| 摘要 |
<p>A scalable decoder which does not frequently switch the band of the decoded signal even if the signal in an expanded layer in band scalable encoding disappear and does not give any strangeness or discomfort to the subjective quality. If frame disappearance does not occur, the signal is a signal (S101). However, if a high-band packet is made to disappear, the actually received signal is only a low-band packet. Therefore, the scalable decoder subjects the signal of a low-band packet to an upsample processing. As a result, a signal (S102) where the sampling rate is a wide band and only the low-frequency component is left is generated. From the signal (S103) of the (n-1)-th frame, a compensation signal (S104) is generated by hiding and passed through an HPF to extract only the high-frequency component to generate a signal (S105). The signal (S101) where only the low-frequency component is left is added to the signal (S105) where high-frequency component is left to generate a decoded signal (S106).</p> |
