JPS61168747U - - Google Patents
Info
- Publication number
- JPS61168747U JPS61168747U JP5289885U JP5289885U JPS61168747U JP S61168747 U JPS61168747 U JP S61168747U JP 5289885 U JP5289885 U JP 5289885U JP 5289885 U JP5289885 U JP 5289885U JP S61168747 U JPS61168747 U JP S61168747U
- Authority
- JP
- Japan
- Prior art keywords
- output
- feedback
- voltage comparator
- audio
- circuit
- 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 5
- 238000003199 nucleic acid amplification method Methods 0.000 claims 5
- 230000005236 sound signal Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
Description
第１図はこの考案の一実施例による電話器を示
すブロツク図、第２図は従来の電話器を示すブロ
ツク図である。
１は送話器、２，３および６は増幅器、４は受
話器、５はフイルタ回路、７は整流回路、８は電
圧比較器、９は音声帰還増幅回路、１０はアナロ
グスイツチ、１１は帰還回路、ＲＶは可変抵抗器
、Ｒ１〜Ｒ３は抵抗。なお、図中、同一符号は同
一または相当部分を示す。
FIG. 1 is a block diagram showing a telephone according to an embodiment of this invention, and FIG. 2 is a block diagram showing a conventional telephone. 1 is a transmitter, 2, 3 and 6 are amplifiers, 4 is a receiver, 5 is a filter circuit, 7 is a rectifier circuit, 8 is a voltage comparator, 9 is an audio feedback amplifier circuit, 10 is an analog switch, 11 is a feedback circuit , RV is a variable resistor, and R 1 to R 3 are resistances. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.
Claims (1)
増幅する可変増幅度音声増幅器を備え、送話ライ
ンに、送話器より入力される雑音信号を検出する
フイルタ回路と、このフイルタ回路からの出力を
整流する整流回路と、この整流回路の整流出力電
圧をあらかじめ定められた基準電圧と比較する電
圧比較器とを備え、上記電圧比較器の出力に応じ
て上記可変増幅度音声増幅器の増幅度を制御する
ことを特徴とする電話器。 (2) 上記可変増幅度音声増幅器が、上記電圧比
較器の出力に応じて帰還量を変えて増幅度を制御
する帰還回路を有する音声帰還増幅器であること
を特徴とする実用新案登録請求の範囲第１項記載
の電話器。[Claims for Utility Model Registration] (1) The receiving line is equipped with a variable amplification audio amplifier that amplifies the transmitted audio signal, and the transmitting line is equipped with a noise signal input from the transmitter. It comprises a filter circuit, a rectifier circuit that rectifies the output from the filter circuit, and a voltage comparator that compares the rectified output voltage of the rectifier circuit with a predetermined reference voltage, and according to the output of the voltage comparator. A telephone device characterized in that the amplification degree of the variable amplification audio amplifier is controlled. (2) Claims for registration of a utility model characterized in that the variable amplification degree audio amplifier is an audio feedback amplifier having a feedback circuit that controls the amplification degree by changing the amount of feedback according to the output of the voltage comparator. The telephone set forth in paragraph 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5289885U JPS61168747U (en) | 1985-04-08 | 1985-04-08 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5289885U JPS61168747U (en) | 1985-04-08 | 1985-04-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61168747U true JPS61168747U (en) | 1986-10-20 |
Family
ID=30573257
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5289885U Pending JPS61168747U (en) | 1985-04-08 | 1985-04-08 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61168747U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6310622U (en) * | 1986-07-04 | 1988-01-23 | ||
| JPH07307697A (en) * | 1994-05-13 | 1995-11-21 | Nec Corp | Communication equipment |
| EP0717547A2 (en) | 1994-12-12 | 1996-06-19 | Nec Corporation | Automaticaly variable circuit of sound level of received voice signal in telephone |
-
1985
- 1985-04-08 JP JP5289885U patent/JPS61168747U/ja active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6310622U (en) * | 1986-07-04 | 1988-01-23 | ||
| JPH07307697A (en) * | 1994-05-13 | 1995-11-21 | Nec Corp | Communication equipment |
| EP0717547A2 (en) | 1994-12-12 | 1996-06-19 | Nec Corporation | Automaticaly variable circuit of sound level of received voice signal in telephone |
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