| 摘要 |
<p>An expansion processor (202) has a buffer defining unit (240) for defining one of two buffers (BUF1, BUF2) as a present inverse quantization buffer and defining one of two buffers (BUF11, BUF12) as a present restoration buffer, an inverse quantization processor (246) for inversely quantizing a quantized value read for each sample from a DCT data buffer, an IDCT processor (248) for effecting an IDCT process on the inversely quantized data to restore time-domain audio data from frequency-domain data, a low-pass filter processor (250) for removing a high-frequency component from the restored audio data, and an audio data output unit (252) for outputting successive restored samples of audio data to a DAC (156) to output sound from a speaker (184).</p> |
