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在美国,SCA是辅助通信业务的简称,是经美国通信委员会批准的授权二次通信,基本过程是这样的:用一个调频广播发射机和同一个载频,以普通接收机接收一个附加的节目,同时也接收正常的节目。近年来,有关调频广播和电视广播副载波管理的新规定,为广播工作者提供了新的探索机会,对于用SCA副载波传输背景音乐、时间信号以及呼叫服务等,现在看来是很自然的事情。然而,利用SCA副载波传输技术的范围不止这些,通过SCA副载波进行数据传输
In the United States, SCA is an abbreviation of Auxiliary Communications Service and is an authorized secondary communication approved by the United States Communications Commission. The basic process is as follows: An additional program is received by a normal receiver using a FM radio transmitter and the same carrier frequency , But also receive normal programs. In recent years, the new rules on subcarrier management for FM and TV broadcasts have provided new opportunities for broadcasters to explore, and now it seems natural to transmit background music, time signals and call services using SCA subcarriers thing. However, the use of SCA subcarrier transmission techniques extends beyond these, with SCA subcarriers for data transmission