| 摘要 |
<p>An audio system having an ornamental light display (260) has a sound pressure level detecting part (240) for detecting sound pressure level of the reproduced audio signal. The sound pressure level detecting part (240) has a first band-pass filter, a second band-pass filter, and an output signal generating part. The first band-pass filter detects the signal having frequency components in the first frequency band from the reproduced audio signal. The second band-pass filter divides the first frequency band into a number of sub-frequency bands. The output signal generating part assigns a different weighted coefficient to each sub-frequency band. A light display (260) installed in the speaker unit (270) is controlled by the control signal from a control part (250) connected to the sound pressure level detecting part (240). The light display (260) has a body of rotation for being rotated according to the control signal and a light source for illuminating the light to the body of rotation. The body of rotation includes reflective or sparkling particles. The reflective or sparkling particles float in the body of rotation.</p> |
