GB499142A - Electric wave selecting device - Google Patents

Electric wave selecting device

Info

Publication number
GB499142A
GB499142A GB19537/37A GB1953737A GB499142A GB 499142 A GB499142 A GB 499142A GB 19537/37 A GB19537/37 A GB 19537/37A GB 1953737 A GB1953737 A GB 1953737A GB 499142 A GB499142 A GB 499142A
Authority
GB
United Kingdom
Prior art keywords
frequencies
july
crystals
diffraction grating
aperiodic
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
GB19537/37A
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 GB499142A publication Critical patent/GB499142A/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

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Aerials With Secondary Devices (AREA)

Abstract

499,142. Frequency-altering systems. STANDARD TELEPHONES & CABLES, Ltd. July 14, 1937, No. 19537. Convention date, July 18, 1936. [Class 40 (iii)] Mixed frequencies, which may be derived from an aperiodic antenna through resistancecoupled amplifiers, are separated by converting them into waves in an elastic medium and using a diffraction grating or the like for the purpose of selecting a restricted wave band with uniform attenuation. The mixed electrical frequencies are applied to an aperiodic quartz transmitter QA which is immersed in water or some other fluid medium and screened by absorptive walls PA. In front of the crystal is a diffraction grating E, and at the spectral bands of the first order for a series of different frequencies are piezo-electric receivers, which may comprise either undamped crystals q, or damped crystals q<1> associated with steel blocks or the like a, a<1>, the lengths of these blocks being such that they resonate at the frequencies to be selected. The direct wave is absorbed by spongy rubber or the like SA. The rays may be further dispersed by means of a parabolic reflector, Fig. 4 (not shown).
GB19537/37A 1936-07-18 1937-07-14 Electric wave selecting device Expired GB499142A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR820425T 1936-07-18

Publications (1)

Publication Number Publication Date
GB499142A true GB499142A (en) 1939-01-16

Family

ID=9271955

Family Applications (1)

Application Number Title Priority Date Filing Date
GB19537/37A Expired GB499142A (en) 1936-07-18 1937-07-14 Electric wave selecting device

Country Status (3)

Country Link
US (1) US2169304A (en)
FR (1) FR820425A (en)
GB (1) GB499142A (en)

Families Citing this family (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2632521A (en) * 1953-03-24 Frequency selector
US2435595A (en) * 1942-02-19 1948-02-10 Bell Telephone Labor Inc High-power compressional wave radiator
US2658186A (en) * 1942-03-12 1953-11-03 Bell Telephone Labor Inc Prismatic directional and object locating system
US2423459A (en) * 1942-09-15 1947-07-08 Bell Telephone Labor Inc Frequency selective apparatus
US2434278A (en) * 1943-03-04 1948-01-13 Bell Telephone Labor Inc Submarine detecting device
US3016513A (en) * 1943-05-26 1962-01-09 Karl S Van Dyke Fm echo-ranging system
US2434667A (en) * 1943-06-05 1948-01-20 Bell Telephone Labor Inc Ultrasonic prism
US2421026A (en) * 1943-07-08 1947-05-27 Bell Telephone Labor Inc Delay device
US2438936A (en) * 1943-10-06 1948-04-06 Bell Telephone Labor Inc Electromechanical transducer
US2455389A (en) * 1944-02-14 1948-12-07 William H Woodin Jr Method and apparatus for separating audio frequencies
US2416338A (en) * 1945-04-11 1947-02-25 Bell Telephone Labor Inc Frequency selective system
US2935728A (en) * 1946-02-15 1960-05-03 Rca Corp Underwater object locator
US2539535A (en) * 1946-03-16 1951-01-30 Bell Telephone Labor Inc Source of electrical energy
US2629827A (en) * 1947-10-31 1953-02-24 Eckert Mauchly Comp Corp Memory system
US2643286A (en) * 1950-06-21 1953-06-23 Hurvitz Hyman Spectrum analyzer for compressional waves
US2936416A (en) * 1954-06-11 1960-05-10 Hurvitz Hyman Frequency indicator
GB988102A (en) * 1962-08-03 1965-04-07 Marconi Co Ltd Improvements in or relating to wave-energy delay cells
US3522557A (en) * 1963-07-19 1970-08-04 Bell Telephone Labor Inc Acoustic delay line
US3293574A (en) * 1963-11-20 1966-12-20 Goodyear Aerospace Corp Diffraction delay line for pulse expansion and compression
FR657592A (en) * 1963-12-24 1929-06-06 Flue improvements
US3696313A (en) * 1970-07-29 1972-10-03 Zenith Radio Corp Arrangement for converting between acoustic compressional waves and surface waves
DE2742492C3 (en) * 1977-03-24 1984-07-19 Kohji Yokosuka Kanagawa Toda Ultrasonic transducer
FR2620294B1 (en) * 1987-09-07 1990-01-19 Technomed Int Sa PIEZOELECTRIC DEVICE WITH REDUCED NEGATIVE WAVES, AND USE THEREOF FOR EXTRA-BODY LITHOTRITIS OR FOR THE DESTRUCTION OF SPECIAL TISSUES
US7541240B2 (en) 2005-10-18 2009-06-02 Sandisk Corporation Integration process flow for flash devices with low gap fill aspect ratio

Also Published As

Publication number Publication date
US2169304A (en) 1939-08-15
FR820425A (en) 1937-11-10

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