JPS55100715A - Automatic sound volume control broadcasting unit responding to noise intensity of train - Google Patents

Automatic sound volume control broadcasting unit responding to noise intensity of train

Info

Publication number
JPS55100715A
JPS55100715A JP840179A JP840179A JPS55100715A JP S55100715 A JPS55100715 A JP S55100715A JP 840179 A JP840179 A JP 840179A JP 840179 A JP840179 A JP 840179A JP S55100715 A JPS55100715 A JP S55100715A
Authority
JP
Japan
Prior art keywords
train
speed
information
broadcasting unit
station
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
JP840179A
Other languages
English (en)
Japanese (ja)
Other versions
JPS6133405B2 (enExample
Inventor
Masaaki Nakajima
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 JP840179A priority Critical patent/JPS55100715A/ja
Publication of JPS55100715A publication Critical patent/JPS55100715A/ja
Publication of JPS6133405B2 publication Critical patent/JPS6133405B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/53—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers
    • H04H20/61—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers for local area broadcast, e.g. instore broadcast
    • H04H20/62—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers for local area broadcast, e.g. instore broadcast for transportation systems, e.g. in vehicles
    • 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

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Control Of Amplification And Gain Control (AREA)
JP840179A 1979-01-26 1979-01-26 Automatic sound volume control broadcasting unit responding to noise intensity of train Granted JPS55100715A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP840179A JPS55100715A (en) 1979-01-26 1979-01-26 Automatic sound volume control broadcasting unit responding to noise intensity of train

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP840179A JPS55100715A (en) 1979-01-26 1979-01-26 Automatic sound volume control broadcasting unit responding to noise intensity of train

Publications (2)

Publication Number Publication Date
JPS55100715A true JPS55100715A (en) 1980-07-31
JPS6133405B2 JPS6133405B2 (enExample) 1986-08-01

Family

ID=11692151

Family Applications (1)

Application Number Title Priority Date Filing Date
JP840179A Granted JPS55100715A (en) 1979-01-26 1979-01-26 Automatic sound volume control broadcasting unit responding to noise intensity of train

Country Status (1)

Country Link
JP (1) JPS55100715A (enExample)

Also Published As

Publication number Publication date
JPS6133405B2 (enExample) 1986-08-01

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