JPH1175287A - Audio equipment - Google Patents
Audio equipmentInfo
- Publication number
- JPH1175287A JPH1175287A JP24945897A JP24945897A JPH1175287A JP H1175287 A JPH1175287 A JP H1175287A JP 24945897 A JP24945897 A JP 24945897A JP 24945897 A JP24945897 A JP 24945897A JP H1175287 A JPH1175287 A JP H1175287A
- Authority
- JP
- Japan
- Prior art keywords
- capacitor
- power
- power supply
- power amplifier
- resistor
- 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.)
- Granted
Links
Landscapes
- Circuit For Audible Band Transducer (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、音信号を電力増幅
器で増幅してスピーカから出力する音響装置の改善に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an acoustic device for amplifying a sound signal by a power amplifier and outputting the amplified sound signal from a speaker.
【０００２】[0002]
【従来の技術】従来、音信号を電力増幅器で増幅してス
ピーカから出力する音響装置は、図５〜図６に示すよう
なものであった。即ち、音響装置２１は直流電源Ｅと、
電源スイッチＳＷと、電力増幅器ＡＭＰと、カップリン
グコンデンサＣｃと、スピーカＳＰとで構成されてい
た。2. Description of the Related Art Conventionally, an audio apparatus for amplifying a sound signal by a power amplifier and outputting the amplified signal from a speaker is as shown in FIGS. That is, the acoustic device 21 includes a DC power source E,
It consisted of a power switch SW, a power amplifier AMP, a coupling capacitor Cc, and a speaker SP.
【０００３】電源スイッチＳＷをオンすると、電力増幅
器ＡＭＰに電力増幅器電源Ｅ１が供給され、音信号が電
力増幅器ＡＭＰで増幅され、カップリングコンデンサＣ
ｃを介してスピーカＳＰから出力される。When the power switch SW is turned on, the power amplifier power E1 is supplied to the power amplifier AMP, the sound signal is amplified by the power amplifier AMP, and the coupling capacitor C
Output from the speaker SP via c.
【０００４】[0004]
【発明が解決しようとする課題】しかしながらこの音響
装置２１は、電源スイッチＳＷをオン・オフして電力増
幅器用電源Ｅ１をオン・オフする際に、カップリングコ
ンデンサＣｃの充放電電流により、過渡的にスピーカＳ
Ｐに過渡電流が流れ、この過渡電流によりスピーカＳＰ
に雑音が発生していた。However, when the power switch SW is turned on and off to turn on and off the power amplifier power supply E1, the acoustic device 21 is transiently charged and discharged by the coupling capacitor Cc. Speaker S
P causes a transient current to flow through the speaker SP
There was noise.
【０００５】[0005]
【課題を解決するための手段】上記従来の音響装置の問
題点に鑑み、本発明の目的は、電源スイッチをオン・オ
フして電力増幅器用電源をオン・オフする際に電力増幅
器に接続されたスピーカに雑音を発生させることがない
音響装置を提供するもので、音信号を電力増幅器で増幅
してスピーカから出力する音響装置において、前記スピ
ーカに音声電流を出力するための前記電力増幅器の前記
電源オン時に該電源により抵抗を介してコンデンサを徐
々に充電し、前記電源オフ時にダイオードにより前記コ
ンデンサの電荷を電源側に急速に放電する第一の積分回
路と、前記電源オン時に前記電源よりダイオードを介し
てコンデンサを急速に充電し、前記電源オフ時に抵抗に
よりコンデンサの電荷を接地側に徐々に放電する第二の
積分回路と、前記第一の積分回路及び第二の積分回路の
コンデンサ両端電圧を比較し、第一の積分回路のコンデ
ンサ両端電圧が前記第二の積分回路のコンデンサ両端電
圧よりも大きい場合に、前記電力増幅器と前記スピーカ
間のスイッチを閉とする信号を出力する電圧比較器とで
構成したミューティング装置を具備することである。SUMMARY OF THE INVENTION In view of the above-mentioned problems of the conventional audio apparatus, an object of the present invention is to connect a power amplifier to a power amplifier when turning on / off a power switch to turn on / off the power supply for the power amplifier. The present invention provides an acoustic device that does not generate noise in a speaker, and in an acoustic device that amplifies a sound signal with a power amplifier and outputs the sound signal from the speaker, wherein the power amplifier for outputting a sound current to the speaker. A first integrating circuit that gradually charges a capacitor via a resistor by the power supply when the power is on, and rapidly discharges the charge of the capacitor to the power supply side by a diode when the power is off; a diode from the power supply when the power is on; A second integrating circuit that rapidly charges the capacitor via the resistor and gradually discharges the charge of the capacitor to the ground side by a resistor when the power is turned off; Comparing the voltage between both ends of the capacitors of the one integration circuit and the second integration circuit, and when the voltage between both ends of the capacitor of the first integration circuit is larger than the voltage between both ends of the capacitor of the second integration circuit, the power amplifier and the speaker And a voltage comparator for outputting a signal for closing a switch between the muting devices.
【０００６】[0006]
【発明の実施の形態】電力増幅器用電源がオンの時、電
源スイッチをオンして一定時間経過後にスピーカが電力
増幅器に接続されるため、電源オン時の雑音がない。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS When a power supply for a power amplifier is on, a speaker is connected to the power amplifier after a lapse of a predetermined time after a power switch is turned on, so that there is no noise when the power supply is turned on.
【０００７】また、電力増幅器用電源がオフの時、電源
スイッチをオフして一定時間経過後にスピーカが電力増
幅器から切り離されるため、電源オフ時の雑音がない。Further, when the power supply for the power amplifier is off, the speaker is disconnected from the power amplifier after a lapse of a predetermined time after the power switch is turned off, so that there is no noise when the power supply is off.
【０００８】[0008]
【実施例】本発明に係る音響装置の一実施例を図１〜図
４に示す。以下これらの図面に基づいて本発明を説明す
る。1 to 4 show an embodiment of an acoustic device according to the present invention. Hereinafter, the present invention will be described with reference to these drawings.
【０００９】音響装置１は直流電源Ｅと、電源スイッチ
ＳＷと、電力増幅器ＡＭＰと、カップリングコンデンサ
Ｃｃと、カップリングコンデンサ充電用抵抗ｒと、リレ
ーＲｙと、スピーカＳＰとで構成され、この音響装置
は、電力増幅器用電源Ｅ１と、制御用電源Ｅ２と、抵抗
Ｒ１，ダイオードＤ１，コンデンサＣ１から成る第一の
積分回路と、抵抗Ｒ２，ダイオードＤ２，コンデンサＣ
２から成る第二の積分回路と、電圧比較器ＣＰと、トラ
ンジスタＱと、リレーＲｙと、抵抗ＲｂとダイオードＤ
ｂはＶ２の電位を接地より約０．６Ｖ以上に保つバイア
ス回路とで構成されるミューティング装置２に接続され
る。The acoustic device 1 comprises a DC power source E, a power switch SW, a power amplifier AMP, a coupling capacitor Cc, a coupling capacitor charging resistor r, a relay Ry, and a speaker SP. The device comprises a power amplifier power supply E1, a control power supply E2, a first integrating circuit comprising a resistor R1, a diode D1 and a capacitor C1, a resistor R2, a diode D2 and a capacitor C1.
2, a voltage comparator CP, a transistor Q, a relay Ry, a resistor Rb, and a diode D.
b is connected to a muting device 2 comprising a bias circuit for maintaining the potential of V2 at about 0.6 V or more above ground.
【００１０】電力増幅器用電源Ｅ１がオンの時、コンデ
ンサＣ２の電荷はダイオードＤ２により急速充電される
ため、Ｖ２の波形は電力増幅器用電源Ｅ１の波形と同様
で０．６Ｖ低い。一方、コンデンサＣ１の電荷は抵抗Ｒ
１を介して充電されるため、Ｖ１は時定数Ｃ１Ｒ１で徐
々に高くなり、やがてＶ２よりも高くなり、最終的には
Ｖ１＝Ｅ１となる。Ｖ１＞Ｖ２となった瞬間に電圧比較
器ＣＰの出力がＨになり、これに伴いトランジスタＱが
オンし、リレーＲｙの接点が閉じ、電源スイッチＳＷを
オンしてｔ1 秒経過後にスピーカＳＰが電力増幅器ＡＭ
Ｐに接続される。ｔ1 を電力増幅器用電源Ｅ１オン時の
過渡電流がカップリングコンデンサＣｃとカップリング
コンデンサ充電用抵抗ｒを介して流れ終わる時間以上に
選ぶことにより、電源スイッチＳＷをオン時の雑音の発
生をなくすことができる。When the power amplifier power supply E1 is on, the charge of the capacitor C2 is rapidly charged by the diode D2, so that the waveform of V2 is 0.6 V lower than the waveform of the power amplifier power supply E1. On the other hand, the electric charge of the capacitor C1 is equal to the resistance R
Since the battery is charged through 1, V1 gradually increases with the time constant C1R1, and eventually becomes higher than V2, and finally, V1 = E1. V1> output V2 and becomes instantaneous voltage comparator CP becomes H, this with the transistor Q is turned on, closes the contacts of the relay Ry is, the speaker SP after t 1 seconds elapsed after power switch SW is Power amplifier AM
Connected to P. By choosing t 1 over time transient current when the power E1-on power amplifier finishes flows through the coupling capacitor Cc and the coupling capacitor charging resistor r, eliminating noise generation during turn on the power switch SW be able to.
【００１１】電力増幅器用電源Ｅ１がオフの時、コンデ
ンサＣ１の電荷はダイオードＤ１により急速放電される
ため、Ｖ１の波形は電力増幅器用電源Ｅ１の波形と同様
で０．６Ｖ高い。但し抵抗Ｒ１によっても電源側に放電
されるためＶ１は時間経過とともに０Ｖに近づく。一
方、コンデンサＣ２の電荷は抵抗Ｒ２、ダイオードＤ２
を介して時定数Ｃ２Ｒ２で放電されるため、Ｖ２は徐々
に０．６Ｖに近づく。Ｖ１＞Ｖ２となった瞬間に電圧比
較器ＣＰの出力がＬになり、これに伴いトランジスタＱ
がオフし、リレーＲｙの接点が開き、電源スイッチＳＷ
をオフしてｔ2 秒経過後にスピーカＳＰが電力増幅器Ａ
ＭＰから切り離される。ｔ2 を電力増幅器用電源Ｅ１オ
フ時の過渡電流がスピーカＳＰに流れ始める時間以下に
選ぶことにより、電源スイッチＳＷをオフ時の雑音の発
生をなくすことができる。When the power amplifier power supply E1 is off, the electric charge of the capacitor C1 is rapidly discharged by the diode D1, so that the waveform of V1 is 0.6V higher than the waveform of the power amplifier power supply E1. However, since the voltage is also discharged to the power supply side by the resistor R1, V1 approaches 0V with the passage of time. On the other hand, the electric charge of the capacitor C2 is represented by a resistor R2 and a diode D2.
Is discharged with a time constant C2R2 through V2, so that V2 gradually approaches 0.6V. At the moment when V1> V2, the output of the voltage comparator CP becomes L, and accordingly, the transistor Q
Turns off, the contact of the relay Ry opens, and the power switch SW
Is turned off, and after t 2 seconds elapses, the speaker SP
Disconnected from MP. By choosing t 2 below time transients during the power amplifier power supply E1-off starts flowing to the speaker SP, it is possible to eliminate the occurrence of noise at the time of turning off the power switch SW.
【００１２】[0012]
【発明の効果】以上のように本発明に係る音響装置は、
音信号を電力増幅器で増幅してスピーカから出力する音
響装置において、前記スピーカに音声電流を出力するた
めの前記電力増幅器の前記電源オン時に該電源により抵
抗を介してコンデンサを徐々に充電し、前記電源オフ時
にダイオードにより前記コンデンサの電荷を電源側に急
速に放電する第一の積分回路と、前記電源オン時に前記
電源よりダイオードを介してコンデンサを急速に充電
し、前記電源オフ時に抵抗によりコンデンサの電荷を接
地側に徐々に放電する第二の積分回路と、前記第一の積
分回路及び第二の積分回路のコンデンサ両端電圧を比較
し、第一の積分回路のコンデンサ両端電圧が前記第二の
積分回路のコンデンサ両端電圧よりも大きい場合に、前
記電力増幅器と前記スピーカ間のスイッチを閉とする信
号を出力する電圧比較器とで構成したミューティング装
置を具備することによって、電源スイッチをオン・オフ
して電力増幅器用電源をオン・オフする際に電力増幅器
に接続されたスピーカに雑音を発生させることがないと
いう効果がある。As described above, the acoustic device according to the present invention has the following features.
In an audio apparatus that amplifies a sound signal with a power amplifier and outputs the sound signal from a speaker, the power amplifier for outputting an audio current to the speaker is gradually charged through a resistor by a resistor when the power of the power amplifier is turned on. A first integrating circuit that rapidly discharges the charge of the capacitor to the power supply side by a diode when the power is off, and a capacitor that is rapidly charged via the diode from the power supply when the power is on, A second integrating circuit that gradually discharges the electric charge to the ground side is compared with the voltage across the capacitors of the first integrating circuit and the second integrating circuit, and the voltage across the capacitor of the first integrating circuit is the second voltage. A voltage ratio that outputs a signal for closing a switch between the power amplifier and the speaker when the voltage is higher than the voltage across the capacitor of the integrating circuit. That a muting device composed of a power amplifier and a muting device does not generate noise in a speaker connected to the power amplifier when the power switch is turned on and off to turn on and off the power for the power amplifier. There is.
【図１】本発明に係る音響装置の回路図である。FIG. 1 is a circuit diagram of an acoustic device according to the present invention.
【図２】本発明に係る音響装置のミューティング装置の
回路図である。FIG. 2 is a circuit diagram of a muting device of the audio device according to the present invention.
【図３】本発明に係る音響装置の電力増幅器がオン時の
応答特性を示す波形図である。FIG. 3 is a waveform diagram showing response characteristics when the power amplifier of the audio device according to the present invention is turned on.
【図４】本発明に係る音響装置の電力増幅器がオフ時の
応答特性を示す波形図である。FIG. 4 is a waveform chart showing response characteristics when the power amplifier of the audio device according to the present invention is off.
【図５】従来の音響装置の回路図である。FIG. 5 is a circuit diagram of a conventional acoustic device.
【図６】従来の音響装置の応答特性を示す波形図であ
る。FIG. 6 is a waveform chart showing response characteristics of a conventional acoustic device.
１・・・音響装置、２・・・ミューティング装置、Ｅ・
・・直流電源、Ｅ１・・・電力増幅器用電源、Ｅ２・・
・制御用電源、ＡＭＰ・・・電力増幅器、Ｃｃ・・・カ
ップリングコンデンサ、Ｒ１・・・抵抗、Ｄ１・・・ダ
イオード、Ｒ２・・・抵抗、Ｄ２・・・ダイオード、Ｃ
Ｐ・・・電圧比較器、Ｑ・・・トランジスタ、Ｒｙ・・
・リレー、Ｒｂ・・・抵抗、Ｄｂ・・・ダイオード、ｒ
・・・カップリングコンデンサ充電用抵抗。1 ・ ・ ・ Sound device, 2 ・ ・ ・ Muting device, E ・
..DC power supply, E1 power supply for power amplifier, E2
Control power supply, AMP power amplifier, Cc coupling capacitor, R1 resistor, D1 diode, R2 resistor, D2 diode, C
P: voltage comparator, Q: transistor, Ry
・ Relay, Rb ・ ・ ・ Resistance, Db ・ ・ ・ Diode, r
... Charging resistor for coupling capacitor.
Claims (1)
から出力する音響装置において、前記スピーカに音声電
流を出力するための前記電力増幅器の前記電源オン時に
該電源により抵抗を介してコンデンサを徐々に充電し、
前記電源オフ時にダイオードにより前記コンデンサの電
荷を電源側に急速に放電する第一の積分回路と、前記電
源オン時に前記電源よりダイオードを介してコンデンサ
を急速に充電し、前記電源オフ時に抵抗によりコンデン
サの電荷を接地側に徐々に放電する第二の積分回路と、
前記第一の積分回路及び第二の積分回路のコンデンサ両
端電圧を比較し、第一の積分回路のコンデンサ両端電圧
が前記第二の積分回路のコンデンサ両端電圧よりも大き
い場合に、前記電力増幅器と前記スピーカ間のスイッチ
を閉とする信号を出力する電圧比較器とで構成したミュ
ーティング装置を具備することを特徴とする音響装置。1. An audio apparatus for amplifying a sound signal with a power amplifier and outputting the amplified sound signal from a speaker, wherein a capacitor is gradually connected via a resistor by the power supply when the power of the power amplifier for outputting an audio current to the speaker is turned on. To charge,
A first integration circuit that rapidly discharges the charge of the capacitor to the power supply side by a diode when the power supply is turned off, and rapidly charges the capacitor via the diode from the power supply when the power supply is on, and a capacitor by a resistor when the power supply is off. A second integrating circuit that gradually discharges the charge of
Compare the voltage across the capacitor of the first integration circuit and the second integration circuit, if the voltage across the capacitor of the first integration circuit is greater than the voltage across the capacitor of the second integration circuit, the power amplifier and An acoustic device comprising a muting device including a voltage comparator that outputs a signal for closing a switch between the speakers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24945897A JP3297357B2 (en) | 1997-08-28 | 1997-08-28 | Sound equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24945897A JP3297357B2 (en) | 1997-08-28 | 1997-08-28 | Sound equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1175287A true JPH1175287A (en) | 1999-03-16 |
| JP3297357B2 JP3297357B2 (en) | 2002-07-02 |
Family
ID=17193268
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24945897A Expired - Fee Related JP3297357B2 (en) | 1997-08-28 | 1997-08-28 | Sound equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3297357B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100686082B1 (en) * | 2006-03-27 | 2007-02-26 | 엘지전자 주식회사 | Wireless microphone noise prevention device and method |
| KR100767871B1 (en) | 2006-07-11 | 2007-10-17 | 엘지전자 주식회사 | Voice signal processing apparatus and method of wireless microphone system |
| US9143104B2 (en) | 2012-03-16 | 2015-09-22 | Rohm Co., Ltd. | Audio signal processing circuit, car audio apparatus using the same, audio component apparatus, electronic device and output audio signal generating method |
-
1997
- 1997-08-28 JP JP24945897A patent/JP3297357B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100686082B1 (en) * | 2006-03-27 | 2007-02-26 | 엘지전자 주식회사 | Wireless microphone noise prevention device and method |
| KR100767871B1 (en) | 2006-07-11 | 2007-10-17 | 엘지전자 주식회사 | Voice signal processing apparatus and method of wireless microphone system |
| US9143104B2 (en) | 2012-03-16 | 2015-09-22 | Rohm Co., Ltd. | Audio signal processing circuit, car audio apparatus using the same, audio component apparatus, electronic device and output audio signal generating method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3297357B2 (en) | 2002-07-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |