公开(公告)号：US20110261913A1

公开(公告)日：2011-10-27

申请号：US13141861

申请日：2009-12-17

申请人： Robert Fifield ,  Robert Fifield

发明人： Robert Fifield ,  Robert Fifield

IPC分类号： H04B1/10

CPC分类号： H04L25/03159

摘要： An arrangement (30) and a method for digitally filtering a time-discrete digital signal, wherein the signal is transformed to the frequency domain using discrete Fourier transformation (31), the signal is filtered in the frequency domain (33), wherein a filter response can be adapted in real time as required to respond to changes in the interference environment, and the filtered signal is transformed back to the time domain using inverse discrete Fourier transformation (32) to create an output signal, and wherein bin frequencies of said signal in the frequency domain are translated by a real amount and the sampling rate of the output signal is changed by a real factor.

摘要翻译： 一种用于数字滤波时间离散数字信号的装置（30）和方法，其中使用离散傅里叶变换将信号变换到频域（31），该信号在频域（33）中被滤波，其中滤波器 响应可以根据需要适应于响应于干扰环境的变化，并且使用逆离散傅里叶变换（32）将经滤波的信号变换回时域以产生输出信号，并且其中所述信号的二进制频率 在频域中以实际数量进行转换，输出信号的采样率由实际值改变。

公开(公告)号：US20120150934A1

公开(公告)日：2012-06-14

申请号：US13334484

申请日：2011-12-22

申请人： Robert Fifield

发明人： Robert Fifield

IPC分类号： G06F17/10

CPC分类号： H04B1/123 ,  H03H21/0021 ,  H03H21/0027 ,  H03H21/0043 ,  H04B1/0003 ,  H04B1/0032 ,  H04B1/0035 ,  H04B1/0039 ,  H04B1/30 ,  H04B1/7136 ,  H04B2001/71367

摘要： A receiver comprises an adaptive filter having an input for a digitized input signal, means for storing a pre-designed filter characteristic, means for analyzing a digital. representation of the input signal to determine a desired position of the filter characteristic to match the system requirements, and means for adapting the stored pre-designed filter characteristic in the frequency domain and/or the time domain to match the system requirements and for transforming the adapted filter characteristic to the time domain to update coefficients for the adaptive filter and for loading updated coefficients into adaptive filter. The updating of the coefficients may be done periodically. The adaptation may be one or more of adjusting bandwidth, frequency shift and, in the case of a bandpass characteristic, superimposing characteristics.

摘要翻译： 接收机包括具有用于数字化输入信号的输入的自适应滤波器，用于存储预设滤波特性的装置，用于分析数字的装置。 输入信号的表示以确定滤波器特性以满足系统要求的期望位置，以及用于在频域和/或时域中调整存储的预先设计的滤波器特性以匹配系统要求并用于变换 适应滤波器特性到时域以更新自适应滤波器的系数并将更新的系数加载到自适应滤波器中。 系数的更新可以周期性地进行。 适应可以是调整带宽，频移以及在带通特性的情况下的叠加特性中的一个或多个。

公开(公告)号：US06504834B1

公开(公告)日：2003-01-07

申请号：US09102838

申请日：1998-06-23

申请人： Robert Fifield

发明人： Robert Fifield

IPC分类号： H04Q700

CPC分类号： H04W72/1278 ,  H04W40/24 ,  H04W72/1263

摘要： A method of operating a wireless network comprising a plurality of wireless terminals and optionally a base station uses a transmission frame (300) including an association section (310) for use by wireless terminals wishing to join the network. A variable number of association sections (310) is scheduled in response to operating characteristics such as the load on the network or the presence of a high security application on the network.

摘要翻译： 一种操作包括多个无线终端和可选地基站的无线网络的方法使用包括关联部分（310）的传输帧（300），以供希望加入网络的无线终端使用。 响应于诸如网络上的负载或网络上的高安全性应用的存在的操作特性来调度可变数目的关联部分（310）。

公开(公告)号：US08634507B2

公开(公告)日：2014-01-21

申请号：US13334484

申请日：2011-12-22

申请人： Robert Fifield

发明人： Robert Fifield

IPC分类号： H04B1/10

CPC分类号： H04B1/123 ,  H03H21/0021 ,  H03H21/0027 ,  H03H21/0043 ,  H04B1/0003 ,  H04B1/0032 ,  H04B1/0035 ,  H04B1/0039 ,  H04B1/30 ,  H04B1/7136 ,  H04B2001/71367

摘要： A receiver comprises an adaptive filter having an input for a digitized input signal, means for storing a pre-designed filter characteristic, means for analyzing a digital. representation of the input signal to determine a desired position of the filter characteristic to match the system requirements, and means for adapting the stored pre-designed filter characteristic in the frequency domain and/or the time domain to match the system requirements and for transforming the adapted filter characteristic to the time domain to update coefficients for the adaptive filter and for loading updated coefficients into adaptive filter. The updating of the coefficients may be done periodically. The adaptation may be one or more of adjusting bandwidth, frequency shift and, in the case of a bandpass characteristic, superimposing characteristics.

摘要翻译： 接收机包括具有用于数字化输入信号的输入的自适应滤波器，用于存储预设滤波特性的装置，用于分析数字的装置。 输入信号的表示以确定滤波器特性以满足系统要求的期望位置，以及用于在频域和/或时域中调整存储的预先设计的滤波器特性以匹配系统要求并用于变换 适应滤波器特性到时域以更新自适应滤波器的系数并将更新的系数加载到自适应滤波器中。 系数的更新可以周期性地进行。 适应可以是调整带宽，频移以及在带通特性的情况下的叠加特性中的一个或多个。

公开(公告)号：US20090150468A1

公开(公告)日：2009-06-11

申请号：US11996300

申请日：2006-07-26

申请人： Robert Fifield

发明人： Robert Fifield

IPC分类号： G06F17/10

CPC分类号： H03H17/0227 ,  H03H17/0225

摘要： A FIR filter (20) has a delay line comprising four delay elements (21a, 21b, 21c, 21d) for delaying a signal received at a filter input (22) and four multipliers (24a, 24b, 24c, 24d) for multiplying the delayed signals by respective partial filter coefficients a, b, c, d. The delay elements (21a, 21b, 21c, 21d) and multipliers (24a, 24b, 24c, 24d) are connected alternately in series. Four taps (23a, 23b, 23c, 23d) extract the signal from the delay line immediately after each of the delay elements (21a, 21b, 21c, 21d) and output the delayed, multiplied signals to an adder (25) for adding the delayed, multiplied signals to generate a filter output (26). The partial filter coefficients a, b, c, d effectively combine to implement filter coefficients A, B, C, D for the taps (23a, 23b, 23c, 23d), e.g. with A=a, B=a*b, C=a*b*c and D=a*b*c*d. Use of such partial filter coefficients a, b, c, d can significantly reduce the number of operations required for multiplication in the FIR filter (20) in comparison to the prior art.

摘要翻译： FIR滤波器（20）具有延迟线，该延迟线包括用于延迟在滤波器输入端（22）接收的信号的四个延迟元件（21a，21b，21c，21d）和四个乘法器（24a，24b，24c，24d） 通过相应的部分滤波器系数a，b，c，d的延迟信号。 延迟元件（21a，21b，21c，21d）和乘法器（24a，24b，24c，24d）交替地串联连接。 四个抽头（23a，23b，23c，23d）在每个延迟元件（21a，21b，21c，21d）之后立即提取来自延迟线的信号，并将延迟相乘的信号输出到加法器（25） 延迟的相乘信号以产生滤波器输出（26）。 部分滤波器系数a，b，c，d有效地组合以实现抽头（23a，23b，23c，23d）的滤波器系数A，B，C，D。 A = a，B = a * b，C = a * b * c和D = a * b * c * d。 与现有技术相比，这种部分滤波器系数a，b，c，d的使用可以显着地减少在FIR滤波器（20）中乘法所需的操作次数。

公开(公告)号：US06744752B1

公开(公告)日：2004-06-01

申请号：US09666400

申请日：2000-09-20

申请人： Robert Fifield

发明人： Robert Fifield

IPC分类号： H04Q100

CPC分类号： H04W84/20 ,  G08C17/02 ,  G08C2201/40 ,  H04W52/0258 ,  H04W76/10 ,  H04W84/12 ,  Y02D70/00

摘要： A radio local area network(LAN) comprises a plurality of plug and play operating devices(OD1 to OD4), such as TV, STB, VCR and PC, one of which devices functions as a central controller(CC) which sets up time division digital data links between the operating devices in response to activating a suitable man/machine interface, for example an infra-red TV remote controller(RC). Those of the operating devices capable of operating as a central controller have stores(32) for storing power-on data so that in the event of the current central controller becoming de-energised an arbitration process is invoked whereby the operating device having the best power-on history becomes the new central controller. In a refinement, the arbitration process may be invoked when an operating device joins the radio LAN but in order to deter too many changes in central controllers the history of the current central controller is weighted.

摘要翻译： 无线局域网（LAN）包括诸如TV，STB，VCR和PC的多个即插即用操作设备（OD1至OD4），其中一个设备用作建立时分的中央控制器（CC） 响应激活合适的人机界面，例如红外线TV遥控器（RC），操作装置之间的数字数据链接。 能够作为中央控制器操作的操作装置的那些具有用于存储上电数据的存储器（32），使得在当前中央控制器变为断电的情况下，调用仲裁处理，从而使具有最佳功率的操作装置 历史成为新的中央控制器。在细化中，当操作设备加入无线电局域网时，可以调用仲裁过程，但是为了阻止中央控制器的太多变化，当前中央控制器的历史被加权。

公开(公告)号：US20100310018A1

公开(公告)日：2010-12-09

申请号：US12864084

申请日：2009-01-28

申请人： Richard John Caldwell ,  Robert Fifield

发明人： Richard John Caldwell ,  Robert Fifield

IPC分类号： H04L27/06

CPC分类号： H04B1/1027 ,  H04L27/0008 ,  H04L27/0012 ,  H04W52/0245 ,  Y02D70/1222 ,  Y02D70/1242 ,  Y02D70/142 ,  Y02D70/164 ,  Y02D70/40

摘要： A device processes signals from a plurality of signal channels that are received in parallel. A channel processing circuit (12a,b, 14a,b), applies a series of filtering operations selectively to the signal from a first one of the signal channels. A filter management circuit (18) detects a reception condition from reception of a signal in a second one of the signal channels. The filter management circuit (18) controls application of at least a part of said filtering operations to the signal from the first one the signal channels by the channel processing circuit (12a,b, 14a,b), dependent on the detected reception condition. Selected filter operations may be enabled or disabled. Thus, power consumption may be reduced. In an embodiment, the detected reception condition is determined as a by-product of functional reception of another channel. Thus power consumption for the detection of the reception condition is also reduced. From reception of specific types of channels, for example, it may be detected whether the device is indoors or outdoors and filtering of other channels may be adapted accordingly.

摘要翻译： 设备处理来自并行接收的多个信号信道的信号。 信道处理电路（12a，b，14a，b）对来自第一信号信道的信号选择性地应用一系列滤波操作。 滤波器管理电路（18）从第二信号信道中的信号的接收中检测接收状态。 滤波器管理电路（18）根据检测到的接收条件，控制信道处理电路（12a，b，14a，b）对信号通道的信号的至少一部分的滤波操作的应用。 可以启用或禁用所选的过滤器操作。 因此，可以降低功耗。 在一个实施例中，检测到的接收条件被确定为另一信道的功能接收的副产品。 因此，用于检测接收条件的功耗也降低。 例如，从特定类型的信道的接收中，可以检测设备是室内还是室外，并且可以相应地调整其他信道的过滤。

公开(公告)号：US20090305643A1

公开(公告)日：2009-12-10

申请号：US12483667

申请日：2009-06-12

申请人： Anthony Sayers ,  Robert Fifield

发明人： Anthony Sayers ,  Robert Fifield

IPC分类号： H04B1/00

CPC分类号： H04B1/1027 ,  H04B1/26

摘要： A radio receiver (600) in which a local oscillator frequency is selected dependent on the level of a received signal. The received signal may be a wanted signal or an interferer, or the level of both may be measured.

摘要翻译： 根据接收信号的电平选择本地振荡器频率的无线电接收机（600）。 接收的信号可以是有用信号或干扰源，或者可以测量两者的电平。

公开(公告)号：US06781951B1

公开(公告)日：2004-08-24

申请号：US09425657

申请日：1999-10-22

申请人： Robert Fifield

发明人： Robert Fifield

IPC分类号： H04J1100

CPC分类号： H04L27/2602 ,  H04L1/18 ,  H04L27/2623

摘要： A method of operating a radio communication system uses orthogonal signals for transmission of packets of data between two or more stations. In the transmitter data is encoded onto a plurality of orthogonal carriers by a differential phase modulation technique, for example DQPSK. The carriers are combined into a single signal by an inverse discrete Fourier transform and clipped at a predetermined amplitude before being transmitted to reduce the crest factor of the transmitted signal. The phase of one or more of the carriers is randomized before each data packet, hence a different crest factor will result for retransmissions of the same packet. This ensures that if a packet is difficult to transmit, because of reduced signal to noise ratio caused by clipping, it will retransmit successfully.

摘要翻译： 操作无线电通信系统的方法使用正交信号来在两个或更多个站之间传输数据分组。 在发射机数据通过差分相位调制技术（例如DQPSK）被编码到多个正交载波上。 通过逆离散傅立叶变换将载波组合成单个信号，并在传输之前以预定的幅度被削波，以减小发射信号的波峰因数。 一个或多个载波的相位在每个数据分组之前被随机化，因此将导致相同分组的重传的不同波峰因数。 这确保了如果分组难以传输，由于由削波引起的信噪比降低，它将成功重发。

公开(公告)号：US08792600B2

公开(公告)日：2014-07-29

申请号：US13141861

申请日：2009-12-17

申请人： Robert Fifield ,  Brian John Minnis

发明人： Robert Fifield ,  Brian John Minnis

IPC分类号： H04B1/10

CPC分类号： H04L25/03159

摘要： An arrangement (30) and a method for digitally filtering a time-discrete digital signal, wherein the signal is transformed to the frequency domain using discrete Fourier transformation (31), the signal is filtered in the frequency domain (33), wherein a filter response can be adapted in real time as required to respond to changes in the interference environment, and the filtered signal is transformed back to the time domain using inverse discrete Fourier transformation (32) to create an output signal, and wherein bin frequencies of said signal in the frequency domain are translated by a real amount and the sampling rate of the output signal is changed by a real factor.

摘要翻译： 一种用于数字滤波时间离散数字信号的装置（30）和方法，其中使用离散傅里叶变换将信号变换到频域（31），该信号在频域（33）中被滤波，其中滤波器 响应可以根据需要适应于响应于干扰环境的变化，并且使用逆离散傅里叶变换（32）将经滤波的信号变换回时域以产生输出信号，并且其中所述信号的二进制频率 在频域中以实际数量进行转换，输出信号的采样率由实际值改变。