Patent
Audio decoding device and compensation frame generation method
Hiroyuki Ehara
- 14 Jul 2005
57
TL;DR: In this article, an audio decoding device capable of improving audio quality of a decoded signal by considering the energy change of a past signal in loss compensation processing was proposed, where an energy change calculation unit (143) calculates an average energy of an audio source signal of one-pitch cycle from the end of the ACB vector outputted from an adaptive codebook (106).
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Abstract: There is disclosed an audio decoding device capable of improving audio quality of a decoded signal by considering the energy change of a past signal in loss compensation processing. In this device, an energy change calculation unit (143) calculates an average energy of an audio source signal of one-pitch cycle from the end of the ACB vector outputted from an adaptive codebook (106). Moreover, the energy change calculation unit (143) calculates a ratio of the average energy of the current sub-frame and the sub-frame immediately before and outputs the ratio to an ACB gain generation unit (135). The ACB gain generation unit (135) outputs a conceal processing ACB gain defined by the ACB gain decoded in the past or information on the energy change ratio outputted from the energy change calculation unit (143), to a multiplier (132).
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