| 摘要 |
PURPOSE:To obtain an optimum sound field by adjusting a difference component of a stereo signal in response to the driving mode. CONSTITUTION:The noise detected by a microphone 1 is amplified by an amplifier 2 and smoothed by a smoothing circuit 3. The microphone 1, the amplifier 2 and the smoothing circuit 3 constitute an automobile drive mode sensing means and the drive mode might be obtained from the drive speed of an automobile. Stereo signals L, R reproduced by an acoustic reproducing device 4 drive a speaker 6 via a sound field effect means 5. The means 5 is provided with an electronic volume 7 adjusting the difference component of the stereo signals L, R and adjusted by an output V of the smoothing means 3. Thus, the difference component of the stereo signals L, R is adjusted in response to the drive mode automatically and the sound field with optimum sense of spread and reverb is realized. |
