US 4,520,708 AGranted

Tone waveshape generation device

AssigneeNippon Gakki Seizo Kabushiki Kaisha

InventorMasatada Wachi

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Abstract

In a waveshape memory, a first waveshape of plural periods including an attack portion and a second waveshape of plural periods are stored. A tone waveshape signal is produced by reading out the first waveshape once and thereafter reading out the second waveshape repeatedly. The first waveshape is a first section including an attack portion cut off from a desired original tone waveshape. The second waveshape is principally composed of a second specified section succeeding the first specified section cut off from the original tone waveshape. A terminal portion in the second specified section is weighted with decay characteristics and is added with a corresponding terminal portion of the first specified section which has been weighted with attack characteristics, thereby effecting smooth connection between the respective waveshapes.

Claims4

Dependent claims

A tone waveshape generation device comprising:

memory means for storing,
a first waveshape of plural periods which is a first specified section of an original waveshape of plural periods, said original waveshape being a complete waveshape of a tone to be produced from beginning to end of the tone production and said first specified section being a section from beginning to a certain point of said original waveshape to include an attack portion thereof, and
a second waveshape of plural periods which is comprised of the concatenation of a second specified section succeeding said first specified section of said original waveshape excluding a terminal portion of said second specified section, and a terminal portion, said terminal portion being determined by adding a weighted one of a terminal portion of said first specified section and a weighted one of said terminal portion of said second specified section;
and
readout means for reading out said first waveshape once and thereafter reading out said second waveshape repeatedly from said memory means.

2 more elements

Dependencies are inferred from the claim text.