JPH0485835U - - Google Patents
Info
- Publication number
- JPH0485835U JPH0485835U JP12510690U JP12510690U JPH0485835U JP H0485835 U JPH0485835 U JP H0485835U JP 12510690 U JP12510690 U JP 12510690U JP 12510690 U JP12510690 U JP 12510690U JP H0485835 U JPH0485835 U JP H0485835U
- Authority
- JP
- Japan
- Prior art keywords
- audio signal
- output
- noise
- transmitter
- detector
- 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
- 230000005236 sound signal Effects 0.000 claims 4
- 230000003321 amplification Effects 0.000 claims 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 1
Landscapes
- Control Of Amplification And Gain Control (AREA)
- Transmitters (AREA)
Description
第１図は本考案の実施例を示すブロツク図、第
２図は本考案の詳細回路図、第３図は本考案の回
路の入出力特性図である。
１……防騒音形マイクロフオン、２……増幅器
、３……検出回路、４……制御回路、５……利得
可変増幅器。
FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a detailed circuit diagram of the present invention, and FIG. 3 is an input/output characteristic diagram of the circuit of the present invention. DESCRIPTION OF SYMBOLS 1...Noiseproof microphone, 2...Amplifier, 3...Detection circuit, 4...Control circuit, 5...Variable gain amplifier.
Claims (1)
度を変えて所望の音声信号出力を得る利得可変増
幅器と、 前記防騒音形送話器の出力音声信号を整流して
得られる直流電圧を周囲雑音と比較して決められ
る所定の基準電圧と比較し該直流電圧が基準電圧
を超えたとき音声信号有りを示す出力を得る検出
器と、 該検出器の出力が存在する時間だけ前記利得可
変増幅器の増幅度を定められた値だけ上げるよう
な前記制御信号を出力する制御回路と を備えた送話器回路。[Claims for Utility Model Registration] A noise-proof transmitter; a variable gain amplifier for changing the amplification degree of an audio signal from the transmitter using a control signal to obtain a desired audio signal output; and the noise-proof transmitter. A detector that compares the DC voltage obtained by rectifying the output audio signal of the speaker with a predetermined reference voltage determined by comparing it with ambient noise, and obtains an output indicating the presence of an audio signal when the DC voltage exceeds the reference voltage. and a control circuit that outputs the control signal to increase the amplification degree of the variable gain amplifier by a predetermined value only during the time when the output of the detector is present.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12510690U JPH0485835U (en) | 1990-11-29 | 1990-11-29 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12510690U JPH0485835U (en) | 1990-11-29 | 1990-11-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0485835U true JPH0485835U (en) | 1992-07-27 |
Family
ID=31872725
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12510690U Pending JPH0485835U (en) | 1990-11-29 | 1990-11-29 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0485835U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06268607A (en) * | 1993-03-11 | 1994-09-22 | Nec Corp | Digital potable telephone set |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58115912A (en) * | 1981-12-29 | 1983-07-09 | Mitsubishi Electric Corp | Transmitter |
| JPS6119232A (en) * | 1984-07-05 | 1986-01-28 | Nippon Motoroola Kk | Controller of automatic transmission output power in portable radio equipment |
-
1990
- 1990-11-29 JP JP12510690U patent/JPH0485835U/ja active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58115912A (en) * | 1981-12-29 | 1983-07-09 | Mitsubishi Electric Corp | Transmitter |
| JPS6119232A (en) * | 1984-07-05 | 1986-01-28 | Nippon Motoroola Kk | Controller of automatic transmission output power in portable radio equipment |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06268607A (en) * | 1993-03-11 | 1994-09-22 | Nec Corp | Digital potable telephone set |
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