专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明申请

WO2004059901A2 METHOD AND APPARATUS FOR AM DIGITAL AUDIO BROADCASTING WITH AMPLITUDE SCALED TERTIARY SUBCARRIERS 审中-公开
标题翻译：用于AM数字音频广播的方法和设备，具有振幅缩放的第三子载波
公开(公告)号：WO2004059901A2
公开(公告)日：2004-07-15
申请号：PCT/US0340152
申请日：2003-12-08
申请人： IBIQUITY DIGITAL CORP
发明人： KROEGER BRIAN WILLIAM , JOHNSON STEVEN ANDREW
IPC分类号： H04H20/36 , H04L5/02 , H04L5/06 , H04L27/26 , H04L
CPC分类号： H04H20/36 , H04H2201/186 , H04L5/023 , H04L5/06 , H04L27/2602
摘要： A method of in-band on-channel (IBOC) digital audio broadcasting (DAB) comprises the steps of providing an analog modulated carrier signal in a central frequency band of an AM radio channel, providing a first plurality of subcarriers in an upper sideband of the AM radio channel, providing a second plurality of subcarriers in a lower sideband of the AM radio channel, providing a third plurality of subcarriers in the central frequency band of the AM radio channel, modulating the first, second and third plurality of subcarriers with one or more digitally encoded signals, and transmitting the analog modulated signal and the first, second and third plurality of subcarriers, wherein the subcarriers in the third plurality of subcarriers that are positioned closest to the center of the channel are transmitted at higher power spectral densities than the subcarriers in the third plurality of subcarriers that are positioned farther from the center of the channel. The power spectral densities of a first group of the subcarriers in the third plurality of subcarriers can decrease linearly with frequency separation from the center of the channel. Transmitters and receivers that utilize the composite IBOC DAB signal are also included.
摘要翻译：一种带内同频道（IBOC）数字音频广播（DAB）的方法包括以下步骤：在AM无线电信道的中心频带中提供模拟调制的载波信号;提供第一多个副载波， AM无线电信道，在AM无线电信道的下边带中提供第二多个副载波，在AM无线电信道的中心频带中提供第三多个副载波，以第一，第二和第三多个副载波调制一个副载波或更多的数字编码信号，并且发送模拟调制信号和第一，第二和第三多个副载波，其中位于最靠近信道中心的第三多个副载波中的副载波以比功率更高的频谱密度位于远离信道中心的第三多个子载波中的子载波。第三多个副载波中的第一组副载波的功率谱密度可随着与信道中心的频率间隔线性地减小。还包括利用复合IBOC DAB信号的发射机和接收机。

IPRDB

热门服务

关于我们

友情链接

联系方式