Tone production method for an electronic musical instrument

A method for producing a tone by reading a waveform memory storing a predetermined waveform by an address signal of a selected repetition frequency comprising:

• a step of multiplying the output of said waveform memory with a first parameter;
• a step of adding the multiplication product to said address signal;
• a step of reading said waveform memory by means of the output resulting from said addition;
• a step of further multiplying said multiplication product with a second parameter to produce a second multiplication product;
• a step of adding said second multiplication product to another address signal;
• a step of reading a second waveform memory by means of the address signal added with said second multiplication product,
• a tone being produced by using the output of said second waveform memory.

A method for producing a tone by reading a waveform memory storing a predetermined waveform by an address signal of a selected repetition frequency comprising:

• a step of multiplying the output of said waveform with a first parameter;
• a step of adding the multiplication product to said address signal;
• a step of reading said waveform memory by means of the output resulting from said addition;
• a step of multiplying the output of said waveform memory with a second parameter aside from said multiplication with the first parameter to produce a second multiplication product;
• a step of adding said second multiplication product to another address signal;
• a step of reading a second waveform memory by means of the address signal added with said second multiplication product,
• a tone being produced by the output of said second waveform memory.

A method for producing a tone comprising:

• a step of multiplying outputs of a plurality of waveform memories with predetermined parameters;
• a step of adding the multiplication product to address signals for corresponding ones of said waveform memories for reading said waveform memories;
• a step of adding the outputs of said waveform memories to another address signal;
• and
• a step of reading another waveform memory different from said waveform memories by said other address signal added with the outputs of said waveform memories,
• a tone being produced by the output of said other waveform memory.

A method for producing a tone by reading a waveform memory storing a predetermined waveform by an address signal of a selected repetition frequency comprising:

• a step of multiplying the output of said waveform memory with a parameter;
• a step of adding the multiplication product to said address signal;
• a step of reading said waveform meory by means of the output resulting from said addition;
• and
• a step of sequentially calculating a mean value of amplitudes at two sample points adjacent to each other of a tone waveform read from said waveform memory.