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11.发明授权Systems and methods for recovery of a sub-carrier signal from a stereophonic multiplexed signal 有权用于从立体声复用信号中恢复副载波信号的系统和方法公开(公告)号：US08260238B1
公开(公告)日：2012-09-04
申请号：US12696558
申请日：2010-01-29
申请人： Chris Cheng-Chieh Lee , Hui-Ling Lou , Jungwon Lee
发明人： Chris Cheng-Chieh Lee , Hui-Ling Lou , Jungwon Lee
IPC分类号： H04B7/00
CPC分类号： H04B1/1653 , H04H40/45
摘要： Disclosed herein are systems and methods for recovering a sub-carrier signal from a multiplexed signal having an embedded pilot tone signal. The recovery system includes circuitry for recovering a pilot signal from the received multiplexed signal, for generating a frequency-doubled signal from the recovered pilot signal, and for phase-shifting the frequency-doubled signal by a pre-determined phase difference from the embedded pilot tone signal. Another recovery system includes circuitry for recovering a pilot signal from the received multiplexed signal, for phase-shifting the pilot signal by a pre-determined phase difference from the embedded pilot tone signal, and for generating a frequency-doubled signal from the phase-shifted signal.
摘要翻译： 这里公开了用于从具有嵌入导频音信号的复用信号中恢复副载波信号的系统和方法。 恢复系统包括用于从所接收的多路复用信号中恢复导频信号的电路，用于从恢复的导频信号产生加倍频的信号，并且将加倍频信号与嵌入式导频相移预定的相位差 音调信号。 另一个恢复系统包括用于从接收到的多路复用信号中恢复导频信号的电路，用于将导频信号与嵌入的导频音信号相位相移预定的相位差，并用于从相移 信号。
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公开(公告)号：US08081942B1
公开(公告)日：2011-12-20
申请号：US12152675
申请日：2008-05-14
IPC分类号： H04B1/16
CPC分类号： H04B1/1027 , H04H40/72
摘要： A constant modulus indicator (CMI) measure is calculated for a received signal having a constant modulus component C and a noise component N. The CMI measure indicates a ratio of an energy of C to an energy of N. A determination of whether to attenuate a derived signal is made based on the CMI measure, wherein the derived signal is generated from the received signal. The derived signal is attenuated based on the determination.
摘要翻译： 对于具有恒模分量C和噪声分量N的接收信号，计算恒模指标（CMI）测量.CMI测量指示C的能量与N的能量的比。确定是否衰减 基于CMI测量进行导出信号，其中从所接收的信号产生导出的信号。 导出的信号根据确定被衰减。
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13.发明授权Systems and methods for I/Q imbalance correction and calibration of variable modulus signals 有权用于I / Q不平衡校正和可变模数信号校准的系统和方法公开(公告)号：US08064542B1
公开(公告)日：2011-11-22
申请号：US11519370
申请日：2006-09-11
IPC分类号： H04L27/00
CPC分类号： H04L27/0014 , H03D3/009 , H03D2200/0045 , H03D2200/0082 , H04L2027/0016 , H04L2027/0028
摘要： Disclosed herein are systems and methods for accurate removal of I/Q mismatch in received signals of an analog FM receiver. The analog FM receiver includes a down-converter, a calibration circuit that estimates I/Q mismatch values, and a compensation circuit that uses the estimated mismatch values to reduce the effects of I/Q mismatch. In one aspect, the calibration circuit uses an adaptive dual-parameter compensation scheme to iteratively correct the received signals by approximating a coefficient value and an amplitude value that minimize the signals' amplitude variation from the amplitude value. In another aspect, phase and amplitude mismatch parameters can be determined using the coefficient value.
摘要翻译： 这里公开了用于精确地去除模拟FM接收机的接收信号中的I / Q失配的系统和方法。 模拟FM接收机包括一个下变频器，一个估计I / Q不匹配值的校准电路，以及一个使用估计的失配值来减少I / Q失配影响的补偿电路。 在一个方面，校准电路使用自适应双参数补偿方案，通过近似系数值和使信号的振幅变化与振幅值最小化的振幅值来迭代校正接收信号。 在另一方面，可以使用系数值来确定相位和幅度失配参数。
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公开(公告)号：US07706312B1
公开(公告)日：2010-04-27
申请号：US11752264
申请日：2007-05-22
IPC分类号： H04B7/00
CPC分类号： H03D3/006 , H04B1/1646
摘要： In an apparatus for generating a synchronized sub-carrier signal based on a pilot signal, a zero-crossing detector may detect a pilot signal zero-crossing in response to consecutive pilot signal samples. In response to the zero-crossing detector, a sub-carrier signal phase sampler generates a sequence of sub-carrier phase samples at a sampling frequency, inclining a first sub-carrier signal phase sample and additional sub-carrier signal phase samples at predetermined phase sample intervals. A phase sample counter counts the number of phase samples obtained by the sub-carrier signal phase sampler. A sub-carrier signal generator generates a synchronized sub-carrier signal in response to the sub-carrier signal phase samples. In response to the zero-crossing detector and the phase sample counter, a post-zero-crossing sub-carrier phase computation circuit outputs to the sub-carrier signal phase sampler an expected phase of a post-zero-crossing pilot signal phase sample in response to a premature pilot signal zero-crossing and an adjusted post-zero-crossing sub-carrier signal phase sample in response to a detected pilot signal zero crossing.
摘要翻译： 在用于基于导频信号产生同步的副载波信号的装置中，过零检测器可以响应于连续的导频信号采样来检测导频信号过零。 响应于过零检测器，副载波信号相位采样器以采样频率生成子载波相位采样序列，将第一副载波信号相位采样和附加子载波信号相位采样倾斜到预定相位 采样间隔。 相位采样计数器对由副载波信号相位采样器获得的相位采样数进行计数。 副载波信号发生器响应于副载波信号相位采样产生同步的副载波信号。 响应于过零检测器和相位采样计数器，过零后的副载波相位计算电路向副载波信号相位采样器输出过零后交叉导频信号相位采样的预期相位 响应于检测到的导频信号过零，响应过早的导频信号过零点和经调整的过零后的副载波信号相位采样。
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15.发明授权System and method for detecting rated maximum system deviation (RMSD) and alleviating RMSD mismatch 有权用于检测额定最大系统偏差（RMSD）和减轻RMSD失配的系统和方法公开(公告)号：US09356638B1
公开(公告)日：2016-05-31
申请号：US13618082
申请日：2012-09-14
CPC分类号： H04B1/1653 , H04B1/1646 , H04H40/45 , H04H40/72 , H04H40/81 , H04R29/00 , H04S7/301
摘要： An FM audio receiver can include a mono/stereo detector that causes the audio receiver to output either a monophonic or a stereophonic signal based on a received pilot tone energy. An accurate operation of the receiver, including but not limited to correct decoding of monophonic/stereophonic reception, can be based on the receiver operating with the same rated maximum system deviation (RMSD) as the received signal itself. Aspects of the disclosure describe a system and method of detecting and matching a receiver's RMSD to that of a received signal by demodulating a carrier bearing a an input signal over a first bandwidth, extracting a pilot energy signal from the input signal, and demodulating the carrier bearing the input signal over a second bandwidth if the pilot energy signal is within a pilot energy range for a first predetermined amount of time.
摘要翻译： FM音频接收器可以包括单声道/立体声检测器，其使得音频接收器基于接收到的导频音能量输出单声道或立体声信号。 接收机的精确操作，包括但不限于单声道/立体声接收的正确解码，可以基于接收器以与接收信号本身相同的额定最大系统偏差（RMSD）来操作。 本公开的方面描述了通过在第一带宽上解调承载输入信号的载波来检测和接收接收机的RMSD与接收信号的RMSD相匹配的系统和方法，从输入信号中提取导频能量信号，并解调载波 如果导频能量信号在第一预定时间量内的导频能量范围内，则承载输入信号在第二带宽上。
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16.发明授权Systems and methods for I/Q imbalance correction and calibration of variable modulus signals 有权用于I / Q不平衡校正和可变模数信号校准的系统和方法公开(公告)号：US08792591B1
公开(公告)日：2014-07-29
申请号：US13288403
申请日：2011-11-03
IPC分类号： H04L27/00
CPC分类号： H04L27/0014 , H03D3/009 , H03D2200/0045 , H03D2200/0082 , H04L2027/0016 , H04L2027/0028
摘要： Disclosed herein are systems and methods for accurate removal of I/Q mismatch in received signals of an analog FM receiver. The analog FM receiver includes a down-converter, a calibration circuit that estimates I/Q mismatch values, and a compensation circuit that uses the estimated mismatch values to reduce the effects of I/Q mismatch. In one aspect, the calibration circuit uses an adaptive dual-parameter compensation scheme to iteratively correct the received signals by approximating a coefficient value and an amplitude value that minimize the signals' amplitude variation from the amplitude value. In another aspect, phase and amplitude mismatch parameters can be determined using the coefficient value.
摘要翻译： 这里公开了用于精确地去除模拟FM接收机的接收信号中的I / Q失配的系统和方法。 模拟FM接收机包括一个下变频器，一个估计I / Q不匹配值的校准电路，以及一个使用估计的失配值来减少I / Q失配影响的补偿电路。 在一个方面，校准电路使用自适应双参数补偿方案，通过近似系数值和使信号的振幅变化与振幅值最小化的振幅值来迭代校正接收信号。 在另一方面，可以使用系数值来确定相位和幅度失配参数。
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公开(公告)号：US08315568B1
公开(公告)日：2012-11-20
申请号：US13345650
申请日：2012-01-06
IPC分类号： H04B1/16
CPC分类号： H04L27/2334 , H04B1/1653 , H04H20/34 , H04H40/18 , H04H2201/13
摘要： Methods and apparatus are provided for receiving a first signal and generating an output signal indicative of radio data system (“RDS”) information. A receiver circuit of the invention can include mixer circuitry, lowpass filter circuitry, downsampler circuitry, and decoder circuitry. Advantageously, the receiver circuit can operate entirely within the digital domain, promoting interoperability with digital frequency modulation (“FM”) demodulator circuitry.
摘要翻译： 提供了用于接收第一信号并产生指示无线电数据系统（RDS）信息的输出信号的方法和装置。 本发明的接收机电路可以包括混频器电路，低通滤波器电路，下采样器电路和解码器电路。 有利地，接收器电路可以完全在数字域内操作，促进与数字频率调制（FM）解调器电路的互操作性。
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18.发明授权System and method for detecting rated maximum system deviation (RMSD) and alleviating RMSD mismatch 有权用于检测额定最大系统偏差（RMSD）和减轻RMSD失配的系统和方法公开(公告)号：US08295495B1
公开(公告)日：2012-10-23
申请号：US11871773
申请日：2007-10-12
IPC分类号： H04H40/81 , H04H20/47 , H04H20/88 , H04H40/36 , H04H40/54 , H04H40/72 , H04B1/10 , H04B1/06 , H04B7/00 , H04B1/16
CPC分类号： H04B1/1653 , H04B1/1646 , H04H40/45 , H04H40/72 , H04H40/81 , H04R29/00 , H04S7/301
摘要： An FM audio receiver can include a mono/stereo detector that causes the audio receiver to output either a monophonic or a stereophonic signal based on a received pilot tone energy. An accurate operation of the receiver, including but not limited to correct decoding of monophonic/stereophonic reception, can be based on the receiver operating with the same rated maximum system deviation (RMSD) as the received signal itself. Aspects of the disclosure describe a system and method of detecting and matching a receiver's RMSD to that of a received signal by demodulating a carrier bearing a an input signal over a first bandwidth, extracting a pilot energy signal from the input signal, and demodulating the carrier bearing the input signal over a second bandwidth if the pilot energy signal is within a pilot energy range for a first predetermined amount of time.
摘要翻译： FM音频接收器可以包括单声道/立体声检测器，其使得音频接收器基于接收到的导频音能量输出单声道或立体声信号。 接收机的精确操作，包括但不限于单声道/立体声接收的正确解码，可以基于接收器以与接收信号本身相同的额定最大系统偏差（RMSD）来操作。 本公开的方面描述了通过在第一带宽上解调承载输入信号的载波来检测和接收接收机的RMSD与接收信号的RMSD相匹配的系统和方法，从输入信号中提取导频能量信号，并解调载波 如果导频能量信号在第一预定时间量内的导频能量范围内，则承载输入信号在第二带宽上。
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19.发明授权System and method for estimating channel condition based on filtered pilot energy signal 有权基于滤波导频能量信号估计信道条件的系统和方法公开(公告)号：US08139772B1
公开(公告)日：2012-03-20
申请号：US11871777
申请日：2007-10-12
CPC分类号： H04B1/1653 , H04B1/1646 , H04H40/45 , H04H40/72 , H04H40/81 , H04R29/00 , H04S7/301
摘要： A receiver may estimate a channel condition based on a difference between a pilot energy signal and a filtered pilot energy signal. The receiver may further switch to a stereophonic mode when both the difference and an energy level of the pilot energy signal satisfy a predetermined requirement of the receiver, and switch to a monophonic mode when either the difference or the energy level of the pilot energy signal fail to satisfy the predetermined requirement of the receiver.
摘要翻译： 接收机可以基于导频能量信号和滤波的导频能量信号之间的差来估计信道状况。 当导频能量信号的差异和能量水平都满足接收机的预定要求时，接收机可以进一步切换到立体声模式，并且当导频能量信号的差值或能量级别失败时，接收机可以切换到单声道模式 以满足接收机的预定要求。
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公开(公告)号：US07729679B1
公开(公告)日：2010-06-01
申请号：US11752261
申请日：2007-05-22
CPC分类号： H04B1/1027
摘要： In an apparatus, method, and system for reducing interference with an input signal to an FM receiver, a plurality of inputs are filtered by a first stage of filters. The outputs are received by an interference detector and further processed by a second filtering stage, an energy calculation stage, and a comparator stage. A switch, responsive to the outputs of the comparator stage, may output one of the first stage filter outputs based on a first set of comparator outputs and may output an interpolated value determined by the first stage filter outputs and based on a second set of comparator outputs.
摘要翻译： 在用于减少对FM接收机的输入信号的干扰的装置，方法和系统中，多个输入被第一级滤波器滤波。 输出由干扰检测器接收，并由第二滤波级，能量计算级和比较级进一步处理。 响应于比较器级的输出的开关可以基于第一组比较器输出输出第一级滤波器输出中的一个，并且可以输出由第一级滤波器输出确定的内插值，并且基于第二组比较器 输出。
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