FR2404336A1 - NOISE ELIMINATION CIRCUIT - Google Patents

NOISE ELIMINATION CIRCUIT

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
signal
noise
noise elimination
elimination circuit
phase difference
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.)
Faurecia Clarion Electronics 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 claimed from JP11470077A external-priority patent/JPS5448469A/en
Priority claimed from JP1631378A external-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
Granted 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
    • H03G3/34—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
    • H03G3/345—Muting during a short period of time when noise pulses are detected, i.e. blanking

Landscapes

  • Noise Elimination (AREA)
  • Networks Using Active Elements (AREA)
  • Amplifiers (AREA)

Abstract

L'invention concerne un circuit d'élimination du bruit 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. L'invention s'applique notamment à l'élimination du bruit de récepteurs-radio à modulation d'amplitude ou de transceivers.The invention relates to a noise elimination circuit According to the invention, it comprises a means 3 for producing a signal having a phase difference with respect to a received signal, a means 2 for simultaneously interrupting the received signal and the signal of phase difference at the moment when noise is introduced into the circuit, means C 1, C2 and C3 for maintaining the levels of the respective signals which have developed immediately after switching off the signals, and means 5 for transmitting a signal retained at a level by adding it to a signal held at another level at a given time constant. The invention applies in particular to the elimination of noise from amplitude-modulated radio receivers or transceivers.

FR7827366A 1977-09-26 1978-09-25 NOISE ELIMINATION CIRCUIT Granted FR2404336A1 (en)

Applications Claiming Priority (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 Granted FR2404336A1 (en) 1977-09-26 1978-09-25 NOISE ELIMINATION CIRCUIT

Country Status (5)

Country Link
DE (1) DE2828414A1 (en)
FR (1) FR2404336A1 (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 Nec Corp 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 Method for eliminating or suppressing acoustic interference signals in audio programs to be processed for the playback process

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 SUPPRESSING PARASITES IN AN ELECTRIC SIGNAL RECEIVER
BE758331A (en) * 1969-11-01 1971-04-30 Philips Nv CIRCUIT FOR SUPPRESSING PARASITES IN AN ELECTRIC SIGNAL RECEIVER

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
SE436159B (en) 1984-11-12
NL190039B (en) 1993-05-03
FR2404336B1 (en) 1983-11-25
GB1603391A (en) 1981-11-25
NL7809717A (en) 1979-03-28
DE2828414C2 (en) 1988-09-08
NL190039C (en) 1993-10-01
SE7810016L (en) 1979-03-27
DE2828414A1 (en) 1979-04-05

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Legal Events

Date Code Title Description
ST Notification of lapse