In this paper, the author mainly discusses that SNR at the high frequency end is reduces due to(So/No) FM proportionates to 1/w~2. This is not permitted in communications. To solve the problem the deemphasis and preemphasis technologies are adopted.
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黄慎和.论“去加重,预加重”技术[J].重庆工商大学学报(自然科学版),1990,(4): Huang Shenhe. On "Deemphasis and Preemphasis" Techniques[J]. Journal of Chongqing Technology and Business University(Natural Science Edition),1990,(4):