JPH0134408B2 - - Google Patents

Info

Publication number
JPH0134408B2
JPH0134408B2 JP57002061A JP206182A JPH0134408B2 JP H0134408 B2 JPH0134408 B2 JP H0134408B2 JP 57002061 A JP57002061 A JP 57002061A JP 206182 A JP206182 A JP 206182A JP H0134408 B2 JPH0134408 B2 JP H0134408B2
Authority
JP
Japan
Prior art keywords
output
audio
input
feedback
voltage
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.)
Expired
Application number
JP57002061A
Other languages
English (en)
Japanese (ja)
Other versions
JPS58119214A (ja
Inventor
Hideyo Ono
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP206182A priority Critical patent/JPS58119214A/ja
Priority to US06/453,545 priority patent/US4506381A/en
Publication of JPS58119214A publication Critical patent/JPS58119214A/ja
Publication of JPH0134408B2 publication Critical patent/JPH0134408B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
    • H04M1/6008—Substation equipment, e.g. for use by subscribers including speech amplifiers in the transmitter circuit

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Control Of Amplification And Gain Control (AREA)
JP206182A 1981-12-29 1982-01-09 送話装置 Granted JPS58119214A (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP206182A JPS58119214A (ja) 1982-01-09 1982-01-09 送話装置
US06/453,545 US4506381A (en) 1981-12-29 1982-12-27 Aural transmitter device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP206182A JPS58119214A (ja) 1982-01-09 1982-01-09 送話装置

Publications (2)

Publication Number Publication Date
JPS58119214A JPS58119214A (ja) 1983-07-15
JPH0134408B2 true JPH0134408B2 (enrdf_load_stackoverflow) 1989-07-19

Family

ID=11518821

Family Applications (1)

Application Number Title Priority Date Filing Date
JP206182A Granted JPS58119214A (ja) 1981-12-29 1982-01-09 送話装置

Country Status (1)

Country Link
JP (1) JPS58119214A (enrdf_load_stackoverflow)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4630304A (en) * 1985-07-01 1986-12-16 Motorola, Inc. Automatic background noise estimator for a noise suppression system
US4628529A (en) * 1985-07-01 1986-12-09 Motorola, Inc. Noise suppression system

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56128720U (enrdf_load_stackoverflow) * 1980-02-28 1981-09-30

Also Published As

Publication number Publication date
JPS58119214A (ja) 1983-07-15

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