JPH03271039A - Car sound device - Google Patents
Car sound deviceInfo
- Publication number
- JPH03271039A JPH03271039A JP2066949A JP6694990A JPH03271039A JP H03271039 A JPH03271039 A JP H03271039A JP 2066949 A JP2066949 A JP 2066949A JP 6694990 A JP6694990 A JP 6694990A JP H03271039 A JPH03271039 A JP H03271039A
- Authority
- JP
- Japan
- Prior art keywords
- characteristic
- frequency
- equalizer
- frequency characteristics
- measuring means
- 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
Links
- 238000005070 sampling Methods 0.000 claims abstract description 8
- 230000015654 memory Effects 0.000 abstract description 10
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 6
- 238000009825 accumulation Methods 0.000 description 4
- 230000004044 response Effects 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
Landscapes
- Circuit For Audible Band Transducer (AREA)
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
- Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は一般にカーステレオと呼ばれている車両用音
響装置に関し、特に、イコライザの周波数特性を目動的
に調整する技術に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a vehicle audio device generally called a car stereo, and more particularly to a technique for visually adjusting the frequency characteristics of an equalizer.
（従来の技術〉
ｒ１動車内の狭い空間で良好な音質の音楽などを再生す
るには、音場としての車内の周波数特性を補正するため
に再生系にイコライザが必要になる。(Prior Art) To reproduce music with good sound quality in a narrow space inside a moving vehicle, an equalizer is required in the reproduction system to correct the frequency characteristics of the interior of the vehicle as a sound field.
また車内に搭乗している人数や、その人が座っている座
席の位置、さらには服装などによっても音場の周波数特
性が大きく変化するので、イコライザを備えていても、
手動でその特性を調整するものでは、車室内の状況の変
化に応じてたびたび調整作業を行なわなければならない
し、その調整を適切に行なうのも難しい。Furthermore, the frequency characteristics of the sound field can vary greatly depending on the number of people in the car, the position of their seats, and even their clothing, so even if an equalizer is installed,
If the characteristics are adjusted manually, adjustments must be made frequently in response to changes in the situation inside the vehicle, and it is also difficult to make the adjustments appropriately.
電気的に周波数特性を可変設定することができるイコラ
イザを備えたものでは、何種類かの周波数特性をプリセ
ットしておき、車室角の状況に応じて特性パターンを簡
Ｉｌｌに切り替えることができるようにしたものがある
。さらには、イコライザの周波数バンド毎にテスト信号
を発生し、そのテスト信号をスピーカから実際に発音し
、そのテスト音をマイクロホンで採取してバンド毎にレ
ベル比較して音場の周波数特性を測定し、その特性がフ
ラットになるようにイコライザの周波数特性を自動設定
するものがある。For models equipped with an equalizer that can electrically set frequency characteristics, several types of frequency characteristics can be preset, and the characteristic pattern can be switched to a simple pattern according to the cabin angle situation. There is something I did. Furthermore, a test signal is generated for each frequency band of the equalizer, the test signal is actually emitted from a speaker, the test sound is collected with a microphone, and the level is compared for each band to measure the frequency characteristics of the sound field. There is one that automatically sets the frequency characteristics of the equalizer so that the characteristics are flat.
（発明が解決しようとする課題）
前述のように各バンド毎のテスト音を実際に発生してイ
コライザの周波数特性を自動調整する装置でも、テープ
プレーヤ、ＣＤプレーヤ、チューナなどの音楽ソースを
聴取して楽しむ行為とは別に、テストスイッチを押し、
車室内に無機的なテスト音をある程度の音量で発生させ
ることで調整を行なうことになるが、このような調整の
ための行為を状況の変化に応じてたびたび行なうのは面
倒であるし、快適なことではない。(Problem to be Solved by the Invention) As mentioned above, even with a device that actually generates test sounds for each band and automatically adjusts the frequency characteristics of the equalizer, it is difficult to listen to music sources such as tape players, CD players, tuners, etc. Apart from the act of enjoying it, press the test switch,
Adjustments are made by generating an inorganic test sound at a certain volume in the vehicle interior, but it is troublesome to perform such adjustments frequently in response to changing conditions, and it is not comfortable. It's not a thing.
この発明は前述した従来の問題点に鑑みてなされたもの
で、その目的は、実際にスピーカから音楽などを鳴らし
て聴取している通常の使用状態のままで音場の周波数特
性に合わせてイコライザが自動調整されるようにした車
両用音響装置を提供することにある。This invention was made in view of the above-mentioned conventional problems, and its purpose is to create an equalizer that matches the frequency characteristics of the sound field under normal usage conditions when music is actually played and listened to from the speakers. An object of the present invention is to provide a vehicle acoustic device in which the sound is automatically adjusted.
（課通を解決するための手段〉
そこでこの発明では、電気的に周波数特性を可変するこ
とができるイコライザを備え、信号源からの音￥１１ご
号を前記イコライザを介して増幅しスピーカから出力す
る車両用音響装置において、前記信号源からの音響信号
の周波数特性を適宜なサンプリング期間ごとに測定する
第１の測定手段と、前記スピーカから出力された音をマ
イクロホンで採取し、そのマイクロホン出力の周波数特
性を昂１の−き１定手段と同期して測定する第２の測定
手段と、第１および第２のＡＰｊ定手段によって得られ
た２つの周波数特性の差分に基づいてその差分が小さく
なるように前記イコライザの周波数特性を自動調整する
制御手段とを設けた。(Means for solving the problem of communication) Therefore, the present invention is equipped with an equalizer that can electrically vary the frequency characteristics, amplifies the sound from the signal source via the equalizer, and outputs it from the speaker. A vehicle acoustic device includes a first measuring means for measuring the frequency characteristics of the acoustic signal from the signal source at appropriate sampling periods, and a first measuring means for collecting the sound output from the speaker with a microphone, A second measuring means that measures the frequency characteristics in synchronization with the first constant means, and a second measuring means that measures the frequency characteristics based on the difference between the two frequency characteristics obtained by the first and second APj constant means, and the difference is small. A control means is provided for automatically adjusting the frequency characteristics of the equalizer so that the frequency characteristics of the equalizer are maintained.
（作 用）
例えばテーププレーヤなどの信号源で音楽を再生し、そ
れを実際にスピーカから出力している状態において、前
記第１の測定手段では、比較的長い前記サンプリング期
間における前記信号源からの周波数特性が測定される。(Function) For example, when music is being played back by a signal source such as a tape player and is actually being output from a speaker, the first measuring means measures the amount of data from the signal source during the relatively long sampling period. Frequency characteristics are measured.
また第２のＪｌ定手段では、実際にスピーカで車室内に
放出された音の周波数特性を前記サンプリング期間と同
期してｄｐ１定される。そして前記マイクロホン出力の
周波数特性が原信号の周波数特性に近付くように、前記
制御手段によって前記イコライザの周波数特性が自動調
整される。Further, the second Jl determining means determines the frequency characteristic of the sound actually emitted into the vehicle interior by the speaker dp1 in synchronization with the sampling period. Then, the frequency characteristic of the equalizer is automatically adjusted by the control means so that the frequency characteristic of the microphone output approaches the frequency characteristic of the original signal.
（実 施 例）
第１図は本発明の一実施例による車両用音響装置の概略
構成を示している。テーププレーヤ１゜ＣＤプレーヤ２
．チューナ３などの信号源からの音響信号がプリアンプ
４．イコライザ５．メインアンプ６を紅てスピーカ７に
供給され、スピーカ７から車室内に音が放出される。な
お図示省略しているが、本装置は左右２チャンネルのス
テレオ装置であり、スピーカ７は左右両チャンネルにつ
いて車室内の前後などに多数配置される。そして、車室
内の適宜な位置にマイクロホン８が設置されており、ス
ピーカ７から車室内に放出された音をマイク８で採取す
る。(Embodiment) FIG. 1 shows a schematic configuration of a vehicle acoustic device according to an embodiment of the present invention. Tape player 1゜CD player 2
．． An acoustic signal from a signal source such as a tuner 3 is transmitted to a preamplifier 4. Equalizer 5. The sound is supplied from the main amplifier 6 to the speaker 7, and the sound is emitted from the speaker 7 into the vehicle interior. Although not shown in the drawings, this device is a stereo device with two left and right channels, and a large number of speakers 7 are arranged at the front and rear of the vehicle interior for both left and right channels. A microphone 8 is installed at an appropriate position within the vehicle interior, and the microphone 8 collects the sound emitted from the speaker 7 into the vehicle interior.
イコライザ５に人力される前の原信号はＦＦＴ（高速フ
ーリエ変換）用路９ａ、累積回路１０ａ。The original signal before being input to the equalizer 5 is passed through an FFT (fast Fourier transform) path 9a and an accumulation circuit 10a.
特性メモリｌｌａからなる第１の測定手段に供給される
。またマイクロホン８の出力はＦＦＴ＠路９ｂ、累積回
路１０ｂ、特性メモリｌｌｂからなる第２のＤＩ定手段
に入力される。A first measuring means consisting of a characteristic memory lla is supplied. Further, the output of the microphone 8 is input to a second DI determining means consisting of an FFT@path 9b, an accumulation circuit 10b, and a characteristic memory Ilb.
テーププレーヤ１．ＣＤプレーヤ２．チューナ３のいず
れかのソースからの音楽などの音響信号がプリアンプ４
．イコライザ５．メインアンプ６を経てスピーカ７から
出力されているとする。ＦＦＴ回路９ａはイコライザ５
に人力される原信号をｔｐ速でフーリエ変換して周波数
スベク）・ラムを繰り迦し出力する。累積回路１０ａは
例えば５〜１０秒捏度のサンプリング期間にＦ Ｆ Ｔ
ｌ！！回路９ａから繰り返し出力される周波数スペク
トラムを素枯し、そのサンプリング期間の平均的な周波
数スペクトラムを出力し、その特性データをメモリ１１
ａに書き込む。Tape player 1. CD player 2. An audio signal such as music from one of the sources of the tuner 3 is sent to the preamplifier 4.
．． Equalizer 5. Assume that the signal is output from the speaker 7 via the main amplifier 6. FFT circuit 9a is equalizer 5
The original signal input manually is Fourier-transformed at tp speed, and the frequency is repeated and output. The accumulation circuit 10a performs FFT during a sampling period of, for example, 5 to 10 seconds.
l! ! The frequency spectrum repeatedly outputted from the circuit 9a is depleted, the average frequency spectrum of the sampling period is outputted, and the characteristic data is stored in the memory 11.
Write in a.
ＦＦＴ回路９ｂ、累積回路１０ｂ、特性メモリ１１ｂか
らなる第２の測定手段も第１の測定手段と同期してまっ
たく同様に動作し、マイクロホン８で採取した音響信号
についての周波数特性のデータをメモリ１１ｂに格納す
る。特性メモリ１１ａと１１ｂの特性データは一定の周
期で同期して更新される。A second measuring means consisting of an FFT circuit 9b, an accumulation circuit 10b, and a characteristic memory 11b operates in exactly the same manner in synchronization with the first measuring means, and stores data on the frequency characteristics of the acoustic signal collected by the microphone 8 in the memory 11b. Store in. The characteristic data in the characteristic memories 11a and 11b are updated synchronously at a constant cycle.
メモリｌｌａに格納された原信号の周波数特性データと
、メモリｌｌｂに格納されたマイクロホン８で採取した
信号の周波数特性データとが比較部１２で比較され、両
特性データの差分が求められ、その差分データに基づい
てイコライザ５の周波数特性が各バンド毎の差分を小さ
くする方向に自動調整される。The frequency characteristic data of the original signal stored in the memory lla and the frequency characteristic data of the signal sampled by the microphone 8 stored in the memory llb are compared in the comparator 12, and the difference between both characteristic data is determined. Based on the data, the frequency characteristics of the equalizer 5 are automatically adjusted in a direction that reduces the difference between each band.
以上の動作が適当な周期で常時行なわれ、ソースからの
音楽などをスピーカ７から出力するという実使用状態に
おいて、車室内に放出された音の周波数特性が原信号の
周波数特性と等しくなるようにイコライザ５の特性が逐
次更新されていく。The above-mentioned operations are constantly performed at an appropriate cycle, and in the actual usage condition where music etc. from the source is output from the speaker 7, the frequency characteristics of the sound emitted into the vehicle interior are made to be equal to the frequency characteristics of the original signal. The characteristics of the equalizer 5 are updated sequentially.
（発明の効果〉
以上詳細に説明したように、この発明に係る車両用音響
装置では、ソースからの音楽などをスピーカから車室内
に放出している実際の使用状態において、車室内に放出
されてマイクロホンで採取された音の周波数特性が原信
号の周波数特性に等しくなるようにイコライザの周波数
特性が目動的に調整されるので、聴取者はまったく周波
数特性の補正について意識しなくても、乗車人数１乗員
の着出位置１服装それに曲物などの状況が変化して音場
の周波数特性が女動しても、それに合わせて逐次イコラ
イザの周波数特性が稠整され、常に良好な音質で音楽な
どを聴取することができる。(Effects of the Invention) As described in detail above, the vehicle audio device according to the present invention has the effect of reducing the amount of music emitted into the vehicle interior when it is actually used, such as music from a source being emitted from the speaker into the vehicle interior. The frequency characteristics of the equalizer are adjusted manually so that the frequency characteristics of the sound collected by the microphone are equal to the frequency characteristics of the original signal, so the listener does not have to be aware of the frequency characteristics correction at all when riding a car. Even if the frequency characteristics of the sound field change due to changes in the number of people, arrival and departure positions of passengers, clothing, and the surroundings, the frequency characteristics of the equalizer will be adjusted accordingly, and the music will always have good sound quality. etc. can be heard.
第１図は本発明の一実施例による車両用音響装置の概略
構成ブロック図である。
８・・・・・・・・・マイクロホンFIG. 1 is a schematic block diagram of a vehicle acoustic device according to an embodiment of the present invention. 8・・・・・・・・・Microphone
Claims (1)
を備え、信号源からの音響信号を前記イコライザを介し
て増幅しスピーカから出力する車両用音響装置において
、前記信号源からの音響信号の周波数特性を適宜なサン
プリング期間ごとに測定する第１の測定手段と、前記ス
ピーカから出力された音をマイクロホンで採取し、その
マイクロホン出力の周波数特性を第１の測定手段と同期
して測定する第２の測定手段と、第１および第２の測定
手段によって得られた２つの周波数特性の差分に基づい
てその差分が小さくなるように前記イコライザの周波数
特性を自動調整する制御手段とを備えたことを特徴とす
る。In a vehicle audio device that includes an equalizer that can electrically vary the frequency characteristics, and amplifies an acoustic signal from a signal source via the equalizer and outputs it from a speaker, the frequency characteristic of the acoustic signal from the signal source is a first measuring means for measuring at every appropriate sampling period; and a second measuring means for collecting the sound output from the speaker with a microphone and measuring the frequency characteristics of the microphone output in synchronization with the first measuring means. and a control means for automatically adjusting the frequency characteristics of the equalizer based on the difference between the two frequency characteristics obtained by the first and second measuring means so that the difference becomes smaller. do.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2066949A JPH03271039A (en) | 1990-03-19 | 1990-03-19 | Car sound device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2066949A JPH03271039A (en) | 1990-03-19 | 1990-03-19 | Car sound device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03271039A true JPH03271039A (en) | 1991-12-03 |
Family
ID=13330776
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2066949A Pending JPH03271039A (en) | 1990-03-19 | 1990-03-19 | Car sound device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03271039A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06310962A (en) * | 1992-08-05 | 1994-11-04 | Mitsubishi Electric Corp | Automatic sound volume control device |
| JP2014183392A (en) * | 2013-03-18 | 2014-09-29 | Oki Electric Ind Co Ltd | Frequency characteristic correction device and program |
-
1990
- 1990-03-19 JP JP2066949A patent/JPH03271039A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06310962A (en) * | 1992-08-05 | 1994-11-04 | Mitsubishi Electric Corp | Automatic sound volume control device |
| JP2014183392A (en) * | 2013-03-18 | 2014-09-29 | Oki Electric Ind Co Ltd | Frequency characteristic correction device and program |
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