(57) A tone generation system is intended for use with an electronic musical instrument
of the type wherein an audible tone is generated electronically in response to actuation
of the instrument by a player. The invention generates digital signals capable of
defining either the waveshape or the envelope characteristic of a tone for each tone
initiated by such player actuation, the amplitude thereof being varied in accordance
with the intensity of the player actuation initiating that tone. To define the amplitude,
digital electronic circuits (22) are utilized for developing a digital scaling signal
corresponding to the intensity of actuation of the instrument by the player. Other
digital circuits develop (10,18) a digital waveform segment signals which define portions
of a composite waveform, as represented in an orthogonal coordinate system. Further
digital circuits (24) arithmetically manipulate these scaling signals and waveform
segment signals to give a composite output signal defining the envelope or waveform
to be produced.
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