Waveform generation device capable of reading waveform memory in plural modes

An electronic musical instrument comprising:

• tone designation means for designating a tone to be generated;
• waveform memory means for storing waveform sample value data;
• mode designation means for designating a first mode or a second mode;
• and
• processing means for controlling reading of the waveform memory means depending upon which of the first mode and the second mode is designated and, when the first mode has been designated, performing a processing for producing and outputting one waveform sample value datum on the basis of plural sample value data read from the waveform memory means and, when the second mode has been designated, performing a processing for producing and outputting one waveform sample value datum on the basis of one sample value datum read from the waveform memory means.

A tone waveform generation device comprising:

• function generation means for generating plural kinds of functions necessary for generation of a single tone by a time division multiplexing operation;
• wherein:
• the function generation means comprises a plurality of circuits;
• and
• the plural kinds of functions are generated by the time division multiplexing operation using common circuits;
• and
• waveform generation means for forming at least one tone waveform signal controlled by the plural kinds of functions supplied by said function generation means, each of the plural kinds of functions achieving a characteristic of the tone waveform signal which is different from that achieved by each other of the plural kinds of functions.

A tone signal generation device comprising:

• waveform supply means for supplying sample value data on the basis of which a tone waveform is formed;
• function generation means for generating plural kinds of functions necessary for generating a single tone;
• and
• waveform processing means for subjecting the sample value data supplied by said waveform supply means to plural processings by a time division multiplexing operation on the basis of the plural kinds of functions supplied by said function generation means thereby to form and output at least one tone waveform signal, wherein:
• each of the plural kinds of functions is for achieving a characteristic of the tone waveform signal which is different from that achieved by each other of the plural kinds of functions;
• the waveform processing means comprises a plurality of circuits;
• and
• the plural processings performed by the waveform processing means by the time division multiplexing operation are performed using common circuits.