JPS547811A - Noise reduction unit of companding system - Google Patents

Noise reduction unit of companding system

Info

Publication number
JPS547811A
JPS547811A JP7471377A JP7471377A JPS547811A JP S547811 A JPS547811 A JP S547811A JP 7471377 A JP7471377 A JP 7471377A JP 7471377 A JP7471377 A JP 7471377A JP S547811 A JPS547811 A JP S547811A
Authority
JP
Japan
Prior art keywords
noise reduction
reduction unit
companding
companding system
frequency band
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
JP7471377A
Other languages
Japanese (ja)
Inventor
Kenichi Sato
Masaru Nishimura
Tetsuo Shimizu
Takehiko Asano
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.)
Sanyo Electric Co Ltd
Original Assignee
Sanyo Electric 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 Sanyo Electric Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP7471377A priority Critical patent/JPS547811A/en
Publication of JPS547811A publication Critical patent/JPS547811A/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
    • H03G9/025—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers frequency-dependent volume compression or expansion, e.g. multiple-band systems

Landscapes

  • Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)

Abstract

PURPOSE:To effectively perform the reduction in noise and to perform the reproduction of original tone with high fidelity, by companding all the bands of the delivery signal depending on the signal level of a high frequency band, and by changing a low frequency band complementarily with companding according on the sibnal level ration in low and high frequency bands.
JP7471377A 1977-06-20 1977-06-20 Noise reduction unit of companding system Pending JPS547811A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7471377A JPS547811A (en) 1977-06-20 1977-06-20 Noise reduction unit of companding system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7471377A JPS547811A (en) 1977-06-20 1977-06-20 Noise reduction unit of companding system

Publications (1)

Publication Number Publication Date
JPS547811A true JPS547811A (en) 1979-01-20

Family

ID=13555127

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7471377A Pending JPS547811A (en) 1977-06-20 1977-06-20 Noise reduction unit of companding system

Country Status (1)

Country Link
JP (1) JPS547811A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6490231B1 (en) 1997-12-25 2002-12-03 Seiko Instruments Inc. Intermittent feeding mechanism
JP2016009935A (en) * 2014-06-23 2016-01-18 ローム株式会社 Level adjustment circuit, digital sound processor, audio amplifier integrated circuit, electronic apparatus, and automatic level adjustment method of audio signal

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6490231B1 (en) 1997-12-25 2002-12-03 Seiko Instruments Inc. Intermittent feeding mechanism
JP2016009935A (en) * 2014-06-23 2016-01-18 ローム株式会社 Level adjustment circuit, digital sound processor, audio amplifier integrated circuit, electronic apparatus, and automatic level adjustment method of audio signal

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