FR2219599B1 - - Google Patents

Info

Publication number
FR2219599B1
FR2219599B1 FR7405475A FR7405475A FR2219599B1 FR 2219599 B1 FR2219599 B1 FR 2219599B1 FR 7405475 A FR7405475 A FR 7405475A FR 7405475 A FR7405475 A FR 7405475A FR 2219599 B1 FR2219599 B1 FR 2219599B1
Authority
FR
France
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
FR7405475A
Other languages
French (fr)
Other versions
FR2219599A1 (OSRAM
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 FR2219599A1 publication Critical patent/FR2219599A1/fr
Application granted granted Critical
Publication of FR2219599B1 publication Critical patent/FR2219599B1/fr
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers
    • H04R3/02—Circuits for transducers for preventing acoustic reaction, i.e. acoustic oscillatory feedback
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/181—Low-frequency amplifiers, e.g. audio preamplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G5/00—Tone control or bandwidth control in amplifiers
    • H03G5/02—Manually-operated control
    • H03G5/025—Equalizers; Volume or gain control in limited frequency bands
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H11/00—Networks using active elements
    • H03H11/02—Multiple-port networks
    • H03H11/04—Frequency selective two-port networks
    • H03H11/12—Frequency selective two-port networks using amplifiers with feedback
    • H03H11/1217—Frequency selective two-port networks using amplifiers with feedback using a plurality of operational amplifiers

Landscapes

  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Power Engineering (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Amplifiers (AREA)
  • Networks Using Active Elements (AREA)
FR7405475A 1973-02-20 1974-02-19 Expired FR2219599B1 (OSRAM)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7302303A NL7302303A (OSRAM) 1973-02-20 1973-02-20

Publications (2)

Publication Number Publication Date
FR2219599A1 FR2219599A1 (OSRAM) 1974-09-20
FR2219599B1 true FR2219599B1 (OSRAM) 1982-05-07

Family

ID=19818261

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7405475A Expired FR2219599B1 (OSRAM) 1973-02-20 1974-02-19

Country Status (5)

Country Link
JP (1) JPS49115453A (OSRAM)
DE (1) DE2405783C2 (OSRAM)
FR (1) FR2219599B1 (OSRAM)
GB (1) GB1454617A (OSRAM)
NL (1) NL7302303A (OSRAM)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4336501A (en) * 1978-09-26 1982-06-22 Nippon Columbia Kabushiki Kaisha Frequency characteristic adjusting circuit
JPS56134815A (en) * 1980-03-24 1981-10-21 Nippon Gakki Seizo Kk Filter circuit
JPS57142013A (en) 1981-02-27 1982-09-02 Sony Corp Active equalizer

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3657480A (en) * 1969-08-22 1972-04-18 Theodore Cheng Multi channel audio system with crossover network feeding separate amplifiers for each channel with direct coupling to low frequency loudspeaker

Also Published As

Publication number Publication date
DE2405783C2 (de) 1981-12-10
DE2405783A1 (de) 1974-08-22
JPS49115453A (OSRAM) 1974-11-05
GB1454617A (en) 1976-11-03
FR2219599A1 (OSRAM) 1974-09-20
NL7302303A (OSRAM) 1974-08-22

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Legal Events

Date Code Title Description
ST Notification of lapse