GB734971A - A method of attenuating the noise in radio sets - Google Patents

A method of attenuating the noise in radio sets

Info

Publication number
GB734971A
GB734971A GB11357/53A GB1135753A GB734971A GB 734971 A GB734971 A GB 734971A GB 11357/53 A GB11357/53 A GB 11357/53A GB 1135753 A GB1135753 A GB 1135753A GB 734971 A GB734971 A GB 734971A
Authority
GB
United Kingdom
Prior art keywords
rectifier
detector
absence
signals
line
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
GB11357/53A
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 GB734971A publication Critical patent/GB734971A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/22—Automatic control in amplifiers having discharge tubes
    • H03G3/26—Muting amplifier when no signal is present or when only weak signals are present, or caused by the presence of noise, e.g. squelch systems
    • H03G3/28—Muting amplifier when no signal is present or when only weak signals are present, or caused by the presence of noise, e.g. squelch systems in frequency-modulation receivers ; in angle-modulation receivers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/22—Automatic control in amplifiers having discharge tubes
    • H03G3/26—Muting amplifier when no signal is present or when only weak signals are present, or caused by the presence of noise, e.g. squelch systems

Landscapes

  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)

Abstract

734,971. Radio receiving circuits. STANDARD TELEPHONES & CABLES, Ltd. April 24, 1953 [July 18, 1952], No. 11357/53. Class 40 (5). A frequency-modulation receiver is muted by means of a rectifier 15 which earths the output from the detector 1 in the absence of signals. The detector 1 is of the ratio type feeding an audio output of the line 11 via de-emphasis circuit 9, 10. Rectifier 15 is connected between earth and the line 11 via a D.C. blocking condenser 18, and is rendered conductive in the absence of signals by means of a positive bias, derived over resistor 13. In the presence of a signal carrier, the detector 1 produces a negative potential across condenser 5 which is applied to the rectifier 15 via resistor 12, causing it to become non- conductive.
GB11357/53A 1952-07-18 1953-04-24 A method of attenuating the noise in radio sets Expired GB734971A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE734971X 1952-07-18

Publications (1)

Publication Number Publication Date
GB734971A true GB734971A (en) 1955-08-10

Family

ID=6642008

Family Applications (1)

Application Number Title Priority Date Filing Date
GB11357/53A Expired GB734971A (en) 1952-07-18 1953-04-24 A method of attenuating the noise in radio sets

Country Status (1)

Country Link
GB (1) GB734971A (en)

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