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1. 发明申请

US20170264271A1 Complex Exponential Modulated Filter Bank for High Frequency Reconstruction or Parametric Stereo 有权
公开(公告)号：US20170264271A1
公开(公告)日：2017-09-14
申请号：US15608020
申请日：2017-05-30
申请人： Dolby International AB
发明人： Per Ekstrand
IPC分类号： H03H17/02
CPC分类号： H04R3/04 , G06F17/10 , G06F17/11 , G10L19/008 , G10L19/0204 , G10L19/0208 , G10L19/26 , G10L19/265 , G10L21/00 , H03H17/0201 , H03H17/0248 , H03H17/0266 , H03H17/0275 , H03H17/0294 , H03H2017/0297 , H04S7/307
摘要： An apparatus and method are disclosed for filtering an audio signal. The apparatus includes an analysis filter bank, a phase shifter, a high frequency reconstructor or parametric stereo processor, and a synthesis filter bank. The analysis filterbank receives real-valued time domain input audio samples and generates complex valued subband samples. The phase shifter shifts a phase of the complex-valued subband samples by an amount. The high frequency reconstructor or parametric stereo processor modifies at least some of the complex valued subband samples. A phase shifter then unshifts a phase of the modified complex-valued subband samples by the amount. The synthesis filter bank receives the modified complex valued subband samples and generates time domain output audio samples.

2. 发明授权

US09743183B1 Complex exponential modulated filter bank for high frequency reconstruction or parametric stereo 有权
公开(公告)号：US09743183B1
公开(公告)日：2017-08-22
申请号：US15586480
申请日：2017-05-04
申请人： Dolby International AB
发明人： Per Ekstrand
IPC分类号： H04R3/04 , H03H17/02 , G10L19/26 , H04S7/00
CPC分类号： H04R3/04 , G06F17/10 , G06F17/11 , G10L19/008 , G10L19/0204 , G10L19/0208 , G10L19/26 , G10L19/265 , G10L21/00 , H03H17/0201 , H03H17/0248 , H03H17/0266 , H03H17/0275 , H03H17/0294 , H03H2017/0297 , H04S7/307
摘要： An apparatus and method are disclosed for filtering an audio signal are disclosed. The apparatus includes an analysis filter bank, a high frequency reconstructor or a parametric stereo processor, and a synthesis filter bank. The analysis filterbank receives real-valued time domain input audio samples and generates complex valued subband samples. The high frequency reconstructor or parametric stereo processor modifies at least some of the complex valued subband samples. The synthesis filter bank receives the modified complex valued subband samples and generates time domain output audio samples. The analysis filter bank comprises analysis filters that are complex exponential modulated versions of a prototype filter.

3. 发明授权

US09716486B1 Complex exponential modulated filter bank for high frequency reconstruction or parametric stereo 有权
公开(公告)号：US09716486B1
公开(公告)日：2017-07-25
申请号：US15466266
申请日：2017-03-22
申请人： Dolby International AB
发明人： Per Ekstrand
IPC分类号： G06F7/00 , H03H17/02 , G06F17/11 , G10L19/26 , G10L19/02 , G10L19/008
CPC分类号： H04R3/04 , G06F17/10 , G06F17/11 , G10L19/008 , G10L19/0204 , G10L19/0208 , G10L19/26 , G10L19/265 , G10L21/00 , H03H17/0201 , H03H17/0248 , H03H17/0266 , H03H17/0275 , H03H17/0294 , H03H2017/0297 , H04S7/307
摘要： An apparatus and method are disclosed for filtering and performing high frequency reconstruction of an audio signal. The apparatus includes an analysis filter bank, a phase shifter, a high frequency reconstructor, and a synthesis filter bank. The analysis filterbank receives real-valued time domain input audio samples and generates complex valued subband samples. The phase shifter shifts a phase of the complex-valued subband samples by an arbitrary amount. The high frequency reconstructor modifies at least some of the complex valued subband samples. A phase shifter unshifts a phase of the modified complex-valued subband samples by the arbitrary amount. The synthesis filter bank receives the modified complex valued subband samples and generates time domain output audio samples. The analysis filter bank comprises analysis filters that are complex exponential modulated versions of a prototype filter with an arbitrary phase shift.

4. 发明申请

US20170169835A1 Complex Exponential Modulated Filter Bank for High Frequency Reconstruction 有权
公开(公告)号：US20170169835A1
公开(公告)日：2017-06-15
申请号：US15441652
申请日：2017-02-24
申请人： Dolby International AB
发明人： Per Ekstrand
IPC分类号： G10L19/26 , G10L19/02
CPC分类号： H04R3/04 , G06F17/10 , G06F17/11 , G10L19/008 , G10L19/0204 , G10L19/0208 , G10L19/26 , G10L19/265 , G10L21/00 , H03H17/0201 , H03H17/0248 , H03H17/0266 , H03H17/0275 , H03H17/0294 , H03H2017/0297 , H04S7/307
摘要： An apparatus and method are disclosed for filtering and performing high frequency reconstruction of an audio signal. The apparatus includes an analysis filter bank, a high frequency reconstructor, and a synthesis filter bank. The analysis filterbank receives real-valued time domain input audio samples and generates complex valued subband samples. The high frequency reconstructor modifies at least some of the complex valued subband samples. The synthesis filter bank receives the modified complex valued subband samples and generates time domain output audio samples. The analysis filter bank comprises analysis filters that are complex exponential modulated versions of a prototype filter with an arbitrary phase shift.

5. 发明授权

US09583118B1 Complex exponential modulated filter bank for high frequency reconstruction 有权
标题翻译：用于高频重建的复指数调制滤波器组
公开(公告)号：US09583118B1
公开(公告)日：2017-02-28
申请号：US15353860
申请日：2016-11-17
申请人： Dolby International AB
发明人： Per Ekstrand
IPC分类号： G10L19/26 , G10L19/02 , H03H17/02
CPC分类号： H04R3/04 , G06F17/10 , G06F17/11 , G10L19/008 , G10L19/0204 , G10L19/0208 , G10L19/26 , G10L19/265 , G10L21/00 , H03H17/0201 , H03H17/0248 , H03H17/0266 , H03H17/0275 , H03H17/0294 , H03H2017/0297 , H04S7/307
摘要： An apparatus and method are disclosed for filtering and performing high frequency reconstruction of an audio signal. The apparatus includes an analysis filter bank, a high frequency reconstructor, and a synthesis filter bank. The analysis filterbank receives real-valued time domain input audio samples and generates complex valued subband samples. The high frequency reconstructor modifies at least some of the complex valued subband samples. The synthesis filter bank receives the modified complex valued subband samples and generates time domain output audio samples. The analysis filter bank comprises analysis filters that are complex exponential modulated versions of a prototype filter with an arbitrary phase shift.
摘要翻译：公开了用于滤波和执行音频信号的高频重建的装置和方法。该装置包括分析滤波器组，高频重建器和合成滤波器组。分析滤波器组接收实时的时域输入音频样本并生成复值子带样本。高频重建器修改至少一些复值子带样本。合成滤波器组接收经修改的复值子带样本并生成时域输出音频样本。分析滤波器组包括分析滤波器，其是具有任意相移的原型滤波器的复指数调制版本。

6. 发明申请

US20160329062A1 Low Delay Modulated Filter Bank 有权
标题翻译：低延迟调制滤波器组
公开(公告)号：US20160329062A1
公开(公告)日：2016-11-10
申请号：US15214694
申请日：2016-07-20
申请人： Dolby International AB
发明人： Per Ekstrand , Nicholas Luke Appleton
IPC分类号： G10L19/26 , G10L19/02
CPC分类号： H04R3/04 , G06F17/10 , G06F17/11 , G10L19/008 , G10L19/0204 , G10L19/0208 , G10L19/26 , G10L19/265 , G10L21/00 , H03H17/0201 , H03H17/0248 , H03H17/0266 , H03H17/0275 , H03H17/0294 , H03H2017/0297 , H04S7/307
摘要： The document relates to modulated digital filter banks, as well as to methods and systems for the design of such filter banks. In particular, the document discloses a method comprising accessing a time-domain audio signal and applying a first filter bank to the time-domain audio signal, thereby producing a first plurality of subbands of frequency-domain audio data representative of at least a part of the audio signal. The filter bank comprises an decimated modulated filter bank obtained from an asymmetric prototype filter. The method further comprises applying a second filter bank to at least a first subband of the first plurality of subbands of frequency-domain audio data, thereby producing a second plurality of subbands of frequency-domain audio data representative of at least a part of the audio signal. The second modulated filter bank comprises an asymmetric modulated filter bank which includes no decimation. The method further comprises outputting at least the second plurality of subbands of frequency domain audio data.
摘要翻译：该文件涉及调制数字滤波器组，以及用于设计这种滤波器组的方法和系统。特别地，本文件公开了一种方法，包括访问时域音频信号并将第一滤波器组应用于时域音频信号，从而产生频域音频数据的第一多个子带，其代表至少部分音频信号。滤波器组包括从不对称原型滤波器获得的抽取调制滤波器组。该方法还包括将第二滤波器组应用于频域音频数据的第一多个子带中的至少第一子带，从而产生表示音频的至少一部分的频域音频数据的第二多个子带信号。第二调制滤波器组包括不包括抽取的不对称调制滤波器组。该方法还包括至少输出频域音频数据的第二多个子带。

7. 发明申请

US20150333733A1 Low Delay Modulated Filter Bank 有权
公开(公告)号：US20150333733A1
公开(公告)日：2015-11-19
申请号：US14807554
申请日：2015-07-23
申请人： Dolby International AB
发明人： Per Ekstrand
IPC分类号： H03H17/02
CPC分类号： H04R3/04 , G06F17/10 , G06F17/11 , G10L19/008 , G10L19/0204 , G10L19/0208 , G10L19/26 , G10L19/265 , G10L21/00 , H03H17/0201 , H03H17/0248 , H03H17/0266 , H03H17/0275 , H03H17/0294 , H03H2017/0297 , H04S7/307
摘要： The document relates to modulated sub-sampled digital filter banks, as well as to methods and systems for the design of such filter banks. In particular, the present document proposes a method and apparatus for the improvement of low delay modulated digital filter banks. The method employs modulation of an asymmetric low-pass prototype filter and a new method for optimizing the coefficients of this filter. Further, a specific design for a 64 channel filter bank using a prototype filter length of 640 coefficients and a system delay of 319 samples is given. The method substantially reduces artifacts due to aliasing emerging from independent modifications of subband signals, for example when using a filter bank as a spectral equalizer. The method is preferably implemented in software, running on a standard PC or a digital signal processor (DSP), but can also be hardcoded on a custom chip. The method offers improvements for various types of digital equalizers, adaptive filters, multiband companders and spectral envelope adjusting filter banks used in high frequency reconstruction (HFR) or parametric stereo systems.

8. 发明授权

US08782109B2 Asynchronous sample rate conversion using a polynomial interpolator with minimax stopband attenuation 有权
标题翻译：使用具有最小极限阻带衰减的多项式插值器进行异步采样率转换
公开(公告)号：US08782109B2
公开(公告)日：2014-07-15
申请号：US13228679
申请日：2011-09-09
申请人： Ryo Tsutsui
发明人： Ryo Tsutsui
IPC分类号： G06F17/10 , H03H17/02 , H03H17/06
CPC分类号： H03H17/0628 , H03H17/0275 , H03H17/028
摘要： Methods for sample rate conversion are provided that use a polynomial interpolator with minimax stopband attenuation. A method for sample rate conversion of an input signal is provided that uses a time-varying polyphase filter having a discrete polyphase index m. Another method for sample rate conversion of an input signal is provided that uses a time-varying polyphase filter having a continuous polyphase index τ. In these methods, an output time index is mapped to an input sample index and the polyphase index, the polynomial coefficients of a polyphase filter are computed using the polyphase index, and the polyphase filter is applied to an input sample at the input sample index to generate the output sample at the output time index.
摘要翻译：提供了采用速率转换的方法，其使用具有最小极限阻带衰减的多项式内插器。提供了一种使用具有离散多相指数m的时变多相滤波器的输入信号的采样率转换方法。提供了输入信号的采样率转换的另一种方法，其使用具有连续多相指数τ的时变多相滤波器。在这些方法中，将输出时间索引映射到输入样本索引和多相索引，使用多相索引计算多相滤波器的多项式系数，并将多相滤波器应用于输入样本索引处的输入样本在输出时间索引下生成输出样本。

9. 发明授权

US08725785B1 Parallel infinite impulse response filter 有权
标题翻译：平行无限脉冲响应滤波器
公开(公告)号：US08725785B1
公开(公告)日：2014-05-13
申请号：US12117555
申请日：2008-05-08
申请人： Osama S. Haddadin , Brad T. Hansen , Ryan Hinton
发明人： Osama S. Haddadin , Brad T. Hansen , Ryan Hinton
IPC分类号： G06F17/10
CPC分类号： H03H17/04 , H03H17/0275 , H03H17/0277 , H03H2218/06
摘要： A technique for performing parallel-input parallel-output infinite impulse response (IIR) filtering uses two parallel-input-parallel-output finite impulse response (FIR) filters. One FIR filter is used as a feed-forward filter and one FIR filter is used as a feed-back filter. The feed-back filter is coupled to delays and summers to allow the filter operations to be performed in parallel.
摘要翻译：一种执行并行输入并行输出无限脉冲响应（IIR）滤波的技术使用两个并行输入并行输出有限脉冲响应（FIR）滤波器。一个FIR滤波器用作前馈滤波器，一个FIR滤波器用作反馈滤波器。反馈滤波器耦合到延迟和加法器以允许并行执行滤波器操作。

10. 发明授权

US08650236B1 High-rate interpolation or decimation filter in integrated circuit device 有权
标题翻译：集成电路设备中的高速内插或抽取滤波器
公开(公告)号：US08650236B1
公开(公告)日：2014-02-11
申请号：US12535133
申请日：2009-08-04
申请人： Shin-I Chou
发明人： Shin-I Chou
IPC分类号： G06F17/17 , G06F17/10
CPC分类号： H03H17/0621 , H03H17/0275 , H03H2017/0247 , H03H2017/0298
摘要： On a device having a maximum data rate, an interpolation filter can be configured in stages, with each stage may be broken into subfilters, which divides the output into phases. The ratio of the number of subfilters or phases in the final stage to the number of subfilters or phases in the initial stage is equal to the factor by which the data rate would otherwise increase. Thus for an interpolation factor of M, the output data rate can be kept the same as the input data rate by providing M subfilters, yielding M output phases each having an output rate equal to the input rate. The effective, or synthesized, output rate is M times the input rate. A decimation filter can be provided in the same way, with the effective input rate M times the output rate, even where the effective input rate would exceed the maximum data rate.
摘要翻译：在具有最大数据速率的设备上，可以分阶段地配置内插滤波器，其中每个级可以被分成子滤波器，其将输出分为相。最后阶段的子过滤器或相位的数量与初始阶段中的子过滤器或相位的数量之比等于数据速率否则会增加的因素。因此，对于M的内插因子，通过提供M个子滤波器，输出数据速率可以保持与输入数据速率相同，产生每个具有等于输入速率的输出速率的M个输出相位。有效或合成的输出速率是输入速率的M倍。即使在有效输入速率超过最大数据速率的情况下，可以以相同的方式提供抽取滤波器，有效输入速率为输出速率的M倍。

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