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JPS55123217A - Automatic loudness correcting device - Google Patents

Automatic loudness correcting device

Info

Publication number
JPS55123217A
JPS55123217A JP3149679A JP3149679A JPS55123217A JP S55123217 A JPS55123217 A JP S55123217A JP 3149679 A JP3149679 A JP 3149679A JP 3149679 A JP3149679 A JP 3149679A JP S55123217 A JPS55123217 A JP S55123217A
Authority
JP
Japan
Prior art keywords
input signal
level
attenuator
attenuation
magnitude
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.)
Pending
Application number
JP3149679A
Other languages
Japanese (ja)
Inventor
Hideki Fujie
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP3149679A priority Critical patent/JPS55123217A/en
Publication of JPS55123217A publication Critical patent/JPS55123217A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G9/00—Combinations of two or more types of control, e.g. gain control and tone control
    • H03G9/02—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers

Landscapes

  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)

Abstract

PURPOSE:To make loudness control by automatically varying the characteristics of an amplifier according to the magnitude of an input signal, by forming a fixed circuit. CONSTITUTION:An input signal from input terminal 2 is amplified by amplifier 1, the output of which is positively fed back to voltage variable attenuator 7 via parallel-connected LPF5 and HPF6. The attenuation of attenuator 7 is controlled by controller 8 according to the level of the input signal. In this controller 8, the input signal is level-detected through filter 9 and rectifier 10 and according to the level of the output voltage, comparator 11 generates corresponding pulses, which are integrated to generate a control signal, thereby adjusting the attenuation of attenuator 7. Thus, the sense of hearing high frequency high frequency range and low frequency range sounds depending upon the magnitude of the input signal can automatically be corrected.
JP3149679A 1979-03-16 1979-03-16 Automatic loudness correcting device Pending JPS55123217A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3149679A JPS55123217A (en) 1979-03-16 1979-03-16 Automatic loudness correcting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3149679A JPS55123217A (en) 1979-03-16 1979-03-16 Automatic loudness correcting device

Publications (1)

Publication Number Publication Date
JPS55123217A true JPS55123217A (en) 1980-09-22

Family

ID=12332847

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3149679A Pending JPS55123217A (en) 1979-03-16 1979-03-16 Automatic loudness correcting device

Country Status (1)

Country Link
JP (1) JPS55123217A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009272926A (en) * 2008-05-08 2009-11-19 Nec Engineering Ltd Limiter compressor device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009272926A (en) * 2008-05-08 2009-11-19 Nec Engineering Ltd Limiter compressor device
JP4666320B2 (en) * 2008-05-08 2011-04-06 Ｎｅｃエンジニアリング株式会社 Limiter / Compressor

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