JPH04334298A - Low-sound range correction circuit of acoustic reproducing device - Google Patents
Low-sound range correction circuit of acoustic reproducing deviceInfo
- Publication number
- JPH04334298A JPH04334298A JP3105481A JP10548191A JPH04334298A JP H04334298 A JPH04334298 A JP H04334298A JP 3105481 A JP3105481 A JP 3105481A JP 10548191 A JP10548191 A JP 10548191A JP H04334298 A JPH04334298 A JP H04334298A
- Authority
- JP
- Japan
- Prior art keywords
- sound
- low
- correction circuit
- resistor
- volume
- 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
- 239000003990 capacitor Substances 0.000 claims description 13
- 230000003321 amplification Effects 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 101000582320 Homo sapiens Neurogenic differentiation factor 6 Proteins 0.000 description 1
- 102100030589 Neurogenic differentiation factor 6 Human genes 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000873 masking effect Effects 0.000 description 1
- 230000011514 reflex Effects 0.000 description 1
- 230000001755 vocal effect Effects 0.000 description 1
Landscapes
- Circuit For Audible Band Transducer (AREA)
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は低音域補正回路を備えた
音響再生装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound reproduction device equipped with a low frequency range correction circuit.
【０００２】0002
【従来の技術】従来の音域補正回路を備えた音響再生装
置について図面を用いて説明する。図３は音量に連動さ
せて中高音域と低音域のレベルを変化させるように構成
された従来の音響再生装置の音域補正回路の回路図を示
し、音量調整用可変抵抗器１０に中点タップ付のものを
用い、そこに抵抗１１，１２とコンデンサ１３，１４に
よる時定数回路を接続することによって構成されている
。2. Description of the Related Art A sound reproduction apparatus equipped with a conventional sound range correction circuit will be described with reference to the drawings. FIG. 3 shows a circuit diagram of a range correction circuit of a conventional sound reproduction device configured to change the levels of medium and high ranges and low ranges in conjunction with the volume. A time constant circuit including resistors 11 and 12 and capacitors 13 and 14 is connected thereto.
【０００３】中音域に対してはコンデンサ１３のリアク
タンスは充分に高く、コンデンサ１４のリアクタンスが
低くなるように各定数を定め、中音域のレベルは音量調
整用可変抵抗器１０を調整することのみによって変化す
るように構成されていた。Each constant is determined so that the reactance of the capacitor 13 is sufficiently high and the reactance of the capacitor 14 is low for the midrange, and the level of the midrange can be adjusted only by adjusting the variable resistor 10 for volume adjustment. It was designed to change.
【０００４】また、高音域についてはコンデンサ１３の
リアクタンスが低くなることによりレベルが上昇し、低
音域についてはコンデンサ１４のリアクタンスが高くな
ることによってレベルが上昇するように構成されたもの
であった。[0004] Furthermore, in the high frequency range, the level increases as the reactance of the capacitor 13 decreases, and in the low frequency range, the level increases as the reactance of the capacitor 14 increases.
【０００５】また、この回路を備えた従来の音響再生装
置の周波数特性は図４に示すようになっているが、この
周波数特性は一般に知られているラウドネス曲線を実現
させようとしたものであった。[0005]Furthermore, the frequency characteristics of a conventional sound reproduction device equipped with this circuit are as shown in FIG. 4, but this frequency characteristic is not an attempt to realize a generally known loudness curve. Ta.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら上記従来
の構成では、音域補正回路を備えた音響再生装置によっ
て得られる周波数特性が１ＫＨｚを中心としてなだらか
な特性変化をしているため、音量の小さい領域では中低
音域のこもり感が発生し、特にボーカルが引っ込んだ感
じを受けるものであり、このような特性を改善し低音域
及び高音域を上昇するロールオル周波数を調整しても基
本的に１次のフィルタ構成であるために、必要な周波数
のみを上昇させることは困難であった。[Problem to be Solved by the Invention] However, in the above-mentioned conventional configuration, the frequency characteristics obtained by the sound reproduction device equipped with the range correction circuit have a gentle characteristic change centered around 1 KHz, so in the low volume region This creates a muffled feeling in the mid-bass range, and vocals in particular feel recessed. Even if you improve these characteristics and adjust the roll-o frequency, which raises the bass and treble ranges, basically the first order Because of the filter configuration, it was difficult to increase only the necessary frequencies.
【０００７】本発明はこのような従来の課題を解決し、
低音域における所望の周波数を音量に対して自然な低音
域補正を行うことを目的とするものである。The present invention solves these conventional problems,
The purpose of this invention is to perform natural bass range correction on the volume of a desired frequency in the bass range.
【０００８】[0008]
【課題を解決するための手段】上記課題を解決するため
に本発明による音響再生装置の低音域補正回路は、演算
増幅器を用いた２次の正帰還型高域通過フィルタに音量
調整用可変抵抗器と連動する連動型可変抵抗器を上記２
次の正帰還型高域通過フィルタの帰還抵抗と並列に接続
した構成とすることにより、小音量時に特に不足する低
音域を、中高音域をマスキングしない周波数のみ増幅し
、上記２次の正帰還型高域通過フィルタのＱを音量調整
用可変抵抗器により連続的に可変するようにしたもので
ある。[Means for Solving the Problems] In order to solve the above problems, the low frequency correction circuit of the sound reproduction device according to the present invention includes a variable resistor for volume adjustment in a second-order positive feedback high-pass filter using an operational amplifier. The interlocking type variable resistor that interlocks with the
By connecting the feedback resistor of the next positive feedback type high-pass filter in parallel, only the frequencies that do not mask the mid-to-high range are amplified, and the low frequency range, which is particularly lacking at low volumes, is amplified, and the second-order positive feedback The Q of the type high-pass filter is continuously varied by a variable resistor for volume adjustment.
【０００９】[0009]
【作用】この構成により、２次の正帰還型高域通過フィ
ルタの帰還抵抗と音量調整用可変抵抗器に連動した連動
型可変抵抗器を並列に接続した構成としているため、２
次の正帰還型高域通過フィルタにおけるＱの変化が音量
の変化に対して自然に変化することが可能であり、特に
中点タップ付等の特殊な音量調整用可変抵抗器は必要と
せず、ブースト周波数やレベルはコンデンサ及び抵抗値
のみを変更するだけで可変可能となる。[Operation] With this configuration, the feedback resistor of the second-order positive feedback high-pass filter and the variable resistor linked to the variable resistor for volume adjustment are connected in parallel.
The change in Q in the following positive feedback high-pass filter can change naturally with changes in volume, and there is no need for a special volume adjustment variable resistor with a center tap. The boost frequency and level can be varied by simply changing the capacitor and resistance values.
【００１０】また、低音域のロールオフ周波数が１２ｄ
Ｂ／ｏｃｔで減衰しており、音量最大時にＱを０．７前
後に設定し、小音量時にはＱを大きく設定することによ
りスピーカの異常振幅を抑えることができる。[0010] Also, the roll-off frequency of the bass range is 12d.
It is attenuated by B/oct, and abnormal amplitude of the speaker can be suppressed by setting Q to around 0.7 when the volume is maximum, and setting Q to a large value when the volume is low.
【００１１】[0011]
【実施例】以下、本発明の一実施例における音響再生装
置の低音域補正回路について図面を用いて説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a low frequency range correction circuit of a sound reproducing apparatus according to an embodiment of the present invention will be described with reference to the drawings.
【００１２】図１は本発明による音響再生装置の低音域
補正回路の構成を示す回路図であり、第１のコンデンサ
１と第２のコンデンサ２と第１〜第４の抵抗３，４，５
，６と演算増幅器８から２次の正帰還型高域通過フィル
タを構成し、音量調整用可変抵抗器９と連動するように
構成された連動型可変抵抗器７を２次の正帰還型高域通
過フィルタの増幅度を決定する第３の抵抗５と並列に接
続した構成としている。FIG. 1 is a circuit diagram showing the configuration of a low frequency correction circuit of a sound reproducing device according to the present invention, which includes a first capacitor 1, a second capacitor 2, and first to fourth resistors 3, 4, 5.
, 6 and an operational amplifier 8 constitute a second-order positive feedback type high-pass filter, and an interlocking type variable resistor 7 configured to interlock with the volume adjustment variable resistor 9 is connected to a second-order positive feedback type high-pass filter. It is configured to be connected in parallel with a third resistor 5 that determines the amplification degree of the pass filter.
【００１３】このように構成された本発明による音響再
生装置の低音域補正回路の伝達関数は、第１のコンデン
サ１をＣ１、第２のコンデンサをＣ２、第１の抵抗３を
Ｒ１、第２の抵抗４をＲ２、第３の抵抗５をＲｆ、第４
の抵抗６をＲｓとすると（数１）のようになる。The transfer function of the low frequency correction circuit of the sound reproducing apparatus according to the present invention configured as described above is such that the first capacitor 1 is C1, the second capacitor C2 is C2, the first resistor 3 is R1, and the second The resistor 4 is R2, the third resistor 5 is Rf, and the fourth resistor 5 is R2.
If the resistance 6 of is Rs, it becomes as shown in (Equation 1).
【００１４】[0014]
【数１】[Math 1]
【００１５】また、このとき、遮断周波数とＱは（数２
），（数３）のようになる。[0015] Also, at this time, the cutoff frequency and Q are (Equation 2)
), (Equation 3).
【００１６】[0016]
【数２】[Math 2]
【００１７】[0017]
【数３】[Math 3]
【００１８】これにより、演算増幅器８の増幅度Ｋを大
きくするとＱが大きくなり遮断周波数は変化しないよう
になる。As a result, when the amplification degree K of the operational amplifier 8 is increased, the Q becomes larger and the cutoff frequency does not change.
【００１９】そこで第３の抵抗５と一方の音量調整用可
変抵抗器９を音量が大きくなる方向へ変化させた時、も
う一方の連動型可変抵抗器７の抵抗値が小さくなるよう
に並列に接続することにより、Ｑを音量によって可変す
ることが可能となる。Therefore, when the third resistor 5 and one volume adjusting variable resistor 9 are changed in the direction of increasing the volume, the resistance value of the other interlocking variable resistor 7 is reduced. By connecting, it becomes possible to vary Q depending on the volume.
【００２０】このような構成によって得られる本発明に
よる音響再生装置の低音域補正回路の音量調整用抵抗変
化に対する周波数特性の変化を図２に示す。FIG. 2 shows a change in frequency characteristics with respect to a change in the volume adjustment resistance of the bass range correction circuit of the sound reproduction apparatus according to the present invention obtained by such a configuration.
【００２１】[0021]
【発明の効果】本発明による音響再生装置の低音域補正
回路は、従来のラウドネス回路と異なり音楽再生に必要
な低音域のみを音量毎に補償することかできるため、中
高音域に大幅な音質変化を与えることなく音量調整時に
自然な効果を得ることができる。特に、比較的小型のバ
スレフボックスや車載用システムのロードノイズによる
低音域のマスキングを補償する時に有効である。[Effects of the Invention] Unlike conventional loudness circuits, the bass range correction circuit of the sound reproduction device according to the present invention can compensate only the bass range required for music reproduction for each volume, so the sound quality is significantly improved in the mid-to-high range. A natural effect can be obtained when adjusting the volume without causing any changes. It is particularly effective when compensating for masking in the low frequency range due to road noise in relatively small bass reflex boxes and in-vehicle systems.
【００２２】また車載用システムでは室内が狭く、低音
域再生に限界があり、またスピーカの取りつけ状態の悪
さなどにより低音域をカットする場合が多いが、本発明
の音響再生装置の低音域補正回路を用いれば超低音域を
カットしつつ低音域レベルを上昇させ、最大音量時には
通常の低音域カットフィルタとなるため、スピーカの過
振幅による歪みの発生等を抑える効果もある。[0022] In addition, in a car-mounted system, the room is small, there is a limit to low frequency reproduction, and the low frequency range is often cut due to poor speaker mounting conditions. By using this, the low frequency range level is raised while cutting the super low frequency range, and since it becomes a normal low frequency cut filter at maximum volume, it also has the effect of suppressing the occurrence of distortion due to excessive amplitude of the speaker.
【図１】本発明の一実施例による音響再生装置の低音域
補正回路の構成を示す回路図FIG. 1 is a circuit diagram showing the configuration of a low frequency correction circuit of a sound reproduction device according to an embodiment of the present invention.
【図２】本発明の低音域補正回路を備えた音響再生装置
の特性図[Fig. 2] Characteristic diagram of a sound reproduction device equipped with a low frequency correction circuit of the present invention
【図３】従来の音響再生装置の音域補正回路の構成を示
す回路図[Fig. 3] A circuit diagram showing the configuration of a range correction circuit of a conventional sound reproduction device.
【図４】従来の音域補正回路を備えた音響再生装置の特
性図[Figure 4] Characteristic diagram of a sound reproduction device equipped with a conventional range correction circuit
１ 第１のコンデンサ ２ 第２のコンデンサ ３ 第１の抵抗 ４ 第２の抵抗 ５ 第３の抵抗 ６ 第４の抵抗 ７ 連動型可変抵抗器 ８ 演算増幅器 ９ 音量調整用可変抵抗器 1 First capacitor 2 Second capacitor 3 First resistance 4 Second resistance 5 Third resistance 6 Fourth resistance 7 Interlocking variable resistor 8 Operational amplifier 9. Variable resistor for volume adjustment
Claims (2)
抵抗と演算増幅器からなる２次の正帰還型高域通過フィ
ルタに音量調整用可変抵抗器と連動する連動型可変抵抗
器を上記２次の正帰還型高域通過フィルタの帰還抵抗で
ある第３の抵抗と並列に接続した音響再生装置の低音域
補正回路。Claim 1: A variable resistor interlocked with a variable resistor for volume adjustment to a second-order positive feedback high-pass filter consisting of first and second capacitors, first to fourth resistors, and an operational amplifier. A low frequency correction circuit for an audio reproduction device, which is connected in parallel with a third resistor which is a feedback resistor of the second-order positive feedback high-pass filter.
域の増幅度及び遮断周波数におけるＱを連動可変する請
求項１記載の音響再生装置の低音域補正回路。2. The low frequency correction circuit for a sound reproducing apparatus according to claim 1, wherein the amplification degree of the pass band and Q at the cutoff frequency of the second-order positive feedback high-pass filter are variable in conjunction with each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3105481A JP3063217B2 (en) | 1991-05-10 | 1991-05-10 | Bass correction circuit of sound reproduction device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3105481A JP3063217B2 (en) | 1991-05-10 | 1991-05-10 | Bass correction circuit of sound reproduction device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04334298A true JPH04334298A (en) | 1992-11-20 |
| JP3063217B2 JP3063217B2 (en) | 2000-07-12 |
Family
ID=14408782
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3105481A Expired - Fee Related JP3063217B2 (en) | 1991-05-10 | 1991-05-10 | Bass correction circuit of sound reproduction device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3063217B2 (en) |
-
1991
- 1991-05-10 JP JP3105481A patent/JP3063217B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP3063217B2 (en) | 2000-07-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |