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21. 发明申请

US20060012500A1 Overload protection for look-ahead delta sigma modulators 有权
公开(公告)号：US20060012500A1
公开(公告)日：2006-01-19
申请号：US11090372
申请日：2005-03-25
申请人： John Melanson
发明人： John Melanson
IPC分类号： H03M3/00
CPC分类号： H03M3/366 , H03M3/43 , H03M3/438
摘要： Look-ahead delta sigma modulators of the signal processing systems described herein can anticipate quantizer overload. By anticipating quantizer overload, the look-ahead delta sigma modulators can select an output value y(n) that may have a lower SNR but will prevent quantizer overload in the future. A quantizer overload protection process determines the amount of look-ahead depth to drive state variables of a loop filter of the look-ahead delta sigma modulator to values that would prevent future quantizer overload. By substituting a quantizer of the look-ahead delta sigma modulator with a gain and determining a closed loop impulse response of a look-ahead delta-sigma modulator, the discrete time to achieve an absolute value maximum closed loop response magnitude of the look-ahead delta-sigma modulator has been determined to be directly related to the look-ahead depth that will prevent future quantizer overload.

22. 发明申请

US20050156772A1 Look-ahead delta sigma modulators with quantizer input approximations 失效
标题翻译：具有量化器输入近似的前瞻三角Σ调制器
公开(公告)号：US20050156772A1
公开(公告)日：2005-07-21
申请号：US11037316
申请日：2005-01-18
申请人： John Melanson
发明人： John Melanson
IPC分类号： H03M3/00 , H03M7/00
CPC分类号： H03M7/3011
摘要： A signal processing system includes a look-ahead delta sigma modulator having an approximation generator to approximate quantizer input signals. A look-ahead delta-sigma modulator can be implemented as a noise shaping filter and a quantizer. The quantizer can be implemented as a function generator. State variables of the noise shaping filter provide the input data from which the function generator determines a quantizer output signal. Latter state variables are more dominant in determining the quantizer output signal. Accordingly, earlier state variables can be approximated to a greater degree than earlier state variables. The approximations can result in slightly lower output signal accuracy but can significantly decrease implementation cost. Additionally, latter state variables can completely dominate (i.e., be deterministic) the quantizer output signal. This situation can result in a further, slight increase in the non-linearity of one or more quantization region boundaries.
摘要翻译：信号处理系统包括具有近似量化器输入信号的近似发生器的前瞻三角Σ调制器。先行的delta-sigma调制器可以被实现为噪声整形滤波器和量化器。量化器可以被实现为函数发生器。噪声整形滤波器的状态变量提供函数发生器从该输入数据确定量化器输出信号的输入数据。后期状态变量在确定量化器输出信号时更为主导。因此，早期状态变量可以比较早的状态变量更大程度地近似。近似值可以导致稍低的输出信号精度，但可以显着降低实施成本。另外，后一状态变量可以完全支配量化器输出信号（即，确定性）。这种情况可能导致一个或多个量化区域边界的非线性进一步轻微增加。

23. 发明申请

US20050156768A1 Look-ahead delta sigma modulator with quantization using natural and pattern loop filter responses 失效
标题翻译：具有使用自然和模式环路滤波器响应的量化的前瞻delta-Σ调制器
公开(公告)号：US20050156768A1
公开(公告)日：2005-07-21
申请号：US10995731
申请日：2004-11-22
申请人： John Melanson
发明人： John Melanson
IPC分类号： H03M3/02 , H03M7/00 , H03M7/32 , H03M3/00
CPC分类号： H03M7/3011
摘要： A look-ahead delta sigma modulator reduces and simplifies the computations used to generate quantizer output values. Superposition can be applied to a loop filter response of the look-ahead delta sigma modulator. By superposition, the complete loop filter response for each output candidate vector equals the difference between a forced pattern response and a natural input signal response. The forced pattern response of the loop filter can be determined from the response to each output candidate vector with an input signal set to zero and loop filter state variables initially set to zero when determining the loop filter response for each output candidate vector. The natural input signal response of the loop filter can be determined from the response to each input signal vector with feedback data set to zero. The forced pattern response is independent of the input signal data and can be determined once for all input signal vectors Xt. The natural input signal response is independent of the feedback data and, therefore, need only be determined once for each output data value.
摘要翻译：先行的delta-Σ调制器减少并简化了用于产生量化器输出值的计算。叠加可以应用于前瞻delta-Σ调制器的环路滤波器响应。通过叠加，每个输出候选矢量的完整环路滤波器响应等于强制模式响应和自然输入信号响应之间的差异。环路滤波器的强制模式响应可以从输入信号设置为零的每个输出候选矢量的响应确定，并且当确定每个输出候选矢量的环路滤波器响应时，环路滤波器状态变量初始设置为零。环路滤波器的自然输入信号响应可以从反馈数据设置为零的每个输入信号矢量的响应来确定。强制模式响应与输入信号数据无关，并且可以针对所有输入信号向量X 确定一次。自然输入信号响应与反馈数据无关，因此只需要为每个输出数据值确定一次。

24. 发明申请

US20050156767A1 Multiple non-monotonic quantizer regions for noise shaping 有权
标题翻译：用于噪声整形的多个非单调量化器区域
公开(公告)号：US20050156767A1
公开(公告)日：2005-07-21
申请号：US10994617
申请日：2004-11-22
申请人： John Melanson
发明人： John Melanson
IPC分类号： H03M3/00 , H03M3/02 , H03M7/32
CPC分类号： H03M7/3013 , H03M7/3011 , H03M7/3028 , H03M7/304
摘要： A signal processing system having a multiple non-monotonic regions quantization transfer function can improve overall delta sigma modulator performance. The non-monotonic quantization transfer function includes multiple quantization level retrograde changeover thresholds. Thus, the quantizer makes retrograde quantization level decisions for predetermined signal levels in multiple non-monotonic regions, i.e., for the ith non-monotonic quantization region 1≦i≦N, N≧2, and quantizer transfer function Q(s), Q(s1i)≦Q(s2i) for a first set of quantizer input signals |s1i|>|s2i| and Q(s3i)≦Q(s4i), for a second set of quantizer input signals |s3i|>|s4i|. The retrograde quantization level decisions for multiple non-monotonic regions, i.e. Q(s3i)≦Q(s4i), for |s3i|>|s4i|, effectively provide positive feedback to the delta sigma modulator input signal for each of the N non-monotonic regions and result in a more carefully defined gain for the delta sigma modulator.
摘要翻译：具有多个非单调区域量化传递函数的信号处理系统可以提高总体ΔΣ调制器性能。非单调量化传递函数包括多个量化级逆向转换阈值。因此，量化器对于多个非单调区域中的预定信号电平进行逆向量化级别决定，即对于第i个非单调量化区域1，i = N，N 2 = 2 ，以及用于第一组量化器输入信号| s 1的量化器传递函数Q（s），Q（s 1）i = Q（S 2＆CenterDot; SUB> i |> | s 2 对于第二组量化器输入信号| s 3 | i | Q |（Q），则Q（s 3）i = Q（S 4＆lt; i＆gt; > | s 4 对于多个非单调区域的逆向量化级别决策，即对于| s 3 i的Q（s 3 i）对于N个非单调区域中的每一个，有效地向ΔΣ调制器输入信号提供正反馈，并且导致三角形的更仔细限定的增益 Σ调制器。

25. 发明申请

US20050156766A1 Signal processing with look-ahead modulator noise quantization minimization 有权
标题翻译：信号处理与前瞻调制器噪声量化最小化
公开(公告)号：US20050156766A1
公开(公告)日：2005-07-21
申请号：US10900877
申请日：2004-07-28
申请人： John Melanson
发明人： John Melanson
IPC分类号： H03M1/12 , H03M3/00 , H03M7/00
CPC分类号： H03M7/3011 , H03M7/3026
摘要： A signal processing system includes a look-ahead delta-sigma modulator that processes multiple output candidate vectors and an input vector to determine a quantization error vector for each output candidate vector. In one embodiment, the quantization error vector represents a difference between a cost value vector and an input candidate vector. Look-ahead delta-sigma modulator output values are selected using the quantization error vectors by, for example, determining the minimum power quantization error vector for each input vector X and selecting the output value from the input candidate vector associated with the minimum power quantization error vector. Quantization error vectors can also be weighted using a non-uniform weighting vector.
摘要翻译：信号处理系统包括处理多输出候选向量的前瞻delta-sigma调制器和输入向量，以确定每个输出候选向量的量化误差向量。在一个实施例中，量化误差矢量表示成本值矢量和输入候选矢量之间的差。通过例如确定每个输入矢量X的最小功率量化误差矢量并且从与最小功率量化误差相关联的输入候选矢量中选择输出值，使用量化误差向量来选择前视Δ-Σ调制器输出值向量。量化误差向量也可以使用不均匀加权矢量进行加权。

26. 发明申请

US20070253583A1 METHOD AND SYSTEM FOR SOUND BEAM-FORMING USING INTERNAL DEVICE SPEAKERS IN CONJUNCTION WITH EXTERNAL SPEAKERS 有权
标题翻译：使用内部设备扬声器连接外部扬声器的声束形成方法和系统
公开(公告)号：US20070253583A1
公开(公告)日：2007-11-01
申请号：US11380840
申请日：2006-04-28
申请人： John Melanson
发明人： John Melanson
IPC分类号： H04R5/02 , H04R1/02
CPC分类号： H04S7/301 , H04R3/12 , H04R3/14 , H04R2201/403 , H04R2430/20
摘要： A method and system for sound beam-forming using internal device speakers in conjunction with external speakers provides a low cost alternative to present external surround array systems. A processing circuit within an audio device or audio/visual (AV) device such as a digital television (DTV) generates signals for internal and external speakers that phase-align the internal speakers with the external speakers for beam-forming. The beam may be a surround beam directed away from a listening position so that surround channel information is only heard as reflections. Alternatively, the beam may be a “night mode” beam that concentrates sound at a particular location or multiple beams may be formed for picture-in-picture or other applications where it is desirable to provide multiple isolated listening locations.
摘要翻译：使用内部设备扬声器结合外部扬声器进行声束形成的方法和系统提供了低成本的替代方式来呈现外部环绕声阵列系统。诸如数字电视（DTV）之类的音频设备或音频/视频（AV）设备内的处理电路产生用于内部和外部扬声器的信号，该内部和外部扬声器使内部扬声器与用于波束形成的外部扬声器相对准。光束可以是远离聆听位置的环绕光束，使得环绕声道信息仅被听到作为反射。或者，光束可以是将声音集中在特定位置处的“夜间模式”光束，或者可以为需要提供多个隔离的收听位置的画中画或其它应用而形成多个光束。

27. 发明申请

US20070146177A1 Sample rate conversion combined with filter 有权
标题翻译：采样率转换结合滤波器
公开(公告)号：US20070146177A1
公开(公告)日：2007-06-28
申请号：US11387093
申请日：2006-03-22
申请人： John Melanson , Stephen Turk
发明人： John Melanson , Stephen Turk
IPC分类号： H03M7/00
CPC分类号： H03H17/0416 , H03H17/0444
摘要： Digital filtering and sample rate conversion blocks are combined in order to reduce hardware and/or computational complexity. Input data samples provided at a first sample rate are converted to output data samples at a second sample rate unequal to the first sample rate. An Infinite Impulse Response filter having internal states are updated at the first sample rate filters the input data samples in, to produce filtered data samples at the first sample rate. Output data samples are output at the second sample rate, where each output data sample is created as the sum of at least two intermediate products, a first intermediate product and a second intermediate product. The first intermediate product is defined by a first function of the internal states multiplied by a first function of the time difference between output samples and internal state updates, and the second intermediate product is defined by a second function of the internal states multiplied by a second function of the time difference between output samples and internal state updates.
摘要翻译：数字滤波和采样率转换块被组合以便降低硬件和/或计算复杂性。以第一采样率提供的输入数据样本以不等于第一采样率的第二采样率转换为输出数据采样。具有内部状态的无限脉冲响应滤波器以第一采样速率更新，对输入数据样本进行滤波，以产生第一采样率的滤波数据样本。以第二采样率输出输出数据样本，其中每个输出数据样本被创建为至少两个中间产品，第一中间产品和第二中间产品的总和。第一中间产品由内部状态的第一函数乘以输出样本和内部状态更新之间的时间差的第一函数而定义，并且第二中间乘积由内部状态的第二函数乘以第二个函数输出样本和内部状态更新之间的时间差的函数。

28. 发明申请

US20070146176A1 Sample rate conversion combined with filter 有权
标题翻译：采样率转换结合滤波器
公开(公告)号：US20070146176A1
公开(公告)日：2007-06-28
申请号：US11318271
申请日：2005-12-23
申请人： John Melanson , Stephen Turk
发明人： John Melanson , Stephen Turk
IPC分类号： H03M7/00
CPC分类号： H03H17/0416 , H03H17/0444
摘要： Digital filtering and sample rate conversion blocks are combined in order to reduce hardware and/or computational complexity. A novel filter design is used to perform sample rate conversion. The filter may be combined with another digital filter. Two embodiments may be used to achieve this function. In a first embodiment, the filter may be clocked at a first (i.e., input) data rate (i.e., before rate conversion). In a second embodiment, the filter may be clocked at the second (i.e., output) data rate (i.e., after rate conversion). In both cases, the filter's basic structure remains essentially the same, but some extra terms are added to handle the rate conversion. The present application is directed toward a sample-rate conversion filter using the output data rate clock as the filter clock.
摘要翻译：数字滤波和采样率转换块被组合以便降低硬件和/或计算复杂性。使用新的滤波器设计来执行采样率转换。滤波器可以与另一数字滤波器组合。可以使用两个实施例来实现该功能。在第一实施例中，滤波器可以以第一（即输入）数据速率（即，在速率转换之前）被计时。在第二实施例中，滤波器可以以第二（即输出）数据速率（即，在速率转换之后）被计时。在这两种情况下，过滤器的基本结构保持基本相同，但添加了一些额外的术语来处理速率转换。本申请涉及使用输出数据速率时钟作为滤波器时钟的采样率转换滤波器。

29. 发明申请

US20070075884A1 Calibration of a redundant number system successive approximation analog-to-digital converter 有权
标题翻译：冗余数字系统逐次逼近模数转换器的校准
公开(公告)号：US20070075884A1
公开(公告)日：2007-04-05
申请号：US11537872
申请日：2006-10-02
申请人： John Melanson , Clinton Wolff
发明人： John Melanson , Clinton Wolff
IPC分类号： H03M1/10
CPC分类号： H03M1/1038 , H03M1/069 , H03M1/1033 , H03M1/468 , H03M1/804
摘要： A system and method calibrate a redundant number system analog-to-digital converter (RNS ADC) using successive approximations of multiple input signals and approximating each input signal at least twice. The RNS ADC includes N analog converter reference elements, each of the analog converter reference elements is associated with a weight in a weight vector W, and N is an integer greater than one. The system and method successively approximate each of M distinct analog input signals twice to generate M respective pairs of successive approximation converter reference element vectors, C1j and C2j,that correspond to digital approximations of the input signals, wherein j ε {0, 1, . . . , M-1}, wherein M is a positive integer. The system and method utilize differences between the successive approximation converter reference element vectors, C1j and C2j to determine a final weight vector WB. Thus, in at least one embodiment, the difference between C1j· WB and C2j· WB can be used to determine the final weight vector WB.
摘要翻译：系统和方法使用多个输入信号的逐次逼近来校准冗余数字系统模数转换器（RNS ADC），并将每个输入信号近似至少两次。 RNS ADC包括N个模拟转换器参考元件，每个模拟转换器参考元件与权重向量 W中的权重相关联，并且N是大于1的整数。该系统和方法连续地近似M个不同的模拟输入信号中的每一个，以产生M个相应的逐次逼近转换器参考元素对，即，OLEYLE =“SLELE”> C 1 < 和 C 对应于数字近似值输入信号，其中j∈{0,1，...，。。，M-1}，其中M是正整数。该系统和方法利用逐次逼近转换器参考元素向量之间的差异，其中 C <1> OSTYLE =“SINGLE”> C j 以确定最终权重向量 W B / SUB>。因此，在至少一个实施例中， > > 之间的差异。 W B B 和 C 。可以使用 W B B来确定最终权重向量“O OYYLE =”SINGLE“> W B B 。

30. 发明申请

US20070003075A1 Level dependent bass management 有权
标题翻译：水平依赖低音管理
公开(公告)号：US20070003075A1
公开(公告)日：2007-01-04
申请号：US11238338
申请日：2005-09-29
申请人： Joel Cooper , John Melanson , Pu Liu
发明人： Joel Cooper , John Melanson , Pu Liu
IPC分类号： H03G5/00
CPC分类号： H04S3/00
摘要： A signal processing system includes a level dependent bass management system. The level dependent bass management system utilizes audio input signal level information to apply at least one of multiple, available bass management solutions to generate one or more output signals from the audio input signal. In at least one embodiment, initially the level dependent bass management system boosts components of the audio input signal in the low frequency range by an amount sufficient to at least partially compensate for low frequency attenuation of the first speaker without exceeding one or more acceptable limitations of the signal processing system. If boosting alone cannot completely compensate for low frequency attenuation of the first speaker without exceeding one or more acceptable limitations of the signal processing system, the level dependent bass management system processes the audio input signal using an alternate low frequency management solution.
摘要翻译：信号处理系统包括一个依赖于电平的低音管理系统。电平依赖低音管理系统利用音频输入信号电平信息来应用多个可用低音管理解决方案中的至少一个以从音频输入信号产生一个或多个输出信号。在至少一个实施例中，电平依赖低音管理系统最初将低频范围内的音频输入信号的分量提升足以至少部分地补偿第一扬声器的低频衰减的量，而不超过一个或多个可接受的限制信号处理系统。如果单独升压不能完全补偿第一扬声器的低频衰减，而不超过信号处理系统的一个或多个可接受的限制，则依赖于电平的低音管理系统使用替代的低频管理解决方案处理音频输入信号。

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