公开(公告)号：EP0603970A1

公开(公告)日：1994-06-29

申请号：EP93203606.4

申请日：1993-12-21

申请人： Philips Electronics N.V.

发明人： Schlösser, Theodoor Antoon Jozef ,  Sessink, Franciscus Josephus Alfonsus Maria ,  Huiberts, Mauritius Laonardus Maria

IPC分类号： H04S7/00 ,  H04S5/02 ,  H03G5/04

CPC分类号： H03G5/04 ,  H04R2499/13 ,  H04S7/307

摘要： A sound reproduction system has inputs (20, 21) for receiving audio signals (L, R). The received audio signals are split up into low-frequency audio signals (L1, R1) and high-frequency signals (Lh, Rh) by low-pass filters (23, 23a). Adjusting circuits (24, 24a) split up the high-frequency audio signals (Lh, Rh) into first sub-signals (Lh1, Rh1) and second sub-signals (Lh2, Rh2) which have, in essence, the same frequency spectra. The signal strength ratios between the first and second sub-signals can be adjusted by the adjusting circuits (24, 24a). Signal combining means (25, 25a) combine the low-frequency audio signals (L1, R1) with the second sub-signals (Lh2, Rh2). The signals obtained from the combination are fed as loudspeaker signals (LA, RA) to loudspeakers installed at the rear, left and at the rear, right in a passenger's compartment of a motor car. The sub-signals (Lh1, Rh1) are fed to loudspeakers installed at the front, left and at the front, right in the passenger's compartment.
The advantage of the sound reproduction system is that in the case where the loudspeakers installed at the rear are better capable of reproducing the bass tones than the loudspeakers installed at the front, the tone colour of the reproduced sound is not affected by a change of the adjustment of the signal strength ratio.

摘要翻译： 声音再现系统具有用于接收音频信号（L，R）的输入（20,21）。 接收到的音频信号通过低通滤波器（23,23a）分为低频音频信号（L1，R1）和高频信号（Lh，Rh）。 调整电路（24,24a）将高频音频信号（Lh，Rh）分离为第一子信号（Lh1，Rh1）和第二子信号（Lh2，Rh2），其本质上具有相同的频谱 。 第一和第二子信号之间的信号强度比可以通过调节电路（24,24a）来调节。 信号组合装置（25,25a）将低频音频信号（L1，R1）与第二子信号（Lh2，Rh2）组合。 从组合获得的信号作为扬声器信号（LA，RA）馈送到安装在后车厢左后方的扬声器，右侧位于汽车的客舱内。 子信号（Lh1，Rh1）被馈送到安装在前方，左侧和前侧的乘客舱内的扬声器。 声音再现系统的优点在于，在安装在后面的扬声器比安装在前面的扬声器更能够再现低音的情况下，再现的声音的音色不受 信号强度比的调整。