| 摘要 |
An optical metronome using sheets of music of non-sagging sheets of translucent material with notes spaced according to their value and vertically aligned measures on a display panel of light columns formed of vertical bars of triangular cross-section in white reflectors with an angular air gap and a light source for each bar. Circuitry coordinates sequential lighting of the bars in proper musical tempo and properly placed downbeat and is also attached or attachable to electronic organ circuitry or stands alone with automatic turn-off of lights to the bars if organ not counting. |
