公开(公告)号：US06411225B1

公开(公告)日：2002-06-25

申请号：US09552649

申请日：2000-04-19

申请人： Adrianus Wilhelmus Maria Van Den Enden ,  Rutgerus Elisabertus Eduardus Franciscus Suermondt ,  Marc Victor Arends

发明人： Adrianus Wilhelmus Maria Van Den Enden ,  Rutgerus Elisabertus Eduardus Franciscus Suermondt ,  Marc Victor Arends

IPC分类号： H03M700

CPC分类号： H03H17/0286 ,  H03H17/0273 ,  H03H17/0621 ,  H03H17/0628 ,  H03H17/0642

摘要： Sample rate converters are known, and are used to convert a signal with a first sample rate (sampling frequency) into a signal with a second sample rate (sampling frequency). To obtain a flexible sample rate converter with sampling frequencies that are not known beforehand, until now only sample rate converters with very high intermediate sampling frequencies are known. The invention provides a flexible sample rate converter, which is able to handle unknown input and output sampling frequencies. This is achieved by using polyphase decomposition filter means in combination with interpolation means.

摘要翻译： 采样率转换器是已知的，并且用于将具有第一采样率（采样频率）的信号转换成具有第二采样率（采样频率）的信号。 为了获得具有预先不知道的采样频率的灵活采样率转换器，到目前为止，已知仅具有非常高的中间采样频率的采样率转换器。 本发明提供了一种灵活的采样率转换器，其能够处理未知的输入和输出采样频率。 这通过使用多相分解滤波器装置与插值装置组合来实现。

公开(公告)号：US07376690B2

公开(公告)日：2008-05-20

申请号：US10495583

申请日：2002-10-24

申请人： Adrianus Wilhelmus Maria Van Den Enden ,  Marc Victor Arends

发明人： Adrianus Wilhelmus Maria Van Den Enden ,  Marc Victor Arends

IPC分类号： G06F17/17

CPC分类号： H03H17/0276 ,  H03H17/0288 ,  H03H17/045 ,  H03H17/0657 ,  H03H17/0664 ,  H03H17/0685

摘要： A time discrete filter comprises a sampling rate converter provided with an input and an output, and a down-sampler having a down-sampling factor nd. The time discrete filter further comprises an up-sampler having an up-sampling factor nu, whereby the up-sampler is coupled to the converter input, and the converter output is coupled to the down-sampler. It has been found that if a sampling rate conversion operation is preceded by an up-sampling operation and only after the conversion is followed by a down-sampling operation to a wanted sampling frequency, that then the complexity in terms of the ultimate number of calculations, in particular multiplications and additions, is reduced. This leads to a decrease of the number of instructions per second which is a measure for the complexity of a Digital Signal Processing (DSP) algorithm. In addition this leads to an associated decrease of power consumed by a DSP, such as applied in for example audio, video, and (tele)communication devices, as well as radio and television apparatus.

摘要翻译： 时间离散滤波器包括具有输入和输出的采样率转换器和具有下采样因子nd的下采样器。 时间离散滤波器还包括具有上采样因子nu的上采样器，由此上取样器耦合到转换器输入，并且转换器输出耦合到下采样器。 已经发现，如果采样率转换操作之前是上采样操作，并且仅在转换之后是对所需采样频率的下采样操作，那么在最终计算数量方面的复杂性 ，特别是乘法和加法，减少了。 这导致每秒指令数量的减少，这是数字信号处理（DSP）算法的复杂度的度量。 此外，这导致DSP所消耗的功率相关联的降低，例如应用于例如音频，视频和（远程）通信设备以及无线电和电视设备中。

公开(公告)号：US07336208B2

公开(公告)日：2008-02-26

申请号：US10550875

申请日：2004-03-24

申请人： Adrianus Wilhelmus Maria Van Den Enden ,  Marc Victor Arends

发明人： Adrianus Wilhelmus Maria Van Den Enden ,  Marc Victor Arends

IPC分类号： H03M7/00

CPC分类号： H03H17/0685 ,  H03H17/0294

摘要： Sample rate converters (12) for converting input sample rates (F81) of signals into output sample rates (Fs4) are provided with sample rate adapters (3,6) for adapting (basic idea) intermediate sample rates (Fs2) such that output sample rates (Fs4) are larger (upsampling) or smaller (downsampling) than input sample rates (F81), to reduce their complexity and to avoid bookkeeping and structure switching problems. Sample rate adapters (3,6) in the form of variable sample rate decreasers (3) allow the sample rate converters (12) to be used in video applications requiring DC-out being equal to DC-in. Sample rate adapters (3,6) in the form of variable sample rate increasers (6) allow the sample rate converters (12) to be used in audio applications. By locating the sample rate adapter (3,6) between a fixed sample rate increaser (1) for increasing with a factor K and a fixed sample rate decreaser (5) for decreasing with a factor M, filters (2,4) in between can be designed independently from the varying factor L as long as K and M are fixed and L

摘要翻译： 将采样速率转换器（12）用于将信号的输入采样率（F 81）变换成输出采样率（F S s S S S S S S N） 用于适应（基本思想）中间采样率（F S2），使得输出采样率（F S S S S S S）比输入更大（上采样）或更小（下采样） 采样率（F 81），以降低它们的复杂性并避免记帐和结构切换问题。 可变采样率降压器（3）形式的采样率适配器（3,6）允许采样率转换器（12）用于需要DC-out等于DC-in的视频应用中。 可变采样率增加器（6）形式的采样率适配器（3,6）允许采样率转换器（12）用于音频应用。 通过将采样率适配器（3,6）定位在用因子K增加的固定采样率增加器（1）和以因子M减小的固定采样率递减器（5）之间，滤波器（2,4）在 只要K和M是固定的，可以独立于变化因子L设计，并且 / SUP> -K。

公开(公告)号：US06760740B2

公开(公告)日：2004-07-06

申请号：US09897366

申请日：2001-07-02

申请人： Adrianus Wilhelmus Maria Van Den Enden ,  Eric Kathmann

发明人： Adrianus Wilhelmus Maria Van Den Enden ,  Eric Kathmann

IPC分类号： G06F1710

CPC分类号： G10L25/48 ,  G10L25/24

摘要： In a method of encoding a source signal by determining Line Spectral Frequencies (LSFs) for representing Linear Predictive Coding (LPC) filter coefficients, real zeros are determined in associated polynomials P″ and Q″ in cos(m&ohgr;), with each polynomial being a series of Chebyshev polynomials, a search for real zeroes being performed by evaluating the associated polynomials in a series of steps of a real variable u, an approximation of cos(m&ohgr;) as a function of the real variable u being employed.

摘要翻译： 在通过确定用于表示线性预测编码（LPC）滤波器系数的线谱频率（LSF））来对源信号进行编码的方法中，在cos（momega）中的相关多项式P“和Q”中确定实数为零，每个多项式 作为一系列切比雪夫多项式，通过在实数u的一系列步骤中评估相关联的多项式来执行真实零的搜索，作为使用的真实变量u的函数的cos（momega）的近似。