公开(公告)号：US20120014426A1

公开(公告)日：2012-01-19

申请号：US13254397

申请日：2009-03-31

申请人： Kameran Azadet ,  Samer Hijazi ,  Joseph H. Othmer

发明人： Kameran Azadet ,  Samer Hijazi ,  Joseph H. Othmer

IPC分类号： H04B17/00

CPC分类号： H03M7/3042 ,  H03M7/3024

摘要： Methods and apparatus are provided for direct synthesis of RF signals using a delta-sigma modulator. An RF signal is synthesized from an input signal by quantizing the input signal using a quantizer, such as a one bit quantizer; determining a quantization error associated with the quantizer; generating an error prediction value using an error predictive filter, wherein the error predictive filter comprises one or more filter zeroes on a unit circle for one or more desired frequencies of f1, f2, . . . fn and one or more filter poles having a magnitude inside the unit circle and a frequency substantially equal to the one or more desired frequencies of f1, f2, . . . fn; and subtracting the error prediction value from the input signal. The filter poles have a magnitude that reduces a boost provided out-of-band.

摘要翻译： 提供了使用Δ-Σ调制器直接合成RF信号的方法和装置。 通过使用诸如一位量化器的量化器量化输入信号，从输入信号合成RF信号; 确定与所述量化器相关联的量化误差; 使用误差预测滤波器生成误差预测值，其中所述误差预测滤波器包括在f1，f2的一个或多个期望频率的单位圆上的一个或多个滤波器零点。 。 。 fn和一个或多个具有在单位圆内的幅度的滤波器极，并且频率基本上等于f1，f2的一个或多个期望频率。 。 。 fn 并从输入信号中减去误差预测值。 滤波器极具有降低带外提升的幅度。

公开(公告)号：US07834788B2

公开(公告)日：2010-11-16

申请号：US12415012

申请日：2009-03-31

申请人： Kameran Azadet ,  Samer Hijazi ,  Joseph H. Othmer

发明人： Kameran Azadet ,  Samer Hijazi ,  Joseph H. Othmer

IPC分类号： H03M3/00

CPC分类号： H03M7/3006 ,  H03M7/3042

摘要： Methods and apparatus are provided for decorrelating quantization noise in a delta-sigma modulator. An input signal is quantized using a predictive delta-sigma modulator, by quantizing the input signal using a quantizer; determining a quantization error associated with the quantizer by subtracting an input to the quantizer from an output of the quantizer; measuring a correlation coefficient between the quantization error and an input to the quantizer; reducing the measured correlation by subtracting a multiple of the input to the quantizer from the quantization error, wherein the multiple is based on the correlation coefficient; generating an error prediction value using an error predictive filter; and subtracting the error prediction value from the input signal.

摘要翻译： 提供了用于在Δ-Σ调制器中去量化量化噪声的方法和装置。 使用预测Δ-Σ调制器通过使用量化器量化输入信号来量化输入信号; 通过从量化器的输出中减去量化器的输入来确定与量化器相关联的量化误差; 测量量化误差与量化器的输入之间的相关系数; 通过从所述量化误差中减去所述量化器的输入的倍数来减少所测量的相关性，其中所述多个是基于所述相关系数; 使用误差预测滤波器生成误差预测值; 并从输入信号中减去误差预测值。

公开(公告)号：US20130080855A1

公开(公告)日：2013-03-28

申请号：US13247439

申请日：2011-09-28

申请人： Samer Hijazi ,  Carl Murray ,  Joseph H. Othmer ,  Albert Molina ,  Kameran Azadet

发明人： Samer Hijazi ,  Carl Murray ,  Joseph H. Othmer ,  Albert Molina ,  Kameran Azadet

IPC分类号： H03M13/13 ,  G06F11/10

CPC分类号： H03M13/451 ,  H03M13/13 ,  H03M13/6502

摘要： A search sphere-based linear block decoder is provided. A received vector, v, is decoded by computing a syndrome vector, S, corresponding to the received vector, v; (S=vH); obtaining a set of all possible error vectors, e, corresponding to the computed syndrome vector, S, wherein the set of all possible error vectors, e, is obtained from a pre-computed error table and has a specified maximum number of bit errors; calculating a set of all possible received vectors, x, based on the received vector, v, and the set of all possible error vectors, e; determining a k-bit code-vector x that is closest to the received vector, v; and determining an n-bit data-vector, d, associated with the k-bit code-vector x. The pre-computed error table can be generated by multiplying all possible error vectors by a Syndrome Matrix, to obtain all possible syndrome vectors associated with all possible error vectors.

摘要翻译： 提供基于搜索范围的线性块解码器。 通过计算对应于接收向量v的校正子向量S来解码接收向量v， （S = vH）; 获得对应于所计算的校正子向量S的所有可能的误差向量集合，其中所有可能的误差向量集合e从预先计算的误差表获得并且具有指定的最大数量的比特错误; 基于所接收的向量v和所有可能的误差向量的集合e来计算所有可能的接收向量x的集合; 确定最接近接收矢量的k位码矢量，v; 以及确定与所述k位码矢量x相关联的n位数据矢量d。 可以通过将所有可能的误差向量乘以综合征矩阵来产生预计算误差表，以获得与所有可能的误差向量相关联的所有可能的校正子向量。

公开(公告)号：US5220325A

公开(公告)日：1993-06-15

申请号：US676633

申请日：1991-03-28

申请人： Bryan D. Ackland ,  Hemant Bheda ,  Joseph H. Othmer

发明人： Bryan D. Ackland ,  Hemant Bheda ,  Joseph H. Othmer

IPC分类号： H03M7/40 ,  G06T9/00 ,  H03M7/42 ,  H04N7/08 ,  H04N7/26 ,  H04N7/50 ,  H04N19/00 ,  H04N21/434 ,  H04N21/4788

CPC分类号： H04N21/4344 ,  H03M7/425 ,  H04N19/00 ,  H04N19/61 ,  H04N19/98 ,  H04N21/4348 ,  H04N7/08 ,  H04N19/70 ,  H04N21/4788

摘要： Efficient decoding of an hierarchical, variable length, encoded data sequence containing embedded uncoded data into a sequence of fixed length instructions for subsequent processing by a digital video processor or the like is realized in an apparatus including a decoder having a plurality of variable length code decoding elements and a control structure embedded within each decoding element for transferring the decoding operation to an appropriate one of the decoding elements in response to a prior output from the decoder element. As the encoded data sequence is processed by the apparatus, a predetermined length of the sequence is stored in a register. The control structure further responds to the encoded data sequence to initiate selection of either the predetermined length of the sequence stored in the register or a portion of the decoder output as the fixed length instruction to be output by the apparatus.

公开(公告)号：US20140108477A1

公开(公告)日：2014-04-17

申请号：US13701376

申请日：2012-10-26

申请人： Kameran Azadet ,  Meng-Lin Yu ,  Joseph H. Othmer ,  Joseph Williams ,  Albert Molina

发明人： Kameran Azadet ,  Meng-Lin Yu ,  Joseph H. Othmer ,  Joseph Williams ,  Albert Molina

IPC分类号： G06F5/01

CPC分类号： G06F9/3001 ,  G06F5/01 ,  G06F9/30036 ,  G06F17/15 ,  H03F1/0288 ,  H03F1/3241 ,  H03F1/3258 ,  H03F3/189 ,  H03F3/24 ,  H03F2200/336 ,  H03F2201/3209 ,  H03F2201/3212 ,  H03F2201/3224 ,  H03F2201/3233 ,  H03H17/06 ,  H03M3/30 ,  H04B1/0003 ,  H04B1/0475 ,  H04B1/62 ,  H04B2001/0408 ,  H04L1/0054 ,  H04L25/02 ,  H04L25/03 ,  H04L25/03178 ,  H04L25/03216 ,  H04L25/4917 ,  H04L27/2334

摘要： A vector processor is provided having an instruction set with a vector convolution function. The disclosed vector processor performs a convolution function between an input signal and a filter impulse response by obtaining a vector comprised of at least N1+N2-1 input samples; obtaining N2 time shifted versions of the vector (including a zero shifted version), wherein each time shifted version comprises Ni samples; and performing a weighted sum of the time shifted versions of the vector by a vector of Ni coefficients; and producing an output vector comprising one output value for each of the weighted sums. The vector processor performs the method, for example, in response to one or more vector convolution software instructions having a vector input. The vector can comprise a plurality of real or complex input samples and the filter impulse response can be expressed using a plurality of coefficients that are real or complex.

摘要翻译： 提供了具有具有向量卷积函数的指令集的向量处理器。 所公开的向量处理器通过获得包括至少N1 + N2-1个输入样本的向量来执行输入信号和滤波器脉冲响应之间的卷积函数; 获得矢量的N2时移版本（包括零位版本），其中每个时移版本包括Ni样本; 以及通过Ni系数的向量来执行向量的时移版本的加权和; 以及产生包括每个加权和的一个输出值的输出向量。 矢量处理器例如响应于具有矢量输入的一个或多个向量卷积软件指令来执行该方法。 矢量可以包括多个实数或复数输入样本，并且可以使用实数或复数的多个系数来表示滤波器脉冲响应。

公开(公告)号：US08595604B2

公开(公告)日：2013-11-26

申请号：US13247439

申请日：2011-09-28

申请人： Samer Hijazi ,  Carl Murray ,  Joseph H. Othmer ,  Albert Molina ,  Kameran Azadet

发明人： Samer Hijazi ,  Carl Murray ,  Joseph H. Othmer ,  Albert Molina ,  Kameran Azadet

IPC分类号： H03M13/00

CPC分类号： H03M13/451 ,  H03M13/13 ,  H03M13/6502

摘要： A search sphere-based linear block decoder is provided. A received vector, v, is decoded by computing a syndrome vector, S, corresponding to the received vector, v; (S=vH); obtaining a set of all possible error vectors, e, corresponding to the computed syndrome vector, S, wherein the set of all possible error vectors, e, is obtained from a pre-computed error table and has a specified maximum number of bit errors; calculating a set of all possible received vectors, x, based on the received vector, v, and the set of all possible error vectors, e; determining a k-bit code-vector x that is closest to the received vector, v; and determining an n-bit data-vector, d, associated with the k-bit code-vector x. The pre-computed error table can be generated by multiplying all possible error vectors by a Syndrome Matrix, to obtain all possible syndrome vectors associated with all possible error vectors.

摘要翻译： 提供基于搜索范围的线性块解码器。 通过计算对应于接收向量v的校正子向量S来解码接收向量v， （S = vH）; 获得对应于所计算的校正子向量S的所有可能的误差向量集合，其中所有可能的误差向量集合e从预先计算的误差表获得并且具有指定的最大数量的比特错误; 基于所接收的向量v和所有可能的误差向量的集合e来计算所有可能的接收向量x的集合; 确定最接近接收矢量的k位码矢量，v; 以及确定与所述k位码矢量x相关联的n位数据矢量d。 可以通过将所有可能的误差向量乘以综合征矩阵来产生预计算误差表，以获得与所有可能的误差向量相关联的所有可能的校正子向量。

公开(公告)号：US08633842B2

公开(公告)日：2014-01-21

申请号：US13254397

申请日：2009-03-31

申请人： Kameran Azadet ,  Samer Hijazi ,  Joseph H. Othmer

发明人： Kameran Azadet ,  Samer Hijazi ,  Joseph H. Othmer

IPC分类号： H03M3/00

CPC分类号： H03M7/3042 ,  H03M7/3024

摘要： Methods and apparatus are provided for direct synthesis of RF signals using a delta-sigma modulator. An RF signal is synthesized from an input signal by quantizing the input signal using a quantizer, such as a one bit quantizer; determining a quantization error associated with the quantizer; generating an error prediction value using an error predictive filter, wherein the error predictive filter comprises one or more filter zeroes on a unit circle for one or more desired frequencies of f1, f2, . . . fn and one or more filter poles having a magnitude inside the unit circle and a frequency substantially equal to the one or more desired frequencies of f1, f2, . . . fn; and subtracting the error prediction value from the input signal. The filter poles have a magnitude that reduces a boost provided out-of-band.

摘要翻译： 提供了使用Δ-Σ调制器直接合成RF信号的方法和装置。 通过使用诸如一位量化器的量化器量化输入信号，从输入信号合成RF信号; 确定与所述量化器相关联的量化误差; 使用误差预测滤波器生成误差预测值，其中所述误差预测滤波器包括在f1，f2的一个或多个期望频率的单位圆上的一个或多个滤波器零点。 。 。 fn和一个或多个具有在单位圆内的幅度的滤波器极，并且频率基本上等于f1，f2的一个或多个期望频率。 。 。 fn 并从输入信号中减去误差预测值。 滤波器极具有降低带外提升的幅度。

公开(公告)号：US07868798B2

公开(公告)日：2011-01-11

申请号：US12414999

申请日：2009-03-31

申请人： Kameran Azadet ,  Samer Hijazi ,  Joseph H. Othmer

发明人： Kameran Azadet ,  Samer Hijazi ,  Joseph H. Othmer

IPC分类号： H03M1/20

CPC分类号： H03M7/3008 ,  H03M7/3028 ,  H03M7/3042

摘要： Methods and apparatus are provided for whitening quantization noise in a delta-sigma modulator using a dither signal. An input signal is quantized using a predictive delta-sigma modulator by quantizing the input signal using a quantizer; adding a dither signal at a first location of the predictive delta-sigma modulator; determining a quantization error associated with the quantizer; removing the dither signal at a second location of the predictive delta-sigma modulator (for example, by subtracting a substantially similar version of the dither signal at the second location); generating an error prediction value using an error predictive filter; and subtracting the error prediction value from the input signal. The dither signal may be a white noise signal and may optionally be generated using a pseudo-random number generator.

摘要翻译： 提供了使用抖动信号在Δ-Σ调制器中增白量化噪声的方法和装置。 使用量化器对输入信号进行量化，使用预测Δ-Σ调制器对输入信号进行量化; 在预测Δ-Σ调制器的第一位置添加抖动信号; 确定与所述量化器相关联的量化误差; 在预测Δ-Σ调制器的第二位置处去除抖动信号（例如，通过减去第二位置处的抖动信号的基本相似的版本）; 使用误差预测滤波器生成误差预测值; 并从输入信号中减去误差预测值。 抖动信号可以是白噪声信号，并且可以可选地使用伪随机数发生器来产生。

公开(公告)号：US20100245137A1

公开(公告)日：2010-09-30

申请号：US12415003

申请日：2009-03-31

申请人： Kameran Azadet ,  Samer Hijazi ,  Joseph H. Othmer

发明人： Kameran Azadet ,  Samer Hijazi ,  Joseph H. Othmer

IPC分类号： H03M3/00

CPC分类号： H03M7/3042

摘要： Methods and apparatus are provided for look-ahead block processing in predictive delta-sigma modulators. An input signal is quantized using a predictive delta-sigma modulator by generating error prediction values for a current block of input values based on a linear combination of error prediction values from one or more previous blocks, input values of one or more previous blocks, quantized values of one or more previous blocks and the current block of input values; computing speculative error prediction values for at least one input value in the current block, wherein the speculative error prediction values are computed for a plurality of possible quantizer output values; selecting one of the speculative error prediction values based on a quantized value from the current block; and subtracting the error prediction values for the current block from the corresponding current block of input values.

摘要翻译： 提供了用于预测Δ-Σ调制器中的先行块处理的方法和装置。 基于来自一个或多个先前块的误差预测值的线性组合，一个或多个先前块的输入值，量化的输入信号，通过使用预测Δ-Σ调制器来量化当前块的输入值的误差预测值 一个或多个先前块的值和当前的输入值块; 计算当前块中的至少一个输入值的推测误差预测值，其中针对多个可能的量化器输出值计算推测误差预测值; 基于来自当前块的量化值选择推测性误差预测值之一; 以及从相应的当前输入值块中减去当前块的误差预测值。

公开(公告)号：US20100245136A1

公开(公告)日：2010-09-30

申请号：US12414999

申请日：2009-03-31

申请人： Kameran Azadet ,  Samer Hijazi ,  Joseph H. Othmer

发明人： Kameran Azadet ,  Samer Hijazi ,  Joseph H. Othmer

IPC分类号： H03M3/00 ,  H03M1/06

CPC分类号： H03M7/3008 ,  H03M7/3028 ,  H03M7/3042

摘要： Methods and apparatus are provided for whitening quantization noise in a delta-sigma modulator using a dither signal. An input signal is quantized using a predictive delta-sigma modulator by quantizing the input signal using a quantizer; adding a dither signal at a first location of the predictive delta-sigma modulator; determining a quantization error associated with the quantizer; removing the dither signal at a second location of the predictive delta-sigma modulator (for example, by subtracting a substantially similar version of the dither signal at the second location); generating an error prediction value using an error predictive filter; and subtracting the error prediction value from the input signal. The dither signal may be a white noise signal and may optionally be generated using a pseudo-random number generator.

摘要翻译： 提供了使用抖动信号在Δ-Σ调制器中增白量化噪声的方法和装置。 使用量化器对输入信号进行量化，使用预测Δ-Σ调制器对输入信号进行量化; 在预测Δ-Σ调制器的第一位置添加抖动信号; 确定与所述量化器相关联的量化误差; 在预测Δ-Σ调制器的第二位置处去除抖动信号（例如，通过减去第二位置处的抖动信号的基本相似的版本）; 使用误差预测滤波器生成误差预测值; 并从输入信号中减去误差预测值。 抖动信号可以是白噪声信号，并且可以可选地使用伪随机数发生器来产生。