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1. 发明申请

WO2004077667A3 COHERENT AM DEMODULATOR USING A WEIGHTED LSB/USB SUM FOR INTERFERENCE MITIGATION 审中-公开
标题翻译：相干上行解调器使用加权LSB / USB总和进行干扰缓解
公开(公告)号：WO2004077667A3
公开(公告)日：2004-12-29
申请号：PCT/US2004002549
申请日：2004-01-29
申请人： IBIQUITY DIGITAL CORP
发明人： KROEGER BRIAN WILLIAM
IPC分类号： H03D1/04 , H03D1/22 , H03D1/24
CPC分类号： H03D1/2245 , H03D1/04
摘要： A method of processing an AM radio signal comprises the step of receiving an AM radio signal including an upper sideband portion and a lower sideband portion, demodulating the upper sideband portion and the lower sideband portion to produce a demodulated upper sideband signal and a demodulated lower sideband signal, weighting the demodulated upper sideband signal and the demodulated lower sideband signal in response to noise power to produce a weighted demodulated upper sideband signal and a weighted demodulated lower sideband signal, and combining the weighted demodulated upper sideband signal and the weighted demodulated lower sideband signal to produce an output signal. Demodulators which process AM radio signals in accordance with the method, and receivers incorporating the demodulators, are also included.
摘要翻译：处理AM无线电信号的方法包括接收包括上边带部分和下边带部分的AM无线信号，解调上边带部分和下边带部分以产生解调的上边带信号和解调的下边带的步骤信号，响应于噪声功率对解调的上边带信号和解调的下边带信号进行加权，以产生加权的解调的上边带信号和加权的解调的下边带信号，以及组合加权的解调的上边带信号和加权的解调的下边带信号产生输出信号。还包括根据该方法处理AM无线电信号的解调器和包含解调器的接收机。

2. 发明申请

WO2005050865A3 COHERENT TRACKING FOR FM IBOC RECEIVER USING A SWITCH DIVERSITY ANTENNA SYSTEM 审中-公开
标题翻译：使用开关多样性天线系统的FM IBOC接收机的并行跟踪
公开(公告)号：WO2005050865A3
公开(公告)日：2005-09-15
申请号：PCT/US2004037944
申请日：2004-11-12
申请人： IBIQUITY DIGITAL CORP , KROEGER BRIAN WILLIAM , PEYLA PAUL JAMES , BAIRD JEFFREY S
发明人： KROEGER BRIAN WILLIAM , PEYLA PAUL JAMES , BAIRD JEFFREY S
IPC分类号： H04B7/08 , H04L25/02 , H04L27/26
CPC分类号： H04L27/2655 , H04L25/0224 , H04L27/2675
摘要： A method is provided for coherently tracking a radio signal including a plurality of digitally modulated reference subcarriers. The method comprises the steps of receiving symbols transmitted on the reference subcarriers, combining the reference subcarrier symbols with a known reference sequence conjugate to produce a plurality of samples, median filtering the samples to produce filtered samples, and smoothing the samples for each of the reference subcarriers over the plurality of reference subcarriers to produce a coherent reference signal estimate for each of the subcarriers. A receiver for coherently tracking a radio signal including at least one digitally modulated reference carrier is also provided.
摘要翻译：提供了一种用于相干跟踪包括多个数字调制参考子载波的无线电信号的方法。该方法包括以下步骤：接收在参考子载波上发送的符号，将参考子载波符号与已知参考序列共轭相结合以产生多个样本，对样本进行中值滤波以产生滤波样本，以及平滑每个参考的样本多个参考子载波上的子载波，以产生每个子载波的相干参考信号估计。还提供了一种用于相干跟踪包括至少一个数字调制参考载波的无线电信号的接收机。

3. 发明申请

WO0197416A3 METHOD AND APPARATUS FOR REDUCTION OF INTERFERENCE IN FM IN-BAND ON-CHANNEL DIGITAL AUDIO BROADCASTING RECEIVERS 审中-公开
标题翻译：用于减少FM带内通道数字音频广播接收机的干扰的方法和装置
公开(公告)号：WO0197416A3
公开(公告)日：2002-10-10
申请号：PCT/US0117565
申请日：2001-05-31
申请人： IBIQUITY DIGITAL CORP
发明人： KROEGER BRIAN WILLIAM , BAIRD JEFFREY S
IPC分类号： H04L27/01 , H03D3/00 , H04B1/16 , H04H20/30 , H04J11/00 , H04L27/26 , H04H1/00
CPC分类号： H04L27/2647 , H03D3/007 , H04H20/30 , H04H2201/183 , H04H2201/20
摘要： This invention provides a method for reducing radio frequency interference in an FM in-band on-channel digital audio broadcasting receiver. The method comprises the steps of receiving a composite signal including a signal of interest and an interfering signal, demodulating the composite signal to produce a first demodulated signal, computing a first binary soft decision from the first demodulated signal, processing the composite signal to produce a processed signal, demodulating the processed signal to produce a second demodulated signal, computing a second binary soft decision from the second demodulated signal, and combining the first and second binary soft decisions to produce an output signal. Radio receivers that utilize the above method are also included.
摘要翻译：本发明提供了一种降低FM带内同频数字音频广播接收机中射频干扰的方法。该方法包括以下步骤：接收包括感兴趣信号和干扰信号的复合信号，解调复合信号以产生第一解调信号，从第一解调信号计算第一二进制软判决，处理复合信号以产生解调经处理的信号以产生第二解调信号，从第二解调信号计算第二二进制软判决，以及组合第一和第二二进制软判决以产生输出信号。还包括利用上述方法的无线电接收机。

4. 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。

5. 发明申请

WO0135556A3 METHOD AND APPARATUS FOR TRANSMISSION AND RECEPTION OF FM IN-BAND ON-CHANNEL DIGITAL AUDIO BROADCASTING 审中-公开
标题翻译： FM带内通道数字音频广播的传输和接收方法与装置
公开(公告)号：WO0135556A3
公开(公告)日：2001-10-04
申请号：PCT/US0042061
申请日：2000-11-10
申请人： IBIQUITY DIGITAL CORP
发明人： KROEGER BRIAN WILLIAM , BAIRD JEFFREY S
IPC分类号： H04J11/00 , H04H20/30 , H04L1/00 , H04L27/26 , H04H1/00
CPC分类号： H04L27/2613 , H04H20/30 , H04H2201/183 , H04H2201/20 , H04L1/004 , H04L5/0048 , H04L25/0226 , H04L25/0228 , H04L25/03159 , H04L27/2071 , H04L27/2655
摘要： A method for transmission of data in a digital audio broadcasting system includes the steps of providing a plurality of orthogonal frequency division multiplexed sub-carriers, with the sub-carriers including data sub-carriers and reference sub-carriers, and modulating the data sub-carriers with a digital signal representative of information to be transmitted. The reference sub-carriers are modulated with a sequence of timing bits, wherein the sequence of timing bits includes an unambiguous block synchronization word, and the number of bits comprising the block synchronization word is less than one half of the number of bits in said timing sequence. Then the orthogonal frequency division multiplexed sub-carriers are transmitted. Receivers that differentially detect the block synchronization word and use the block synchronization word to coherently detect the digital signal representative of information to be transmitted are also included.
摘要翻译：一种在数字音频广播系统中传输数据的方法包括以下步骤：提供多个正交频分多路复用子载波，子载波包括数据子载波和参考副载波，具有表示要发送的信息的数字信号的载波。参考子载波用定时位序列调制，其中定时位序列包括明确的块同步字，并且包括块同步字的比特数小于所述定时中的比特数的一半序列。然后发送正交频分复用子载波。还包括差分检测块同步字并使用块同步字相干检测表示要发送的信息的数字信号的接收器。

6. 发明申请

WO0115358A3 METHOD AND APPARATUS FOR TRANSMISSION AND RECEPTION OF COMPRESSED AUDIO FRAMES WITH PRIORITIZED MESSAGES FOR DIGITAL AUDIO BROADCASTING 审中-公开
标题翻译：用于数字音频广播的具有优先消息的压缩音频帧的传输和接收的方法和设备
公开(公告)号：WO0115358A3
公开(公告)日：2001-05-10
申请号：PCT/US0023185
申请日：2000-08-23
申请人： IBIQUITY DIGITAL CORP
发明人： KROEGER BRIAN WILLIAM , MATTSON STEPHEN DOUGLAS
IPC分类号： G10L19/00 , H03M13/15 , H04B14/04 , H04H20/46 , H04H40/27 , H04J3/00 , H04H1/00
CPC分类号： H04H20/30 , H04H2201/20
摘要： A method for transmission of compressed data for a digital audio broadcasting system comprises the steps of producing digital information representative of an audio signal; estimating the number of bits to be allocated to the digital information in a modem frame; encoding the digital information within the estimated number of bits to produce encoded data; removing selected bits from the encoded data; adding bits corresponding to digital messages to the encoded information to form a composite modem frame; formatting the composite modem frame bits to produce formatted composite modem frame bits; and transmitting the formatted composite modem frame bits. The invention also encompasses transmitters that perform the method.
摘要翻译：一种用于传输数字音频广播系统的压缩数据的方法包括以下步骤：产生表示音频信号的数字信息; 估计要在调制解调器帧中分配给数字信息的位数; 在估计的比特数内对数字信息进行编码以产生编码数据; 从编码数据中去除所选位; 将对应于数字消息的比特添加到编码信息以形成复合调制解调器帧; 格式化复合调制解调器帧位以产生格式化的复合调制解调器帧位; 并传输格式化的复合调制解调器帧位。本发明还包括执行该方法的发射机。

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