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    Peak-to-average power ratio reduction for hybrid FM HD radio transmission
    2.
    发明授权
    Peak-to-average power ratio reduction for hybrid FM HD radio transmission 有权
    混合FM高清无线电传输的峰均功率比降低

    公开(公告)号：US08798196B2

    公开(公告)日：2014-08-05

    申请号：US13012847

    申请日：2011-01-25

    申请人： Brian W. Kroeger

    发明人： Brian W. Kroeger

    IPC分类号： H04K1/02

    CPC分类号： H04L27/2623

    摘要： A method includes: (a) modulating a set of subcarriers with a set of data to produce a modulated OFDM symbol vector; (b) modulating a FM carrier signal with the set of data to produce a modulated FM symbol; (c) combining the modulated OFDM symbol and the modulated FM symbol to produce a modulated hybrid symbol; (d) limiting the magnitude of the modulated hybrid symbol to produce a first limited modulated hybrid symbol; (e) demodulating the first limited modulated hybrid symbol to recover distorted QPSK constellations; (f) constraining the distorted QPSK constellations to values greater than or equal to a minimum threshold value to produce constrained QPSK constellations; (g) demodulating the modulated hybrid symbol to produce a demodulated hybrid symbol vector; (h) subtracting the demodulated FM symbol vector from the Hybrid symbol vector to produce modified OFDM symbol vector; (i) applying a mask to inactive subcarriers in the plurality of subcarriers of the OFDM symbol vector; (j) modulating an OFDM symbol vector with OFDM modulation to produce a modified modulated OFDM symbol; (k) combining the modulated OFDM symbol and the modulated FM symbol to produce a modulated hybrid symbol; and (l) outputting the modified modulated hybrid symbol.

    摘要翻译： 一种方法包括：（a）用一组数据调制一组子载波以产生经调制的OFDM符号向量; （b）用该组数据调制FM载波信号以产生经调制的FM符号; （c）组合经调制的OFDM符号和经调制的FM符号以产生调制的混合符号; （d）限制调制的混合符号的大小以产生第一有限调制混合符号; （e）解调第一有限调制混合符号以恢复失真的QPSK星座; （f）将失真的QPSK星座约束到大于或等于最小阈值的值以产生受限的QPSK星座; （g）解调调制的混合符号以产生解调的混合符号向量; （h）从混合符号向量中减去解调的FM符号向量以产生修改的OFDM符号向量; （i）对OFDM符号向量的多个子载波中的无效子载波应用掩码; （j）使用OFDM调制调制OFDM符号向量以产生修改的调制OFDM符号; （k）组合调制的OFDM符号和调制的FM符号以产生调制的混合符号; 和（l）输出修改后的调制混合符号。

    Method and apparatus for blending an audio signal in an in-band on-channel radio system
    3.
    发明授权
    Method and apparatus for blending an audio signal in an in-band on-channel radio system 有权
    用于在带内同频无线电系统中混合音频信号的方法和装置

    公开(公告)号：US07546088B2

    公开(公告)日：2009-06-09

    申请号：US10898829

    申请日：2004-07-26

    申请人： Brian W. Kroeger ,  Marek Milbar

    发明人： Brian W. Kroeger ,  Marek Milbar

    IPC分类号： H04B1/00

    CPC分类号： H04H20/30 ,  H04H40/18 ,  H04H60/11 ,  H04H60/12

    摘要： A method for processing a composite digital audio broadcast signal to mitigate intermittent interruptions in the reception of the digital audio broadcast signal, the method comprising the steps of separating an analog audio portion of the digital audio broadcast signal from a digital audio portion of the digital audio broadcast signal, detecting errors in the digital audio portion of the digital audio broadcast signal, adjusting the digital audio portion of the digital audio broadcast signal in response to errors in the digital audio portion of the digital audio broadcast signal to produce an adjusted digital audio portion, and blending the analog audio portion with the adjusted digital audio portion to produce an audio output. A receiver that performs the method is also included.

    摘要翻译： 一种用于处理复合数字音频广播信号以减轻数字音频广播信号的接收中的间歇性中断的方法，所述方法包括以下步骤：将数字音频广播信号的模拟音频部分与数字音频的数字音频部分分离 广播信号，检测数字音频广播信号的数字音频部分中的错误，响应于数字音频广播信号的数字音频部分中的错误，调整数字音频广播信号的数字音频部分，以产生经调整的数字音频部分 并且将模拟音频部分与经调整的数字音频部分混合以产生音频输出。 还包括执行该方法的接收器。

    Digital quadriphase-shift keying modulator
    5.
    发明授权
    Digital quadriphase-shift keying modulator 失效
    数字四相移键控调制器

    公开(公告)号：US5523726A

    公开(公告)日：1996-06-04

    申请号：US322833

    申请日：1994-10-13

    申请人： Brian W. Kroeger ,  Roy Stehlik

    发明人： Brian W. Kroeger ,  Roy Stehlik

    IPC分类号： H04L27/20 ,  H03C3/00 ,  H04L27/18

    CPC分类号： H04L27/2092

    摘要： A digital quadriphase-shift keying modulator is described which generates a modulated intermediate carrier frequency (IF) based on a desired number of samples for each input information bit. The design includes a ROM (or RAM) look-up table which stores digitized waveforms. The inphase and quadrature components of a complex baseband signal are translated to an IF at a multiple of the sampling rate simply by alternating the inphase and quadrature samples and alternating signs. The real IF output is produced by summing the inphase and quadrature signals.

    摘要翻译： 描述了一种数字四相移键控调制器，其基于每个输入信息比特的期望数目的样本产生调制的中间载波频率（IF）。 该设计包括存储数字化波形的ROM（或RAM）查找表。 复杂基带信号的同相和正交分量简单地通过交替相位和正交样本和交替符号而以采样率的倍数转换为IF。 实际的IF输出是通过对同相和正交信号求和来产生的。

    Clock recovery system for digital data
    6.
    发明授权
    Clock recovery system for digital data 失效
    数字数据的时钟恢复系统

    公开(公告)号：US4847874A

    公开(公告)日：1989-07-11

    申请号：US094629

    申请日：1987-09-09

    申请人： Brian W. Kroeger ,  John J. Kurtz

    发明人： Brian W. Kroeger ,  John J. Kurtz

    IPC分类号： H03L7/089 ,  H04L7/033

    CPC分类号： H04L7/033 ,  H03L7/089

    摘要： A system and method for recovering a clock signal from digital data signals which do not include a separate clock signal. The system and method detect transitions from one logic state to the other logic state in the digital data signal, and compare the time alignment of these logic state transitions to an input clock signal from a voltage controlled oscillator. A correction control signal is generated as a function of the time alignment of the digital data signal transition with the input clock signal, and applied to the oscillator to vary the frequency of the clock signal as a function of the correction control signal, whereby a digital data recovered clock signal is aligned with the digital data signal.

    摘要翻译： 一种用于从不包括单独的时钟信号的数字数据信号中恢复时钟信号的系统和方法。 系统和方法检测数字数据信号中从一个逻辑状态到另一个逻辑状态的转换，并将这些逻辑状态转换的时间对准与来自压控振荡器的输入时钟信号进行比较。 根据数字数据信号转换与输入时钟信号的时间对准产生校正控制信号，并将其施加到振荡器以根据校正控制信号改变时钟信号的频率，由此数字 数据恢复时钟信号与数字数据信号对齐。

    FM analog demodulator compatible with IBOC signals
    7.
    发明授权
    FM analog demodulator compatible with IBOC signals 有权
    FM模拟解调器兼容IBOC信号

    公开(公告)号：US09184961B2

    公开(公告)日：2015-11-10

    申请号：US13189659

    申请日：2011-07-25

    申请人： Brian W. Kroeger ,  Paul J. Peyla

    发明人： Brian W. Kroeger ,  Paul J. Peyla

    IPC分类号： H04B1/16 ,  H04L27/156

    CPC分类号： H04B1/123 ,  H04B1/1036 ,  H04B2001/1045 ,  H04L27/14 ,  H04L27/156 ,  H04L43/16

    摘要： A method includes: receiving an FM radio signal including an analog-modulated portion; digitally sampling an analog-modulated portion of the radio signal to produce a plurality of samples; using a ratio between an average magnitude and an RMS magnitude of a block of the samples to compute a signal quality metric; detecting sum and difference components of the baseband multiplex signal content; using the baseband content to produce an output signal; and blending the output signal from stereo to monaural as the signal quality metric falls below a threshold value.

    摘要翻译： 一种方法包括：接收包括模拟调制部分的FM无线电信号; 对无线电信号的模拟调制部分进行数字采样以产生多个采样; 使用样本块的平均幅度和RMS幅度之间的比率来计算信号质量度量; 检测基带复用信号内容的和差分量; 使用基带内容产生输出信号; 并且当信号质量度量低于阈值时，将来自立体声的输出信号混合到单声道。

    FM ANALOG DEMODULATOR COMPATIBLE WITH IBOC SIGNALS
    8.
    发明申请
    FM ANALOG DEMODULATOR COMPATIBLE WITH IBOC SIGNALS 有权
    FM模拟DEMODULATOR与IBOC信号兼容

    公开(公告)号：US20130029585A1

    公开(公告)日：2013-01-31

    申请号：US13189659

    申请日：2011-07-25

    申请人： Brian W. Kroeger ,  Paul J. Peyla

    发明人： Brian W. Kroeger ,  Paul J. Peyla

    IPC分类号： H04W4/00

    CPC分类号： H04B1/123 ,  H04B1/1036 ,  H04B2001/1045 ,  H04L27/14 ,  H04L27/156 ,  H04L43/16

    摘要： A method includes: receiving an FM radio signal including an analog-modulated portion; digitally sampling an analog-modulated portion of the radio signal to produce a plurality of samples; using a ratio between an average magnitude and an RMS magnitude of a block of the samples to compute a signal quality metric; detecting sum and difference components of the baseband multiplex signal content; using the baseband content to produce an output signal; and blending the output signal from stereo to monaural as the signal quality metric falls below a threshold value.

    摘要翻译： 一种方法包括：接收包括模拟调制部分的FM无线电信号; 对无线电信号的模拟调制部分进行数字采样以产生多个采样; 使用样本块的平均幅度和RMS幅度之间的比率来计算信号质量度量; 检测基带复用信号内容的和差分量; 使用基带内容产生输出信号; 并且当信号质量度量低于阈值时，将来自立体声的输出信号混合到单声道。

    Coherent track for FM IBOC receiver using a switch diversity antenna system
    10.
    发明授权
    Coherent track for FM IBOC receiver using a switch diversity antenna system 有权
    使用开关分集天线系统的FM IBOC接收机的相干轨道

    公开(公告)号：US07724850B2

    公开(公告)日：2010-05-25

    申请号：US10874681

    申请日：2004-06-23

    申请人： Brian W. Kroeger ,  Paul J. Peyla ,  Jeffrey S. Baird

    发明人： Brian W. Kroeger ,  Paul J. Peyla ,  Jeffrey S. Baird

    IPC分类号： H04B7/10

    CPC分类号： H04B7/0805 ,  H04L25/0232 ,  H04L27/261 ,  H04L27/2647

    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。