Musical tone waveform signal generating apparatus

A musical tone waveform signal generating apparatus in which a waveform signal is circulated to generate a musical tone waveform signal, the apparatus including:

• means for producing a control signal for excitation of the waveform signal;
• an excitation portion having (a) means for mixing the control signal with the circulating waveform signal, (b) a non-linear conversion means for non-linearly converting the mixed waveform signal and (c) a filter disposed between said mixing means and said non-linear conversion means for filtering an output of the mixing means;
• and
• a signal transmission portion coupled with said excitation portion to feed back the converted waveform signal to said excitation portion with a delay of a predetermined time for causing the waveform signal to have a resonance frequency corresponding to a pitch of a musical tone to be generated.

A musical tone waveform signal generating apparatus in which a waveform signal is circulated in a loop to generate a musical tone waveform signal, the apparatus including:

• means for producing a control signal;
• an excitation portion having means for mixing the control signal with the waveform signal and a non-linear converter for non-linearly converting the circulating waveform signal by performing calculation of a predetermined non-linear function;
• and
• a signal transmission portion coupled with said excitation portion to feed back the converted waveform signal to said excitation portion with a delay of a predetermined time for causing the circulated waveform signal to have a resonance frequency corresponding to a pitch of a musical tone to be generated.

A musical tone waveform signal generating apparatus in which a waveform signal is circulated to generate a musical tone waveform signal, the apparatus comprising:

• means for producing a first control signal for excitation of the waveform signal and a second control signal for control of a tone color;
• an excitation portion having means for mixing the first control signal with the waveform signal and a non-linear conversion means for converting the waveform signal in accordance with a non-linear function;
• a signal transmission portion coupled with said excitation portion to feed back the converted waveform signal to said excitation portion with delay of a predetermined time for causing the converted waveform signal to have a resonance frequency corresponding to a pitch of a musical tone to be generated;
• and
• means for adding the second control signal to the waveform signal prior to non-linear conversion thereof.

A musical tone waveform signal generating apparatus in which a waveform signal is circulated to generate a musical tone waveform signal, the apparatus comprising:

• means for producing a control signal for excitation of the waveform signal and for producing an attack signal at an initial stage of generation of a tone waveform;
• an excitation portion having means for mixing the control signal with the waveform signal and a non-linear conversion means for converting the waveform signal in accordance with a non-linear function;
• a signal transmission portion coupled with said excitation portion to feed back the converted waveform signal to said excitation portion with a delay of a predetermined time for causing the converted waveform signal to have a resonance frequency corresponding to a pitch of a musical tone to be generated;
• and
• means for mixing the attack signal with the control signal and for applying the mixed control signal to said excitation portion.