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Electronic musical instrument
| Details |
Inventors: Kimura, Takeji; Takemoto, Toyoki; Inoue, Michihiro; Sato, Masaharu;
Assignee: Matsushita Electric Industrial Co., Ltd. (Kadoma, JP)
Primary Examiner: Miska; Vit W.
Assistant Examiner:
Attorney, Agent or Firm: Wenderoth, Lind & Ponack
The present invention is an electronic musical instrument the type in which information of the actuation of keys is detected by scanning the keys of a keyboard. The electronic musical instrument includes keys selectively actuable for producing sounds which correspond to respective musical scale notes, circuitry for sequentially scanning these keys for detection of the information of the actuation of these keys, and a memory circuit corresponding to each of the keys so that the information of the actuation of the keys is stored in the memory circuits. |
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DETAILED DESCRIPTION What is claimed is: 1.
An electronic musical instrument comprising: a plurality of selectively actuable keying means, each of said keying means corresponding to a single musical note; a scanning means connected to said plurality of keying means for sequentially scanning said keying means for detection of the actuation of said keying means; a memory means connected to said scanning means having a plurality of capacitive elements, each of said capacitive elements corresponding to one of said plurality of keying means and storing a predetermined electrical charge when said scanning means detects the actuation of said corresponding keying means; an electrical discharging means connected to said memory means for sequential connection to each of said capacitive elements for partial discharge of said electrical charge stored therein; and a plurality of musical tone generators, each connected to a corresponding one of said capacitive elements, each for generation of a musical tone signal having a frequency proportional to said corresponding musical note and an amplitude proportional to said charge stored in said corresponding capacitive element.
2.
An electronic musical instrument as claimed in clain 1, wherein: said scanning means comprises means for sequential detection of the actuation of said keying means one by one.
3.
An electronic musical instrument as claimed in claim 1, wherein: said scanning means comprises means for sequential detection of the actuation of said keying means at a rate outside the audio frequency range and outside a range of the frequencies of said musical tone signals.
4.
An electronic musical instrument as claimed in claim 1, wherein: said memory means has a plurality of MOS transistors at least as great in number of said capacitive elements, said MOS transistors having gate capacitance for functioning as said capacitive elements.
5.
An electronic musical instrument as claimed in claim 1, wherein: said memory means has a plurality of MOS transistors at least as great in number as the number of said capacitive elements, said MOS transistors having gate capacitance, wiring capacitance and parasitic capacitance for functioning as said capacitive elements
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CPUs 
