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1. 发明授权

US07613211B1 Digital clock smoothing apparatus and method 失效
标题翻译：数字时钟平滑装置及方法
公开(公告)号：US07613211B1
公开(公告)日：2009-11-03
申请号：US11357685
申请日：2006-02-18
申请人： Richard John Fagerlund , James P. Flynn , Mark Fong , David Bruce Isaksen
发明人： Richard John Fagerlund , James P. Flynn , Mark Fong , David Bruce Isaksen
IPC分类号： H04J3/06 , H04L7/00
CPC分类号： G06F5/06 , G06F2205/061
摘要： A method for digital clock smoothing comprising: (A) inputting an asynchronous data stream having an asynchronous symbol rate into a two-port memory block; (B) accumulating a plurality of symbols of the asynchronous data stream in the two-port memory block for a predetermined time period; (C) computing an average symbol rate for the input asynchronous data stream; (D) generating a clock error signal equal to the difference between the average symbol rate of the input asynchronous data stream and a nominal output synchronous clock; (E) obtaining a smoothed symbol rate clock by using the error clock signal; and (F) generating an output smoothed data stream having the smoothed symbol rate clock.
摘要翻译：一种用于数字时钟平滑的方法，包括：（A）将具有异步符号速率的异步数据流输入到双端口存储器块中; （B）在所述双端口存储器块中累积所述异步数据流的多个符号预定时间段; （C）计算所述输入异步数据流的平均符号率; （D）产生等于所述输入异步数据流的平均符号速率与标称输出同步时钟之间的差的时钟误差信号; （E）通过使用所述误差时钟信号获得平滑的符号速率时钟; 和（F）产生具有平滑符号速率时钟的输出平滑数据流。

2. 发明授权

US07477708B1 Modes of operations in QAM modems 失效
标题翻译： QAM调制解调器的操作模式
公开(公告)号：US07477708B1
公开(公告)日：2009-01-13
申请号：US11404521
申请日：2006-04-15
申请人： David Bruce Isaksen , Mark Fong
发明人： David Bruce Isaksen , Mark Fong
IPC分类号： H03D3/22 , H04L27/22
CPC分类号： H04L25/0305 , H04L7/033 , H04L27/3854 , H04L2027/0036
摘要： The method of selecting an optimum mode of operation of the QAM modem comprising (A) using a host interface to select a pair of states, the first state being an initial state; the second state being an intermediate state; and (B) causing a state machine to progress from the initial state to a final state via the intermediate state to optimize the performance of the QAM modem.
摘要翻译：选择QAM调制解调器的最佳操作模式的方法，包括：（A）使用主机接口选择一对状态，所述第一状态为初始状态; 第二状态是中间状态; 和（B）使状态机通过中间状态从初始状态进入最终状态，以优化QAM调制解调器的性能。

3. 发明授权

US07079605B1 Frequency estimation based on constellation error in QAM modems 失效
标题翻译：基于QAM调制解调器中星座误差的频率估计
公开(公告)号：US07079605B1
公开(公告)日：2006-07-18
申请号：US10134224
申请日：2002-04-25
申请人： David Bruce Isaksen , Byron Esten Danzer
发明人： David Bruce Isaksen , Byron Esten Danzer
IPC分类号： H04L27/06 , H03D3/00
CPC分类号： H04L27/3827 , H04L2027/0057 , H04L2027/0063
摘要： A method for frequency estimation in a QAM modem comprising the following steps: (1) receiving inphase and quadrature components of a QAM symbol from a carrier recovery block; (2) mapping received QAM symbol to a nearest QAM plant point using a slicer; (3) determining an instant error power of the received QAM point; (4) averaging the instant error power over a plurality of incoming QAM symbols in time domain; (5) excluding a DC component from the averaged error power; (6) translating the averaged error power without DC component from time domain into a frequency domain in order to determine the frequency spectrum of the averaged error power; (7) selecting the frequency spectrum component of the averaged error power with the maximum amplitude by using a peak detection; and (8) determining the frequency offset as the maximum frequency spectrum component of the averaged error power.
摘要翻译：一种用于QAM调制解调器中的频率估计的方法，包括以下步骤：（1）从载波恢复块接收QAM符号的同相和正交分量; （2）使用限幅器将接收的QAM符号映射到最接近的QAM植物点; （3）确定所接收的QAM点的瞬时误差功率; （4）在时域上对多个输入QAM符号进行平均瞬时误差功率; （5）从平均误差功率中排除DC分量; （6）将没有DC分量的平均误差功率从时域转换成频域，以便确定平均误差功率的频谱; （7）通过使用峰值检测来选择具有最大幅度的平均误差功率的频谱分量; 和（8）将频率偏移确定为平均误差功率的最大频谱分量。

4. 发明授权

US07995622B1 Digital clock smoothing 失效
标题翻译：数字时钟平滑
公开(公告)号：US07995622B1
公开(公告)日：2011-08-09
申请号：US12587266
申请日：2009-10-05
申请人： Richard John Fagerlund , James P. Flynn , Mark Fong , David Bruce Isaksen
发明人： Richard John Fagerlund , James P. Flynn , Mark Fong , David Bruce Isaksen
IPC分类号： H04J3/06 , H04L7/00
CPC分类号： G06F5/06 , G06F2205/061
摘要： A method for digital clock smoothing is provided. The method comprises: (A) inputting an asynchronous data stream having an asynchronous symbol rate into a FIFO two-port memory block; (B) obtaining FIFO depth B by subtracting modulo B for each stored symbol a symbol output address from a symbol input address; (C) inputting FIFO depth B into a programmable look-up table (LUT); (D) obtaining a phase detector error signal; (E) scaling the phase detector error signal to obtain a scaled error factor; (F) adding the scaled error factor to a nominal phase step to obtain a phase update; (G) obtaining a smoothed symbol rate; and (H) reading out each output symbol from FIFO under control of an output FIFO address control register at the smoothed symbol rate.
摘要翻译：提供了一种用于数字时钟平滑的方法。该方法包括：（A）将具有异步符号速率的异步数据流输入到FIFO双端口存储器块中; （B）通过从符号输入地址减去每个存储符号的符号输出地址的模B来获得FIFO深度B; （C）将FIFO深度B输入到可编程查询表（LUT）中; （D）获得相位检测器误差信号; （E）缩放相位检测器误差信号以获得缩放误差因子; （F）将缩放的误差因子加到标称相位步长以获得相位更新; （G）获得平滑符号率; 和（H）以平滑符号速率在输出FIFO地址控制寄存器的控制下从FIFO读出每个输出符号。

5. 发明授权

US06904098B1 Linear phase robust carrier recovery for QAM modems 失效
标题翻译： QAM调制解调器的线性相位鲁棒载波恢复
公开(公告)号：US06904098B1
公开(公告)日：2005-06-07
申请号：US09981085
申请日：2001-10-16
申请人： David Bruce Isaksen , Byron Esten Danzer
发明人： David Bruce Isaksen , Byron Esten Danzer
IPC分类号： H03J7/02 , H04L5/12 , H04L25/03 , H04L25/06 , H04L27/00 , H04L27/38
CPC分类号： H04L25/03019 , H03D2200/0047 , H03J7/02 , H04L7/0029 , H04L25/063 , H04L27/0014 , H04L27/3872 , H04L2027/003 , H04L2027/0036 , H04L2027/0057 , H04L2027/0067 , H04L2027/0069 , H04L2027/0079 , H04L2027/0085
摘要： In a QAM demodulator including an adaptive equalizer, a method of carrier tracking comprising the following steps is disclosed: (A) sampling a QAM signal received from a transmission channel; (B) recovering a symbol clock function from the sampled QAM signal; (C) applying the sampled QAM signal to the adaptive equalizer in order to obtain a QAM equalized signal in a Blind Equalization (BE) mode; (D) using a slicer to locate a nearest plant point for the QAM Blind equalized signal for each recovered symbol clock; (E) using a complex conjugate multiplier to obtain an instantaneous inphase component and an instantaneous quadrature component of a phase angle error signal; (F) using a linear phase detector to obtain an instantaneous phase angle error for each symbol clock; (G) averaging the instantaneous phase angle error signal by using a carrier loop filter; (H) using a complex multiplier to insert an inverse of the averaged phase angle error signal into the QAM Blind equalized signal to compensate for the carrier phase angle error; and (I) repeating the steps (D-H) to close a carrier frequency loop.
摘要翻译：在包括自适应均衡器的QAM解调器中，公开了包括以下步骤的载波跟踪方法：（A）对从传输信道接收的QAM信号进行采样; （B）从采样的QAM信号中恢复符号时钟功能; （C）将采样的QAM信号施加到自适应均衡器，以便以盲均衡（BE）模式获得QAM均衡信号; （D）使用切片器为每个恢复的符号时钟定位用于QAM盲均衡信号的最近植物点; （E）使用复共轭乘法器来获得相位角误差信号的瞬时同相分量和瞬时正交分量; （F）使用线性相位检测器来获得每个符号时钟的瞬时相位角误差; （G）使用载波环路滤波器平均瞬时相位角误差信号; （H），使用复数乘法器将平均相位角误差信号的反相插入到QAM盲均衡信号中，以补偿载波相位角误差; 和（I）重复步骤（D-H）以闭合载波频率回路。

6. 发明授权

US07453986B1 Digital dental image apparatus 失效
标题翻译：数字牙科图像设备
公开(公告)号：US07453986B1
公开(公告)日：2008-11-18
申请号：US11142179
申请日：2005-05-31
申请人： David Bruce Isaksen
发明人： David Bruce Isaksen
IPC分类号： H05G1/64
CPC分类号： A61B6/145 , H04N5/32 , H04N5/357 , H04N5/3575 , H04N5/3765
摘要： A digital dental image apparatus comprising: (A) an intra-oral image sensor configured to output a raw analog video signal; (B) a processing raw analog video signal (PRAVS) means for processing the raw analog video signal for optimum detection; (B) a digitizing, over sampling, and averaging (DOSA) means for digitizing, over sampling, and averaging the optimized analog video signal; and (C) a programmable control and signal processing (PCSP) means configured to generate a control signal to control an over sampling rate of the (DOSA) means. The PCSP means is configured to process the DOSA video signal, and configured to output the processed DOSA video signal to an output network interface.
摘要翻译：一种数字牙科图像设备，包括：（A）口内图像传感器，被配置为输出原始模拟视频信号; （B）处理原始模拟视频信号（PRAVS）装置，用于处理原始模拟视频信号以进行最佳检测; （B）数字化，过采样和平均（DOSA）装置，用于数字化，过采样和平均优化的模拟视频信号; 和（C）可编程控制和信号处理（PCSP）装置，被配置为产生控制信号以控制（DOSA）装置的过采样率。 PCSP装置被配置为处理DOSA视频信号，并且被配置为将经处理的DOSA视频信号输出到输出网络接口。

7. 发明授权

US07170956B1 Frequency agile tuner and variable rate decimator for digital demodulator 失效
标题翻译：频率敏捷调谐器和数字解调器的可变速率抽取器
公开(公告)号：US07170956B1
公开(公告)日：2007-01-30
申请号：US10345863
申请日：2003-01-15
申请人： Mark Fong , David Bruce Isaksen
发明人： Mark Fong , David Bruce Isaksen
IPC分类号： H04L27/06 , H04B27/06 , H04B1/18
CPC分类号： H03H17/0664 , H03H17/0671 , H03H2220/04 , H04L7/0029 , H04L7/0054 , H04L25/03828 , H04L27/2273 , H04L27/3827 , H04L2027/003 , H04L2027/0057 , H04L2027/0069
摘要： An apparatus for demodulating a digital input signal having a pre-assigned symbol rate by using a single sample clock signal is disclosed. The pre-assigned symbol rate is selected from the group consisting of a plurality of symbol rates. The apparatus comprises: a Cascaded Integrated Comb (CIC) Decimator filter configured to perform a filtering-decimation operation to isolate the down converted digital signal having the pre-assigned symbol rate; a Shaper configured to restore an original spectrum of the I and Q components of the CIC output signal; and a CIC tuner loop filter configured to insert the estimated by the Coarse Frequency estimation block frequency offset into a carrier loop in order to complete a carrier recovery of the pre-assigned input digital signal.
摘要翻译：公开了一种用于通过使用单个采样时钟信号来解调具有预分配码元速率的数字输入信号的装置。从由多个符号率组成的组中选择预分配符号率。该装置包括：级联集成梳状（CIC）抽取器滤波器，被配置为执行滤波抽取操作以隔离具有预分配符号率的下变频数字信号; 成形器，被配置为恢复CIC输出信号的I和Q分量的原始频谱; 以及CIC调谐器环路滤波器，其被配置为将由粗频率估计块频率偏移估计的频率插入到载波环路中，以完成预分配的输入数字信号的载波恢复。

8. 发明授权

US07161989B1 CIC qam modulator 失效
标题翻译： CIC qam调制器
公开(公告)号：US07161989B1
公开(公告)日：2007-01-09
申请号：US10402788
申请日：2003-03-29
申请人： David Bruce Isaksen , Mark Fong
发明人： David Bruce Isaksen , Mark Fong
IPC分类号： H04L27/04
CPC分类号： H04L25/05 , H03C3/40 , H04L27/362 , H04L27/364
摘要： An apparatus for modulating a digital input signal having a pre-assigned symbol rate and having a baseband carrier frequency by using a single sample clock signal. The pre-assigned symbol rate is selected from the group consisting of a plurality of symbol rates. The apparatus in a baseband mode comprises: (a) an Interpolate_by_2_Nyquist Filter block configured to double the pre-assigned symbol rate, to perform Nyquist filtering operation, and configured to output an Inphase (I) and a Quadrature (Q) components of the pre-assigned signal having the double symbol rate; (b) a Complex Shaper block configured to pre-compensate the spectrum of I and Q components of the signal having the double symbol rate in advance for a spectrum distortion caused by the apparatus; ©) a Cascaded Integrated Comb (CIC) Interpolator filter configured to increase by an interpolation R factor the sample rate of the signal as compared with a sample rate of the baseband carrier; (d) a Phase Shifter configured to compensate a phase of interpolated by R signal for a known quadrature error; (e) an Inphase (I) channel and Quadrature (Q) channel Gain blocks configured to pre-compensate the I and Q components of the interpolated by R signal for a known gain difference circuit between the I and Q channel gains; (f) an I and Q channel DC offset blocks configured to pre-compensate I and Q components of the interpolated by R signal for a known DC offset difference circuit between I and Q channel DC offset blocks; and (g) a Controller block configured to supply a plurality of control signals to the apparatus. In the passband mode, I and Q channel Gains are set to one, and I and Q channel DC offsets are set to zero.
摘要翻译：一种用于通过使用单个采样时钟信号来调制具有预分配码元速率并具有基带载波频率的数字输入信号的装置。从由多个符号率组成的组中选择预分配符号率。基带模式的装置包括：（a）Interpolate_by_2_Nyquist滤波器块，被配置为使预先分配的符号速率加倍，以执行奈奎斯特滤波操作，并且被配置为输出预先分配的符号速率的同相（I）和正交（Q）分量具有双符号率的分配信号; （b）复杂整形器块，被配置为对由所述装置引起的频谱失真预先补偿具有双符号速率的信号的I和Q分量的频谱; （C））级联集成梳状（CIC）插值器滤波器，其被配置为与基带载波的采样率相比增加信号的采样率的内插R因子; （d）移相器，被配置为针对已知的正交误差补偿由R信号内插的相位; （e）同相（I）通道和正交（Q）通道增益块，其被配置为对I和Q通道增益之间的已知增益差电路预先补偿由R信号内插的I和Q分量; （f）I和Q通道DC偏移块，被配置为对I和Q通道DC偏移块之间的已知DC偏移差分电路预先补偿由R信号内插的I和Q分量; 以及（g）被配置为向所述装置提供多个控制信号的控制器块。在通带模式下，I和Q通道增益设置为1，I和Q通道DC偏移设置为零。

9. 发明授权

US07012972B1 Minimization of phase equivocation in burst modems 失效
标题翻译：突发调制解调器中相位偏差的最小化
公开(公告)号：US07012972B1
公开(公告)日：2006-03-14
申请号：US10134245
申请日：2002-04-27
申请人： David Bruce Isaksen , Byron Esten Danzer , Mark Fong
发明人： David Bruce Isaksen , Byron Esten Danzer , Mark Fong
IPC分类号： H04L27/14
CPC分类号： H04L27/2331 , H04L27/0014 , H04L2027/0024 , H04L2027/0053 , H04L2027/0069 , H04L2027/0073
摘要： In a system comprising a subscriber (sub) carrier tracking loop and a hub carrier tracking loop, a method and apparatus for resolving phase equivocation. The method comprises the following steps: (A) acquiring a phase and a frequency of a hub carrier frequency by utilizing the sub carrier tracking loop; (B) estimating an instant absolute frequency offset between a received symbol point and a corresponding plant point; (C) averaging the instant absolute frequency offset over a plurality of received symbols; (D) storing the averaged estimated frequency offset in a frequency register of the sub carrier tracking loop; (E) locking the sub carrier tracking loop on the hub carrier frequency by compensating for the stored averaged estimated frequency offset; (F) estimating an instant absolute phase error between a received symbol point and a corresponding plant point; (G) averaging the instant absolute phase error over a plurality of received symbols; (H) resolving phase equivocation by adjusting the averaged absolute phase error, if the averaged absolute phase error is at least equal to a predetermined equivocation phase threshold; and (I) completing the tracking of the hub carrier frequency by the locked sub carrier tracking loop.
摘要翻译：在包括用户（子）载波跟踪环路和集线器载波跟踪环路的系统中，一种用于解决相位偏差的方法和装置。该方法包括以下步骤：（A）通过利用副载波跟踪环来获取集线器载波频率的相位和频率; （B）估计接收到的符号点和对应植物点之间的瞬时绝对频率偏移; （C）对多个接收符号的瞬时绝对频率偏移进行平均; （D）将平均估计频率偏移存储在子载波跟踪环路的频率寄存器中; （E）通过补偿所存储的平均估计频率偏移来将子载波跟踪环锁定在集线器载波频率上; （F）估计接收到的符号点和相应植物点之间的瞬时绝对相位误差; （G）在多个接收到的符号上平均瞬时绝对相位误差; （H）如果平均的绝对相位误差至少等于预定的等式相位阈值，则通过调整平均绝对相位误差来解决相位偏差; 和（I）通过锁定子载波跟踪环完成对于载波频率的跟踪。

10. 发明授权

US06973141B1 Flexible multimode QAM modulator 失效
标题翻译：灵活多模QAM调制器
公开(公告)号：US06973141B1
公开(公告)日：2005-12-06
申请号：US09972180
申请日：2001-10-04
申请人： David Bruce Isaksen , Byron Esten Danzer , Mark Fong
发明人： David Bruce Isaksen , Byron Esten Danzer , Mark Fong
IPC分类号： H04L25/03 , H04L27/00 , H04L27/20 , H04L27/34 , H04L27/36
CPC分类号： H04L25/03834 , H04L27/0008 , H04L27/3488 , H04L27/364 , H04L27/367
摘要： A method of baseband/passband digital modulation for a data transmission system wherein a plurality of data symbols is transmitted over a transmission channel at a symbol rate. The method comprises the following steps: (1) generating a plurality of I and Q components of symbols by mapping an input bit stream comprising a plurality of digital codewords into a QAM constellation; (2) selecting a passband or a baseband mode; and (3) generating an analog output signal in the passband or baseband mode. The step of selecting the passband or the baseband mode depends on the complexity of QAM constellation. If QAM constellation includes less than 64 QAM plant points, the passband mode is selected, and if QAM constellation includes more than 64 QAM plant points, the baseband mode is selected. If the QAM constellation includes less than 64 QAM plant points, initially selecting the passband mode until a D/A conversion speed reaches a maximum passband conversion speed, and until an output symbol rate reaches a maximum passband symbol output rate, and subsequently switching to the baseband mode in order to double the maximum passband conversion speed and to double the maximum passband symbol output rate.
摘要翻译：一种用于数据传输系统的基带/通带数字调制方法，其中通过传输信道以符号速率发送多个数据符号。该方法包括以下步骤：（1）通过将包括多个数字码字的输入比特流映射到QAM星座中来产生符号的多个I和Q分量; （2）选择通带或基带模式; 和（3）在通带或基带模式中产生模拟输出信号。选择通带或基带模式的步骤取决于QAM星座的复杂度。如果QAM星座包含少于64个QAM工厂点，则选择通带模式，如果QAM星座包含超过64个QAM工厂点，则选择基带模式。如果QAM星座包括小于64个QAM工厂点，则首先选择通带模式，直到D / A转换速度达到最大通带转换速度，并且直到输出符号速率达到最大通带符号输出速率，并且随后切换到基带模式，以便将最大通带转换速度加倍，并将双通道带符号输出速率提高一倍。

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