| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To produce mellow tones with a big horn because the vibration of a resonant board amplifying sounds of piano vibrates simultaneously at the front and back, respectively, thereby eliminating half tone due to interference. <P>SOLUTION: The same size of horn is installed under the resonant board for a grand piano as shown in Fig. (2), and for an upright piano as shown in Fig. (5), and the overall length of the horn is selected by preference. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
