JPS49115453A - - Google Patents

Info

Publication number
JPS49115453A
JPS49115453A JP49019325A JP1932574A JPS49115453A JP S49115453 A JPS49115453 A JP S49115453A JP 49019325 A JP49019325 A JP 49019325A JP 1932574 A JP1932574 A JP 1932574A JP S49115453 A JPS49115453 A JP S49115453A
Authority
JP
Japan
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.)
Pending
Application number
JP49019325A
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 filed Critical
Publication of JPS49115453A publication Critical patent/JPS49115453A/ja
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/02—Circuits for transducers, loudspeakers or microphones 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)
  • Networks Using Active Elements (AREA)
  • Amplifiers (AREA)
JP49019325A 1973-02-20 1974-02-18 Pending JPS49115453A (ja)

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
JPS49115453A true JPS49115453A (ja) 1974-11-05

Family

ID=19818261

Family Applications (1)

Application Number Title Priority Date Filing Date
JP49019325A Pending JPS49115453A (ja) 1973-02-20 1974-02-18

Country Status (5)

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

Families Citing this family (2)

* 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

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
FR2219599B1 (ja) 1982-05-07
DE2405783A1 (de) 1974-08-22
GB1454617A (en) 1976-11-03
NL7302303A (ja) 1974-08-22
FR2219599A1 (ja) 1974-09-20

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