GB549926A - Attenuation equalizer - Google Patents

Attenuation equalizer

Info

Publication number
GB549926A
GB549926A GB4180/42A GB418042A GB549926A GB 549926 A GB549926 A GB 549926A GB 4180/42 A GB4180/42 A GB 4180/42A GB 418042 A GB418042 A GB 418042A GB 549926 A GB549926 A GB 549926A
Authority
GB
United Kingdom
Prior art keywords
sections
loss
section
range
bridged
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
GB4180/42A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB549926A publication Critical patent/GB549926A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03HIMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01Frequency selective two-port networks
    • H03H7/17Structural details of sub-circuits of frequency selective networks
    • H03H7/1741Comprising typical LC combinations, irrespective of presence and location of additional resistors
    • H03H7/1783Combined LC in series path
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03HIMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01Frequency selective two-port networks
    • H03H7/075Ladder networks, e.g. electric wave filters
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03HIMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01Frequency selective two-port networks
    • H03H7/17Structural details of sub-circuits of frequency selective networks
    • H03H7/1708Comprising bridging elements, i.e. elements in a series path without own reference to ground and spanning branching nodes of another series path
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03HIMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01Frequency selective two-port networks
    • H03H7/17Structural details of sub-circuits of frequency selective networks
    • H03H7/1741Comprising typical LC combinations, irrespective of presence and location of additional resistors
    • H03H7/1791Combined LC in shunt or branch path
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B3/00Line transmission systems
    • H04B3/02Details
    • H04B3/04Control of transmission; Equalising
    • H04B3/14Control of transmission; Equalising characterised by the equalising network used
    • H04B3/143Control of transmission; Equalising characterised by the equalising network used using amplitude-frequency equalisers
    • H04B3/145Control of transmission; Equalising characterised by the equalising network used using amplitude-frequency equalisers variable equalisers

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Networks Using Active Elements (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
  • Measurement Of Resistance Or Impedance (AREA)
  • Adjustable Resistors (AREA)

Abstract

549,926. Impedance networks. STANDARD TELEPHONES & CABLES, Ltd. March 28, 1942, No. 4180. Convention date, Oct. 24, 1940. [Class 40 (iii)] A variable attenuator comprises a number of sections connected in parallel at their input ends and coupled at their output ends to a high impedance load by a condenser potentiometer. The sections are preferably of constant resistance type and their loss characteristics are linear over the working frequency range, the loss being the same for all the sections at some frequency at the lower end of the range, as indicated in Fig. 5. Sections 2, 3 may be of the bridged-T type shown in Fig. 2 having a rising characteristic and sections 5, 6 may be of the bridged-T type shown in Fig. 3 having a falling characteristic, while section 4 is a simple resistance pad giving uniform loss. A further section 1 similar to section 2 may be connected in tandem therewith, the combination having a characteristic curve 11 slightly displaced from the common point 39 of the curves of the other sections. Sections 1, 3, 5, 6 are terminated in their image impedances and resistances 8, 9, 10 may be added to adjust the loss at certain frequencies. Section 7, which gives a gain over a part of the working range may be designed as shown in Fig. 4, in which the series and shunt impedances are connected by the relation Zc(Za+Zb-Ro)=Ro<2>. The condenser potentiometer comprises fixed plates 31-37 connected to the various sections and a plate 30 which may be moved manually or automatically, for example, under the control of a pilot current, to bring it opposite any one or an adjacent pair of the fixed plates.
GB4180/42A 1940-10-24 1942-03-28 Attenuation equalizer Expired GB549926A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US362545A US2265042A (en) 1940-10-24 1940-10-24 Attenuation equalizer

Publications (1)

Publication Number Publication Date
GB549926A true GB549926A (en) 1942-12-14

Family

ID=23426524

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4180/42A Expired GB549926A (en) 1940-10-24 1942-03-28 Attenuation equalizer

Country Status (2)

Country Link
US (1) US2265042A (en)
GB (1) GB549926A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2608605A (en) * 1943-05-31 1952-08-26 Hartford Nat Bank & Trust Co Device for undertaking loss-angle measurements
US2646468A (en) * 1950-02-01 1953-07-21 Hammond Instr Co Ear response compensated volume control apparatus
US2738465A (en) * 1951-05-05 1956-03-13 Bell Telephone Labor Inc Equalizer
GB920491A (en) * 1958-05-29 1963-03-06 Submarine Cables Ltd Attenuation equaliser for submarine cables

Also Published As

Publication number Publication date
US2265042A (en) 1941-12-02

Similar Documents

Publication Publication Date Title
US2122748A (en) Four-pole device containing nonlinear resistors
GB554092A (en) Electric wave transmission network
US2003428A (en) Volume control for transmission circuits
GB549926A (en) Attenuation equalizer
US3204048A (en) Negative impedance repeaters for non-loaded lines
GB514567A (en) Improvements in or relating to thermionic amplifiers
US1975709A (en) Electrical transmission device
US2252002A (en) Telephone and other electric wave transmission systems
GB482103A (en) Improvements in variable attenuators of electric signals
US2070668A (en) Wave transmission network
US2065344A (en) Control means for signal control transmission systems
GB476799A (en) Improvements in or relating to electric signal transmission systems
DE807098C (en) Amplifier circuit with adjustable amplification and frequency-dependent negative feedback
GB554329A (en) Impedance hatching networks for use in electrical transmission systems
GB397551A (en) Improvements in electrical impedance networks and amplifiers
US2218400A (en) Equalizer
US2500424A (en) Negative feedback amplifier
GB517516A (en) Improvements in or relating to electric wave transmission networks
GB770878A (en) Improvements in or relating to electrical delay networks
GB469214A (en) Improvements in wave transmission systems and variable equalizers therefor
US2252679A (en) Preventing singing in telephone repeaters
AT151111B (en) Call facility.
GB613709A (en) Improvements in variable equalisers for signal transmission systems
GB605947A (en) Wide band vacuum-tube amplifiers
GB777670A (en) Electric equalising networks