GB578512A - Improvements in electrical filters - Google Patents

Improvements in electrical filters

Info

Publication number
GB578512A
GB578512A GB1457741A GB1457741A GB578512A GB 578512 A GB578512 A GB 578512A GB 1457741 A GB1457741 A GB 1457741A GB 1457741 A GB1457741 A GB 1457741A GB 578512 A GB578512 A GB 578512A
Authority
GB
United Kingdom
Prior art keywords
frequency
oscillation
stage
filter
stages
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
GB1457741A
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.)
EDWARD ARMITAGE FIELDING
General Electric Co PLC
Original Assignee
EDWARD ARMITAGE FIELDING
General Electric Co 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 EDWARD ARMITAGE FIELDING, General Electric Co PLC filed Critical EDWARD ARMITAGE FIELDING
Priority to GB1457741A priority Critical patent/GB578512A/en
Publication of GB578512A publication Critical patent/GB578512A/en
Expired legal-status Critical Current

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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Networks Using Active Elements (AREA)

Abstract

578,512. Filtering systems. GENERAL ELECTRIC CO., Ltd., TURNER, H. C., and FIELDING, E. A. Nov. 12, 1941, No. 14577. Drawings to Specification. [Class 40 (iv)] [Also in Group XL] In a system of the type in which an oscillation of a desired frequency, e.g. a desired harmonic in the output circuit of a multivibrator supplied by a crystal-controlled oscillator, is selected by bringing the unseparated (or roughly separated) oscillations by modulation to a lower frequency level at which the required separation is performed by a filter, the selected oscillation being restored by a further modulation stage to the original frequency level, the latter step is performed in a number of stages, a passive filter being used for selecting the desired frequency at each stage. The reduction in frequency before filtering may be done in one or in several stages.
GB1457741A 1941-11-12 1941-11-12 Improvements in electrical filters Expired GB578512A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1457741A GB578512A (en) 1941-11-12 1941-11-12 Improvements in electrical filters

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1457741A GB578512A (en) 1941-11-12 1941-11-12 Improvements in electrical filters

Publications (1)

Publication Number Publication Date
GB578512A true GB578512A (en) 1946-07-02

Family

ID=10043717

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1457741A Expired GB578512A (en) 1941-11-12 1941-11-12 Improvements in electrical filters

Country Status (1)

Country Link
GB (1) GB578512A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3019296A (en) * 1958-08-11 1962-01-30 Bell Telephone Labor Inc Phase stabilization of circuits which employ a heterodyne method
DE1184874B (en) * 1955-12-30 1965-01-07 Beckman Instruments Inc Tunable circuit arrangement with the transmission behavior of a band pass, extremely small bandwidth and high edge steepness
GB2233520A (en) * 1988-12-19 1991-01-09 British Aerospace Frequency filtering apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1184874B (en) * 1955-12-30 1965-01-07 Beckman Instruments Inc Tunable circuit arrangement with the transmission behavior of a band pass, extremely small bandwidth and high edge steepness
US3019296A (en) * 1958-08-11 1962-01-30 Bell Telephone Labor Inc Phase stabilization of circuits which employ a heterodyne method
GB2233520A (en) * 1988-12-19 1991-01-09 British Aerospace Frequency filtering apparatus
GB2233520B (en) * 1988-12-19 1992-05-27 British Aerospace Frequency filtering apparatus

Similar Documents

Publication Publication Date Title
GB1034341A (en) Improvements in and relating to electrical filters
GB578512A (en) Improvements in electrical filters
US5455542A (en) Symmetrical clock crystal oscillator circuit
US2022969A (en) Electrical wave production
US2185635A (en) Frequency divider
US1985046A (en) Electrical wave production
GB537731A (en) Modulating systems for electric wave signalling
US2721264A (en) Device for obtaining multiple or submultiple frequencies of a given frequency
GB1109779A (en) Electrical energy converter
DE69030572D1 (en) LOOP FILTER FOR A FREQUENCY SYNTHESISER
US2541378A (en) Rectangular wave generator control
SE320726B (en)
US3671880A (en) Device for generating a plurality of sinusoidal oscillations in a carrier telephony system
SE9102605L (en) OSCILLATOR CONSTRUCTED AROUND ECL LINER RECEIVER
US3251007A (en) Crystal controlled oscillator having output frequencies other than crystal frequencyharmonics
GB882333A (en) System for handling information
GB1037532A (en) Improvements in or relating to time delay generator circuits
JPS56110406A (en) Filter device for electric vehicle
GB555925A (en) Improvements in frequency or phase modulation of a carrier wave
SU634447A1 (en) Frequency synthesizer
US2460800A (en) Fractional frequency generator
US2903651A (en) Spectrum generator
GB705644A (en) Filter network
GB556641A (en) Improvements in or relating to means for generating oscillatory electric currents of precise frequencies
GB1246695A (en) Improvements in or relating to electric current generators, notably high frequency generators