| 摘要 |
PURPOSE:To make it possible for a speaker to confirm the interval of his or her generated voice visually by displaying the interval by lamps. CONSTITUTION:A sound to be detected, applied to input terminal P1 via a microphone, is amplified to a constant value by preamplifier P and outputted to output terminal P0. This output passes through only one of band-pass filters F1-F5 that agrees with the frequency of the sound to be detected. Each filter is provided with eight filter elements differing successively in passing band and eight by five, i.e. forty outputs are applied to transposing converter S. Transposing converter S, consisting of conversion part S1 and change-over part S2, is changed over externally according to the music scale. In this constitution, the sound to be detected from preamplifier P passes through one of band-pass filters F1-F5 to drive driver transistor group T, which turns on corresponding display lamps in group PL to display a musical interval in standard interval display unit PD, thereby confirming it visually. |
