FR2417890A1 - Detecteur de niveau de signal - Google Patents

Detecteur de niveau de signal

Info

Publication number
FR2417890A1
FR2417890A1 FR7904399A FR7904399A FR2417890A1 FR 2417890 A1 FR2417890 A1 FR 2417890A1 FR 7904399 A FR7904399 A FR 7904399A FR 7904399 A FR7904399 A FR 7904399A FR 2417890 A1 FR2417890 A1 FR 2417890A1
Authority
FR
France
Prior art keywords
comparison circuit
signal level
level detector
amplifier
output signal
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.)
Withdrawn
Application number
FR7904399A
Other languages
English (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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of FR2417890A1 publication Critical patent/FR2417890A1/fr
Withdrawn legal-status Critical Current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
    • H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
    • G01R19/16576—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold
    • G01R19/1658—AC voltage or recurrent signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Amplifiers (AREA)
  • Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

Détecteur muni d'un pré-amplificateur et d'un circuit de comparaison. Le signal de sortie du pré-amplificateur est fourni à une entrée du circuit de comparaison sans que la composante de tension continue dudit signal de sortie doive être éliminée à l'aide d'un condensateur de couplage. A cet effet, le détecteur comporte une source de tension de référence qui définit le niveau de tension continue sur la sortie du pré-amplificateur, ainsi que des moyens pour augmenter de la tension de référence le niveau de tension détection du circuit de comparaison. Application aux enregistreurs à cassette.
FR7904399A 1978-02-21 1979-02-21 Detecteur de niveau de signal Withdrawn FR2417890A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7801907A NL7801907A (nl) 1978-02-21 1978-02-21 Detektor.

Publications (1)

Publication Number Publication Date
FR2417890A1 true FR2417890A1 (fr) 1979-09-14

Family

ID=19830366

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7904399A Withdrawn FR2417890A1 (fr) 1978-02-21 1979-02-21 Detecteur de niveau de signal

Country Status (10)

Country Link
US (1) US4245170A (fr)
JP (1) JPS54122955A (fr)
CA (1) CA1138057A (fr)
CH (1) CH641607A5 (fr)
DE (1) DE2906094A1 (fr)
FR (1) FR2417890A1 (fr)
GB (1) GB2020935B (fr)
HK (1) HK19483A (fr)
IT (1) IT1112172B (fr)
NL (1) NL7801907A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2451674A1 (fr) * 1979-03-10 1980-10-10 Philips Nv Circuit pour attenuer des signaux de bruit perturbateurs dans un recepteur fm
EP0370559A2 (fr) * 1988-11-24 1990-05-30 STMicroelectronics S.r.l. Détecteur de niveau du type bipolaire intégrable pour des signaux de hautes fréquences sinusoidaux

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4411805B4 (de) * 1994-04-06 2008-08-28 Michael Riedel Transformatorenbau Elektronik Gmbh Stromsteller
US5517134A (en) * 1994-09-16 1996-05-14 Texas Instruments Incorporated Offset comparator with common mode voltage stability
DE19606792A1 (de) * 1996-02-23 1997-08-28 Abb Daimler Benz Transp Schienenfahrzeug mit Wagenkasten

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA923573A (en) * 1971-03-11 1973-03-27 Northern Electric Company Automatic gain control circuit
US3989959A (en) * 1975-08-28 1976-11-02 Vitatron Medical B.V. Low current drain amplifier incorporating feedback means for establishing sensitivity

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3719895A (en) * 1971-03-11 1973-03-06 Northern Electric Co Automatic gain control circuit
US4143331A (en) * 1977-12-16 1979-03-06 National Semiconductor Corporation Summing amplifier for developing a squelch and meter voltage in a radio receiver

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA923573A (en) * 1971-03-11 1973-03-27 Northern Electric Company Automatic gain control circuit
US3989959A (en) * 1975-08-28 1976-11-02 Vitatron Medical B.V. Low current drain amplifier incorporating feedback means for establishing sensitivity

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2451674A1 (fr) * 1979-03-10 1980-10-10 Philips Nv Circuit pour attenuer des signaux de bruit perturbateurs dans un recepteur fm
EP0370559A2 (fr) * 1988-11-24 1990-05-30 STMicroelectronics S.r.l. Détecteur de niveau du type bipolaire intégrable pour des signaux de hautes fréquences sinusoidaux
EP0370559A3 (fr) * 1988-11-24 1991-05-08 STMicroelectronics S.r.l. Détecteur de niveau du type bipolaire intégrable pour des signaux de hautes fréquences sinusoidaux

Also Published As

Publication number Publication date
CH641607A5 (de) 1984-02-29
US4245170A (en) 1981-01-13
GB2020935A (en) 1979-11-21
NL7801907A (nl) 1979-08-23
IT1112172B (it) 1986-01-13
CA1138057A (fr) 1982-12-21
GB2020935B (en) 1982-03-31
IT7920295A0 (it) 1979-02-16
DE2906094A1 (de) 1979-10-04
HK19483A (en) 1983-06-17
JPS54122955A (en) 1979-09-22

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Legal Events

Date Code Title Description
ST Notification of lapse