JPS5714205A - Automatic controller for audio level - Google Patents

Automatic controller for audio level

Info

Publication number
JPS5714205A
JPS5714205A JP8889780A JP8889780A JPS5714205A JP S5714205 A JPS5714205 A JP S5714205A JP 8889780 A JP8889780 A JP 8889780A JP 8889780 A JP8889780 A JP 8889780A JP S5714205 A JPS5714205 A JP S5714205A
Authority
JP
Japan
Prior art keywords
audio signal
level
losser
level detecting
output
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.)
Granted
Application number
JP8889780A
Other languages
Japanese (ja)
Other versions
JPH0158686B2 (en
Inventor
Masuo Wada
Norizou Nakamura
Hisao Ishii
Kiyoshi Nakada
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.)
TOKYO DENSHI KOGYO KK
Toshiba Corp
Tokyo Electronic Industry Co Ltd
Original Assignee
TOKYO DENSHI KOGYO KK
Toshiba Corp
Tokyo Electronic Industry Co Ltd
Tokyo Shibaura 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 TOKYO DENSHI KOGYO KK, Toshiba Corp, Tokyo Electronic Industry Co Ltd, Tokyo Shibaura Electric Co Ltd filed Critical TOKYO DENSHI KOGYO KK
Priority to JP8889780A priority Critical patent/JPS5714205A/en
Publication of JPS5714205A publication Critical patent/JPS5714205A/en
Publication of JPH0158686B2 publication Critical patent/JPH0158686B2/ja
Granted 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
    • H03G3/3026—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers the gain being discontinuously variable, e.g. controlled by switching

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To exercise accurate control by finding the area of an audio signal within a prescribed time. CONSTITUTION:An audio signal arriving via an input terminal 11 is led to an output terminal 13 via a losser 12 and also supplied to a level detecting circuit 14. The level detecting circut 14 finds the area of the audio signal and also calculates the mean value of its audio level digitally, and its output is supplied to a microcomputer 15. The microcomputer 15 discriminates between a voice and music on the basis of the output signal of the level detecting circuit 14 and then corrects a detected level according to the discrimination result. When the corrected signal goes beyond a prescribed blind sector region, a controlled variable consisting of digital bit data is generated and applied to the losser 12 via a control interface part 17. Consequently, the losser 12 is controlled to hold the audio signal at a desired level.
JP8889780A 1980-06-30 1980-06-30 Automatic controller for audio level Granted JPS5714205A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8889780A JPS5714205A (en) 1980-06-30 1980-06-30 Automatic controller for audio level

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8889780A JPS5714205A (en) 1980-06-30 1980-06-30 Automatic controller for audio level

Publications (2)

Publication Number Publication Date
JPS5714205A true JPS5714205A (en) 1982-01-25
JPH0158686B2 JPH0158686B2 (en) 1989-12-13

Family

ID=13955745

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8889780A Granted JPS5714205A (en) 1980-06-30 1980-06-30 Automatic controller for audio level

Country Status (1)

Country Link
JP (1) JPS5714205A (en)

Also Published As

Publication number Publication date
JPH0158686B2 (en) 1989-12-13

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