JPS5362402A - Loudening telephone unit - Google Patents

Loudening telephone unit

Info

Publication number
JPS5362402A
JPS5362402A JP13815776A JP13815776A JPS5362402A JP S5362402 A JPS5362402 A JP S5362402A JP 13815776 A JP13815776 A JP 13815776A JP 13815776 A JP13815776 A JP 13815776A JP S5362402 A JPS5362402 A JP S5362402A
Authority
JP
Japan
Prior art keywords
loudening
telephone unit
utilizing
quality
communication
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
JP13815776A
Other languages
Japanese (ja)
Other versions
JPS584864B2 (en
Inventor
Seiji Nakama
Kenichiro Oota
Hiroo Mafune
Hiroyoshi Suzuki
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP51138157A priority Critical patent/JPS584864B2/en
Publication of JPS5362402A publication Critical patent/JPS5362402A/en
Publication of JPS584864B2 publication Critical patent/JPS584864B2/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • 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
    • 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
    • H04M9/10—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic with switching of direction of transmission by voice frequency

Abstract

PURPOSE:To improve the quality of communication, by utilizing the AGC effect on the receiving system to the variable loss circuit of the transmission system.
JP51138157A 1976-11-16 1976-11-16 public address telephone equipment Expired JPS584864B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP51138157A JPS584864B2 (en) 1976-11-16 1976-11-16 public address telephone equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP51138157A JPS584864B2 (en) 1976-11-16 1976-11-16 public address telephone equipment

Publications (2)

Publication Number Publication Date
JPS5362402A true JPS5362402A (en) 1978-06-03
JPS584864B2 JPS584864B2 (en) 1983-01-28

Family

ID=15215342

Family Applications (1)

Application Number Title Priority Date Filing Date
JP51138157A Expired JPS584864B2 (en) 1976-11-16 1976-11-16 public address telephone equipment

Country Status (1)

Country Link
JP (1) JPS584864B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0626380B1 (en) * 1988-12-16 1994-04-06 Nippon Electric Co

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5052904A (en) * 1973-09-10 1975-05-10

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5052904A (en) * 1973-09-10 1975-05-10

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0626380B1 (en) * 1988-12-16 1994-04-06 Nippon Electric Co

Also Published As

Publication number Publication date
JPS584864B2 (en) 1983-01-28

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