| 摘要 |
<p>Au audio encoding method of coding audio signals into a layered data stream having a first layer and a second layer is presented. The second layer serves as an enhancement of the first layer. The method involves forming an original digital audio signal (300), encoding the original signal to obtain a first layer signal (310), producing a residual signal (336) to reflect a difference between the original signal and the first layer signal, selecting either the original signal or the residual signal for encoding, and producing a second layer signal by encoding the selected signal. Moreover, the residual signal (336) is evaluated and, in case the result of the evaluation meets given criteria, a predetermined low-entropy signal si selected to be encoded as the second layer signal, instead of the original signal or the residual signal.</p> |
