| 摘要 |
<p>Apparatus for translating sound into a visual display comprising means for producing audio signals. The audio signals are advanced over a plurality of paths. Over one path, the audio signals are detected for voltage amplitude. Should the voltage amplitude fall within a predetermined range, a valve is operated to control the flow of liquid from a pump to a set of nozzles. Over another path, the audio signals are detected by tone detectors for dominant notes falling within various frequency bands representative of the melody of the audio signals. A resultant voltage is a function of the band of frequencies over which the dominant notes are detected. The flow of liquid from a set of nozzles is proportional to the amplitude of the voltage resulting from the band of frequencies over which the dominant notes are detected. Lamps of various colors are selectively illuminated in accordance with the band of frequencies over which the dominant notes are detected. Lastly, audio signals are advanced through a band pass filter for the detection of bass tones. A pulse or spike signal is formed from the audio signals passing through the band pass filter each time a beat is detected. Each time a pulse or spike signal is formed, a suitable valve is activated so that nozzles discharge liquid in a pulsating manner in rhythm with a beat of the audio signals. The pulse or spike signals are fed to a counter and a voltage output network to control the speed of a motor so that the movement of the nozzles is in rhythm with the audio signals.</p> |
