JPS60193786U - Automotive sound field correction device - Google Patents

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

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

第１図Ａは車室内の前座席における音圧周波数特性、Ｂ
は後座席における音圧周波数特性、第２図は車載用音響
装置の再生系の一例を示す構成図、第３図は音場内にお
ける直接波と反射波との一例の様子を示す図、第４図は
聴取点での音圧の周波数特性を示す図、第５図は道路状
況および走行速度に応じた自動車の車内騒音のスペクト
ルを示す図、第６図は本考案の一実施例を示すブロック
図、第７図は第６図における第１の高域補正回路の一例
を示す回路図、第８Ａ図はスピーカのエネルギーレスポ
ンスの特性図、第８Ｂ図は第７図の回路の補正周波数特
性図、第９図は第６図における走行マスキング補正回路
による周波数特性図、第１０図は第６図における第２の
高域補正回路の一例の回路図、第１１図は各車種Ａ、　
Ｂ毎の原信号ａ１第１の高域補正回路の出力ｂ１第２の
高域補正回路の出力Ｃの周波数特性図、第１２図は乗員
増加による高域レベルの低下の状態を示す周波数取性図
、第１３図は第６図における乗員数対応補正回路１６Ｌ
、１６Ｒの一例の回路図、第１４図はフロントドアに取
り付けられた左右一対のスピーカと聴取点との位置関係
を示す図、第１５図は第６図における可変利得器２５Ｌ
、２５Ｒの一例を示す回路図、第１６図は第６図におけ
る前座席側の第１の高域補正回路および乗員数対応補正
回路を一体に構成した一例の回路図、第１７図は後座席
側の第１の高域補正回路および可変利得器を一体に構成
した一例の回路図、第１８図ないし第２０図は第６図に
おける表示手段の具体的構成を示す回路図、第２１図は
スピーカをリアパーセルトレイ上に配置した場合におけ
る鏡像効果の原理を示す図、第２２図はスピーカをリア
パーセルトレイ上に配置した場合の後座席における周波
数特性を示す図、第２３図は低域カットを行なわない場
合の車室内における定在波分布図、第２４図はその周波
数特性図、第２５図は後座席側のパワーアンプの周波数
特性を示す図、第２６図は低域カットを行なった場合の
車室内における定在波分布図、第２７図はその周波数特
性図、第２８図は後座席側Ａ１前座席側Ｂおよび低音用
Ｃの各パワーアンプの周波数特性を示す図、第２９図は
車室内におけるスピーカの取付位置を示す図である。 主要部分の符号の説明、１０・・・・・・第１の高域補
正回路、１１・・・・・・走行マスキング補正回路、１
２・・・・・・前座席用スピーカの補正回路、１３・・
・・・・後座席用スピーカの補正回路、１５Ｌ、１５Ｒ
・・・・・・第２の高域補正回路、１６Ｌ、１６Ｒ・・
・・・・乗員数対応補正回路、１７Ｌ、１７Ｒ・・・・
・・ピーク・ディップ補正回路、２３Ｌ、２３Ｒ，２５
Ｌ、２５Ｒ・・・・・・可変利得器、３０・・・・・・
入力手段、３１・・・・・・表示手段。 】 Δ Ｚ５Ｌ　（２５Ｆ’） 一一〇十８ しＲ５２ ％５４ 奉ｔｑ　１￥Ｉ　　　　　ヵρFigure 1 A is the sound pressure frequency characteristic in the front seat of the vehicle interior, B
2 is a configuration diagram showing an example of a reproduction system of an in-vehicle audio device. FIG. 3 is a diagram showing an example of direct waves and reflected waves in a sound field. Figure 5 shows the frequency characteristics of sound pressure at the listening point, Figure 5 shows the spectrum of noise inside a car depending on road conditions and driving speed, and Figure 6 shows a block diagram showing an embodiment of the present invention. 7 is a circuit diagram showing an example of the first high-frequency correction circuit in FIG. 6, FIG. 8A is a characteristic diagram of the energy response of the speaker, and FIG. 8B is a correction frequency characteristic diagram of the circuit in FIG. 7. , FIG. 9 is a frequency characteristic diagram of the driving masking correction circuit in FIG. 6, FIG. 10 is a circuit diagram of an example of the second high frequency correction circuit in FIG. 6, and FIG. 11 is a diagram of each vehicle type A,
Frequency characteristic diagram of original signal a1 for each B1 Output b1 of the first high frequency correction circuit Output C of the second high frequency correction circuit, Fig. 12 shows the frequency characteristics showing the state of decrease in high frequency level due to the increase in the number of passengers. 13 is a correction circuit 16L corresponding to the number of passengers in FIG. 6.
, 16R is an example circuit diagram, FIG. 14 is a diagram showing the positional relationship between a pair of left and right speakers attached to the front door and a listening point, and FIG. 15 is a circuit diagram of an example of the variable gain device 25L in FIG. 6.
, 25R, FIG. 16 is a circuit diagram of an example in which the first high frequency correction circuit on the front seat side and the correction circuit corresponding to the number of passengers in FIG. 6 are integrated, and FIG. 17 is a circuit diagram showing an example of the rear seat side FIGS. 18 to 20 are circuit diagrams showing a specific configuration of the display means in FIG. 6, and FIG. A diagram showing the principle of the mirror image effect when the speaker is placed on the rear parcel tray. Figure 22 is a diagram showing the frequency response in the rear seat when the speaker is placed on the rear parcel tray. Figure 23 is a low frequency cut. Fig. 24 is a diagram showing the standing wave distribution in the vehicle interior when no cutting is performed, Fig. 24 is a diagram showing its frequency characteristics, Fig. 25 is a diagram showing the frequency characteristics of the power amplifier on the rear seat side, and Fig. 26 is a diagram showing the frequency characteristics of the power amplifier on the rear seat side. Fig. 27 is a diagram showing the distribution of standing waves in the vehicle interior, Fig. 28 is a diagram showing the frequency characteristics of the power amplifiers for rear seat side A, front seat side B, and bass C, Fig. 29 FIG. 2 is a diagram showing the mounting position of a speaker in a vehicle interior. Explanation of symbols of main parts, 10...First high frequency correction circuit, 11...Travel masking correction circuit, 1
2...Front seat speaker correction circuit, 13...
...Rear seat speaker correction circuit, 15L, 15R
...Second high frequency correction circuit, 16L, 16R...
... Correction circuit corresponding to the number of passengers, 17L, 17R ...
...Peak dip correction circuit, 23L, 23R, 25
L, 25R...Variable gain unit, 30...
Input means, 31...Display means. ] Δ Z5L (25F') 11018 shiR52 %54 tq 1￥I kaρ

Claims (2)

【実用新案登録請求の範囲】[Scope of utility model registration request] （１）自動車の前座席および後座席に対応して設置され
た前側および後側スピーカによる直接波とその反射波と
が作る車室音場内における音響特性の補正をなす車載用
音場補正装置であって、前記後側スピーカの低域特性を
減衰させたことを特徴とする車載用音場補正装置。(1) An in-vehicle sound field correction device that corrects the acoustic characteristics in the cabin sound field created by direct waves and their reflected waves from front and rear speakers installed corresponding to the front and rear seats of a car. An in-vehicle sound field correction device characterized in that the low-frequency characteristics of the rear speaker are attenuated. （２）前記前側および後側スピーカにさらに低音用スピ
ーカを追加してなるマルチウェイシステムにおいて、前
記低音用スピーカと前記スピーカとのクロスオーバー周
波数は前記前側スピーカと前記低音用スピーカとで決定
されることを特徴とする実用新案登録請求の範囲第１項
記載の車載用音場補正装置。(2) In a multi-way system in which a bass speaker is further added to the front and rear speakers, a crossover frequency between the bass speaker and the bass speaker is determined by the front speaker and the bass speaker. An in-vehicle sound field correction device according to claim 1 of the utility model registration claim.