JPS5362402A - Loudening telephone unit - Google Patents
Loudening telephone unitInfo
- 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
Links
- 230000005540 biological transmission Effects 0.000 abstract 1
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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
- Control Of Amplification And Gain Control (AREA)
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.
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0626380B1 (en) * | 1988-12-16 | 1994-04-06 | Nippon Electric Co |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5052904A (en) * | 1973-09-10 | 1975-05-10 |
-
1976
- 1976-11-16 JP JP51138157A patent/JPS584864B2/en not_active Expired
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5052904A (en) * | 1973-09-10 | 1975-05-10 |
Cited By (1)
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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