| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve the problems that the stable maintenance of frequencies of oscillation circuits connected to antennas is difficult, that the frequency regulation of the oscillation circuits before performance is necessary and that the frequency regulation during the performance is difficult. <P>SOLUTION: The theremin is constituted to store the periods of the oscillation circuits as set values in a register at the startup by using a microprocessor and to form signals for driving a digital sound source by detecting the change in the frequencies of the oscillation circuits in accordance with the set values. As a result, the need for the frequency regulation of the oscillation circuits can be eliminated and the regulation operation after the startup is performed by giving rise to a drastic change in the periods by contact with the one antenna and by updating the other set value by such detection. <P>COPYRIGHT: (C)2004,JPO |
