JPH0326665Y2 - - Google Patents
Info
- Publication number
- JPH0326665Y2 JPH0326665Y2 JP1984189009U JP18900984U JPH0326665Y2 JP H0326665 Y2 JPH0326665 Y2 JP H0326665Y2 JP 1984189009 U JP1984189009 U JP 1984189009U JP 18900984 U JP18900984 U JP 18900984U JP H0326665 Y2 JPH0326665 Y2 JP H0326665Y2
- Authority
- JP
- Japan
- Prior art keywords
- power supply
- power
- supply line
- voltage
- amplifier
- 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
- 239000003990 capacitor Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
Landscapes
- Amplifiers (AREA)
Description
【考案の詳細な説明】
(イ) 産業上の利用分野
本考案は雑音低減回路に関するものであり、殊
に電源遮断時に発生するポツプノイズ等の雑音を
低減する回路に関するものである。[Detailed description of the invention] (a) Field of industrial application The present invention relates to a noise reduction circuit, and in particular to a circuit that reduces noise such as pop noise generated when power is cut off.
(ロ) 従来の技術
従来、電源遮断時に発生するポツプノイズ等の
雑音を低減する回路は公知である（例えば実開昭
57−98012号公報）。(b) Conventional technology Conventionally, circuits that reduce pop noises and other noises that occur when the power is cut off are well known (for example, the
57-98012).
斯る従来回路の一例を第２図に示す。 An example of such a conventional circuit is shown in FIG.
第２図において、１は電源、２はテープレコー
ダ部、３はテープレコーダ部２の電源スイツチ、
４は例えばDC−DCコンバータ等の電源供給部、
５は電源供給部４より電源電圧が供給される前置
増幅及び電力増幅器、６はグラフイツクイコライ
ザ等の音響機器である。 In FIG. 2, 1 is a power supply, 2 is a tape recorder section, 3 is a power switch for the tape recorder section 2,
4 is a power supply unit such as a DC-DC converter,
Reference numeral 5 represents a preamplifier and power amplifier to which power supply voltage is supplied from the power supply section 4, and 6 represents audio equipment such as a graphic equalizer.
次に、動作について説明する。 Next, the operation will be explained.
電源スイツチ３が閉成されている場合には、電
源１からの電源電圧が電源供給線路７を介してテ
ープレコーダ部２に印加され、また電源供給線路
８を介して電源供給部４に印加され、テープレコ
ーダ部２及び電源供給部４が能動状態となつてい
る。 When the power switch 3 is closed, the power supply voltage from the power supply 1 is applied to the tape recorder unit 2 via the power supply line 7 and to the power supply unit 4 via the power supply line 8. , the tape recorder section 2 and the power supply section 4 are in an active state.
従つて、電源供給部４からの電源電圧が前置増
幅及び電力増幅器５に印加され、前置増幅及び電
力増幅器５も能動状態となつている。また、電源
供給線路８に電源電圧が存在する時にはトランジ
スタ９がONとなつている為、トランジスタ１０
がONとなり、電源１からの電圧がトランジスタ
１０・ダイオード１１，１２を介して音響機器６
に印加されている。 Therefore, the power supply voltage from the power supply 4 is applied to the preamplifier and power amplifier 5, and the preamplifier and power amplifier 5 is also in an active state. Also, when the power supply voltage is present on the power supply line 8, the transistor 9 is turned on, so the transistor 10
turns ON, and the voltage from power supply 1 is applied to audio equipment 6 via transistor 10 and diodes 11 and 12.
is applied to.
斯る状態より電源スイツチ３を開放し、電源を
遮断すると電源供給部４への電源供給が遮断さ
れ、電源供給部４からの前置増幅及び電力増幅器
５への電源供給も遮断される。 In this state, when the power switch 3 is opened and the power is cut off, the power supply to the power supply section 4 is cut off, and the power supply from the power supply section 4 to the preamplifier and the power amplifier 5 is also cut off.
一方、トランジスタ９はコンデンサ１３と抵抗
１４よりなる時定数回路１５にて定まる時間ON
状態を継続する為、音響機器６へは電源スイツチ
３開放後も所定時間は電源が供給される。 On the other hand, the transistor 9 is turned ON for a period determined by a time constant circuit 15 consisting of a capacitor 13 and a resistor 14.
In order to continue the state, power is supplied to the audio equipment 6 for a predetermined time even after the power switch 3 is released.
斯様に電源遮断時増幅器５への電源供給を直ち
に停止させ、然る後音響機器６への電源供給を断
つことにより雑音の発生を防止するようにしてい
る。 In this way, when the power is cut off, the power supply to the amplifier 5 is immediately stopped, and then the power supply to the audio equipment 6 is cut off, thereby preventing the generation of noise.
(ハ) 考案が解決しようとする問題点
通常、電源供給部４からの電源供給線路１６に
は大容量平滑用コンデンサ１７が接続されてお
り、斯るコンデンサ１７の充電電圧により電源供
給部４からの電源供給が断たれた後も増幅器５は
所定期間（即ち、コンデンサの充電電圧が放電さ
れる期間）能動状態にある。(c) Problems to be solved by the invention Usually, a large-capacity smoothing capacitor 17 is connected to the power supply line 16 from the power supply section 4, and the charging voltage of the capacitor 17 causes the voltage from the power supply section 4 to Even after the power supply to the amplifier 5 is cut off, the amplifier 5 remains active for a predetermined period (i.e., a period during which the charging voltage of the capacitor is discharged).
即ち、音声出力が出ていなければ増幅器はコン
デンサに充電されている電圧を消費して短時間に
動作を停止するが、電源遮断時には残留ノイズの
みとなり動作停止までに時間を要する。 That is, if there is no audio output, the amplifier consumes the voltage charged in the capacitor and stops operating in a short time, but when the power is cut off, only residual noise is produced and it takes a long time for the amplifier to stop operating.
従つて、時定数回路１５にて設定された時間経
過後、トランジスタ１０がOFFとなり音響機器
６への電源が断たれた時、斯る電源遮断による電
圧変動が増幅器５を介してスピーカ１８よりポツ
プノイズとして放音されてしまうという問題を依
然として生じるものであつた。 Therefore, after the time set by the time constant circuit 15 has elapsed, when the transistor 10 is turned off and the power to the audio equipment 6 is cut off, the voltage fluctuation caused by the power cut-off is transmitted through the amplifier 5 to the speaker 18 as a pop noise. This still caused the problem that the sound was emitted as a
また、斯る問題は時定数を多少増しても効果が
なく、時定数を長くするものも実用上問題とな
る。 In addition, even if the time constant is slightly increased, it is not effective to solve this problem, and increasing the time constant also poses a problem in practice.
(ニ) 問題点を解決するための手段
本考案は、電源スイツチを介して電源が供給さ
れる増幅器と、スイツチング素子が配置された第
１電源供給線路と、電圧降下手段が配置された第
２電源供給線路と、この第１及び第２電源供給線
路を介して電源が供給される音響機器と、前記電
源スイツチの操作に基づき前記スイツチング素子
を制御する制御手段とを設けた。(d) Means for solving the problem The present invention consists of an amplifier to which power is supplied via a power switch, a first power supply line in which a switching element is disposed, and a second power supply line in which a voltage drop means is disposed. A power supply line, an audio device to which power is supplied via the first and second power supply lines, and a control means for controlling the switching element based on the operation of the power switch are provided.
(ホ) 作 用
上記の構成において、電源スイツチが閉成され
ている場合には、制御手段にてスイツチング素子
を駆動することにより音響機器へ第１電源供給線
路を介して電源を供給するように作用し、
電源スイツチが開放された場合には、音響機器
へ第２電源供給線路を介して電圧降下手段にて所
定電圧降下された電圧を供給し、この電圧降下に
基づく音響機器からの雑音出力を増幅器に印加す
ることにより増幅器に印加される残留直流電圧を
消費するよう作用する。(E) Operation In the above configuration, when the power switch is closed, the control means drives the switching element to supply power to the audio equipment via the first power supply line. When the power switch is opened, a voltage dropped by a predetermined voltage by the voltage drop means is supplied to the audio equipment via the second power supply line, and noise output from the audio equipment based on this voltage drop is generated. By applying this to the amplifier, it acts to consume the residual DC voltage applied to the amplifier.
(ヘ) 実施例
第１図は本考案の一実施例を示す図である。尚
第２図と同一部分には同一図番を附すと共にその
説明を省略する。(F) Embodiment FIG. 1 is a diagram showing an embodiment of the present invention. The same parts as in FIG. 2 are given the same reference numbers and their explanations are omitted.
第１図において、２０はスイツチングトランジ
スタ２１が配置された第１電源供給線路、２２は
スイチングトランジスタ２１を制御する制御トラ
ンジスタ、２３はトランジスタ１０及びダイオー
ド１１，１２が配置された第２電源供給線路であ
る。 In FIG. 1, 20 is a first power supply line in which a switching transistor 21 is arranged, 22 is a control transistor that controls the switching transistor 21, and 23 is a second power supply line in which a transistor 10 and diodes 11 and 12 are arranged. It's a railroad.
次に、動作について説明する。 Next, the operation will be explained.
電源スイツチ３が閉成されている場合には、電
源１からの電源電圧が電源供給線路７を介してテ
ープレコーダ部２に印加され、また電源供給線路
８を介して電源供給部４に印加され、テープレコ
ーダ部２及び電源供給部４が能動状態となつてい
る。 When the power switch 3 is closed, the power supply voltage from the power supply 1 is applied to the tape recorder unit 2 via the power supply line 7 and to the power supply unit 4 via the power supply line 8. , the tape recorder section 2 and the power supply section 4 are in an active state.
従つて、電源供給部４からの電源電圧が前置増
幅及び電力増幅器５に印加され、前置増幅及び電
力増幅器５も能動状態となつている。 Therefore, the power supply voltage from the power supply 4 is applied to the preamplifier and power amplifier 5, and the preamplifier and power amplifier 5 is also in an active state.
また、電源供給線路８からの電源電圧によりト
ランジスタ９，２２がON状態にある為、トラン
ジスタ１０，２１はONとなつている。 Furthermore, since the transistors 9 and 22 are in the ON state due to the power supply voltage from the power supply line 8, the transistors 10 and 21 are in the ON state.
従つて、第１及び第２電源供給線路２０，２３
は共に閉成されるが、電源１からの電圧は第１電
源供給線路２０を介して音響機器６へ印加され
る。 Therefore, the first and second power supply lines 20, 23
are both closed, but the voltage from the power supply 1 is applied to the audio equipment 6 via the first power supply line 20.
斯る状態より電源スイツチ３を開放し、電源を
遮断すると、電源供給部４への電源供給が遮断さ
れ、電源供給部４からの前置増幅及び電力増幅器
５への電源供給も遮断される。 When the power switch 3 is opened in such a state to cut off the power, the power supply to the power supply section 4 is cut off, and the power supply from the power supply section 4 to the preamplifier and power amplifier 5 is also cut off.
従つて、トランジスタ２２のベース電位が低下
し、OFFとなる為、トランジスタ２１もOFFと
なる。即ち、第１電源供給線路２０は開放され
る。 Therefore, the base potential of the transistor 22 decreases and is turned off, so that the transistor 21 is also turned off. That is, the first power supply line 20 is opened.
一方、トランジスタ９はコンデンサ１３と抵抗
１４よりなる時定数回路１５にて定まる時間ON
状態を継続する為、音響機器６へは第２電源供給
線路２３を介してダイオード１１，１２にて電圧
降下された電圧が印加される。 On the other hand, the transistor 9 is turned ON for a period determined by a time constant circuit 15 consisting of a capacitor 13 and a resistor 14.
In order to continue the state, a voltage dropped by the diodes 11 and 12 is applied to the audio equipment 6 via the second power supply line 23.
従つて、音響機器６からは斯る電圧変動に基づ
く雑音出力が出力され、斯る雑音出力を増幅器５
に印加することによりコンデンサ１７に充電され
ている残留直流電圧を急速に放電し、以つて増幅
器５を急速停止させ、然る後音響機器６の電源を
断つようにしている。 斯様にして音響機器６の
電源遮断に基づく雑音の発生を防止することが出
来る。 Therefore, the audio equipment 6 outputs a noise output based on such voltage fluctuations, and the noise output is sent to the amplifier 5.
By applying this voltage, the residual DC voltage charged in the capacitor 17 is rapidly discharged, the amplifier 5 is quickly stopped, and the power to the audio equipment 6 is then cut off. In this way, it is possible to prevent the generation of noise due to power cutoff of the audio equipment 6.
尚、ダイオードによる降下電圧は小さい為、斯
る電圧降下による雑音も小レベル（耳につかない
程度のもの）である。 Note that since the voltage drop caused by the diode is small, the noise caused by this voltage drop is also at a small level (inaudible).
(ト) 考案の効果
本考案に依れば、音響機器への電源供給を電源
スイツチが閉成されている場合には第１電源供給
線路にて達成し、電源スイツチが開放された場合
には、電圧降下手段を有する第２電源供給線路に
て達成することにより、電源遮断時電圧降下に基
づく音響機器からの雑音出力を増幅器に印加する
ことにより増幅器に印加される残留直流電圧を消
費するようにしたので、増幅器の動作を音響機器
の電源遮断以前に確実に停止させ、音響機器の電
源遮断に基づく雑音の発生を防止することが出来
る。(g) Effect of the invention According to the invention, when the power switch is closed, the power supply to the audio equipment is achieved through the first power supply line, and when the power switch is opened, the power supply to the audio equipment is achieved through the first power supply line. By achieving this with the second power supply line having a voltage drop means, the noise output from the audio equipment based on the voltage drop when the power is cut off is applied to the amplifier, thereby consuming the residual DC voltage applied to the amplifier. Therefore, the operation of the amplifier can be reliably stopped before the power to the audio equipment is cut off, and the generation of noise due to the power cut off to the audio equipment can be prevented.
第１図は本考案の一実施例を示す図、第２図は
従来例を示す図である。
１…電源、３…電源スイツチ、５…前置増幅及
び電力増幅器、６…音響機器、２０…第１電源供
給線路、２１…スイツチングトランジスタ、２２
…制御トランジスタ、２３…第２電源供給線路。
FIG. 1 is a diagram showing an embodiment of the present invention, and FIG. 2 is a diagram showing a conventional example. DESCRIPTION OF SYMBOLS 1... Power supply, 3... Power switch, 5... Preamplifier and power amplifier, 6... Audio equipment, 20... First power supply line, 21... Switching transistor, 22
...Control transistor, 23...Second power supply line.
Claims (1)
と、スイツチング素子が配置された第１電源供給
線路と、電圧降下手段が配置された第２電源供給
線路と、この第１及び第２電源供給線路を介して
電源が供給される音響機器と、前記電源スイツチ
の操作に基づき前記スイツチング素子を制御する
制御手段とを備え、 前記電源スイツチが閉成されている際には、前
記制御手段にて前記スイツチング素子を駆動する
ことにより前記音響機器へ前記第１電源供給線路
を介して電源を供給するようになし、電源スイツ
チが開放された際には、前記制御手段にて前記ス
イツチング素子を不動作にして前記音響機器へ前
記第２電源供給線路を介して前記電圧降下手段に
て所定電圧降下された電圧を供給し、この電圧降
下に基づく前記音響機器からの雑音出力を前記増
幅器に印加することにより前記増幅器の残留直流
電圧を消費し、以つて電源遮断時の雑音を低減す
るようにしたことを特徴とする雑音低減回路。[Claims for Utility Model Registration] An amplifier to which power is supplied via a power switch, a first power supply line in which a switching element is disposed, a second power supply line in which a voltage drop means is disposed, and the second power supply line in which a voltage drop means is disposed. an audio device to which power is supplied via first and second power supply lines, and a control means for controlling the switching element based on the operation of the power switch, and when the power switch is closed, The control means drives the switching element to supply power to the audio equipment via the first power supply line, and when the power switch is opened, the control means drives the switching element. The switching element is made inoperative, and a voltage dropped by a predetermined voltage by the voltage drop means is supplied to the audio equipment via the second power supply line, and noise output from the audio equipment based on this voltage drop is caused. A noise reduction circuit characterized in that the residual DC voltage of the amplifier is consumed by applying it to the amplifier, thereby reducing noise when power is cut off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1984189009U JPH0326665Y2 (en) | 1984-12-13 | 1984-12-13 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1984189009U JPH0326665Y2 (en) | 1984-12-13 | 1984-12-13 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61104622U JPS61104622U (en) | 1986-07-03 |
| JPH0326665Y2 true JPH0326665Y2 (en) | 1991-06-10 |
Family
ID=30746469
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1984189009U Expired JPH0326665Y2 (en) | 1984-12-13 | 1984-12-13 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0326665Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5157801B2 (en) * | 2008-10-03 | 2013-03-06 | 船井電機株式会社 | Speaker device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58210703A (en) * | 1982-06-01 | 1983-12-08 | Sanyo Electric Co Ltd | Shock sound preventing circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59132214U (en) * | 1983-02-22 | 1984-09-05 | 株式会社ケンウッド | power control circuit |
-
1984
- 1984-12-13 JP JP1984189009U patent/JPH0326665Y2/ja not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58210703A (en) * | 1982-06-01 | 1983-12-08 | Sanyo Electric Co Ltd | Shock sound preventing circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61104622U (en) | 1986-07-03 |
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