Factor setting device and noise suppression apparatus

A noise suppression apparatus comprising:

• an index setting part that sets an exponent K that is a positive value;
• a factor setting part that sets a suppression factor variably according to the exponent K;
• and
• a noise suppression part that generates an audio signal from which a noise component is suppressed through noise suppression process of suppressing a Kth power of an amplitude of the noise component at each frequency thereof in a Kth power of an amplitude of the audio signal at each frequency thereof to a degree determined according to the suppression factor set by the factor setting part.

A machine readable storage medium for use in a computer, the medium containing program instructions executable by the computer to perform:

• a factor setting process of setting a suppression factor that indicates a degree of suppressing a Kth power of an amplitude of a noise component at each frequency thereof from a Kth power of an amplitude of an audio signal at each frequency thereof, where the exponent K is a positive value;
• and
• an index setting process of setting the exponent K,
• wherein the factor setting process sets the suppression factor variably according to the exponent K set by the index setting process.

A machine readable storage medium for use in a computer, the medium containing program instructions executable by the computer to perform:

• an index setting process of setting an exponent K that is a positive value;
• a factor setting process of setting a suppression factor variably according to the exponent K;
• and
• a noise suppression process of generating an audio signal from which a noise component is suppressed by suppressing a Kth power of an amplitude of the noise component at each frequency thereof from a Kth power of an amplitude of the audio signal at each frequency thereof to a degree determined according to the suppression factor set by the factor setting process.