公开(公告)号：US4417349A

公开(公告)日：1983-11-22

申请号：US92463

申请日：1979-11-08

申请人： Michael Hills ,  Clay Durret ,  William Von Meister

发明人： Michael Hills ,  Clay Durret ,  William Von Meister

IPC分类号： H04B14/08 ,  H04H20/34 ,  H04L25/49 ,  H04L27/10 ,  H04H5/00 ,  H04L25/03

CPC分类号： H04L27/10 ,  H04B14/08 ,  H04H20/34 ,  H04L25/4906

摘要： A system and method for transferring digital data via the sub-carrier of a commercial broadcast FM radio station. Digital data generated by an originating subscriber is shaped with substantially a raised cosine response in the time domain. The shaped signal is then pre-emphasized and used to frequency modulate (direct angle modulate) a sub-carrier. The sub-carrier in turn frequency modulates the carrier and the data is transmitted by the radio station along with its commercial program. A receiving subscriber detects the sub-carrier and decodes and displays the originated data.

摘要翻译： 一种用于经由商用广播FM无线电台的子载波传送数字数据的系统和方法。 由始发用户产生的数字数据在时域中基本上具有升余弦响应。 然后将成形信号预先强调并用于对副载波进行频率调制（直角调制）。 副载波又对载波进行频率调制，数据由无线电台与其商业程序一起发送。 接收用户检测子载波并解码并显示发起的数据。