| 摘要 |
PCT No. PCT/US90/05056 Sec. 371 Date Jul. 6, 1992 Sec. 102(e) Date Jul. 6, 1992 PCT Filed Sep. 6, 1990 PCT Pub. No. WO92/04711 PCT Pub. Date Mar. 19, 1992A wishbone shape articulated lateral drive assembly (19, 20) is mounted on the inner panel of the back plate (13) in a stringed instrument to energize and drive said plate (13) sideways causing sound box (15) panels to generate phase distinct vibrations as a result of sound boards' (12, 13) unison flapping movement so that clarity and response of tones improved. In order to combine the improved sound with the original sound of the instrument for increasing the tonal range, manual switching capability (21) is provided within the sound box (15) for selection of tone colors from outside the instrument. A treble enhancing assembly (45, 47) additionally is provided to brighten the instruments' sound in general and highlight the treble in particular so that tone color is improved beyond that which can be provided by conventional instruments.
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