An audio signal amplification device comprising: a delta-sigma modulation part configured to resample an input digital audio signal with a quantization number smaller than a quantization number of the input digital audio signal; a pulse-width modulation part configured to convert an output signal from the delta-sigma modulation part into a pulse-width modulation signal which sets a gradation of the output signal in an amplitude direction at a gradation of a pulse width; a power amplification part configured to perform power amplification on an output signal from the pulse-width modulation part; a low-pass filter configured to diminish a component whose frequency is higher than a predetermined cutoff frequency, in an output signal from the power amplification part, and to output the resultant signal; and a correction processing part configured to generate a correction signal for correcting one of a frequency-amplitude characteristic and a frequency-phase characteristic of the input digital audio signal based on a measurement signal having an impulse characteristic, wherein the correction processing part includes a switch configured to control coupling of the correction processing part to an output of the low-pass filter, a response signal measurement part configured to measure an output signal from the low-pass filter, a correction part configured to generate the correction signal, based on a result of the measurement by the response signal measurement part; and a synthesis part configured to store the correction signal and to synthesize the stored correction signal with the input digital audio signal; and wherein, if the switch is on, the correction processing part and a loudspeaker are coupled to the output of the low-pass filter, the delta-sigma modulation part receives the measurement signal having an impulse characteristic, and wherein, if the correction processing part completes processing of generating of the correction signal, the audio amplification device turns the switch off. a delta-sigma modulation part configured to resample an input digital audio signal with a quantization number smaller than a quantization number of the input digital audio signal; a pulse-width modulation part configured to convert an output signal from the delta-sigma modulation part into a pulse-width modulation signal which sets a gradation of the output signal in an amplitude direction at a gradation of a pulse width; a power amplification part configured to perform power amplification on an output signal from the pulse-width modulation part; a low-pass filter configured to diminish a component whose frequency is higher than a predetermined cutoff frequency, in an output signal from the power amplification part, and to output the resultant signal; and a correction processing part configured to generate a correction signal for correcting one of a frequency-amplitude characteristic and a frequency-phase characteristic of the input digital audio signal based on a measurement signal having an impulse characteristic, wherein the correction processing part includes a switch configured to control coupling of the correction processing part to an output of the low-pass filter, a response signal measurement part configured to measure an output signal from the low-pass filter, a correction part configured to generate the correction signal, based on a result of the measurement by the response signal measurement part; and a synthesis part configured to store the correction signal and to synthesize the stored correction signal with the input digital audio signal; and wherein, if the switch is on, the correction processing part and a loudspeaker are coupled to the output of the low-pass filter, the delta-sigma modulation part receives the measurement signal having an impulse characteristic, and wherein, if the correction processing part completes processing of generating of the correction signal, the audio amplification device turns the switch off.