| 摘要 |
In a digital-data processing unit provided by the present invention, the level of 1-bit digital audio data resulting from DELTA-SIGMA modulation is adjusted by means of a multiplier (13). A digital audio data signal with the level thereof adjusted then undergoes DELTA-SIGMA modulation carried out by a low-pass DELTA-SIGMA modulator (14). As a result, digital audio signal with the word length thereof restored to its original value is obtained. In this case, high-frequency, noise included in the digital audio data is removed. <IMAGE> |
