Audio decoding method and apparatus
AssigneeFujitsu Limited
InventorsMasanao Suzuki, Miyuki Shirakawa, Yoshiteru Tsuchinaga
Life of this patent
Estimating the term…
Abstract
A decoded sound analysis unit (104) calculates, regarding the frequency-region stereo signals L(b) and R(b) decoded by the PS decoding unit (103), a second degree of similarity (109) and a second intensity difference (110) from the decoded sound signals. A spectrum correction unit (105) detects a distortion added by the parametric-stereo conversion by comparing the second degree of similarity (109) and the second intensity difference (110) calculated at the decoding side with the first degree of similarity (107) and the first intensity difference (108) calculated and transmitted from the encoding side, and corrects the spectrum of the frequency-region stereo decoded signals L(b) and R(b).
Claims20
An audio decoding method according which a first decoded sound signal and a first sound decoding auxiliary information are decoded from encoded sound data, and a second decoded sound signal is decoded on the basis of the first decoded sound signal and the first sound decoding auxiliary information, comprising:
- calculating a second sound decoding auxiliary information corresponding to the first sound decoding auxiliary information from the second decoding sound signal;
- and
- detecting, by comparing the second sound decoding auxiliary information and the first sound decoding auxiliary information, a distortion generated in a decoding process of the second decoded sound signal;
- correcting, in the second decoded sound signal, a distortion detected in the detecting of a distortion.
An audio decoding apparatus decoding a first decoded sound signal and a first sound decoding auxiliary information from encoded sound data, and decoding a second decoded sound signal on the basis of the first decoded sound signal and the first sound decoding auxiliary information, comprising:
- a decoded sound analysis unit calculating a second sound decoding auxiliary information corresponding to the first sound decoding auxiliary information from the second decoding sound signal;
- a distortion detection unit detecting, by comparing the second sound decoding auxiliary information and the first sound decoding auxiliary information, a distortion generated in a decoding process of the second decoded sound signal;
- and
- a distortion correction unit correcting, in the second decoding sound signal, a distortion detected in the distortion detection unit.
A non-transitory computer readable medium storing a program for making a computer decoding a first decoded sound signal and a first sound decoding auxiliary information from encoded sound data, and decoding a second decoded sound signal on the basis of the first decoded sound signal and the first sound decoding auxiliary information execute functions comprising:
- a decoded sound analysis function calculating a second sound decoding auxiliary information corresponding to first sound decoding auxiliary information from the second decoding sound signal;
- a distortion detection function detecting, by comparing the second sound decoding auxiliary information and the first sound decoding auxiliary information, a distortion generated in a decoding process of the second decoded sound signal;
- and
- a distortion correction function correcting, in the second decoding sound signal, a distortion detected by the distortion detection function.
Dependencies are inferred from the claim text.