DECODING DEVICE

摘要

PROBLEM TO BE SOLVED: To perform a frequency equalizing process for encoded data of the MPEG2-AAC system according to a listener's liking with small memory capacity and a small arithmetic quantity. SOLUTION: When a bit stream of audio is inputted, a grouping spectrum signal extracting means 200 extracts a spectrum signal and a scale factor extracting means 210 extracts scale factors by frequency groups. Scale factor adjusting means 220a, 220b... adjust the scale factors extracted by the scale factor extracting means 210 according to a listener's liking. Spectrum signal amplifying means 230a, 230b... amplify the spectrum signal according to the adjusted scale factors. Then a converting means 240 converts the amplified spectrum signal into a time-base signal to output a PCM audio signal.