GB1518725A - Reduction of radio interference due to switching functions in radio receivers - Google Patents

Reduction of radio interference due to switching functions in radio receivers

Info

Publication number
GB1518725A
GB1518725A GB4374476A GB4374476A GB1518725A GB 1518725 A GB1518725 A GB 1518725A GB 4374476 A GB4374476 A GB 4374476A GB 4374476 A GB4374476 A GB 4374476A GB 1518725 A GB1518725 A GB 1518725A
Authority
GB
United Kingdom
Prior art keywords
damping
switching action
control
oct
accomplished
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
GB4374476A
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.)
Licentia Patent Verwaltungs GmbH
Original Assignee
Licentia Patent Verwaltungs GmbH
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 Licentia Patent Verwaltungs GmbH filed Critical Licentia Patent Verwaltungs GmbH
Publication of GB1518725A publication Critical patent/GB1518725A/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
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3052—Automatic control in amplifiers having semiconductor devices in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/34—Muting amplifier when no signal is present or when only weak signals are present, or caused by the presence of noise signals, e.g. squelch systems
    • H03G3/348—Muting in response to a mechanical action or to power supply variations, e.g. during tuning; Click removal circuits
    • 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

Landscapes

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

Abstract

1518725 Muting during tuning LICENTIA PATENT VERWALTUNGS GmbH 21 Oct 1976 [21 Oct 1975] 43744/76 Heading H3Q In an arrangement for reducing interference resulting from switching functions of a radio receiver a gradual increase in the damping of the received signal is initiated in response to a switching action initiation prior to the switching action being accomplished and then the damping is gradually reduced after the switching action has been accomplished. A start signal A for the frequency change process causes a clock pulse generator in control 4 to change the integration constant of an integrator 5 so as to control PIN diodes of a damping element in the above manner. The time curve of the response to voltage factor of the damping element 7 is produced which approaches the Gaussian distribution function or causes the smallest interference at IF filter 8. When the maximum damping is reached a pulse is emitted from the control 4 to digitally switch the frequency of a variable frequency oscillator 2 via a buffer store 3.
GB4374476A 1975-10-21 1976-10-21 Reduction of radio interference due to switching functions in radio receivers Expired GB1518725A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19752547038 DE2547038C3 (en) 1975-10-21 1975-10-21 Method and arrangement for reducing reception interference in radio receivers caused by switching processes

Publications (1)

Publication Number Publication Date
GB1518725A true GB1518725A (en) 1978-07-26

Family

ID=5959650

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4374476A Expired GB1518725A (en) 1975-10-21 1976-10-21 Reduction of radio interference due to switching functions in radio receivers

Country Status (3)

Country Link
DE (1) DE2547038C3 (en)
FR (1) FR2329111A1 (en)
GB (1) GB1518725A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5723009U (en) * 1980-07-14 1982-02-05
DE3537654C2 (en) * 1985-10-23 1995-09-21 Daimler Benz Aerospace Ag Method for reducing interference in the filtering of received signals during channel switching processes in receivers

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3536934A (en) * 1967-10-25 1970-10-27 Gen Electric Wideband automatic gain control circuit
DE1933701B2 (en) * 1969-07-03 1975-06-12 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Push button preset tuning cct for superheat receiver - blocks IF amplifying stages and has automatic sharp tuning
US3822405A (en) * 1971-12-10 1974-07-02 Matsushita Electric Ind Co Ltd Channel selecting apparatus
US3882400A (en) * 1972-11-27 1975-05-06 Sony Corp Broadcast receiver

Also Published As

Publication number Publication date
FR2329111B1 (en) 1983-05-27
FR2329111A1 (en) 1977-05-20
DE2547038B2 (en) 1978-02-16
DE2547038A1 (en) 1977-04-28
DE2547038C3 (en) 1978-10-12

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Legal Events

Date Code Title Description
PS Patent sealed
746 Register noted 'licences of right' (sect. 46/1977)
PCNP Patent ceased through non-payment of renewal fee