FR2404336A1 - Circuit noise elimination - Google Patents

Circuit noise elimination

Info

Publication number
FR2404336A1
FR2404336A1 FR7827366A FR7827366A FR2404336A1 FR 2404336 A1 FR2404336 A1 FR 2404336A1 FR 7827366 A FR7827366 A FR 7827366A FR 7827366 A FR7827366 A FR 7827366A FR 2404336 A1 FR2404336 A1 FR 2404336A1
Authority
FR
France
Prior art keywords
gt
lt
signal
means
noise
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.)
Granted
Application number
FR7827366A
Other languages
French (fr)
Other versions
FR2404336B1 (en
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.)
Clarion Co Ltd
Original Assignee
Clarion Co 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 JP11470077A priority Critical patent/JPS5448469A/en
Priority to JP1631378A priority patent/JPH0230211B2/en
Application filed by Clarion Co Ltd filed Critical Clarion Co Ltd
Publication of FR2404336A1 publication Critical patent/FR2404336A1/en
Application granted granted Critical
Publication of FR2404336B1 publication Critical patent/FR2404336B1/fr
Application status is Expired legal-status Critical

Links

Classifications

    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03GCONTROL OF AMPLIFICATION
    • H03G3/00Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/20Automatic control
    • H03G3/30Automatic control in amplifiers having semiconductor devices
    • H03G3/34Muting 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
    • H03G3/345Muting during a short period of time when noise pulses are detected, i.e. blanking

Abstract

<P>L'invention concerne un circuit d'élimination du bruit </P><P>Selon l'invention, il comprend un moyen 3 pour produire un signal ayant une différence de phase par rapport à un signal reçu, un moyen 2 pour interrompre simultanément le signal reçu et le signal de différence de phase au moment où un bruit est introduit dans le circuit, un moyen C 1 , C2 et C3 pour conserver les niveaux des signaux respectifs qui se sont développés immédiatement après coupure des signaux, et un moyen 5 pour émettre un signal retenu à un niveau en l'ajoutant à un signal retenu à un autre niveau à une constante de temps donnée. <P> The invention relates to a noise eliminating circuit </ P> <P> According to the invention, it comprises a means 3 for generating a signal having a phase difference with respect to a received signal, means 2 to simultaneously interrupt the received signal and the phase difference signal when a noise is introduced into the circuit, means C 1, C2 and C3 to maintain the levels of respective signals that have developed immediately after disconnecting of the signals, and means 5 for outputting a signal held at a level by adding it to a selected signal to another level at a given time constant. </P><P>L'invention s'applique notamment à l'élimination du bruit de récepteurs-radio à modulation d'amplitude ou de transceivers.</P> </ P> <P> The invention is particularly applicable to the removal of noise radio receivers amplitude modulation or transceivers. </ P>
FR7827366A 1977-09-26 1978-09-25 Expired FR2404336B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP11470077A JPS5448469A (en) 1977-09-26 1977-09-26 Noise eliminating circuit
JP1631378A JPH0230211B2 (en) 1978-02-15 1978-02-15 Zatsuonjokyokairo

Publications (2)

Publication Number Publication Date
FR2404336A1 true FR2404336A1 (en) 1979-04-20
FR2404336B1 FR2404336B1 (en) 1983-11-25

Family

ID=26352631

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7827366A Expired FR2404336B1 (en) 1977-09-26 1978-09-25

Country Status (5)

Country Link
DE (1) DE2828414C2 (en)
FR (1) FR2404336B1 (en)
GB (1) GB1603391A (en)
NL (1) NL190039C (en)
SE (1) SE436159B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5514734A (en) * 1978-07-17 1980-02-01 Clarion Co Ltd Pulse noise elimination circuit
US4311963A (en) * 1978-07-18 1982-01-19 Matsushita Electric Industrial Co., Ltd. Noise pulse suppressing system
US4232340A (en) * 1979-06-01 1980-11-04 Rca Corporation Defect compensation for color television
DE3028334C2 (en) * 1980-07-25 1983-01-05 Polygram Gmbh, 2000 Hamburg, De

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3588705A (en) * 1969-11-12 1971-06-28 Nasa Frequency-modulation demodulator threshold extension device
US3689845A (en) * 1969-11-01 1972-09-05 Philips Corp Circuit arrangement for suppressing interferences in a receiver of electrical signals
US3947636A (en) * 1974-08-12 1976-03-30 Edgar Albert D Transient noise filter employing crosscorrelation to detect noise and autocorrelation to replace the noisey segment
US3983488A (en) * 1974-06-17 1976-09-28 California Microwave, Inc. Frequency-modulation demodulator threshold extension device

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE757970A (en) * 1969-10-25 1971-04-23 Philips Nv Circuit for removing noise in a recepteurde electric signals
BE758331A (en) * 1969-11-01 1971-04-30 Philips Nv Circuit for removing noise in a recepteurde electric signals

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3689845A (en) * 1969-11-01 1972-09-05 Philips Corp Circuit arrangement for suppressing interferences in a receiver of electrical signals
US3588705A (en) * 1969-11-12 1971-06-28 Nasa Frequency-modulation demodulator threshold extension device
US3983488A (en) * 1974-06-17 1976-09-28 California Microwave, Inc. Frequency-modulation demodulator threshold extension device
US3947636A (en) * 1974-08-12 1976-03-30 Edgar Albert D Transient noise filter employing crosscorrelation to detect noise and autocorrelation to replace the noisey segment

Also Published As

Publication number Publication date
NL190039C (en) 1993-10-01
NL7809717A (en) 1979-03-28
GB1603391A (en) 1981-11-25
SE436159B (en) 1984-11-12
SE7810016A (en) 1979-03-27
NL190039B (en) 1993-05-03
FR2404336B1 (en) 1983-11-25
DE2828414C2 (en) 1988-09-08
DE2828414A1 (en) 1979-04-05

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Legal Events

Date Code Title Description
ST Notification of lapse