A digital audio processing device (101, 102, 103, 104) comprising: a local extremum calculator configured to calculate a local maximum and a local minimum in samples constituting an inputted digital audio signal, and to detect a local maximum sample including the local maximum and a local minimum sample including the local minimum; a number-of-sample detector configured to detect a sample interval between the local maximum sample and the local minimum sample adjacent to each other; a difference value calculator configured to calculate difference values between adjacent samples of the digital audio signal; a correction value calculator configured, when the sample interval detected by the number-of-sample detector is within a range from a predetermined minimum value to a predetermined maximum value, to calculate a first correction value by multiplying the difference value between the local maximum sample and a first adjacent sample, which is adjacent to the local maximum sample, by a predetermined coefficient, and to calculate a second correction value by multiplying the difference value between the local minimum sample and a second adjacent sample, which is adjacent to the local minimum sample, by the predetermined coefficient, the difference values being calculated by the difference value calculator; an adder/subtractor configured to add the first correction value to the first adjacent sample and to subtract the second correction value from the second adjacent sample to correct the digital audio signal and to output the corrected digital audio signal; and characterized in that the digital audio processing device (101, 102, 103, 104) further comprises: a periodic signal detector configured to detect whether the digital audio signal is a periodic signal of a single sine wave, at least based on a first difference between a latest sample interval detected by the number-of-sample detector and a sample interval which precedes the latest sample interval by two sample intervals, wherein the first correction value and the second correction value are forcibly set to 0 when the periodic signal detector detects that the digital audio signal is a periodic signal of a single sine wave. a local extremum calculator configured to calculate a local maximum and a local minimum in samples constituting an inputted digital audio signal, and to detect a local maximum sample including the local maximum and a local minimum sample including the local minimum; a number-of-sample detector configured to detect a sample interval between the local maximum sample and the local minimum sample adjacent to each other; a difference value calculator configured to calculate difference values between adjacent samples of the digital audio signal; a correction value calculator configured, when the sample interval detected by the number-of-sample detector is within a range from a predetermined minimum value to a predetermined maximum value, to calculate a first correction value by multiplying the difference value between the local maximum sample and a first adjacent sample, which is adjacent to the local maximum sample, by a predetermined coefficient, and to calculate a second correction value by multiplying the difference value between the local minimum sample and a second adjacent sample, which is adjacent to the local minimum sample, by the predetermined coefficient, the difference values being calculated by the difference value calculator; an adder/subtractor configured to add the first correction value to the first adjacent sample and to subtract the second correction value from the second adjacent sample to correct the digital audio signal and to output the corrected digital audio signal; and characterized in that the digital audio processing device (101, 102, 103, 104) further comprises: a periodic signal detector configured to detect whether the digital audio signal is a periodic signal of a single sine wave, at least based on a first difference between a latest sample interval detected by the number-of-sample detector and a sample interval which precedes the latest sample interval by two sample intervals, wherein the first correction value and the second correction value are forcibly set to 0 when the periodic signal detector detects that the digital audio signal is a periodic signal of a single sine wave. a periodic signal detector configured to detect whether the digital audio signal is a periodic signal of a single sine wave, at least based on a first difference between a latest sample interval detected by the number-of-sample detector and a sample interval which precedes the latest sample interval by two sample intervals, wherein the first correction value and the second correction value are forcibly set to 0 when the periodic signal detector detects that the digital audio signal is a periodic signal of a single sine wave.