Method and device for flattening power of musical sound signal, and method and device for detecting beat timing of musical piece

An information processing device, comprising:

• a control part performing a process of determining a second value corresponding to each of a plurality of first values indicating power at a plurality of time points of a musical sound signal based on a result of comparison between a present value of the first value and a present value of the second value, and a process of flattening the plurality of first values or a process of reducing the difference of the plurality of first values by using the second value corresponding to each of the plurality of first values,
• wherein the second value changes by drawing a predetermined trajectory when a state where the present value of the second value is larger than the present value of the first value continues in the result of comparison.

A device for detecting a beat timing of a musical piece, comprising:

• a control part performing a process of determining a second value corresponding to each of a plurality of first values indicating power at a plurality of time points of a musical sound signal of the musical piece based on a result of comparison between a present value of the first value and a present value of the second value, a process of flattening the plurality of first values or a process of reducing the difference of the plurality of first values by using a plurality of second values corresponding to the plurality of first values, and a process of detecting the beat timing using the plurality of first values that is flattened or that the difference of the plurality of first values is reduced,
• wherein the second value changes by drawing a predetermined trajectory when a state where the present value of the second value is larger than the present value of the first value continues in the result of comparison.