GB639183A - Improvements in and relating to noise suppression in radio receivers - Google Patents

Improvements in and relating to noise suppression in radio receivers

Info

Publication number
GB639183A
GB639183A GB1031845A GB1031845A GB639183A GB 639183 A GB639183 A GB 639183A GB 1031845 A GB1031845 A GB 1031845A GB 1031845 A GB1031845 A GB 1031845A GB 639183 A GB639183 A GB 639183A
Authority
GB
United Kingdom
Prior art keywords
diode
resistance
cathode
over
derived
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
GB1031845A
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.)
HAROLD ALFRED FAIRHURST
Murphy Radio Ltd
Original Assignee
HAROLD ALFRED FAIRHURST
Murphy Radio 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
Application filed by HAROLD ALFRED FAIRHURST, Murphy Radio Ltd filed Critical HAROLD ALFRED FAIRHURST
Priority to GB1031845A priority Critical patent/GB639183A/en
Publication of GB639183A publication Critical patent/GB639183A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G11/00—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general
    • H03G11/04—Limiting level dependent on strength of signal; Limiting level dependent on strength of carrier on which signal is modulated

Abstract

639,183. Radio receiving circuits. MURPHY RADIO, Ltd., and FAIRHURST, H. A. April 24, 1945, No. 10318. Addition to 532,521. [Class 40 (v)] In an interference suppression system according to the parent Specification, the input circuit of an audio-frequency stage is shunted by a diode provided with a delay bias comprising a D.C. component and also an audio-frequency component derived over a time-delay network. According to the present invention, in such an arrangement the D.C. component is made to vary automatically according to the received signal amplitude. The input to the cathodefollower stage V3 is taken from the potentiometer R1, R2, C1, the resistance R2 being shunted by the diode V2. The cathode of the diode V2 is connected to the cathode load resistance R3 of the valve V3 over the time-delay network L, C and R8. A biassing potential varying according to signal strength is applied to the anode of the diode V2 over the resistance R2, being derived from the diode V4. The diode V4 may, as shown, be connected across the cathode resistance R3 through blocking condensers C2, C3, C6, a variable datum potential being derived from the potentiometer R7. Alternatively (Figs. 6, 7, not shown), the cathode of the diode V4 may be returned over a D.C. path to a variable tapping on the resistance R3, the resistance R2 being returned to a tapping point in the load circuit of the diode V4. It is stated that the arrangement may be further modified to give a biassing potential which is also dependent upon the frequency of the received signal.
GB1031845A 1945-04-24 1945-04-24 Improvements in and relating to noise suppression in radio receivers Expired GB639183A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1031845A GB639183A (en) 1945-04-24 1945-04-24 Improvements in and relating to noise suppression in radio receivers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1031845A GB639183A (en) 1945-04-24 1945-04-24 Improvements in and relating to noise suppression in radio receivers

Publications (1)

Publication Number Publication Date
GB639183A true GB639183A (en) 1950-06-21

Family

ID=9965663

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1031845A Expired GB639183A (en) 1945-04-24 1945-04-24 Improvements in and relating to noise suppression in radio receivers

Country Status (1)

Country Link
GB (1) GB639183A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2898460A (en) * 1955-05-13 1959-08-04 Morris J Taubenslag D. c. discriminator gating circuit
US2963653A (en) * 1955-06-07 1960-12-06 Hughes Aircraft Co Optimum biasing binary threshold device for responding to pulses in presence of noise

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2898460A (en) * 1955-05-13 1959-08-04 Morris J Taubenslag D. c. discriminator gating circuit
US2963653A (en) * 1955-06-07 1960-12-06 Hughes Aircraft Co Optimum biasing binary threshold device for responding to pulses in presence of noise

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