JPS55140312A - Sound volume automatic control unit of noise control type speaker - Google Patents

Sound volume automatic control unit of noise control type speaker

Info

Publication number
JPS55140312A
JPS55140312A JP4927179A JP4927179A JPS55140312A JP S55140312 A JPS55140312 A JP S55140312A JP 4927179 A JP4927179 A JP 4927179A JP 4927179 A JP4927179 A JP 4927179A JP S55140312 A JPS55140312 A JP S55140312A
Authority
JP
Japan
Prior art keywords
sound
circuit
section
noise
soundless
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
JP4927179A
Other languages
English (en)
Japanese (ja)
Other versions
JPS6133406B2 (enExample
Inventor
Shunsui Hirano
Takeshi Isogai
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.)
Toa Corp
Toa Tokushu Denki KK
Original Assignee
Toa Electric Co Ltd
Toa Tokushu Denki KK
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 Toa Electric Co Ltd, Toa Tokushu Denki KK filed Critical Toa Electric Co Ltd
Priority to JP4927179A priority Critical patent/JPS55140312A/ja
Publication of JPS55140312A publication Critical patent/JPS55140312A/ja
Publication of JPS6133406B2 publication Critical patent/JPS6133406B2/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
    • H03G3/32—Automatic control in amplifiers having semiconductor devices the control being dependent upon ambient noise level or sound level

Landscapes

  • Control Of Amplification And Gain Control (AREA)
JP4927179A 1979-04-19 1979-04-19 Sound volume automatic control unit of noise control type speaker Granted JPS55140312A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4927179A JPS55140312A (en) 1979-04-19 1979-04-19 Sound volume automatic control unit of noise control type speaker

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4927179A JPS55140312A (en) 1979-04-19 1979-04-19 Sound volume automatic control unit of noise control type speaker

Publications (2)

Publication Number Publication Date
JPS55140312A true JPS55140312A (en) 1980-11-01
JPS6133406B2 JPS6133406B2 (enExample) 1986-08-01

Family

ID=12826168

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4927179A Granted JPS55140312A (en) 1979-04-19 1979-04-19 Sound volume automatic control unit of noise control type speaker

Country Status (1)

Country Link
JP (1) JPS55140312A (enExample)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4984314A (enExample) * 1972-12-18 1974-08-13

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4984314A (enExample) * 1972-12-18 1974-08-13

Also Published As

Publication number Publication date
JPS6133406B2 (enExample) 1986-08-01

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