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21. 发明申请

US20130279700A1 Undetectable Combining of Nonaligned Concurrent Signals 有权
公开(公告)号：US20130279700A1
公开(公告)日：2013-10-24
申请号：US13452864
申请日：2012-04-21
申请人： John Elliott Whitecar , Trudy D Stetzler
发明人： John Elliott Whitecar , Trudy D Stetzler
IPC分类号： H04H20/48 , H04B15/00
CPC分类号： G10L19/008 , H04H20/22 , H04H60/12
摘要： The approach shown provides for an efficient implementation of time response, level response and frequency response alignment between two audio sources such as DAB and FM that may be time offset from each other by as much as 2 seconds, and produces an aurally undetectable transition between the sources. Computational load is significantly reduced over the approaches known in the prior art.

22. 发明申请

US20120320953A1 Increasing Computational Efficiency in Digital/Analog Radios 审中-公开
标题翻译：提高数字/模拟无线电的计算效率
公开(公告)号：US20120320953A1
公开(公告)日：2012-12-20
申请号：US13159704
申请日：2011-06-14
申请人： Trudy D. Stetzler , John Elliott Whitecar
发明人： Trudy D. Stetzler , John Elliott Whitecar
IPC分类号： H04L27/00
CPC分类号： H04L27/0002 , H04B1/1027 , H04B1/406
摘要： An embodiment of the invention provides a method for increasing computational efficiency in a system that can receive an analog radio signal and a digital radio signal concurrently. One tuner is tuned to an analog frequency and the source of the output of the radio during this time is analog. When a digital radio signal is detected, acquired and the quality of the digital radio signal is above an upper threshold, a digital data path is activated and the analog data path is inactivated. At this time, the source of the output of the radio is digital. The quality of the digital radio signal continues to be monitored. When the quality of the digital radio signal falls below a lower threshold, the analog data path is activated and the digital data path is inactivated. During this time, the source of the output of the radio is analog.
摘要翻译：本发明的实施例提供了一种用于提高可以同时接收模拟无线电信号和数字无线电信号的系统中的计算效率的方法。一个调谐器被调谐到模拟频率，在此期间无线电的输出源是模拟的。当检测到数字无线电信号时，获取数字无线电信号的质量并且数字无线电信号的质量高于上限阈值，数字数据路径被激活并且模拟数据路径被停用。这时，无线电的输出源是数字的。继续监视数字无线电信号的质量。当数字无线电信号的质量下降到低于阈值时，模拟数据路径被激活，并且数字数据路径被停用。在此期间，无线电的输出源是模拟的。

23. 发明授权

US06914987B2 Audio amplifier with voltage limiting in response to spectral content 失效
标题翻译：具有响应频谱含量的电压限制的音频放大器
公开(公告)号：US06914987B2
公开(公告)日：2005-07-05
申请号：US10034239
申请日：2001-12-19
申请人： Henry Francis Blind , John Elliott Whitecar
发明人： Henry Francis Blind , John Elliott Whitecar
IPC分类号： H03G7/06 , H04H5/00 , H03F21/00
CPC分类号： H03G7/06
摘要： Audio signals are reproduced with consistent perception of total harmonic distortion even with varying spectral content of a particular audio signal without separately limiting different frequency bands within the audio signal. A distortion threshold representative of an amount of distortion to be allowed to be introduced by a power amplifier is determined in response to a frequency content of the audio signal. A distortion trigger compares a measured average distortion signal and the distortion threshold and reduces the controllable gain of the amplifier if the average distortion signal exceeds the distortion threshold.
摘要翻译：即使在特定音频信号的频谱含量变化的情况下，音频信号仍然具有一致的总谐波失真感觉，而不需要分别限制音频信号内的不同频带。响应于音频信号的频率内容来确定表示功率放大器允许引入的失真量的失真阈值。如果平均失真信号超过失真阈值，失真触发将测得的平均失真信号和失真阈值进行比较，并降低放大器的可控增益。

24. 发明授权

US06173166B2 Detection and correction of multipath in an FM receiver 失效
标题翻译： FM接收机中多路径的检测和校正
公开(公告)号：US06173166B2
公开(公告)日：2001-01-09
申请号：US09106330
申请日：1998-06-29
申请人： John Elliott Whitecar
发明人： John Elliott Whitecar
IPC分类号： H04Q720
CPC分类号： H04B1/1081 , H04B7/005
摘要： An FM radio receiver predicts the onset of a multipath event based on a derivative of a noise detection signal and then further monitors the multipath event as it progresses. During multipath, an audio output pans between a normal signal path and a multipath smoothed signal path which includes a multipath smoothing filter. If multipath distortion is present long enough, the mixer pans completely over to the smoothing filter path. If the event is weak, only partial panning takes place and mixing is restored to the normal signal path.
摘要翻译： FM无线电接收机基于噪声检测信号的导数预测多径事件的发生，然后在进程时进一步监视多径事件。在多路径期间，音频输出平移在正常信号路径和包括多径平滑滤波器的多径平滑信号路径之间。如果多径失真存在足够长的时间，则混合器将完全平移到平滑滤波器路径。如果事件较弱，则仅进行部分平移，并将混合恢复到正常信号路径。

25. 发明授权

US08666346B1 Robust FM modulation detector using signal autocorrelation 有权
标题翻译：使用信号自相关的鲁棒FM调制检测器
公开(公告)号：US08666346B1
公开(公告)日：2014-03-04
申请号：US13594506
申请日：2012-08-24
申请人： Sira Parasurama Rao , John Elliott Whitecar
发明人： Sira Parasurama Rao , John Elliott Whitecar
IPC分类号： H04B1/16
CPC分类号： H04L25/022 , H03D3/00 , H04B1/1646 , H04H40/72
摘要： An FM receiver is unaware of the modulation level (frequency deviation) of the signal and has to make an estimate of it, or some reasonable time-average of it, and accordingly set the input filter's bandwidth. We calculate modulation by measuring the autocorrelation of the recovered audio signal instead of its peaks, and then applying a peakhold detector. Since FM noise can be modeled to be somewhat uncorrelated, we can expect to get an accurate estimate of signal power while rejecting noise power substantially if we measure a one-sample delayed autocorrelation estimate. Since the above measurement is alike a power measurement, we compute its square root, gain adjust it to obtain a cleaner peak measurement, and then track these clean peaks using a leaky integrator. This gives an estimate of modulation that subdues the effect of the noise.
摘要翻译： FM接收机不知道信号的调制级别（频率偏差），并且必须对其进行估计，或者对其进行一些合理的时间平均，并因此设置输入滤波器的带宽。我们通过测量恢复的音频信号的自相关而不是其峰值来计算调制，然后应用峰值检测器。由于FM噪声可以被模拟为有些不相关，所以如果我们测量单样本延迟自相关估计值，我们可以期望获得信号功率的准确估计，同时抑制噪声功率。由于上述测量与功率测量类似，我们计算其平方根，增益调整它以获得更干净的峰值测量，然后使用泄漏积分器跟踪这些干净的峰值。这给出了抑制噪声影响的调制估计。

26. 发明申请

US20140057582A1 Robust FM Modulation Detector Using Signal Autocorrelation 有权
标题翻译：使用信号自相关的稳健FM调制检测器
公开(公告)号：US20140057582A1
公开(公告)日：2014-02-27
申请号：US13594506
申请日：2012-08-24
申请人： Sira Parasurama Rao , John Elliott Whitecar
发明人： Sira Parasurama Rao , John Elliott Whitecar
IPC分类号： H04L25/02
CPC分类号： H04L25/022 , H03D3/00 , H04B1/1646 , H04H40/72
摘要： An FM receiver is unaware of the modulation level (frequency deviation) of the signal and has to make an estimate of it, or some reasonable time-average of it, and accordingly set the input filter's bandwidth. We calculate modulation by measuring the autocorrelation of the recovered audio signal instead of its peaks, and then applying a peakhold detector. Since FM noise can be modeled to be somewhat uncorrelated, we can expect to get an accurate estimate of signal power while rejecting noise power substantially if we measure a one-sample delayed autocorrelation estimate. Since the above measurement is alike a power measurement, we compute its square root, gain adjust it to obtain a cleaner peak measurement, and then track these clean peaks using a leaky integrator. This gives an estimate of modulation that subdues the effect of the noise.
摘要翻译： FM接收机不知道信号的调制级别（频率偏差），并且必须对其进行估计，或者对其进行一些合理的时间平均，并因此设置输入滤波器的带宽。我们通过测量恢复的音频信号的自相关而不是其峰值来计算调制，然后应用峰值检测器。由于FM噪声可以被模拟为有些不相关，所以如果我们测量单样本延迟自相关估计值，我们可以期望获得信号功率的准确估计，同时抑制噪声功率。由于上述测量与功率测量类似，我们计算其平方根，增益调整它以获得更干净的峰值测量，然后使用泄漏积分器跟踪这些干净的峰值。这给出了抑制噪声影响的调制估计。

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