JP2830444B2 - Audio signal amplification circuit - Google Patents
Audio signal amplification circuitInfo
- Publication number
- JP2830444B2 JP2830444B2 JP2260926A JP26092690A JP2830444B2 JP 2830444 B2 JP2830444 B2 JP 2830444B2 JP 2260926 A JP2260926 A JP 2260926A JP 26092690 A JP26092690 A JP 26092690A JP 2830444 B2 JP2830444 B2 JP 2830444B2
- Authority
- JP
- Japan
- Prior art keywords
- low
- frequency
- circuit
- audio signal
- output
- 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 - Fee Related
Links
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、低音域の強調回路を有する音声信号増幅回
路に関するものである。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an audio signal amplifying circuit having a bass enhancement circuit.
従来の技術 従来、低音域の強調回路を有した音声信号増幅回路で
は、その出力をそのままヘッドフォンで聴くと低音がこ
もって聞こえるため、ヘッドフォンが接続されると低音
域の強調回路が働かないようにするスイッチ回路、また
は低音域の強調回路を経由しないヘッドフォン専用の小
出力電力増幅回路を備えているという構成が主流であっ
た。2. Description of the Related Art Conventionally, in an audio signal amplification circuit having a bass enhancement circuit, if the output of the audio signal is directly heard through headphones, the bass will be muffled, so that when the headphones are connected, the bass enhancement circuit does not work. The mainstream configuration includes a switch circuit that performs the operation, or a small output power amplifier circuit dedicated to headphones that does not pass through a bass enhancement circuit.
発明が解決しようとする課題 しかしながら、上記構成の音声信号増幅回路では、信
号経路を切り換えて低音域の強調回路を経由させないよ
うにする回路や、ヘッドフォン専用の電力増幅回路が必
要であり、その分だけ回路構成が複雑になり、高価にな
ってしまうという問題があった。Problems to be Solved by the Invention However, in the audio signal amplifier circuit having the above configuration, a circuit for switching a signal path to prevent the signal from passing through a bass enhancement circuit and a power amplifier circuit dedicated to headphones are necessary, and accordingly, However, there has been a problem that the circuit configuration becomes complicated and the cost increases.
本発明は上記課題を解決するもので、低音域の強調回
路と、低域遮断フィルターとを備えた音声信号増幅回路
を提供することを目的としている。SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide an audio signal amplifying circuit provided with a bass enhancement circuit and a low-frequency cutoff filter.
課題を解決するための手段 本発明は、上記問題点を解決するために、コンデンサ
と抵抗器とから構成された低域遮断フィルターをヘッド
フォン用の減衰器とヘッドフォン用の出力端子との間に
挿入することにより、低音域のカットオフ周波数を高く
し、低音域の増強回路により低音の増加分を等価的にキ
ャンセルさせることを実現するものである。Means for Solving the Problems In order to solve the above problems, the present invention inserts a low-frequency cutoff filter composed of a capacitor and a resistor between an attenuator for headphone and an output terminal for headphone. By doing so, the cutoff frequency in the low range is increased, and the increase in the low range is equivalently canceled by the low range enhancement circuit.
作用 本発明によれば、上記のように、コンデンサとヘッド
フォンの抵抗分を含んだ抵抗とで構成される低域遮断フ
ィルターによって、低音域強調回路による低音の増加分
をキャンセルできるため、信号経路の切り換え回路やヘ
ッドフォン専用の電力増幅回路を用いる必要がなく、安
価にて同等の性能を得ることができる。According to the present invention, as described above, the low-frequency cutoff filter composed of the capacitor and the resistance including the resistance of the headphone can cancel the increase in the low-frequency sound caused by the low-frequency emphasis circuit. There is no need to use a switching circuit or a power amplifier circuit dedicated to headphones, and equivalent performance can be obtained at low cost.
実施例 以下、本発明の実施例を、図面を用いて詳細に説明す
る。Examples Hereinafter, examples of the present invention will be described in detail with reference to the drawings.
第１図は本発明の一実施例である音声信号増幅回路の
回路図である。第１図において、10は入力端子、11は音
量調整用の減衰器、12は低音域強調回路、13は低周波電
力増幅回路、14はヘッドフォン19を接続すると低周波電
力増幅回路13の出力とスピーカ15とが切りはなされる連
動スイッチ付きのヘッドフォン用出力端子、16は低周波
電力増幅回路13の出力をヘッドフォン19の入力に合わす
ための減衰器、17はコンデンサ、18は抵抗器であり、抵
抗器18とヘッドフォン19の抵抗分との合成抵抗とコンデ
ンサ17とで低減遮断フィルターを構成している。FIG. 1 is a circuit diagram of an audio signal amplifier circuit according to one embodiment of the present invention. In FIG. 1, 10 is an input terminal, 11 is an attenuator for adjusting the volume, 12 is a bass enhancement circuit, 13 is a low-frequency power amplifier, and 14 is the output of the low-frequency power amplifier 13 when headphones 19 are connected. An output terminal for a headphone with an interlock switch separated from the speaker 15, an attenuator 16 for matching the output of the low-frequency power amplifier circuit 13 with an input of the headphone 19, a capacitor 17 and a resistor 18 A combined cut-off filter is composed of the combined resistance of the device 18 and the resistance of the headphones 19 and the capacitor 17.
以下、その動作について図面を参照して説明する。ま
ず、ヘッドフォン19が接続されていない場合は、入力端
子10から入力された音声信号が音量調整用の減衰器11に
よって調整され強調回路12にて、その低音域成分だけを
強調され低周波電力増幅回路13で電力を増幅されスピー
カ15を駆動する。次に、ヘッドフォン19が接続された場
合は、低周波電力増幅回路13で増幅された音声信号が、
ヘッドフォン用出力端子14の連動スイッチによって、ス
ピーカ15から切りはなされ、減衰器16で減衰させコンデ
ンサ17と抵抗器18とヘッドフォン19とで構成される低域
遮断フィルターに入力される。このとき、低域遮断フィ
ルターの時定数を小さくしておき、低音域強調回路12で
の低音域の時定数と合わせてやることによって、入力端
子10からみた周波数特性を等価的にフラットにすること
ができる。Hereinafter, the operation will be described with reference to the drawings. First, when the headphones 19 are not connected, the audio signal input from the input terminal 10 is adjusted by the attenuator 11 for adjusting the volume, and the emphasizing circuit 12 emphasizes only the low-frequency component, thereby amplifying the low-frequency power. The power is amplified by the circuit 13 and the speaker 15 is driven. Next, when the headphones 19 are connected, the audio signal amplified by the low-frequency power amplifier 13 is
The signal is cut off from the speaker 15 by the interlocking switch of the headphone output terminal 14, attenuated by the attenuator 16, and input to the low-frequency cutoff filter including the capacitor 17, the resistor 18, and the headphone 19. At this time, by making the time constant of the low-frequency cutoff filter small and matching it with the time constant of the low frequency range in the low frequency range emphasizing circuit 12, the frequency characteristics seen from the input terminal 10 are equivalently flattened. Can be.
なお、減衰器18がなくても、ヘッドフォン19の抵抗分
だけで低域遮断フィルターを構成できるが、減衰器18が
ないとヘッドフォン19を接続した瞬間に、ヘッドフォン
19の抵抗を経由して、コンデンサ17を充電あるいは放電
するため、その際発生するノズルを防止するためのもの
である。また、この低域遮断フィルターは、コンデンサ
と抵抗器、それぞれ１個ずつのみで構成できるため、安
価に構成することができる。Note that, even without the attenuator 18, the low-frequency cutoff filter can be configured only by the resistance of the headphones 19, but without the attenuator 18, the headphone 19 is connected immediately when the headphones 19 are connected.
The capacitor 17 is charged or discharged via the resistor 19 to prevent a nozzle from being generated at that time. Further, since this low-frequency cutoff filter can be composed of only one capacitor and one resistor, it can be constructed at low cost.
また、本発明は本実施例に限定されるものではなく、
本発明の趣旨に基づいて種々の変形が可能であり、これ
らを本発明の範囲から削除するものではない。Further, the present invention is not limited to the present embodiment,
Various modifications are possible based on the spirit of the present invention, and these are not excluded from the scope of the present invention.
発明の効果 以上、詳細に説明したように、本発明によれば、次の
ような効果を奏することができる。Effects of the Invention As described above in detail, according to the present invention, the following effects can be obtained.
（１） 低域遮断フィルターがコンデンサと抵抗器それ
ぞれ１個ずつで構成されるため回路の単純化が図れる。(1) Since the low-frequency cutoff filter is composed of one capacitor and one resistor, the circuit can be simplified.
（２） 構成要因である部品が少数であるため安価に構
成することができる。(2) Since the number of components, which are constituent factors, is small, it can be configured at low cost.
第１図は本発明の実施例を示す音声信号増幅回路の回路
図である。 10……入力端子、11……減衰器、12……低音域強調回
路、13……低周波電力増幅回路、14……連動スイッチ付
きヘッドフォン用出力端子、15……スピーカ、16……減
衰器、17……コンデンサ、18……抵抗器、19……ヘッド
フォン。FIG. 1 is a circuit diagram of an audio signal amplifier circuit showing an embodiment of the present invention. 10 input terminal, 11 attenuator, 12 low-frequency emphasis circuit, 13 low-frequency power amplifier circuit, 14 output terminal for headphone with interlock switch, 15 speaker, 16 attenuator , 17 ... capacitors, 18 ... resistors, 19 ... headphones.
Claims (1)
幅回路と、 前記低周波電力増幅回路の出力に接続され、その出力電
力を減衰させる減衰器と、 前記減衰器の出力に接続され前記低周波強調回路によっ
て強調された分の低音を減衰させ周波数特性を補正する
ためにコンデンサと抵抗器とから構成された低域遮断フ
ィルターと、 前記低域遮断フィルターの出力に接続された出力端子
と、 を備えた音声信号増幅回路。1. A circuit for emphasizing a low-frequency range of an audio signal, a low-frequency power amplifier circuit for inputting an output signal of the low-frequency range emphasis circuit, and an output of the low-frequency power amplifier circuit, the output power of which is connected to the low-frequency power amplifier circuit. An attenuator for attenuating, a low-frequency cutoff filter connected to an output of the attenuator and configured by a capacitor and a resistor for attenuating bass sound enhanced by the low-frequency emphasizing circuit and correcting frequency characteristics; And an output terminal connected to the output of the low-frequency cutoff filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2260926A JP2830444B2 (en) | 1990-09-28 | 1990-09-28 | Audio signal amplification circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2260926A JP2830444B2 (en) | 1990-09-28 | 1990-09-28 | Audio signal amplification circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04137903A JPH04137903A (en) | 1992-05-12 |
| JP2830444B2 true JP2830444B2 (en) | 1998-12-02 |
Family
ID=17354686
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2260926A Expired - Fee Related JP2830444B2 (en) | 1990-09-28 | 1990-09-28 | Audio signal amplification circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2830444B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4666229B2 (en) * | 2006-10-18 | 2011-04-06 | ソニー株式会社 | Audio playback device |
| JP4613932B2 (en) * | 2007-06-07 | 2011-01-19 | オンキヨー株式会社 | Amplifier circuit |
-
1990
- 1990-09-28 JP JP2260926A patent/JP2830444B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04137903A (en) | 1992-05-12 |
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