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一、引言传统的卫星直播电视伴音多采用副载频模拟调频传送,接收机简单、便宜,缺点是鉴频噪声使高频端信噪比恶化,因伴音的副载频在此范围内,故导致信噪比降低;特别是传送
I. INTRODUCTION The traditional satellite live TV sound uses subcarrier analog FM to transmit. The receiver is simple and cheap. The disadvantage is that the frequency noise degrades the signal-to-noise ratio at the high frequency end. Because the subcarrier frequency of the sound is within this range, Resulting in a reduced signal-to-noise ratio; especially transmission