JPS6444743U - - Google Patents
Info
- Publication number
- JPS6444743U JPS6444743U JP13863187U JP13863187U JPS6444743U JP S6444743 U JPS6444743 U JP S6444743U JP 13863187 U JP13863187 U JP 13863187U JP 13863187 U JP13863187 U JP 13863187U JP S6444743 U JPS6444743 U JP S6444743U
- Authority
- JP
- Japan
- Prior art keywords
- amplification
- telephone
- component
- detection means
- telephone line
- 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
- 230000003321 amplification Effects 0.000 claims description 7
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
Description
第1図ないし第3図は本考案の一実施例を示す
ものであつて、第1図は電話機の構成を示すブロ
ツク図、第2図は電話回線を介して送られる音声
信号の例を示すグラフ、第3図はパワーアンプの
ダイナミツクレンジと出力される音声信号のレベ
ルとの関係を示すグラフ、第4図は電話回線の長
さと電話回線を介して送られる直流成分の大きさ
との関係を示すグラフである。第5図は従来の電
話機におけるアンプの出力信号に発生する歪を示
すグラフである。
11は電話機、13は電話回線、14はループ
電流検出回路(検出手段)、19はパワーアンプ
(増幅手段)、21はオートレベルコントロール
回路(増幅率調整手段)である。
Figures 1 to 3 show an embodiment of the present invention, in which Figure 1 is a block diagram showing the configuration of a telephone, and Figure 2 shows an example of a voice signal sent via a telephone line. Figure 3 is a graph showing the relationship between the dynamic range of the power amplifier and the level of the output audio signal, and Figure 4 is the relationship between the length of the telephone line and the magnitude of the DC component sent through the telephone line. This is a graph showing. FIG. 5 is a graph showing distortion occurring in the output signal of an amplifier in a conventional telephone. 11 is a telephone, 13 is a telephone line, 14 is a loop current detection circuit (detection means), 19 is a power amplifier (amplification means), and 21 is an auto level control circuit (amplification factor adjustment means).
Claims (1)
る増幅手段を備えた電話機において、 上記直流成分の大きさを検出する検出手段と、 検出手段の出力と、増幅手段の出力信号レベル
とに基づいて増幅手段の増幅率を調整する増幅率
調整手段とを備えたことを特徴とする電話機。[Scope of Claim for Utility Model Registration] In a telephone equipped with an amplification means whose power source is a DC component sent through a telephone line, a detection means for detecting the magnitude of the DC component, an output of the detection means, and an amplification means. and amplification factor adjustment means for adjusting the amplification factor of the amplification means based on the output signal level of the telephone.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13863187U JPS6444743U (en) | 1987-09-10 | 1987-09-10 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13863187U JPS6444743U (en) | 1987-09-10 | 1987-09-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6444743U true JPS6444743U (en) | 1989-03-17 |
Family
ID=31401142
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13863187U Pending JPS6444743U (en) | 1987-09-10 | 1987-09-10 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6444743U (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61291723A (en) * | 1985-06-20 | 1986-12-22 | Toyota Motor Corp | Mechanical supercharger control device for internal-combustion engine |
JPH0482328U (en) * | 1990-11-28 | 1992-07-17 |
-
1987
- 1987-09-10 JP JP13863187U patent/JPS6444743U/ja active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61291723A (en) * | 1985-06-20 | 1986-12-22 | Toyota Motor Corp | Mechanical supercharger control device for internal-combustion engine |
JPH0482328U (en) * | 1990-11-28 | 1992-07-17 |
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