ES477991A1 - Compensating circuit for telecommunication system - eliminates harmonics from stepped sine-wave using current mirror circuit - Google Patents

Compensating circuit for telecommunication system - eliminates harmonics from stepped sine-wave using current mirror circuit

Info

Publication number
ES477991A1
ES477991A1 ES477991A ES477991A ES477991A1 ES 477991 A1 ES477991 A1 ES 477991A1 ES 477991 A ES477991 A ES 477991A ES 477991 A ES477991 A ES 477991A ES 477991 A1 ES477991 A1 ES 477991A1
Authority
ES
Spain
Prior art keywords
current mirror
circuit
wave
telecommunication system
mirror circuit
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
ES477991A
Other languages
Spanish (es)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Licentia Patent Verwaltungs GmbH
Original Assignee
Licentia Patent Verwaltungs GmbH
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 Licentia Patent Verwaltungs GmbH filed Critical Licentia Patent Verwaltungs GmbH
Publication of ES477991A1 publication Critical patent/ES477991A1/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/26—Devices for calling a subscriber
    • H04M1/30—Devices which can set up and transmit only one digit at a time
    • H04M1/50—Devices which can set up and transmit only one digit at a time by generating or selecting currents of predetermined frequencies or combinations of frequencies
    • H04M1/505—Devices which can set up and transmit only one digit at a time by generating or selecting currents of predetermined frequencies or combinations of frequencies signals generated in digital form

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Transmitters (AREA)
  • Networks Using Active Elements (AREA)
  • Power Conversion In General (AREA)

Abstract

The compensating circuit eliminates harmonics in telecommunications systems and has a device (23) producing a stepped sinewave from a dc supply. The stepped sinewave is passed to a current mirror circuit (7, 8). The reflected current is passed to an active LP filter (21). the filter is designed so that its output compensates the harmonic component of the reflected stepped sinewave from the current mirror.
ES477991A 1978-02-25 1979-02-23 Compensating circuit for telecommunication system - eliminates harmonics from stepped sine-wave using current mirror circuit Expired ES477991A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2808256A DE2808256C2 (en) 1978-02-25 1978-02-25 Circuit arrangement for compensating harmonics

Publications (1)

Publication Number Publication Date
ES477991A1 true ES477991A1 (en) 1979-07-01

Family

ID=6032996

Family Applications (1)

Application Number Title Priority Date Filing Date
ES477991A Expired ES477991A1 (en) 1978-02-25 1979-02-23 Compensating circuit for telecommunication system - eliminates harmonics from stepped sine-wave using current mirror circuit

Country Status (6)

Country Link
AT (1) ATA144379A (en)
BE (1) BE874360A (en)
DE (1) DE2808256C2 (en)
ES (1) ES477991A1 (en)
FR (1) FR2418586A1 (en)
IT (1) IT1111800B (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2023617A1 (en) * 1970-05-14 1971-12-02 Bosch Gmbh Robert Electric filter
US4061886A (en) * 1975-09-29 1977-12-06 Mostek Corporation Dual tone multiple frequency generator

Also Published As

Publication number Publication date
DE2808256C2 (en) 1984-05-30
ATA144379A (en) 1983-02-15
BE874360A (en) 1979-06-18
IT7920494A0 (en) 1979-02-23
FR2418586A1 (en) 1979-09-21
IT1111800B (en) 1986-01-13
DE2808256A1 (en) 1979-09-06

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Legal Events

Date Code Title Description
FD1A Patent lapsed

Effective date: 19841024