| 摘要 |
Provided is an audio decoding device which can adjust the high-range emphasis degree in accordance with a background noise level. The audio decoding device includes: a sound source signal decoding unit (204) which performs a decoding process by using sound source encoding data separated by a separation unit (201) so as to obtain a sound source signal; an LPC synthesis filter (205) which performs an LPC synthesis filtering process by using a sound source signal and an LPC generated by an LPC decoding unit (203) so as to obtain a decoded sound signal; a mode judging unit (207) which determines whether a decoded sound signal is a stationary noise section by using a decoded LSP inputted from the LPC decoding unit (203); a power calculation unit (206) which calculates the power of the decoded audio signal; an SNR calculation unit (208) which calculates an SNR of the decoded audio signal by using the power of the decoded audio signal and a mode judgment result in the mode judgment unit (207); and a post filter (209) which performs a post filtering process by using the SNR of the decoded audio signal. |
