| 摘要 |
1. Multi-channel acoustic product - Characterized in that: It contains the data medium (20) of a mobile device and a digital data stream (16). The data stream represents an acoustic signal, sampled at the sampling speed and encoded within the basic band range divided into frequency sub-bands, and within the high sampling speed frequency range. The read data medium of a mobile device is written as a sequence of acoustic frames (186) at the transmission speed. Each acoustic frame contains the following components in the following order: the synchronisation word (192); the frame header (194), containing the window size, which indicates the number of acoustic samples in an acoustic frame; and the frame size, indicating the number of bytes in the acoustic frame, while the acoustic window size is set as a function of the ratio of the transmission speed to the sampling speed to limit the frame size not to exceed the maximum size; the acoustic header (198), which indicates the packing order and the encoding format of the acoustic frame; at least one acoustic sub-frame (188). Each acoustic sub-frame contains: contingent information (200) for decoding the acoustic sub-frame without reference to any other sub-frame; multiple acoustic sub-sub-frames (190) of the basic band, where acoustic data for each frequency sub-band of the channel are packed and multiplexed by other channels; the high sampling speed acoustic block (208), where the acoustic data from the high sampling speed frequency band of each channel are packed and multiplexed by other channels, in order to decode a multi-channel acoustic signal with multiple decoding sampling speeds; the unpacking synchroniser (210) for controlling the sub-frame end. |
