IE36569L - Gain control circuits - Google Patents

Gain control circuits

Info

Publication number
IE36569L
IE36569L IE721000A IE100072A IE36569L IE 36569 L IE36569 L IE 36569L IE 721000 A IE721000 A IE 721000A IE 100072 A IE100072 A IE 100072A IE 36569 L IE36569 L IE 36569L
Authority
IE
Ireland
Prior art keywords
transistors
control
frequency dependent
resistor
capacitor
Prior art date
Application number
IE721000A
Other versions
IE36569B1 (en
Original Assignee
Standard Telephones Cables Ltd
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 Standard Telephones Cables Ltd filed Critical Standard Telephones Cables Ltd
Publication of IE36569L publication Critical patent/IE36569L/en
Publication of IE36569B1 publication Critical patent/IE36569B1/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0264—Arrangements for coupling to transmission lines
    • H04L25/0278—Arrangements for impedance matching
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G5/00—Tone control or bandwidth control in amplifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/04—Control of transmission; Equalising
    • H04B3/14—Control of transmission; Equalising characterised by the equalising network used
    • H04B3/141—Control of transmission; Equalising characterised by the equalising network used using multiequalisers, e.g. bump, cosine, Bode
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03878—Line equalisers; line build-out devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/10—Compensating for variations in line balance

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Networks Using Active Elements (AREA)
  • Filters And Equalizers (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Amplifiers (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

1308877 Automatic equalizers STANDARD TELEPHONES & CABLES Ltd 23 Sept 1971 44392/71 Heading H4R In a variable equalizer, e.g. for compensating ambient temperature dependent changes in frequency response in a line transmission system, the input signal is fed to two parallel connected circuits each comprising a frequency dependent impedance and a transistor. The output signal is derived from an electrode of one of the transistors and a control signal is arranged to control the ratio of the resistances presented by the two transistors, to vary the current distribution between them and thus change the frequency response of the circuit. As shown the input signal I is applied to a transistor T3 whose collector is connected to the parallel circuits formed by transistors T1 and T2 and frequency dependent impedances Z1 and Z2. The output is taken from the collector of T2 and the impedances of the transistors T1 and T2 are differentially varied by varying the control voltages CV1 and CV2 applied to their bases. The control voltages can be derived by peak detection of the output signal 0 of the circuit. The frequency dependent networks can be formed by three parallel connected arms containing respectively a resistor, a resistor and a capacitor in series, and a capacitor. [GB1308877A]
IE1000/72A 1971-09-23 1972-07-14 Improvements in electric circuit arrangements IE36569B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4439271 1971-09-23

Publications (2)

Publication Number Publication Date
IE36569L true IE36569L (en) 1973-03-23
IE36569B1 IE36569B1 (en) 1976-12-08

Family

ID=10433076

Family Applications (1)

Application Number Title Priority Date Filing Date
IE1000/72A IE36569B1 (en) 1971-09-23 1972-07-14 Improvements in electric circuit arrangements

Country Status (9)

Country Link
AU (1) AU464019B2 (en)
BE (1) BE789113A (en)
CH (1) CH551108A (en)
DE (1) DE2245676A1 (en)
ES (1) ES406937A1 (en)
FR (1) FR2154164A5 (en)
GB (1) GB1308877A (en)
IE (1) IE36569B1 (en)
ZA (1) ZA724857B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2262089C3 (en) * 1972-12-19 1975-10-30 Philips Patentverwaltung Gmbh, 2000 Hamburg Circuit arrangement for electronic frequency influencing, in particular electronic sound adjuster
JPS52104840A (en) * 1976-03-01 1977-09-02 Hitachi Ltd Variable equalizer

Also Published As

Publication number Publication date
DE2245676A1 (en) 1973-03-29
GB1308877A (en) 1973-03-07
AU4603972A (en) 1974-03-07
CH551108A (en) 1974-06-28
ZA724857B (en) 1973-04-25
FR2154164A5 (en) 1973-05-04
IE36569B1 (en) 1976-12-08
ES406937A1 (en) 1975-09-01
BE789113A (en) 1973-03-22
AU464019B2 (en) 1975-08-14

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