Tone synthesizing device and method based on physical model tone generator

A tone synthesizing method comprising:

• a loop formation step of forming a loop for circulating a signal therethrough and including at least a signal delay element, a delay amount of said signal delay element being controlled in accordance with tone pitch designating information;
• and
• a driving signal generation step of generating a driving signal by modifying a loop output signal from said loop in accordance with a performance parameter and supplying the generated driving signal to said loop, said driving signal generation step including:
• a nonlinear conversion step of performing a nonlinear conversion on an input signal corresponding to the loop output signal and the performance parameter, said nonlinear conversion step switching an input-output characteristic, to be used for converting the input signal, into one of at least first and second input-output characteristics in accordance with intensity of a signal based on the loop output signal or the input signal;
• and
• a control step of restraining a period in which the input-output characteristic to be used for converting the input signal shifts from said first input-output characteristic to said second input-output characteristic from becoming shorter than a pitch period corresponding to a tone pitch designated by the pitch designating information.

A machine-readable recording medium containing a group of instructions of a program executable by a processor for synthesizing a tone, said program comprising the steps of:

• forming a loop for circulating a signal therethrough and including at least a signal delay element, a delay amount of said signal delay element being controlled in accordance with tone pitch designating information;
• and
• generating a driving signal by modifying a loop output signal from said loop in accordance with a performance parameter and supplying the generated driving signal to said loop, said step of generating a driving signal including:
• a nonlinear conversion step of performing a nonlinear conversion on an input signal corresponding to the loop output signal and the performance parameter, said nonlinear conversion step switching an input-output characteristic, to be used for converting the input signal, into one of at least first and second input-output characteristics in accordance with intensity of a signal based on the loop output signal or the input signal;
• and
• a control step of restraining a period in which the input-output characteristic to be used for converting the input signal shifts from said first input-output characteristic to said second input-output characteristic from becoming shorter than a pitch period corresponding to a tone pitch designated by the pitch designating information.

A tone synthesizing device comprising:

• a loop section including at least a signal delay element;
• a driving signal generation unit that generates a driving signal by modifying a loop output signal from said loop section in accordance with a performance parameter and supplies the generated driving signal to said loop section;
• and
• a fluctuating-signal generation section that generates a fluctuating signal containing a frequency component corresponding to the loop output signal or corresponding to the loop output signal and the performance parameter and supplies the generated fluctuating signal to said loop section, wherein a variation time length of the fluctuating signal varies in response to the loop output signal or the loop output signal and the performance parameter.

A tone synthesizing method comprising:

• a loop formation step of forming a loop for circulating a signal therethrough and including at least a signal delay element;
• a driving signal generation step of generating a driving signal by modifying a loop output signal from said loop in accordance with a performance parameter and supplying the generated driving signal to said loop;
• and
• a fluctuating-signal generation step of generating a fluctuating signal containing a frequency component corresponding to the loop output signal or corresponding to the loop output signal and the performance parameter and supplying the generated fluctuating signal to said loop, wherein a variation time length of the fluctuating signal varies in response to the loop output signal or the loop output signal and the performance parameter.

A machine-readable recording medium containing a group of instructions of a program executable by a processor for synthesizing a tone, said program comprising the steps of:

• forming a loop for circulating a signal therethrough and including at least a signal delay element;
• generating a driving signal by modifying a loop output signal from said loop in accordance with a performance parameter and supplying the generated driving signal to said loop;
• and
• generating a fluctuating signal containing a frequency component corresponding to the loop output signal or corresponding to the loop output signal and the performance parameter and supplying the generated fluctuating signal to said loop, wherein a variation time length of the fluctuating signal varies in response to the loop output signal or the loop output signal and the performance parameter.