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An attachment part is disposed on a part of the edge of a resonance plate, which is made of a metal containing copper, and a weight is attached to the resonance plate at a predetermined distance from the attachment part. Plural vibration pickups are attached to the surface of the resonance plate bet

An attachment part is disposed on a part of the edge of a resonance plate, which is made of a metal containing copper, and a weight is attached to the resonance plate at a predetermined distance from the attachment part. Plural vibration pickups are attached to the surface of the resonance plate between the weight and the attachment part. The resonance plate is attached to a percussion instrument at the attachment part. The plural vibration pickups produce electric signals corresponding to the resonant vibrations at their respective positions on the resonance plate, and the electric signals are mixed and output as percussion-instrument-sound signals.

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What is claimed is: 1. A percussion-instrument pickup, comprising: a resonance plate that is made of a metal containing at least copper and has an area smaller than the area of a hitting surface of a percussion instrument to which the percussion-instrument pickup is attached; a weight part attached

What is claimed is: 1. A percussion-instrument pickup, comprising: a resonance plate that is made of a metal containing at least copper and has an area smaller than the area of a hitting surface of a percussion instrument to which the percussion-instrument pickup is attached; a weight part attached to a part of the perimeter of the resonance plate, said weight part having a volume of material separate from said resonance plate; an attachment part disposed at a predetermined distance from the point of attachment of the weight part; and a plurality of vibration pickups attached to the surface of said resonance plate between said attachment part and said weight part; wherein: said attachment part is configured to be attached to an inner wall of a body supporting said hitting surface of said percussion instrument, said resonance plate is configured to be attached to said inner wall of said body via said attachment part in a cantilever configuration, to be disposed inside said hitting surface, to be excited by a vibration of said body, said weight part is configured to be disposed inside said hitting surface and spaced apart therefrom when said resonance plate is attached to said inner wall of said body via said attachment part in the cantilever configuration, said vibration pickups are configured to be disposed inside said hitting surface and spaced apart therefrom when said resonance plate is attached to said inner wall of said body via said attachment part in the cantilever configuration, to produce sound signals from resonance of said resonance plate, a resonance frequency of said resonance plate depends on a weight of said weight part. 2. The percussion-instrument pickup according to claim 1, wherein said hitting surface is substantially circular in shape, said resonance plate has a substantially rectangular shape, the longer side thereof being shorter than the diameter of the hitting surface of the percussion instrument to which the percussion-instrument pickup is attached, the weight part being attached to one of the shorter sides thereof, and the attachment part being disposed at the other shorter side, and the plurality of vibration pickups are attached to the surface of said resonance plate between the attachment part and the point of attachment of the weight part. 3. The percussion-instrument pickup according to claim 1, wherein said resonance plate has one or more notches formed in an edge thereof, the one or more notches divide said resonance plate into a plurality of resonance elements, and each of the plurality of resonance elements has a vibration pickup attached thereto. 4. The percussion-instrument pickup according to claim 2, wherein said resonance plate has one or more notches formed in an edge thereof, the one or more notches divide said resonance plate into a plurality of resonance elements, and each of the plurality of resonance elements has a vibration pickup attached thereto. 5. An electric percussion instrument that comprises cylindrical body and a drumhead attached over an open end of the cylindrical body and produces a drum sound when the drumhead is hit, wherein the electric percussion instrument further comprises a percussion-instrument pickup that has a resonance plate that is made of a metal containing at least copper and has an area smaller than that of said drumhead, a weight part attached to a part of the perimeter of the resonance plate, said weight part having a volume of material separate from said resonance plate, an attachment part disposed at a predetermined distance from the point of attachment of the weight part, and a plurality of vibration pickups attached to the surface of said resonance plate between said attachment part and said weight part, and said resonance plate of said percussion-instrument pickup is attached to the inner wall of said body via said attachment part in a cantilever configuration, said resonance plate is disposed inside said drumhead, said weight part and said vibration pickups disposed inside said drumhead and spaced apart therefrom, said resonance plate supported in the cantilever configuration is excited by a vibration of said body, a resonance frequency of said resonance plate depends on a weight of said weight part, and said vibration pickups attached to said resonance plate produce drum-sound signals from the resonance of said resonance plate. 6. The electric percussion instrument according to claim 5, wherein said resonance plate has a substantially rectangular shape, the longer side thereof being shorter than the diameter of the drumhead, the weight part being attached to one of the shorter sides thereof, and the attachment part being disposed at the other shorter side, and the plurality of vibration pickups are attached to the surface of said resonance plate between the attachment part and the point of attachment of the weight part. 7. The electric percussion instrument according to claim 5, wherein said resonance plate has one or more notches formed in an edge thereof, the one or more notches divide said resonance plate into a plurality of resonance elements, and each of the plurality of resonance elements has a vibration pickup attached thereto. 8. The electric percussion instrument according to claim 6, wherein said resonance plate has one or more notches formed in an edge thereof, the one or more notches divide said resonance plate into a plurality of resonance elements, and each of the plurality of resonance elements has a vibration pickup attached thereto. 9. The electric percussion instrument according to claim 5, wherein a part of said resonance plate of said percussion-instrument pickup is in contact with said drumhead in the vicinity of the joint between said drumhead and said body, and said resonance plate is supplied with excitation energy from both said body and said drumhead. 10. The electric percussion instrument according to claim 5, wherein said drumhead is composed of a perforated polymeric resin film that has pores formed therein with an opening ratio of about 20 to 45%. 11. The electric percussion instrument according to claim 10, wherein said pores formed in said drumhead are arranged in a 60-degree staggered pattern. 12. An electric percussion instrument, comprising: a cymbal that is composed of a disk-like metal plate and has a protruding cup at the center thereof, a bow surrounding the cup, and an edge surrounding the bow; and a percussion-instrument pickup that has a resonance plate that is made of a metal containing at least copper and has an area smaller than the area of said cymbal, a weight part attached to a part of the perimeter of the resonance plate, said weight part having a volume of material separate from said resonance plate, an attachment part disposed at a predetermined distance from the point of attachment of the weight part, and a plurality of vibration pickups attached to the surface of said resonance plate between said attachment part and said weight part, wherein said attachment part of said resonance plate of said percussion-instrument pickup is attached to the backside of said cup, said resonance plate is attached to the backside of said cup via said attachment part in a cantilever configuration, said resonance plate is disposed inside said bow, said weight part and said vibration pickups disposed inside said bow and spaced apart therefrom, the resonance plate of said percussion-instrument pickup is excited by a vibration of said cup, a resonance frequency of said resonance plate depends on a weight of said weight part, and said vibration pickups produce electric signals having a waveform corresponding to the sound of the cymbal. 13. The electric percussion instrument according to claim 12, wherein said resonance plate has a substantially rectangular shape, the longer side thereof being shorter than the diameter of the hitting surface or a percussion instrument to which the percussion-instrument pickup is attached, the weight part being attached to one of the shorter sides thereof, and the attachment part being disposed at the other shorter side, and the plurality of vibration pickups are attached to the surface of said resonance plate between the attachment part and the point of attachment of the weight part. 14. The electric percussion instrument according to claim 12, wherein said resonance plate has one or more notches formed in an edge thereof, the one or more notches divide said resonance plate into a plurality of resonance elements, and each of the plurality of resonance elements has a vibration pickup attached thereto. 15. The electric percussion instrument according to claim 13, wherein said resonance plate has one or more notches formed in an edge thereof, the one or more notches divide said resonance plate into a plurality of resonance elements, and each or the plurality of resonance elements has a vibration pickup attached thereto. 16. The electric percussion instrument according to claim 12, wherein multiple pores are formed in the bow and edge of said cymbal.