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1.发明授权公开(公告)号：US08238844B2
公开(公告)日：2012-08-07
申请号：US12473281
申请日：2009-05-28
申请人： Yifeng Zhang , Tracey Lee Chavers , Peiqi Xuan , Qifa Wu
发明人： Yifeng Zhang , Tracey Lee Chavers , Peiqi Xuan , Qifa Wu
CPC分类号： H04B1/034 , H03J1/0091
摘要： FM radio transmitter is being widely used in portable devices as a convenient way to output audio contents to ubiquitously available FM radio receivers in cars or homes. However, the signal from the FM radio transmitter may be interfering with the signal being broadcast by an FM radio station. A scan system is incorporated into the FM radio transmitter to quickly and reliably identify a vacant channel for the FM radio transmitter to use. The scan system measures on-channel and out-of-channel signal quality and selects a best channel for transmission based on the measured on-channel and out-of-channel signal quality. The scan system is also incorporated into an FM radio receiver to quickly and reliably tune to a valid channel. The scan system selects the valid channel based on the measured on-channel and out-of-channel signal quality.
摘要翻译： FM无线电发射机正在便携式设备中广泛使用，以便将音频内容输出到汽车或家庭中普遍可用的FM无线电接收机。 然而，来自FM无线电发射机的信号可能干扰由FM无线电台广播的信号。 扫描系统被并入FM无线电发射机，以快速可靠地识别用于FM无线电发射机使用的空闲信道。 扫描系统测量通道和通道外信号质量，并根据测量的通道和通道外信号质量选择最佳传输通道。 扫描系统也被并入到FM无线电接收机中以快速可靠地调谐到有效信道。 扫描系统基于所测量的在线信道和信道外信号质量来选择有效信道。
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2.发明申请公开(公告)号：US20120238228A1
公开(公告)日：2012-09-20
申请号：US13485907
申请日：2012-05-31
申请人： Yifeng Zhang , Tracey Lee Chavers , Peiqi Xuan , Qifa Wu
发明人： Yifeng Zhang , Tracey Lee Chavers , Peiqi Xuan , Qifa Wu
IPC分类号： H04B1/18
CPC分类号： H04B1/034 , H03J1/0091
摘要： FM radio transmitter is being widely used in portable devices as a convenient way to output audio contents to ubiquitously available FM radio receivers in cars or homes. However, the signal from the FM radio transmitter may be interfering with the signal being broadcast by an FM radio station. A scan system is incorporated into the FM radio transmitter to quickly and reliably identify a vacant channel for the FM radio transmitter to use. The scan system measures on-channel and out-of-channel signal quality and selects a best channel for transmission based on the measured on-channel and out-of-channel signal quality. The scan system is also incorporated into an FM radio receiver to quickly and reliably tune to a valid channel. The scan system selects the valid channel based on the measured on-channel and out-of-channel signal quality.
摘要翻译： FM无线电发射机正在便携式设备中广泛使用，以便将音频内容输出到汽车或家庭中普遍可用的FM无线电接收机。 然而，来自FM无线电发射机的信号可能干扰由FM无线电台广播的信号。 扫描系统被并入FM无线电发射机，以快速可靠地识别用于FM无线电发射机使用的空闲信道。 扫描系统测量通道和通道外信号质量，并根据测量的通道和通道外信号质量选择最佳传输通道。 扫描系统也被并入到FM无线电接收机中以快速可靠地调谐到有效信道。 扫描系统基于所测量的在线信道和信道外信号质量来选择有效信道。
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3.发明申请公开(公告)号：US20090311973A1
公开(公告)日：2009-12-17
申请号：US12473281
申请日：2009-05-28
申请人： Yifeng Zhang , Tracey Lee Chavers , Peiqi Xuan , Qifa Wu
发明人： Yifeng Zhang , Tracey Lee Chavers , Peiqi Xuan , Qifa Wu
IPC分类号： H04B1/40
CPC分类号： H04B1/034 , H03J1/0091
摘要： FM radio transmitter is being widely used in portable devices as a convenient way to output audio contents to ubiquitously available FM radio receivers in cars or homes. However, the signal from the FM radio transmitter may be interfering with the signal being broadcast by an FM radio station. A scan system is incorporated into the FM radio transmitter to quickly and reliably identify a vacant channel for the FM radio transmitter to use. The scan system measures on-channel and out-of-channel signal quality and selects a best channel for transmission based on the measured on-channel and out-of-channel signal quality. The scan system is also incorporated into an FM radio receiver to quickly and reliably tune to a valid channel. The scan system selects the valid channel based on the measured on-channel and out-of-channel signal quality.
摘要翻译： FM无线电发射机正在便携式设备中广泛使用，以便将音频内容输出到汽车或家庭中普遍可用的FM无线电接收机。 然而，来自FM无线电发射机的信号可能干扰由FM无线电台广播的信号。 扫描系统被并入FM无线电发射机，以快速可靠地识别用于FM无线电发射机使用的空闲信道。 扫描系统测量通道和通道外信号质量，并根据测量的通道和通道外信号质量选择最佳传输通道。 扫描系统也被并入到FM无线电接收机中以快速可靠地调谐到有效信道。 扫描系统基于所测量的在线信道和信道外信号质量来选择有效信道。
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4.发明授权公开(公告)号：US08712354B2
公开(公告)日：2014-04-29
申请号：US13485907
申请日：2012-05-31
申请人： Yifeng Zhang , Tracey Lee Chavers , Peiqi Xuan , Qifa Wu
发明人： Yifeng Zhang , Tracey Lee Chavers , Peiqi Xuan , Qifa Wu
CPC分类号： H04B1/034 , H03J1/0091
摘要： FM radio transmitter is being widely used in portable devices as a convenient way to output audio contents to ubiquitously available FM radio receivers in cars or homes. However, the signal from the FM radio transmitter may be interfering with the signal being broadcast by an FM radio station. A scan system is incorporated into the FM radio transmitter to quickly and reliably identify a vacant channel for the FM radio transmitter to use. The scan system measures on-channel and out-of-channel signal quality and selects a best channel for transmission based on the measured on-channel and out-of-channel signal quality. The scan system is also incorporated into an FM radio receiver to quickly and reliably tune to a valid channel. The scan system selects the valid channel based on the measured on-channel and out-of-channel signal quality.
摘要翻译： FM无线电发射机正在便携式设备中广泛使用，以便将音频内容输出到汽车或家庭中普遍可用的FM无线电接收机。 然而，来自FM无线电发射机的信号可能干扰由FM无线电台广播的信号。 扫描系统被并入FM无线电发射机，以快速可靠地识别用于FM无线电发射机使用的空闲信道。 扫描系统测量通道和通道外信号质量，并根据测量的通道和通道外信号质量选择最佳传输通道。 扫描系统也被并入到FM无线电接收机中以快速可靠地调谐到有效信道。 扫描系统基于所测量的在线信道和信道外信号质量来选择有效信道。
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5.发明授权Frequency modulation (FM) clear channel scanning system and method of using same 失效频率调制（FM）清除通道扫描系统及其使用方法公开(公告)号：US08478218B2
公开(公告)日：2013-07-02
申请号：US12137535
申请日：2008-06-11
申请人： Yifeng Zhang , Tracey Lee Chavers , Peiqi Xuan , Qifa Wu
发明人： Yifeng Zhang , Tracey Lee Chavers , Peiqi Xuan , Qifa Wu
CPC分类号： H03J1/0091
摘要： A scan system receives signals within a band from an antenna and divides the band into sub-bands and scans the channels of each sub-band to determine a candidate channel based on the lowest figure of merit (FOM) and includes an on-channel selection block responsive to a received digital signal and operative to select only the on-channel frequencies and to substantially disregard the out-of-channel frequencies from the digital signal. The scan system generates a FOM on-channel signal representing a measurement of the signal quality of the on-channel signal and includes an out-of-channel selection block responsive to the digital signal and operative to select only the out-of-channel frequencies and to substantially disregard the on-channel frequencies from the digital signal and operative to generate a FOM out-of-channel signal representing a measurement of the signal quality of the out-of-channel signal.
摘要翻译： 扫描系统从天线接收频带内的信号，并将频带划分为子带，并扫描每个子带的信道，以便根据最低品质因数（FOM）确定候选信道，并包括一个通道内选择 响应于接收到的数字信号并且仅操作以仅选择在频道上的频率并且基本上忽略来自数字信号的信道外频率。 扫描系统产生表示通道信号的信号质量的测量的FOM通道信号，并且包括响应于数字信号的通道外选择块，并且仅操作以仅选择通道外频率 并且基本上忽略来自数字信号的通道频率，并且可操作地产生表示信道外信号的信号质量测量的FOM信道外信号。
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公开(公告)号：US20120026407A1
公开(公告)日：2012-02-02
申请号：US13116532
申请日：2011-05-26
申请人： Yifeng Zhang , Rong Liu , Peiqi Xuan , Xiaodong Jin
发明人： Yifeng Zhang , Rong Liu , Peiqi Xuan , Xiaodong Jin
CPC分类号： H04B1/30 , H04B1/0032 , H04B1/406 , H04N5/46 , H04N21/42638
摘要： A configurable multi-standard receiver. A receiver comprises a mixer, a processing module and an analog to digital converter is disclosed to receive multi-standard radio signals. The processing module includes a first selection switch and first parameter control, where the first selection switch configures the processing module as a complex filter or a real-valued filter and the first parameter control configures the characteristics of the filter. Furthermore, the analog to digital converted is preferably implemented using sigma delta modulation to achieve a desired noise shaping. The sigma delta modulation comprises a second selection switch and second parameter control. The second selection switch configures the sigma delta modulation to function as a unit having a complex loop filter or a unit having real-valued loop filters. The second parameter control configures the characteristics of the loop filter. The settings for the first and second selection switches and the first and second control parameters may be stored in a control register.
摘要翻译： 可配置的多标准接收器。 接收机包括混频器，处理模块和模数转换器，用于接收多标准无线电信号。 处理模块包括第一选择开关和第一参数控制，其中第一选择开关将处理模块配置为复数滤波器或实值滤波器，并且第一参数控制器配置滤波器的特性。 此外，优选地，使用Σ-Δ调制来实现模数转换，以实现期望的噪声整形。 Σ-Δ调制包括第二选择开关和第二参数控制。 第二选择开关将Σ-Δ调制配置为具有复环路滤波器或具有实值环路滤波器的单元的单元。 第二个参数控制配置环路滤波器的特性。 第一和第二选择开关以及第一和第二控制参数的设置可以存储在控制寄存器中。
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7.发明授权公开(公告)号：US08422409B2
公开(公告)日：2013-04-16
申请号：US12895143
申请日：2010-09-30
申请人： Hangwei Guo , Yifeng Zhang , Peiqi Xuan
发明人： Hangwei Guo , Yifeng Zhang , Peiqi Xuan
摘要： A device and method of duplex audio communication over a broadcast channel are disclosed. Low-power transmission over a broadcast channel is permissible for personal use as long as the transmitted power level is below a level allowed by respective regulatory. For example, low-power FM transmitter can be used to provide a wireless audio link between two audio devices. One such application scenario is a wireless speakerphone used as an audio extension from a cellphone for group conference purposes. Such applications face issues of potential interference from other users of the same channel and the need of manually selecting and tuning a pair of channels. The device and method disclosed in the present invention use the clear channel technique to automatically select an un-occupied channel for the transmit side and utilizes an identification embedded in a sub-channel to allow the receiver to automatically tune to the channel used by the transmitter. The clear channels may be determined by respective transceivers or determined by a master transceiver.
摘要翻译： 公开了一种通过广播信道进行双工音频通信的设备和方法。 只要发射功率水平低于相关监管机构允许的水平，就可以在广播频道上进行低功率传输。 例如，低功率FM发射机可用于在两个音频设备之间提供无线音频链路。 一种这样的应用场景是用作用于组会议目的的手机的音频扩展的无线扬声器。 这样的应用程序面临来自相同信道的其他用户的潜在干扰的问题以及手动选择和调谐一对信道的需要。 在本发明中公开的设备和方法使用清晰的信道技术来自动选择用于发射侧的未占用信道，并利用嵌入在子信道中的标识来允许接收机自动调谐到由发射机使用的信道 。 清除信道可以由相应的收发器确定或由主收发器确定。
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公开(公告)号：US08595538B2
公开(公告)日：2013-11-26
申请号：US12041543
申请日：2008-03-03
申请人： Yifeng Zhang , Peiqi Xuan , Kanyu Cao , Xiaodong Jin
发明人： Yifeng Zhang , Peiqi Xuan , Kanyu Cao , Xiaodong Jin
CPC分类号： H03L7/099 , H03L2207/12
摘要： In an embodiment of the present invention, a clock generator circuit is disclosed to include a phase locked loop (PLL) that is responsive to a reference frequency and operative to generate a single clock frequency and a clock signal quadrature output frequency and a clock signal in-phase output with the frequency of the clock signal quadrature output frequency and the clock signal in-phase output frequency being a fraction of the frequency of the single clock frequency. The PLL includes a single voltage controlled oscillator (VCO) that generates the single clock frequency. A plurality of dividers is included in the clock generator circuit and is responsive to the clock signal quadrature output frequency and the clock signal in-phase output frequency and generates multiple clock frequencies, each clock frequency being a unique frequency, each of the plurality of dividers generating an output, the final output of the plurality of dividers being synchronized to the reference frequency.
摘要翻译： 在本发明的实施例中，公开了一种时钟发生器电路，其包括响应于参考频率并且可操作以产生单个时钟频率和时钟信号正交输出频率的锁相环（PLL）和时钟信号 相位输出与时钟信号的频率正交输出频率和时钟信号同相输出频率是单个时钟频率频率的一部分。 PLL包括产生单个时钟频率的单个压控振荡器（VCO）。 多个分频器被包括在时钟发生器电路中，并且响应于时钟信号正交输出频率和时钟信号同相输出频率，并且产生多个时钟频率，每个时钟频率是唯一的频率，每个分频器 产生输出，多个分频器的最终输出与参考频率同步。
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公开(公告)号：US20110159835A1
公开(公告)日：2011-06-30
申请号：US12649345
申请日：2009-12-30
申请人： Peiqi Xuan , Yifeng Zhang
发明人： Peiqi Xuan , Yifeng Zhang
CPC分类号： H03L7/22 , H03L7/0805 , H03L7/0991 , H03L7/10 , H03L7/183
摘要： Systems and methods of clock generation for radio frequency receiver. In radio frequency receiver, the system requires accurate local oscillating (LO) signal and system clocks for proper operation and to ensure high quality performance. In order to achieve accurate LO frequency and system clock, a crystal or and accurate reference clock is provide to the clock generation circuit. How a low-cost receiver, it is desirable to eliminate the requirement for a crystal or an accurate reference clock. The present invention discloses systems and methods to utilize a pilot signal embedded in the transmitted signal. The pilot signal usually has very accurate frequency which is particular true for broadcast system such as FM broadcast. In various embodiments of the present invention, the systems and methods measure the relation between the frequency of the pilot signal and the current clock generated. The measured result is compared with a know relation corresponding to the frequency of the pilot signal and the target clock signal and the result is used to adjust the clock generation circuit.
摘要翻译： 无线电频率接收机的时钟发生系统和方法。 在射频接收机中，系统需要精确的本地振荡（LO）信号和系统时钟，以便正常运行，并确保高质量的性能。 为了实现准确的LO频率和系统时钟，提供晶体或精确的参考时钟给时钟发生电路。 低成本接收机如何消除晶体或精确参考时钟的要求。 本发明公开了利用嵌入发射信号中的导频信号的系统和方法。 导频信号通常具有非常精确的频率，这对于诸如FM广播的广播系统尤其如此。 在本发明的各种实施例中，系统和方法测量导频信号的频率与所产生的当前时钟之间的关系。 将测量结果与对应于导频信号和目标时钟信号的频率的已知关系进行比较，并将结果用于调整时钟产生电路。
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公开(公告)号：US08280330B2
公开(公告)日：2012-10-02
申请号：US12649345
申请日：2009-12-30
申请人： Peiqi Xuan , Yifeng Zhang
发明人： Peiqi Xuan , Yifeng Zhang
CPC分类号： H03L7/22 , H03L7/0805 , H03L7/0991 , H03L7/10 , H03L7/183
摘要： Systems and methods of clock generation for radio frequency receiver. In radio frequency receiver, the system requires accurate local oscillating (LO) signal and system clocks for proper operation and to ensure high quality performance. In order to achieve accurate LO frequency and system clock, a crystal or and accurate reference clock is provide to the clock generation circuit. How a low-cost receiver, it is desirable to eliminate the requirement for a crystal or an accurate reference clock. The present invention discloses systems and methods to utilize a pilot signal embedded in the transmitted signal. The pilot signal usually has very accurate frequency which is particular true for broadcast system such as FM broadcast. In various embodiments of the present invention, the systems and methods measure the relation between the frequency of the pilot signal and the current clock generated. The measured result is compared with a know relation corresponding to the frequency of the pilot signal and the target clock signal and the result is used to adjust the clock generation circuit.
摘要翻译： 无线电频率接收机的时钟发生系统和方法。 在射频接收机中，系统需要精确的本地振荡（LO）信号和系统时钟，以便正常运行，并确保高质量的性能。 为了实现准确的LO频率和系统时钟，提供晶体或精确的参考时钟给时钟发生电路。 低成本接收机如何消除晶体或精确参考时钟的要求。 本发明公开了利用嵌入发射信号中的导频信号的系统和方法。 导频信号通常具有非常精确的频率，这对于诸如FM广播的广播系统尤其如此。 在本发明的各种实施例中，系统和方法测量导频信号的频率与所产生的当前时钟之间的关系。 将测量结果与对应于导频信号和目标时钟信号的频率的已知关系进行比较，并将结果用于调整时钟产生电路。
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