| 摘要 |
<p>PURPOSE:To make automatic adjustment of fed audio signals to the same level and maintain the optimum turnon/turnoff condition at all times. CONSTITUTION:The audio signal from a microphone 1 is amplified by amplifier 2 to the same level as the external input level and adjusted to a constant output level by a variable gain amplifier 4. The output is fed to a band separator 5 and segregated into 6 bands. The signal voltages obtained are fed to from the super-bass part 6a to super-treble part 6f of a voltage comparator 6. When super-bass sounds are fed continuously, signals are emitted from the first inversion to the next, so that the super-bass part 9a of a power supply switch device 9 closes the power supply circuit for a lamp 10a for lighting the applicable lamp for the period of time. In this manner, the lighting fixture A can turn on and off six lamps 10 distributed to six bands individually in tuning with the audio signal given by the microphone 1. Because the fed audio signal is automatically adjusted to the same level, the optimum turnon/turnoff condition can be maintained at all times.</p> |
