CH578810A5 - - Google Patents

Info

Publication number
CH578810A5
CH578810A5 CH932073A CH932073A CH578810A5 CH 578810 A5 CH578810 A5 CH 578810A5 CH 932073 A CH932073 A CH 932073A CH 932073 A CH932073 A CH 932073A CH 578810 A5 CH578810 A5 CH 578810A5
Authority
CH
Switzerland
Application number
CH932073A
Original Assignee
Socotel Societe Mixte Pour Le
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 Societe Mixte Pour Le filed Critical Socotel Societe Mixte Pour Le
Publication of CH578810A5 publication Critical patent/CH578810A5/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)
CH932073A 1972-06-27 1973-06-26 CH578810A5 (xx)

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
CH578810A5 true CH578810A5 (xx) 1976-08-13

Family

ID=9101217

Family Applications (1)

Application Number Title Priority Date Filing Date
CH932073A CH578810A5 (xx) 1972-06-27 1973-06-26

Country Status (9)

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

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
US3909549A (en) 1975-09-30
IT985932B (it) 1974-12-30
DE2332696A1 (de) 1974-01-17
SE387033B (sv) 1976-08-23
NL7308966A (xx) 1974-01-02
GB1436623A (en) 1976-05-19
FR2191827A5 (xx) 1974-02-01
BE800626A (fr) 1973-10-01

Similar Documents

Publication Publication Date Title
FR2191827A5 (xx)
FR2188064A1 (xx)
JPS4940054A (xx)
JPS5247422Y2 (xx)
JPS5232389B2 (xx)
JPS4928474A (xx)
JPS5346847Y2 (xx)
JPS5337195Y2 (xx)
JPS5330646Y2 (xx)
JPS4967438U (xx)
JPS4891886A (xx)
JPS4896208U (xx)
CH583203A5 (xx)
CH577642A5 (xx)
LU67865A1 (xx)
SE361139B (xx)
CH571311A5 (xx)
DD100310A1 (xx)
CH588865A5 (xx)
CH587556A5 (xx)
CH587224A5 (xx)
CH585912A5 (xx)
CH585770A5 (xx)
CH585582A5 (xx)
CH570256A5 (xx)

Legal Events

Date Code Title Description
PL Patent ceased
PL Patent ceased