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本文所述传输方式,是使用12GHz频段卫星广播的一个信道频带,把高质量声音按PCM信号经时分多路进行广播,多路数字信号按正交载波调制方式,直接调制载波。这种传输方式和卫星电视广播PCM声音的传输信号格式保持兼容性,其2.048Mb/s传输速度的帧结构作为基本的一个通道。通过采用错误校正码及范围传输改善错误控制效果。这种传输方式能够进行12或16路的多路传输。试制的设备通过卫星传输实验进行了传输特性的测定和音质评价,结果表明即使在低载噪比(C/N)时也能用十分良好的声音质量确保广播覆盖面。
The transmission method described in this paper is to use a channel band of satellite broadcasting in the 12GHz band to broadcast high-quality audio by time division multiplexing according to the PCM signal. Multiple digital signals are directly modulated by orthogonal carrier modulation. This transmission method and the satellite television broadcast PCM sound transmission signal format to maintain compatibility, its 2.048Mb / s transmission rate of the frame structure as a basic one channel. Improves error control by using error correction codes and range transfers. This method of transmission can be multiplexed on 12 or 16 channels. The trial production equipment performed the transmission characteristics test and the sound quality evaluation by the satellite transmission experiment and the results show that the broadcast coverage can be ensured with very good sound quality even at a low C / N ratio.