Rules for the Technical Engineering of Cable Radio and Television Systems Article 16

In every cable FM broadcasting channel, the signal quality at the subscriber terminal shall conform to the following stipulations:1. FM carrier level shall be in between –14 to +4 dBmV.2. FM carrier noise ratio in mono sound shall not be less that 25 dB and not less than 45 dB in stereo sound3. FM carrier beat level shall be 30 dB or more lower than the lowest FM carrier level4. FM carrier level shall be 3 dB or smaller than the lowest video carrier level.
中文原文 有線廣播電視系統工程技術管理辦法第16條
系統之每一有線調頻廣播頻道,在訂戶終端點之信號品質應符合下列各款之規定:
一、調頻載波位準應介於負十四分貝毫伏到正四分貝毫伏間。
二、調頻載波雜訊比在單音時不得小於二十五分貝,在立體音時不得小於四十五分貝。
三、調頻載波拍差位準必須較最低之調頻載波位準低三十分貝以上。
四、調頻載波位準必須較最低之影像載波位準小三分貝以上。

English translation for reference only; the Chinese text prevails. Not legal advice.