Mixing device, mixing method, and non-transitory computer-readable recording medium

A mixing method of a first signal and a second signal on a time-frequency plane, the mixing method comprising:

• generating a control signal indicating whether to perform prioritized mixing that includes amplification of the first signal and attenuation of the second signal, the control signal taking at least a first value and a second value different from the first value, wherein the first value is not continuous beyond a predetermined bandwidth on a frequency axis;
• deriving a first gain for amplifying the first signal and a second gain for attenuating the second signal based on the control signal;
• and
• applying the prioritized mixing to the first signal and the second signal in response to the control signal indicating the first value, and applying simple addition to the first signal and the second signal in response to the control signal indicating the second value,
• wherein the generating a control signal includes:
• performing first frequency processing with respect to an intensity of the first signal on the time-frequency plane, to obtain a first spectrum representing an absolute amount of the first signal,
• performing second frequency processing with respect to the first spectrum, to obtain a second spectrum indicating local changes of the first spectrum, and
• generating the control signal based on the first spectrum and the second spectrum.

A non-transitory computer-readable recording medium having computer-readable instructions stored thereon, which when executed, causes a computer to execute a mixing process of a first signal and a second signal on a time-frequency plane, the mixing process comprising:

• generating a control signal indicating whether to perform prioritized mixing that includes amplification of the first signal and attenuation of the second signal, the control signal taking at least a first value and a second value different from the first value, wherein the first value is not continuous beyond a predetermined bandwidth on a frequency axis;
• deriving a first gain for amplifying the first signal and a second gain for attenuating the second signal based on the control signal;
• and
• applying the prioritized mixing to the first signal and the second signal in response to the control signal indicating the first value, and applying simple addition to the first signal and the second signal in response to the control signal indicating the second value,
• wherein the generating a control signal includes:
• performing first frequency processing with respect to an intensity of the first signal on the time-frequency plane, to obtain a first spectrum representing an absolute amount of the first signal,
• performing second frequency processing with respect to the first spectrum, to obtain a second spectrum indicating local changes of the first spectrum, and
• generating the control signal based on the first spectrum and the second spectrum.