JPS5931051Y2 - Earphone volume automatic adjustment circuit - Google Patents
Earphone volume automatic adjustment circuitInfo
- Publication number
- JPS5931051Y2 JPS5931051Y2 JP3595478U JP3595478U JPS5931051Y2 JP S5931051 Y2 JPS5931051 Y2 JP S5931051Y2 JP 3595478 U JP3595478 U JP 3595478U JP 3595478 U JP3595478 U JP 3595478U JP S5931051 Y2 JPS5931051 Y2 JP S5931051Y2
- Authority
- JP
- Japan
- Prior art keywords
- earphone
- circuit
- speaker
- changeover switch
- impedance element
- 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.)
- Expired
Links
Landscapes
- Control Of Amplification And Gain Control (AREA)
- Circuits Of Receivers In General (AREA)
Description
【考案の詳細な説明】
本考案は音響機器におけるイヤホーンの音量自動調整回
路に関するものである。[Detailed Description of the Invention] The present invention relates to an automatic volume adjustment circuit for earphones in audio equipment.
更に詳説すると、本考案はポケットタイプラジオ等に於
て、外部よりラジオのスピーカを通して入る騒音の大小
によりイヤホーンの出力をコントロールするものである
。More specifically, the present invention controls the output of an earphone in a pocket type radio or the like depending on the level of noise that enters from the outside through the radio's speaker.
従来使用されているポケットタイプのラジオでは外部の
騒音が大きい場合、イヤホーン出力は音量ボリュームで
しかコントロールできず、そのため騒音レベルの大きさ
に依りいちいちボリュームをコントロールせねばならず
、面倒であった。In conventional pocket-type radios, when external noise is large, the earphone output can only be controlled by the volume, which makes it cumbersome to control the volume each time depending on the noise level.
本考案は斯る欠点を改善し、騒音レベルが変動した場合
も適当なイヤホーン出力が得られるよう自動的にコント
ロールし得るようにしたものである。The present invention improves these drawbacks and enables automatic control to obtain an appropriate earphone output even when the noise level fluctuates.
次に図面と共に本考案について説明する。Next, the present invention will be explained with reference to the drawings.
１はＩＰおよび検波回路、２は音量調整用可変抵抗器、
３は音声低周波増幅回路ＡＭＰ、、４はイヤホーン切換
スイッチＳ、付ソケット、５はスピーカ、Ｒ，、Ｒ２は
音声低周波増幅回路３の入出力間に接続された負帰還Ｎ
ＦＢ用抵抗、６はトランジスタよりなる可変インピーダ
ンス素子、Ｔは増幅器ＡＭＰ２より構成される可変イン
ピーダンス素子６のインピーダンス制御回路、Ｓ２はイ
ヤホーン切換スイッチＳ１と連動して切換わる切換スイ
ッチである。1 is an IP and detection circuit, 2 is a variable resistor for volume adjustment,
3 is an audio low frequency amplification circuit AMP, 4 is a socket with an earphone selector switch S, 5 is a speaker, R, and R2 is a negative feedback N connected between the input and output of the audio low frequency amplification circuit 3.
FB resistor, 6 is a variable impedance element made of a transistor, T is an impedance control circuit for the variable impedance element 6 made of an amplifier AMP2, and S2 is a changeover switch that is switched in conjunction with the earphone changeover switch S1.
さて、イヤホーン（図示せず）を使用しない図示の回路
の場合にはスピーカ５より音が出ており、ＡＭＰ、３は
トランジスタ６がＯＦＦであるためＲ１゜Ｒ２よりなる
ＮＦＢ回路にてＮ、Ｆ、 Ｂがかかり、ＡＭＰ、３は所
定の利得を得る。Now, in the case of the illustrated circuit that does not use earphones (not shown), sound is emitted from the speaker 5, and since the transistor 6 of AMP, 3 is OFF, the NFB circuit consisting of R1 and R2 is connected to N, F. , B, and AMP, 3 obtains a predetermined gain.
次に、イヤホーンをさし込んだ場合スイッチＳ１．Ｓ２
は切換ってＥ、Ｐ、の位置となり、ＳｌにてＡＭＰ３の
出力はイヤホーンのみに出力され、一方スピーカ５はマ
イクの役目を行い、機器周辺の騒音を取出す。Next, when you insert the earphones, switch S1. S2
is switched to positions E and P, and the output of AMP3 is outputted only to the earphone at Sl, while the speaker 5 acts as a microphone and extracts noise around the device.
騒音入力信号はＳ２を通って適当なレベルまでノイズア
ンプＡＭＰ２γによって増巾された後、トランジスタ６
を動作させ、ＮＦＢ回の一部（Ａ点）を側路してＮＦＢ
回を減少させるべくＮＦＢ回路をコントロールし、ＮＦ
Ｂの効果を下げる。After the noise input signal passes through S2 and is amplified to an appropriate level by the noise amplifier AMP2γ, it is transferred to the transistor 6.
, bypass a part of the NFB times (point A) and perform the NFB
The NFB circuit is controlled to reduce the number of NF
Reduces the effect of B.
その結果、イヤホーン使用時の出力を上げることになり
、外部騒音のレベルに応じてイヤホーンの音量が自動的
に制御される。As a result, the output when using the earphones is increased, and the volume of the earphones is automatically controlled according to the level of external noise.
伺、可変インピーダンス素子６は負帰還用抵抗Ｒ１或は
Ｒ２と並列に接続して帰還路のインピーダンスを可変す
るようにしても上述と同様の動作を行なわせることもで
きる。However, the variable impedance element 6 may be connected in parallel with the negative feedback resistor R1 or R2 to vary the impedance of the feedback path to perform the same operation as described above.
このように本考案はイヤホーン使用時に音量調整器の位
置に関係なくイヤホン出力を外部騒音の大きさにより自
動的に調整できるので、極めて便利である。As described above, the present invention is very convenient because the earphone output can be automatically adjusted according to the level of external noise regardless of the position of the volume adjuster when using earphones.
図面は本考案のイヤホーンの音量自動調整回路を示す回
路図である。
３・・・・・・音声低周波増幅回路、４・・・・・・イ
ヤホーン切換スイッチ付ソケット、５・・・・・・スピ
ーカ、６・・・・・・可変インピーダンス素子、Ｔ・・
・・・・インピーダンス制御回路、Ｓ４．Ｓ２・・・・
・・切換スイッチ。The drawing is a circuit diagram showing an automatic volume adjustment circuit of an earphone according to the present invention. 3...Audio low frequency amplification circuit, 4...Socket with earphone selector switch, 5...Speaker, 6...Variable impedance element, T...
... Impedance control circuit, S4. S2...
...Choice switch.
Claims (1)
接続されるイヤホーン切換スイッチ付ソケットとを備え
る音響機器において、前記音声低周波回路の入出力間に
ＮＦＢ回路を接続し、該ＮＦＢ回路と接地間或いは該Ｎ
ＦＢ回路と並列に可変インピーダンス素子を接続し、前
記イヤホーン切換スイッチ付ソケットにイヤホーンを挿
入接続する際、該イヤホーン切換スイッチと連動して切
換わる切換スイッチを介して前記可変インピーダンス素
子のインピーダンス制御回路と前記スピーカを接続し、
イヤホーン動作時にスピーカへの入力外部雑音レベルに
応じて前記可変インピーダンス素子を制御することによ
りイヤホーンの音量を外部雑音に応じて制御することを
特徴とするイヤホーンの音量自動調整回路。In an audio device comprising an audio low frequency amplification circuit and a socket with an earphone changeover switch connected between the output side of the circuit and a speaker, an NFB circuit is connected between the input and output of the audio low frequency circuit, and the NFB circuit and the ground or the N
A variable impedance element is connected in parallel with the FB circuit, and when an earphone is inserted and connected to the socket with the earphone changeover switch, the impedance control circuit of the variable impedance element is connected via a changeover switch that is switched in conjunction with the earphone changeover switch. Connect the speaker,
An automatic volume adjustment circuit for an earphone, characterized in that the volume of the earphone is controlled according to external noise by controlling the variable impedance element according to the external noise level input to the speaker when the earphone is operated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3595478U JPS5931051Y2 (en) | 1978-03-17 | 1978-03-17 | Earphone volume automatic adjustment circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3595478U JPS5931051Y2 (en) | 1978-03-17 | 1978-03-17 | Earphone volume automatic adjustment circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS54137342U JPS54137342U (en) | 1979-09-22 |
| JPS5931051Y2 true JPS5931051Y2 (en) | 1984-09-04 |
Family
ID=28896206
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3595478U Expired JPS5931051Y2 (en) | 1978-03-17 | 1978-03-17 | Earphone volume automatic adjustment circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5931051Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1991011077A1 (en) * | 1990-01-19 | 1991-07-25 | Matsushita Electric Industrial Co., Ltd. | Sound reproducing device |
-
1978
- 1978-03-17 JP JP3595478U patent/JPS5931051Y2/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1991011077A1 (en) * | 1990-01-19 | 1991-07-25 | Matsushita Electric Industrial Co., Ltd. | Sound reproducing device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS54137342U (en) | 1979-09-22 |
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