公开(公告)号：US20180175830A1

公开(公告)日：2018-06-21

申请号：US15553909

申请日：2017-01-16

申请人： NTT ELECTRONICS CORPORATION ,  NIPPON TELEGRAPH AND TELEPHONE CORPORATION

发明人： Yasuharu ONUMA ,  Etsushi YAMAZAKI ,  Kazuhito TAKEI ,  Osamu ISHIDA ,  Kengo HORIKOSHI ,  Mitsuteru YOSHIDA ,  Yoshiaki KISAKA ,  Masahito TOMIZAWA

IPC分类号： H03H17/02 ,  H04L7/00

CPC分类号： H03H17/0227 ,  H03H17/0213 ,  H03H17/0275 ,  H03H17/0685 ,  H03H2017/0214 ,  H03H2017/0245 ,  H03H2017/0247 ,  H03H2017/0298 ,  H04L7/0029 ,  H04L7/005 ,  H04L7/0087

摘要： A parallel transfer rate converter inputs first parallel data with number of samples being S1 pieces in synchronism with a first clock, and outputs second parallel data with number of samples being S2=S1×(m/p) pieces (p is an integer equal to or larger than 1) in synchronism with a second clock having a frequency which is p/m times of a frequency of the first clock. A convolution operation device inputs the second parallel data in synchronism with the second clock, generates third parallel data with number of samples being S3=S2×(n/m) pieces (S3 is an integer equal to or larger than 1) by executing a convolution operation with a coefficient indicating a transmission characteristic to the second parallel data, and outputs the third parallel data in synchronism with the second clock.

公开(公告)号：US10002618B2

公开(公告)日：2018-06-19

申请号：US14963228

申请日：2015-12-08

申请人： Microsoft Technology Licensing, LLC

发明人： Thomas Craig Savell

IPC分类号： G10L19/00 ,  G10L19/125 ,  G10L99/00 ,  G06F12/02 ,  G06F12/00 ,  H03H17/06 ,  G10L19/24 ,  G11B20/10

CPC分类号： G10L19/125 ,  G06F3/0604 ,  G06F3/0656 ,  G06F3/0659 ,  G06F3/0673 ,  G06F12/00 ,  G06F12/02 ,  G06F13/28 ,  G06F2213/28 ,  G10L19/24 ,  G10L99/00 ,  G11B20/10037 ,  G11B20/10046 ,  G11B20/10527 ,  G11B2020/10694 ,  G11B2020/10787 ,  G11B2220/2516 ,  H03H17/0642 ,  H03H17/0685

摘要： The subject disclosure is directed towards dynamically computing anti-aliasing filter coefficients for sample rate conversion in digital audio. In one aspect, for each input-to-output sampling rate ratio (pitch) obtained, anti-aliasing filter coefficients are interpolated based upon the pitch (e.g., using the fractional part of the ratio) from two filters (coefficient sets) selected based upon the pitch (e.g., using the integer part of the ratio). The interpolation provides for fine-grained cutoff frequencies, and by re-computation for each pitch, smooth anti-aliasing with dynamically changing ratios.

公开(公告)号：US20160180860A1

公开(公告)日：2016-06-23

申请号：US14757801

申请日：2015-12-23

申请人： QUALCOMM Incorporated

发明人： Minsheng Wang

IPC分类号： G10L19/06 ,  G10L19/26 ,  G10L19/02

CPC分类号： G10L19/06 ,  G10L19/02 ,  G10L19/26 ,  H03H17/028 ,  H03H17/0433 ,  H03H17/0455 ,  H03H17/0642 ,  H03H17/0685

摘要： A method for performing a spline interpolation to up-sample audio data includes up-sampling an input audio signal to generate a first signal having a first frequency. The input audio signal is sampled at an input frequency. The method also includes interpolating data of the first signal to generate a second signal having a second frequency. The data of the first signal is interpolated based on a B-spline interpolation function having at least a fourth order. The method includes down-sampling the second signal to generate an output audio signal having an output frequency. The method further includes updating a time index based on an integer operation that is immune to quantization error for a finite-word length implementation.

摘要翻译： 用于对上采样音频数据执行样条插值的方法包括对输入音频信号进行上采样以产生具有第一频率的第一信号。 输入音频信号以输入频率进行采样。 该方法还包括内插第一信号的数据以产生具有第二频率的第二信号。 基于具有至少四阶的B样条插值函数来内插第一信号的数据。 该方法包括对第二信号进行下采样以产生具有输出频率的输出音频信号。 该方法还包括基于对有限字长度实现的量化误差免疫的整数运算来更新时间索引。

公开(公告)号：US20160094240A1

公开(公告)日：2016-03-31

申请号：US14496980

申请日：2014-09-25

申请人： Anthony Evan O'Shaughnessy ,  Colin Lyden ,  Joseph Peter Canning

发明人： Anthony Evan O'Shaughnessy ,  Colin Lyden ,  Joseph Peter Canning

IPC分类号： H03M1/12

CPC分类号： H03M1/1245 ,  H03H17/0621 ,  H03H17/0642 ,  H03H17/0664 ,  H03H17/0685

摘要： It is known to perform sample rate conversion. A sample rate converter is arranged to receive digital data at an input sample rate Fs and to output data at an output sample rate Fo, where Fo=Fs/N, and N is decimation factor greater than 1. A problem can arise with sample rate converters when a user wishes to change the decimation rate. Generally a sample rate converter needs to discard the samples in its filter when the decimation rate is changed, and the filter output is unusable until the filter has refilled with values taken at the new decimation rate. The sample rate converter provided here does not suffer from this problem. The sample rate converter includes at least Q channels. Each channel comprises a Qth order filter arranged to select input signals at predetermined intervals from a run of P input signals, and to form a weighted sum of the selected input signals to generate an output value, and where the runs of P input signals of one channel are offset from the runs of P signals of the other channels.

摘要翻译： 已知进行采样率转换。 采样率转换器被布置为以输入采样率Fs接收数字数据，并以输出采样率Fo输出数据，其中Fo = Fs / N，N是抽取因子大于1.可能会出现采样率的问题 转换器，当用户希望改变抽取率时。 通常，抽样速率改变时，采样率转换器需要丢弃其滤波器中的样本，并且滤波器输出不可用，直到滤波器用新的抽取率取值为止。 这里提供的采样率转换器不会受到这个问题的困扰。 采样率转换器至少包括Q个通道。 每个通道包括Q阶滤波器，其布置成从P个输入信号的行程中以预定间隔选择输入信号，并且形成所选输入信号的加权和以产生输出值，并且其中一个P输入信号的运行 通道偏离其他通道的P信号的运行。

公开(公告)号：US08872678B2

公开(公告)日：2014-10-28

申请号：US13552523

申请日：2012-07-18

申请人： Ragnar H. Jonsson ,  Vilhjalmur S. Thorvaldsson ,  Trausti Thormundsson

发明人： Ragnar H. Jonsson ,  Vilhjalmur S. Thorvaldsson ,  Trausti Thormundsson

IPC分类号： H03H17/00 ,  H03H17/06 ,  H03H17/02 ,  H03M5/02

CPC分类号： H03M5/02 ,  H03H17/0275 ,  H03H17/0642 ,  H03H17/0685

摘要： Poly-phase filters are used to offer an efficient and low complexity solution to rate conversion. However, they suffer from inflexibility and are not easily reconfigured. A novel design for rate converters employ poly-phase filters but utilize interpolation between filter coefficients to add flexibility to rate conversion. This interpolation can be implemented as an interpolation of the poly-phase filter results. Additional approximations can be made to further reduce the amount of calculations required to implement a flexible rate converter.

摘要翻译： 多相滤波器用于提供高效且低复杂度的速率转换解决方案。 但是，它们不灵活，不容易重新配置。 用于速率转换器的新颖设计采用多相滤波器，但是利用滤波器​​系数之间的内插来增加速率转换的灵活性。 该插值可以实现为多相滤波器结果的内插。 可以进行额外的近似以进一步减少实现灵活的速率转换器所需的计算量。

公开(公告)号：US08768995B2

公开(公告)日：2014-07-01

申请号：US13119163

申请日：2010-08-13

申请人： Pierre-Andre Laporte

发明人： Pierre-Andre Laporte

IPC分类号： G06F17/17

CPC分类号： H03H17/0621 ,  H03H17/0223 ,  H03H17/0275 ,  H03H17/0685 ,  H03H2017/0247

摘要： The multi-branch rate change filter of the present invention achieves higher effective output rates by processing the input sample stream in two or more parallel filter branches with offset states.

摘要翻译： 本发明的多分支速率变化滤波器通过处理具有偏移状态的两个或更多个并行滤波器分支中的输入采样流来实现更高的有效输出速率。

公开(公告)号：US20130279562A1

公开(公告)日：2013-10-24

申请号：US13881581

申请日：2011-10-27

申请人： Stéphan Tassart

发明人： Stéphan Tassart

IPC分类号： H04L1/00

CPC分类号： H04L1/0002 ,  H03H17/0416 ,  H03H17/0455 ,  H03H17/0621 ,  H03H17/0685

摘要： There is described a method of making a linear periodically time varying system shift-invariant, comprising the following steps implemented for each input signal the sampling rate of which has to be converted: —generating a set of polyphase components based on the input signal, —feeding the generated set of polyphase components to the system, and —generating an output signal by performing interleaving, shifting and addition on signals output by the system corresponding to the generated set of polyphase components processed by the system.

摘要翻译： 描述了一种制造线性周期性时变系统偏移不变量的方法，包括为每个输入信号实现以下步骤，其中采样速率必须被转换： - 基于输入信号产生一组多相分量， 将生成的多相分量组合馈送到系统，并且通过对由系统处理的生成的多相分量组合对应的系统输出的信号执行交织，移位和相加来产生输出信号。

公开(公告)号：US20130212341A1

公开(公告)日：2013-08-15

申请号：US13766128

申请日：2013-02-13

申请人： MICROSOFT CORPORATION

发明人： John A. Tardif ,  Brian Lloyd Schmidt ,  Sunil Kumar Vemula ,  Robert N. Heitkamp

IPC分类号： G06F12/00

CPC分类号： G10L19/125 ,  G06F3/0604 ,  G06F3/0656 ,  G06F3/0659 ,  G06F3/0673 ,  G06F12/00 ,  G06F12/02 ,  G06F13/28 ,  G06F2213/28 ,  G10L19/24 ,  G10L99/00 ,  G11B20/10037 ,  G11B20/10046 ,  G11B20/10527 ,  G11B2020/10694 ,  G11B2020/10787 ,  G11B2220/2516 ,  H03H17/0685

摘要： The subject disclosure is directed towards a technology that may be used in an audio processing environment. Nodes of an audio flow graph are associated with virtual mix buffers. As the flow graph is processed, commands and virtual mix buffer data are provided to audio fixed-function processing blocks. Each virtual mix buffer is mapped to a physical mix buffer, and the associated command is executed with respect to the physical mix buffer. One physical mix buffer mix buffer may be used as an input data buffer for the audio fixed-function processing block, and another physical mix buffer as an output data buffer, for example.

摘要翻译： 本发明涉及可以在音频处理环境中使用的技术。 音频流图的节点与虚拟混合缓冲器相关联。 当流程图被处理时，命令和虚拟混合缓冲器数据被提供给音频固定功能处理块。 每个虚拟混合缓冲器被映射到物理混合缓冲器，并且相关命令相对于物理混合缓冲器被执行。 例如，一个物理混合缓冲器混合缓冲器可以用作音频固定功能处理块的输入数据缓冲器，另一个物理混合缓冲器用作输出数据缓冲器。

公开(公告)号：US08477056B2

公开(公告)日：2013-07-02

申请号：US12791694

申请日：2010-06-01

申请人： Han Henry Sun ,  Kuang-Tsan Wu ,  Yuejian Wu ,  Sandy Thomson ,  John D. McNicol ,  David J. Krause

发明人： Han Henry Sun ,  Kuang-Tsan Wu ,  Yuejian Wu ,  Sandy Thomson ,  John D. McNicol ,  David J. Krause

IPC分类号： H03M1/12

CPC分类号： H03H17/0621 ,  H03H17/0685 ,  H03H2017/0298

摘要： A system, method, and apparatus is disclosed for interpolation of an output of an analog to digital converter (ADC) to enable operation of the ADC at a sampling rate that is independent of the sampling rate for a DSP core so as to efficiently enable operation at higher date rates. According to one of the embodiments, an interpolation circuit is coupled between the ADC and DSP core and receives a first plurality of samples of data at the first data rate from the ADC and supplies a plurality of samples of second data at a second data rate to the DSP core; the second data rate being less than the first data rate. According to one of the embodiments, the interpolation circuit includes a memory and a FIR filter circuit having filter tap coefficient values selected to provide attenuation at high frequencies to reduce aliasing noise.

摘要翻译： 公开了一种用于对模数转换器（ADC）的输出进行插值的系统，方法和装置，以使得能够以独立于DSP核的采样率的采样速率对ADC进行操作，以便有效地使能操作 以较高的日期率。 根据实施例之一，内插电路耦合在ADC和DSP内核之间，并从ADC接收第一数据速率的第一多个数据采样，并将第二数据的多个样本以第二数据速率提供给 DSP内核; 第二数据速率小于第一数据速率。 根据实施例中的一个，内插电路包括存储器和具有滤波器抽头系数值的FIR滤波器电路，该滤波器抽头系数值被选择以在高频率下提供衰减以减少混叠噪声。

公开(公告)号：US20130038475A1

公开(公告)日：2013-02-14

申请号：US13552523

申请日：2012-07-18

申请人： Ragnar H. Jonsson ,  Vilhjalmur S. Thorvaldsson ,  Trausti Thormundsson

发明人： Ragnar H. Jonsson ,  Vilhjalmur S. Thorvaldsson ,  Trausti Thormundsson

IPC分类号： H03M7/00

CPC分类号： H03M5/02 ,  H03H17/0275 ,  H03H17/0642 ,  H03H17/0685

摘要： Poly-phase filters are used to offer an efficient and low complexity solution to rate conversion. However, they suffer from inflexibility and are not easily reconfigured. A novel design for rate converters employ poly-phase filters but utilize interpolation between filter coefficients to add flexibility to rate conversion. This interpolation can be implemented as an interpolation of the poly-phase filter results. Additional approximations can be made to further reduce the amount of calculations required to implement a flexible rate converter.

摘要翻译： 多相滤波器用于提供高效且低复杂度的速率转换解决方案。 但是，它们不灵活，不容易重新配置。 用于速率转换器的新颖设计采用多相滤波器，但是利用滤波器​​系数之间的内插来增加速率转换的灵活性。 该插值可以实现为多相滤波器结果的内插。 可以进行额外的近似以进一步减少实现灵活的速率转换器所需的计算量。