DIGITAL VOICE PROCESSING DEVICE, DIGITAL VOICE PROCESSING METHOD, AND DIGITAL VOICE PROCESSING PROGRAM

摘要

To provide a digital voice processing device causing no deterioration of sound quality when processing digital voice signal of a single sine wave.SOLUTION: An extreme value calculator 11 detects maximum and minimum samples of the digital audio signal. A sample number detection unit 12 detects the sample interval between the maximum sample and the minimum sample. A difference value calculation unit 13 calculates the difference value between adjacent samples. A correction value calculation unit 14 calculates first and second correction values obtained by multiplying the difference value between the maximum sample and the first adjacent sample and the difference value between the minimum sample and the second adjacent sample by a coefficient. An addition/subtraction unit 15 adds the first correction value to the first adjacent sample, and subtracts the second correction value from the second adjacent sample. A digital voice processing device is constituted so as not to add the first correction value to the first adjacent sample, and not to subtract the second correction value from the second adjacent sample, when a periodic signal detection unit 16 detects that the digital voice signal is a single sine wave.SELECTED DRAWING: Figure 1