1972-06-27 1973-06-25 Flerfrekvenssignaleringsmottagare innefattande ett flertal selektiva filter, av vilka vart och ett har reglerbar selektivitet SE387033B (sv)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7223909A FR2191827A5 (it) 1972-06-27 1972-06-27

Publications (1)

Publication Number Publication Date
SE387033B true SE387033B (sv) 1976-08-23

Family

ID=9101217

Family Applications (1)

Application Number Title Priority Date Filing Date
SE7308900A SE387033B (sv) 1972-06-27 1973-06-25 Flerfrekvenssignaleringsmottagare innefattande ett flertal selektiva filter, av vilka vart och ett har reglerbar selektivitet

Country Status (9)

Country Link
US (1) US3909549A (it)
BE (1) BE800626A (it)
CH (1) CH578810A5 (it)
DE (1) DE2332696A1 (it)
FR (1) FR2191827A5 (it)
GB (1) GB1436623A (it)
IT (1) IT985932B (it)
NL (1) NL7308966A (it)
SE (1) SE387033B (it)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2280141A1 (fr) * 1974-07-26 1976-02-20 Materiel Telephonique Systeme de signalisation entre centres de traitement d'informations
US4313038A (en) * 1978-10-13 1982-01-26 Wescom, Inc. DTMF Signal receiver
NL7903346A (nl) * 1979-04-27 1980-10-29 Bell Telephone Mfg Digitaal signaleringsstelsel.
US4604755A (en) * 1984-06-01 1986-08-05 International Business Machines Corp. Feed forward dual channel automatic level control for dual tone multi-frequency receivers
US5107491A (en) * 1990-02-20 1992-04-21 Advanced Micro Devices, Inc. Collision filter

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3780230A (en) * 1972-11-10 1973-12-18 Bell Telephone Labor Inc Multifrequency tone receiver

Also Published As

Publication number Publication date
GB1436623A (en) 1976-05-19
US3909549A (en) 1975-09-30
FR2191827A5 (it) 1974-02-01
IT985932B (it) 1974-12-30
DE2332696A1 (de) 1974-01-17
CH578810A5 (it) 1976-08-13
NL7308966A (it) 1974-01-02
BE800626A (fr) 1973-10-01

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