JPH0392098A - On-vehicle acoustic correction device - Google Patents

On-vehicle acoustic correction device

Info

Publication number
JPH0392098A
JPH0392098A JP22991589A JP22991589A JPH0392098A JP H0392098 A JPH0392098 A JP H0392098A JP 22991589 A JP22991589 A JP 22991589A JP 22991589 A JP22991589 A JP 22991589A JP H0392098 A JPH0392098 A JP H0392098A
Authority
JP
Japan
Prior art keywords
pass filter
resistor
capacitor
positive feedback
correction device
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.)
Pending
Application number
JP22991589A
Other languages
Japanese (ja)
Inventor
Hiroshi Yagi
宏 八木
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP22991589A priority Critical patent/JPH0392098A/en
Publication of JPH0392098A publication Critical patent/JPH0392098A/en
Pending legal-status Critical Current

Links

Landscapes

  • Circuit For Audible Band Transducer (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
  • Stereophonic Arrangements (AREA)

Abstract

PURPOSE:To emphasize a low frequency portion of an amplitude characteristic by using a resistor, a capacitor and an amplifier to form a positive feedback high pass filter and setting the Q at 1.0 or over. CONSTITUTION:An output of an acoustic signal source 13 is inputted to a positive feedback high pass filter 14. The positive feedback high pass filter 14 consists of resistors 17-20, capacitors 21, 22 and one operational amplifier 23 and the contacts of the resistors and the capacitors are adjusted to set the Q of the high pass filter at 1.0 or over thereby providing a peak to the amplitude characteristic near a low frequency cut-off frequency and the low frequency characteristic is emphasized. The output is fed to a power amplifier 15 and reproduced from a speaker 16, then a deficient low frequency sound is corrected. Thus, an in-cabin acoustic characteristic with balance in medium and high frequency sounds and flat characteristic is obtained.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は自動車の車室内音響特性を改善する車載用音響
補正装置に関するものである。
DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a vehicle-mounted sound correction device for improving the acoustic characteristics of a vehicle interior.

従来の技術 近年、低音の不足する車室内音響特性を補正する方法と
して、ラウドネス回路,グラフィックイコライザ回路を
用いた車載用音響補正装置が用いられているが、振幅特
性を変化させる手段ぱあ!シ考慮されていないのが現状
である。以下に従来の車載用音響補正装置について説明
する。第7図は従来の車載用音響補正装置を用いて構成
された車載用音響再生システムの一例をブロック図で示
したものである。1はカーラジオ,カーテープデッキ,
カーコンパクトディスクプレーヤなどの音響信号源、2
は半導体インダクタで共振回路を構成したイコライザ回
路、3は電力増幅器、4はスピーカである。
BACKGROUND OF THE INVENTION In recent years, in-vehicle sound correction devices using loudness circuits and graphic equalizer circuits have been used as a method for correcting the acoustic characteristics of a vehicle interior that lacks bass. Currently, this is not taken into account. A conventional vehicle-mounted sound correction device will be described below. FIG. 7 is a block diagram showing an example of a vehicle-mounted sound reproduction system configured using a conventional vehicle-mounted sound correction device. 1 is a car radio, car tape deck,
Acoustic signal source such as car compact disc player, 2
3 is an equalizer circuit having a resonant circuit configured with a semiconductor inductor, 3 is a power amplifier, and 4 is a speaker.

第8図は半導体インダクタ6、2つの増幅器6,7、抵
抗8,9,10,11、コンデンサ12により構成され
たイコライザ回路2の回路図、第9図はイコライザ回路
2の振幅特性図である。
FIG. 8 is a circuit diagram of an equalizer circuit 2 composed of a semiconductor inductor 6, two amplifiers 6, 7, resistors 8, 9, 10, 11, and a capacitor 12, and FIG. 9 is an amplitude characteristic diagram of the equalizer circuit 2. .

以上のように構成される車載用音響補正装置について、
以下その動作について説明する。
Regarding the in-vehicle sound correction device configured as above,
The operation will be explained below.

まず、音響信号源1から送られてきた信号は、第8図で
示されるイコライザ回路2で、第9図に示されるように
振幅特性の低域が強調され、電力増幅器3によって増幅
されて、スピーカ4によって再生される。その結果、従
来の低域補正装置のない再生装置だけでは不足した低域
音が補正されて再生されるので、中高域音とバランスが
とれ、フラットな車室内音響特性が得られている。
First, the signal sent from the acoustic signal source 1 is sent to the equalizer circuit 2 shown in FIG. 8, where the low frequency range of the amplitude characteristic is emphasized as shown in FIG. 9, and the signal is amplified by the power amplifier 3. It is reproduced by the speaker 4. As a result, the low-frequency sounds that are insufficient with conventional playback devices without a low-frequency correction device are corrected and reproduced, resulting in a good balance with mid- and high-frequency sounds, resulting in flat vehicle interior acoustic characteristics.

発明が解決しようとする課題 しかしながら上記の従来の構成では、半導体インダクタ
6で共振回路を構成したイコライザ回路2で振幅特性の
低域を強調するために、第8図で示されるように増幅器
6,7が最低でも二つ必要になシ、回路構成が複雑にな
るという問題点を有していた。
Problems to be Solved by the Invention However, in the above-mentioned conventional configuration, in order to emphasize the low range of the amplitude characteristic in the equalizer circuit 2, which constitutes a resonant circuit with the semiconductor inductor 6, the amplifier 6, as shown in FIG. 7 is required at least, and the circuit configuration becomes complicated.

本発明は上記従来の問題点を解決するもので、低域が強
調される振幅変化手段を一つの増幅器で実現した簡単な
回路構成の車載用音響補正装置を提供することを目的と
するものである。
The present invention solves the above-mentioned conventional problems, and aims to provide an on-vehicle sound correction device with a simple circuit configuration in which an amplitude changing means for emphasizing low frequencies is implemented using a single amplifier. be.

課題を解決するための手段 この課題を解決するために本発明の車載用音響補正装置
は、振幅変化手段を抵抗とコンデンサと一つの増幅器を
用いてハイパスフィルタのQを1.0以上に設定するこ
とによう、振幅特性の低域を強調するようにしたノ・イ
バスフィルタと、このノ・イパスフィルタの出力を増幅
する電力増幅器と、電力増幅器の出力を再生するスピー
カとから構成されるものである。
Means for Solving the Problem In order to solve this problem, the in-vehicle acoustic correction device of the present invention uses a resistor, a capacitor, and one amplifier as the amplitude changing means, and sets the Q of the high-pass filter to 1.0 or more. In particular, it consists of a no-pass filter that emphasizes the low range of the amplitude characteristic, a power amplifier that amplifies the output of this no-pass filter, and a speaker that reproduces the output of the power amplifier. It is.

作用 この構戒によって、低域が強調される振幅特性を、一つ
の増幅器で構成されたハイパスフィルタで実現すること
ができる。
Effect: With this arrangement, an amplitude characteristic that emphasizes the low frequency range can be achieved with a high-pass filter composed of a single amplifier.

実施例 以下本発明の一実施例について、図面を参照しながら説
明する。
EXAMPLE An example of the present invention will be described below with reference to the drawings.

第1図は本発明の一実施例に訃ける車載用音響補正装置
の構成を示すブロック図である。第1図において、13
はカーラジオ,カーテープデッキ,カーコンパクトディ
スクプレーヤなどの音響信号源、14は抵抗とコンデン
サと一つの演算増幅器で構成した正帰還形ハイパスフィ
ルタ、15は電力増幅器、16はスピーカである。
FIG. 1 is a block diagram showing the configuration of a vehicle-mounted sound correction device according to an embodiment of the present invention. In Figure 1, 13
14 is a positive feedback high-pass filter composed of a resistor, a capacitor, and an operational amplifier; 15 is a power amplifier; and 16 is a speaker.

第2図は正帰還形ハイパスフィルタ14の回路図である
FIG. 2 is a circuit diagram of the positive feedback high-pass filter 14.

第3図は正帰還形ハイバスフィルタ14の振幅特性図で
ある。
FIG. 3 is an amplitude characteristic diagram of the positive feedback high-pass filter 14.

以上のように構成された車載用音響補正装置について、
以下その動作を説明する。
Regarding the in-vehicle sound correction device configured as above,
The operation will be explained below.

普ず、音響信号源13の出力は正帰還形ハイバスフィル
タ14に入力される。第2図に示されるように、正帰還
形ハイパスフィルタ14は抵抗17,18.1−9.2
0とコンデンサ21.22と一つの演算増幅器23で構
成され、伝達関数は以下の式で示される。
Usually, the output of the acoustic signal source 13 is input to a positive feedback high-pass filter 14. As shown in FIG. 2, the positive feedback high-pass filter 14 has resistors 17, 18.1-9.2
0, capacitors 21 and 22, and one operational amplifier 23, and the transfer function is expressed by the following equation.

ただし、K=1+ Ry/Rs h S =j 11ω
, j = pω:角周波数,j:虚数単位 この正帰還形ハイパスフィルタ14の低域カットオフ周
波数と、共振の鋭さを示すQは、以下の式で示される。
However, K=1+ Ry/Rs h S =j 11ω
, j = pω: angular frequency, j: imaginary unit The low cutoff frequency of this positive feedback high-pass filter 14 and Q indicating the sharpness of resonance are expressed by the following equation.

ただし、ωO=2●π●Fc ここで、Qを30、カットオフ周波数をeoHzになる
ように、抵抗17を3 3.0 1 ,抵抗18を2 
2.0 KJ;? ,コンデンサ21を0.1μF1コ
ンデンサ22を0.1μF1抵抗19を39。OKg,
抵抗2oを1 5,O mlにそれぞれ定数を設定する
と、第3図に示すように、低域カットオフ周波数付近で
振幅特性にピークを持たせることができ、400HZ以
上の中高域とのレベル差が約1odB確保できる。言い
換えると、正帰還形ハイパスフィルタ14の振幅特性は
、低域を強調したものになる。この正帰還形ハイパスフ
ィルタ14を通過した出力を、電力増幅器16に加えて
スピーカ16で再生すると、従来の増幅器が二つ必要に
なるイコライザ回路で構成した車載用音響補正装置と等
しく、不足した低域音が補正されるので、中高城音とバ
ランスがとれ、フラットな車室内音響特性が得られる。
However, ωO=2●π●Fc Here, in order to set Q to 30 and cutoff frequency to eoHz, resistor 17 is 3 3.0 1 and resistor 18 is 2
2.0 KJ;? , capacitor 21 is 0.1μF1 capacitor 22 is 0.1μF1 resistor 19 is 39. OKg,
When the resistor 2o is set to a constant of 15,0 ml, the amplitude characteristics can have a peak near the low cutoff frequency, as shown in Figure 3, and the level difference with the mid-high range of 400 Hz or higher can be increased. approximately 1 odB can be secured. In other words, the amplitude characteristic of the positive feedback high-pass filter 14 emphasizes the low frequency range. When the output that has passed through the positive feedback high-pass filter 14 is reproduced by the speaker 16 in addition to the power amplifier 16, it is equivalent to the conventional in-vehicle sound correction device configured with an equalizer circuit that requires two amplifiers. Since the range sound is corrected, it is balanced with medium and high pitch sounds, resulting in a flat interior acoustic characteristic.

以上のように本実施例によれば、振幅変化手段を抵抗と
コンデンサと一つの演算増幅器を用いた正帰還形ハイパ
スフィルタ14で構成し、抵抗とコンデンサの定数を調
整して正帰還形ハイパスフィルタ14のQを30に設定
することにより、低域が強調される振幅特性を、一つの
増幅器で実現することができる。
As described above, according to this embodiment, the amplitude changing means is constituted by the positive feedback high-pass filter 14 using a resistor, a capacitor, and one operational amplifier, and the positive feedback high-pass filter 14 is constructed by adjusting the constants of the resistor and capacitor. By setting the Q of 14 to 30, amplitude characteristics that emphasize the low frequency range can be achieved with a single amplifier.

なお、上記実施例において正帰還形ハイバスフィルタ1
4のQとカットオフ周波数を決定するのに、抵抗,コン
デンサは他の定数を用いてもよい。
In addition, in the above embodiment, the positive feedback high-pass filter 1
To determine the Q of 4 and the cutoff frequency, other constants may be used for the resistor and capacitor.

第4図に示すように、Qを2.0に設定するには、抵抗
17を1.2 K(;j 、抵抗18を7 s l ,
コンデンサ21を0.27μF、コンデンサ22を0.
27μF、抵抗20を10KJ;’とする。このとき6
0HZで約edB低域を強調できる。同様に、Qを1.
0に設定すると、約1dB低域を強調できる。壕た、第
5図に示すように、Qを変化させずにカットオフ周波数
を大きくするには、コンデンサ21とコンデンサ22の
定数を小さくシ、カットオフ周波数を小さくするには、
コンデンサ21とコンデンサ22の定数を大きくする。
As shown in FIG. 4, to set Q to 2.0, resistor 17 is set to 1.2 K (;j, resistor 18 is set to 7 s l ,
Capacitor 21 is 0.27μF, capacitor 22 is 0.27μF.
27μF, and the resistor 20 is 10KJ;'. At this time 6
Approximately edB low frequency can be emphasized at 0Hz. Similarly, set Q to 1.
When set to 0, the low range can be emphasized by approximately 1 dB. In addition, as shown in Fig. 5, in order to increase the cutoff frequency without changing Q, the constants of capacitors 21 and 22 must be decreased, and in order to decrease the cutoff frequency,
Increase the constants of capacitor 21 and capacitor 22.

また、第6図に示すように、抵抗17を33K,2、抵
抗18を22KJ7,コyデンサ21を01μF,コン
デンサ22を0.1μF1抵抗19を39K.1;?,
抵抗20を1 5 Kgとすると、qを3.0に設定し
た状態で利得を全周波数帯域で11(IB持たせること
ができる。この場合、後ろに接続する電力増幅器15の
電圧増幅回路の負担を軽くする効果がある。
Further, as shown in FIG. 6, the resistor 17 is 33K, 2, the resistor 18 is 22KJ7, the capacitor 21 is 01μF, the capacitor 22 is 0.1μF, the resistor 19 is 39K. 1;? ,
If the resistance 20 is 15 Kg, the gain can be set to 11 (IB) in the entire frequency band with q set to 3.0. In this case, the load on the voltage amplification circuit of the power amplifier 15 connected afterwards It has the effect of making it lighter.

さらに、抵抗17と抵抗18、コンデンサ21とコンデ
ンサ22をそれぞれ等しくすると、Qは抵抗19と抵抗
2oの比で決定できるので、定数の設定が簡単に行える
。筐た、上記実施例において、ハイパスフィルタは正帰
還形ハイパスフィルタ14としたが、正帰還形ハイバス
フィルタ14は、多重帰還形ハイパスフィルタで構成し
てもよい0 発明の効果 以上のように本発明は、振幅変化手段を抵抗とコンデン
サと一つの増幅器を用いたハイパスフィルタで構威し、
抵抗とコンデンサの定数を調整してハイパスフィルタの
Qを10以上に設定することにより、信号の低域を強調
する振幅特性を構戒することができる優れた車載用音響
補正装置を実現できるものである。
Further, if the resistors 17 and 18 and the capacitors 21 and 22 are made equal, Q can be determined by the ratio of the resistors 19 and 2o, and therefore the constant can be easily set. In the above embodiment, the high-pass filter is a positive feedback high-pass filter 14, but the positive feedback high-pass filter 14 may be a multiple feedback high-pass filter. In the invention, the amplitude changing means is composed of a high-pass filter using a resistor, a capacitor, and one amplifier,
By adjusting the constants of the resistor and capacitor and setting the Q of the high-pass filter to 10 or more, it is possible to realize an excellent in-vehicle sound correction device that can control the amplitude characteristics that emphasize the low frequency range of the signal. be.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明の一実施例における車載用音響補正装置
のブロック図、第2図は第1図のハイバスフィルタの回
路図、第3図は第1図のハイパスフィルタの振幅特性図
、第4図は第1図のハイバスフィルタのQを変化させた
ときの振幅特性図、第6図は第1図のハイパスフィルタ
のQを一定にしたときの振幅特性図、第6図は第1図の
ハイパスフィルタの利得を変化させたときの振幅特性図
、第7図は従来の車載用音響補正装置のブロソク図、第
8図は第7図のイコライザ回路の回路図、第9図は第4
図のイコライザ回路の振幅特性図である。 13・・・・・・音響信号源、14・・・・・・ハイパ
スフィルタ、16・・・・・・電力増幅器、 17〜20・・・・・・抵抗、21 23・・・・・・演算増幅器。
FIG. 1 is a block diagram of an in-vehicle acoustic correction device according to an embodiment of the present invention, FIG. 2 is a circuit diagram of the high-pass filter of FIG. 1, and FIG. 3 is an amplitude characteristic diagram of the high-pass filter of FIG. 1. Figure 4 is an amplitude characteristic diagram when the Q of the high-pass filter in Figure 1 is varied; Figure 6 is an amplitude characteristic diagram when the Q of the high-pass filter in Figure 1 is kept constant; Figure 1 is an amplitude characteristic diagram when changing the gain of the high-pass filter, Figure 7 is a block diagram of a conventional in-vehicle acoustic correction device, Figure 8 is a circuit diagram of the equalizer circuit in Figure 7, and Figure 9 is a diagram of the equalizer circuit shown in Figure 7. Fourth
FIG. 3 is an amplitude characteristic diagram of the equalizer circuit shown in the figure. 13...Acoustic signal source, 14...High pass filter, 16...Power amplifier, 17-20...Resistor, 21 23... operational amplifier.

Claims (1)

【特許請求の範囲】[Claims] 音響電気信号を発生する音響信号源からの信号の振幅を
変化させる振幅変化手段を抵抗とコンデンサと一つの増
幅器を用い、上記抵抗とコンデンサの定数を調整してハ
イパスフィルタのQを1.0以上に設定することにより
信号の振幅特性の低域を強調するように構成したハイパ
スフィルタと、このハイパスフィルタの出力を増幅する
電力増幅器と、電力増幅器の出力を再生するスピーカと
から構成される車載用音響補正装置。
The amplitude changing means for changing the amplitude of the signal from the acoustic signal source that generates the acoustic electrical signal uses a resistor, a capacitor, and one amplifier, and the constants of the resistor and capacitor are adjusted to increase the Q of the high-pass filter to 1.0 or more. An in-vehicle device consisting of a high-pass filter configured to emphasize the low range of the amplitude characteristics of the signal by setting it to , a power amplifier that amplifies the output of this high-pass filter, and a speaker that reproduces the output of the power amplifier. Acoustic correction device.
JP22991589A 1989-09-05 1989-09-05 On-vehicle acoustic correction device Pending JPH0392098A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP22991589A JPH0392098A (en) 1989-09-05 1989-09-05 On-vehicle acoustic correction device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP22991589A JPH0392098A (en) 1989-09-05 1989-09-05 On-vehicle acoustic correction device

Publications (1)

Publication Number Publication Date
JPH0392098A true JPH0392098A (en) 1991-04-17

Family

ID=16899734

Family Applications (1)

Application Number Title Priority Date Filing Date
JP22991589A Pending JPH0392098A (en) 1989-09-05 1989-09-05 On-vehicle acoustic correction device

Country Status (1)

Country Link
JP (1) JPH0392098A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04320199A (en) * 1991-04-19 1992-11-10 Matsushita Electric Ind Co Ltd Acoustic reproducing device
JPH05347798A (en) * 1992-06-15 1993-12-27 Rion Co Ltd Tone quality adjusting circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04320199A (en) * 1991-04-19 1992-11-10 Matsushita Electric Ind Co Ltd Acoustic reproducing device
JPH05347798A (en) * 1992-06-15 1993-12-27 Rion Co Ltd Tone quality adjusting circuit

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