GB515739A - Improvements in electrical frequency selective apparatus - Google Patents

Improvements in electrical frequency selective apparatus

Info

Publication number
GB515739A
GB515739A GB13848/38A GB1384838A GB515739A GB 515739 A GB515739 A GB 515739A GB 13848/38 A GB13848/38 A GB 13848/38A GB 1384838 A GB1384838 A GB 1384838A GB 515739 A GB515739 A GB 515739A
Authority
GB
United Kingdom
Prior art keywords
circuit
resonant
devices
selective
phase
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
GB13848/38A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB515739A publication Critical patent/GB515739A/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
    • H03H9/545—Filters comprising resonators of piezoelectric or electrostrictive material including active elements
    • 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)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
  • Oscillators With Electromechanical Resonators (AREA)
  • Filters And Equalizers (AREA)

Abstract

515,739. Impedance networks. ROBINSON, J. May, 9, 1938, No. 13848. Divided out of and Addition to 509,040. [Class 40 (iii)] A frequency-selective circuit having a bandpass or band-absorption characteristic comprises two or more selective circuits A, B of the kind described in Specification 509,040 in which each circuit comprises two resonant devices, such as piezo-electric devices 13, 14 and 46, 47, connected in parallel and fed in opposed phase (or having their outputs connected in opposed phase), a non-resonant phase-changing device, such as a condenser 16, 49, being connected in parallel with one of the resonant devices. The corresponding resonant devices 13, 46 and 14, 47 in each circuit have substantially the same resonant frequency, but the condensers 16, 49 are differently adjusted so that each selective circuit has a minimum or zero response at two frequencies which are different for each circuit, e.g. at f2, f3 for one circuit and at f4, f5 for the other. Specifications 509,141 and 509,235 also are referred to.
GB13848/38A 1937-10-06 1938-05-09 Improvements in electrical frequency selective apparatus Expired GB515739A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB27130/37A GB509040A (en) 1937-10-06 1937-10-06 Improvements in electrical frequency selective circuits

Publications (1)

Publication Number Publication Date
GB515739A true GB515739A (en) 1939-12-13

Family

ID=10254703

Family Applications (4)

Application Number Title Priority Date Filing Date
GB12014/39A Expired GB509235A (en) 1937-10-06 1937-10-06 Improvements in electrical frequency selective systems
GB27130/37A Expired GB509040A (en) 1937-10-06 1937-10-06 Improvements in electrical frequency selective circuits
GB13848/38A Expired GB515739A (en) 1937-10-06 1938-05-09 Improvements in electrical frequency selective apparatus
GB17082/38A Expired GB515640A (en) 1937-10-06 1938-06-08 Improvements in electrical frequency-selective systems

Family Applications Before (2)

Application Number Title Priority Date Filing Date
GB12014/39A Expired GB509235A (en) 1937-10-06 1937-10-06 Improvements in electrical frequency selective systems
GB27130/37A Expired GB509040A (en) 1937-10-06 1937-10-06 Improvements in electrical frequency selective circuits

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB17082/38A Expired GB515640A (en) 1937-10-06 1938-06-08 Improvements in electrical frequency-selective systems

Country Status (3)

Country Link
US (1) US2266658A (en)
FR (1) FR844373A (en)
GB (4) GB509235A (en)

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3349347A (en) * 1967-10-24 Sauerland electric wave filter
US2923900A (en) * 1960-02-02 Poschenrieder
US2421026A (en) * 1943-07-08 1947-05-27 Bell Telephone Labor Inc Delay device
US2524781A (en) * 1945-06-18 1950-10-10 Standard Telephones Cables Ltd Filter
US2533802A (en) * 1945-07-20 1950-12-12 Cornell Dubilier Electric Selective amplifier
US2528365A (en) * 1947-07-01 1950-10-31 Crosley Broadcasting Corp Automatic frequency control
US2575047A (en) * 1948-07-14 1951-11-13 Murray G Crosby Exalted carrier receiver
US2579996A (en) * 1949-07-28 1951-12-25 Rca Corp Frequency selective signal amplifying system
US2859416A (en) * 1955-07-18 1958-11-04 Motorola Inc Filter
US2913682A (en) * 1956-07-02 1959-11-17 Hermes Electronics Co Hybrid type filter networks
US2959752A (en) * 1959-03-25 1960-11-08 Hycon Eastern Inc Selective low distortion crystal filter
US3170120A (en) * 1960-09-23 1965-02-16 Garold K Jensen Active comb filter
NL282567A (en) * 1961-08-29
US3416104A (en) * 1965-05-05 1968-12-10 Filtech Corp Band-pass crystal filters
US3483473A (en) * 1966-04-04 1969-12-09 Motorola Inc Frequency converting and selecting system including mixer circuit with field effect transistor coupled to band-pass filter through impedance inverting circuit
US3505617A (en) * 1968-02-12 1970-04-07 Us Navy Ripple reduction in a half-lattice crystal filter using three paralleled crystals resonant at lower,center and upper edge of pass-band
US3510794A (en) * 1968-03-21 1970-05-05 Philamon Lab Inc Multiple tuning fork resonator filter with feedback
US3739286A (en) * 1971-07-06 1973-06-12 J Arnold Crystal filter with temperature compensation
US3783418A (en) * 1973-01-04 1974-01-01 Johnson Electronics Inc Crystal filtering device
DE3006692C2 (en) * 1980-02-22 1983-04-21 Wandel & Goltermann Gmbh & Co, 7412 Eningen Quartz bandpass filter in which the non-linearity of the loss resistance of quartz resonators is taken into account
US4554678A (en) * 1982-12-13 1985-11-19 Honeywell Inc. Wireless receiver having crystal filter at outputs of preamplifier

Also Published As

Publication number Publication date
FR844373A (en) 1939-07-24
US2266658A (en) 1941-12-16
GB509040A (en) 1939-07-06
GB509235A (en) 1939-07-06
GB515640A (en) 1939-12-11

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