JPS61163448U - - Google Patents
Info
- Publication number
- JPS61163448U JPS61163448U JP3957785U JP3957785U JPS61163448U JP S61163448 U JPS61163448 U JP S61163448U JP 3957785 U JP3957785 U JP 3957785U JP 3957785 U JP3957785 U JP 3957785U JP S61163448 U JPS61163448 U JP S61163448U
- Authority
- JP
- Japan
- Prior art keywords
- frequency characteristic
- component
- telephone
- telephone line
- detected
- 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.)
- Pending
Links
- 238000001514 detection method Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
Landscapes
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Description
第１図は本考案に係る周波数特性自動調整装置
を備えた電話機のブロツク的電気回路図、第２図
は電話回線の長さと伝達特性の関係を示す線図、
第３図は電話回線の長さとＤＣ成分の関係を示す
線図、第４図は周波数特性可変増幅器の電話回線
の長さによる周波数特性変化を示す線図である。
１：電話機、２：電話回線、５：送話器、６：
受話器、７，８：周波数特性可変増幅器、９：Ｄ
Ｃ成分検出器。
FIG. 1 is a block electrical circuit diagram of a telephone equipped with an automatic frequency characteristic adjustment device according to the present invention, and FIG. 2 is a diagram showing the relationship between telephone line length and transfer characteristics.
FIG. 3 is a diagram showing the relationship between the length of the telephone line and the DC component, and FIG. 4 is a diagram showing the change in frequency characteristics of the variable frequency characteristic amplifier depending on the length of the telephone line. 1: Telephone, 2: Telephone line, 5: Transmitter, 6:
Receiver, 7, 8: Frequency characteristic variable amplifier, 9: D
C component detector.
Claims (1)
変増幅器を通して受話器に送り音響信号に変換し
て放音するようにし、かつ、 上記電話回線を通じて電話機に入るＤＣ電流又
はＤＣ電圧等のＤＣ成分をＤＣ成分検出回路で検
出し、 上記検出したＤＣ成分の大きさに応じて上記周
波数特性可変増幅器の周波数特性を変化させるよ
うにした電話機の周波数特性自動調整装置。[Claims for Utility Model Registration] A voice signal input through a telephone line is sent to a receiver through a variable frequency characteristic amplifier, converted into an acoustic signal, and emitted, and a DC current or DC voltage input to the telephone through the telephone line. A frequency characteristic automatic adjustment device for a telephone set, wherein a DC component such as the following is detected by a DC component detection circuit, and the frequency characteristic of the variable frequency characteristic amplifier is changed according to the magnitude of the detected DC component.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3957785U JPS61163448U (en) | 1985-03-18 | 1985-03-18 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3957785U JPS61163448U (en) | 1985-03-18 | 1985-03-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61163448U true JPS61163448U (en) | 1986-10-09 |
Family
ID=30547653
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3957785U Pending JPS61163448U (en) | 1985-03-18 | 1985-03-18 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61163448U (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5477552A (en) * | 1977-11-17 | 1979-06-21 | Matsushita Graphic Communic | Optimum equalizer |
| JPS5885660A (en) * | 1981-11-18 | 1983-05-23 | Nec Corp | Amplifier for telephone receiver |
-
1985
- 1985-03-18 JP JP3957785U patent/JPS61163448U/ja active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5477552A (en) * | 1977-11-17 | 1979-06-21 | Matsushita Graphic Communic | Optimum equalizer |
| JPS5885660A (en) * | 1981-11-18 | 1983-05-23 | Nec Corp | Amplifier for telephone receiver |
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