GB556231A - Attenuation equalizer - Google Patents

Attenuation equalizer

Info

Publication number
GB556231A
GB556231A GB12841/42A GB1284142A GB556231A GB 556231 A GB556231 A GB 556231A GB 12841/42 A GB12841/42 A GB 12841/42A GB 1284142 A GB1284142 A GB 1284142A GB 556231 A GB556231 A GB 556231A
Authority
GB
United Kingdom
Prior art keywords
crystal
equalizer
sept
resistance
impedance
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
GB12841/42A
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 GB556231A publication Critical patent/GB556231A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/46—Filters
    • H03H9/54—Filters comprising resonators of piezoelectric or electrostrictive material
    • H03H9/542—Filters comprising resonators of piezoelectric or electrostrictive material including passive elements

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Filters And Equalizers (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)

Abstract

556,231. Automatic volume control. STANDARD TELEPHONES & CABLES, Ltd. Sept. 11, 1942, No. 12841. Convention date, Sept. 27, 1941. [Class 40 (iv)] [Also in Group XL] An attenuation equalizer suitable for correcting the distortion in a pilot channel in a multichannel telephone system arising from passage through a narrow band-filter comprises a series arm containing a piezo-electric crystal X and a resistance R in parallel, the crystal having a resonance at or near the middle of the frequency band. If a second series arm is used the impedance of each is halved. In order to allow for manufacturing variations of the crystal and to permit adjustment of the characteristics of the equalizer, a variable resistance R<SP>1</SP> may be connected in series with the crystal. A shunt resistance may be added to either or both ends of the equalizer for impedance-matching.
GB12841/42A 1941-09-27 1942-09-11 Attenuation equalizer Expired GB556231A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US412587A US2337399A (en) 1941-09-27 1941-09-27 Attenuation equalizer

Publications (1)

Publication Number Publication Date
GB556231A true GB556231A (en) 1943-09-24

Family

ID=23633592

Family Applications (1)

Application Number Title Priority Date Filing Date
GB12841/42A Expired GB556231A (en) 1941-09-27 1942-09-11 Attenuation equalizer

Country Status (2)

Country Link
US (1) US2337399A (en)
GB (1) GB556231A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2738465A (en) * 1951-05-05 1956-03-13 Bell Telephone Labor Inc Equalizer

Also Published As

Publication number Publication date
US2337399A (en) 1943-12-21

Similar Documents

Publication Publication Date Title
GB1533266A (en) Equalization circuits
GB1522100A (en) Bidirectional filter circuit
GB1490970A (en) Equalizers
GB556231A (en) Attenuation equalizer
GB636620A (en) Improvements in or relating to attenuation equalizers
GB554329A (en) Impedance hatching networks for use in electrical transmission systems
US3808369A (en) Attenuation equalizing acoustic coupler
GB897613A (en) Improvements in or relating to voice-frequency amplifiers
GB549926A (en) Attenuation equalizer
GB397551A (en) Improvements in electrical impedance networks and amplifiers
GB899240A (en) Wave transmission network
GB616045A (en) Improvements in and relating to distortion reducing circuits for frequency modulatedoscillation systems
US2202386A (en) Telephone circuit
GB599299A (en) Equaliser for telephonic repeaters
GB534107A (en) Improvements in or relating to filter networks
GB524095A (en) Improvements in or relating to amplitude and phase adjusting networks for alternating current
GB514997A (en) Improvements in or relating to resistance elements
GB1075013A (en) Improvements in or relating to frequency response modifying arrangements for condenser microphones
GB869141A (en) Eight-terminal directional filter network with constant impedance on the four pairs of terminals
GB486372A (en) Automatic volume control devices for wave transmission systems
US2282434A (en) Speech transmission system
GB675562A (en) Improvements in or relating to electrical signal translating circuits
GB457236A (en) Improvements in or relating to electric filters
GB562392A (en) Improvements in or relating to negative feedback amplifiers
GB415717A (en) Improvements in echo suppressors or other similar blocking arrangements for telephone and like transmission systems