GB514439A - Improvements in or relating to reduction of interference in electric signal transmission systems - Google Patents

Improvements in or relating to reduction of interference in electric signal transmission systems

Info

Publication number
GB514439A
GB514439A GB1343538A GB1343538A GB514439A GB 514439 A GB514439 A GB 514439A GB 1343538 A GB1343538 A GB 1343538A GB 1343538 A GB1343538 A GB 1343538A GB 514439 A GB514439 A GB 514439A
Authority
GB
United Kingdom
Prior art keywords
channel
circuit
main
auxiliary channel
interference
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
GB1343538A
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.)
EMI Ltd
Electrical and Musical Industries Ltd
Original Assignee
EMI Ltd
Electrical and Musical Industries Ltd
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
Priority to GB3099135A priority Critical patent/GB467263A/en
Application filed by EMI Ltd, Electrical and Musical Industries Ltd filed Critical EMI Ltd
Priority to GB1343538A priority patent/GB514439A/en
Publication of GB514439A publication Critical patent/GB514439A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H04B1/14—Automatic detuning arrangements
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G11/00—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general
    • H03G11/004—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general using discharge tubes

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Superheterodyne Receivers (AREA)
  • Noise Elimination (AREA)

Abstract

514,439. Wireless receiving apparatus. ELECTRIC & MUSICAL INDUSTRIES, LTD., and PERCIVAL, W. S. May 5, 1938, No. 13435. Addition to 467,263. [Class 40 (v)] In a circuit for reducing interference as described in the parent Specification, in which a main high selectivity channel is controlled by an auxiliary channel of lower selectivity, increased attenuation of signals in the main channel is effected by utilizing pulses generated in the auxiliary channel to effect de-tuning in main circuit. The Figure shows a local oscillator V1 and a control valve V2 affecting the de-tuning under control of energy from the auxiliary channel applied to terminals T. Preferably the input filter is sufficiently selective to attenuate all the signals capable of passing the intermediate frequency circuit in the de-tuned condition. The choke L in the input of the control valve V2 is' preferably arranged to have a low impedance at the controlling frequency and a high impedance to the oscillator frequency.
GB1343538A 1938-05-05 1938-05-05 Improvements in or relating to reduction of interference in electric signal transmission systems Expired GB514439A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB3099135A GB467263A (en) 1938-05-05 1935-11-08 Improvements in and relating to the reduction of interference in electric signal transmission systems
GB1343538A GB514439A (en) 1938-05-05 1938-05-05 Improvements in or relating to reduction of interference in electric signal transmission systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1343538A GB514439A (en) 1938-05-05 1938-05-05 Improvements in or relating to reduction of interference in electric signal transmission systems

Publications (1)

Publication Number Publication Date
GB514439A true GB514439A (en) 1939-11-08

Family

ID=10022937

Family Applications (2)

Application Number Title Priority Date Filing Date
GB3099135A Expired GB467263A (en) 1938-05-05 1935-11-08 Improvements in and relating to the reduction of interference in electric signal transmission systems
GB1343538A Expired GB514439A (en) 1938-05-05 1938-05-05 Improvements in or relating to reduction of interference in electric signal transmission systems

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB3099135A Expired GB467263A (en) 1938-05-05 1935-11-08 Improvements in and relating to the reduction of interference in electric signal transmission systems

Country Status (1)

Country Link
GB (2) GB467263A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE976373C (en) * 1942-06-09 1963-07-25 Standard Elek K Lorenz Ag Circuit arrangement for eliminating impulse interference in high-frequency receivers

Also Published As

Publication number Publication date
GB467263A (en) 1937-06-08

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