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1. 发明申请

WO2014153604A1 AUDIO FILTERS UTILIZING SINE FUNCTIONS 审中-公开
标题翻译：音频滤波器利用正弦函数
公开(公告)号：WO2014153604A1
公开(公告)日：2014-10-02
申请号：PCT/AU2014/000317
申请日：2014-03-26
申请人： BARRATT, Lachlan, Paul
发明人： BARRATT, Lachlan, Paul
IPC分类号： H04R1/20 , H03H17/00 , G01R23/167 , G06F17/17
CPC分类号： H04R3/04 , G06F3/165 , G06T5/00 , G06T2207/20024 , G06T2207/20172 , G10L21/0332 , H03H17/0248 , H03H17/0266 , H03H17/0286 , H03H17/0657 , H04R1/22
摘要： A method of digitally filtering an audio signal using an adjusted audio filter. The adjusted audio filter is represented by an impulse response including a waveform in its time domain represented by a sine function of absolute values. A composite audio filter is derived from two adjusted audio filters although any number of filters may be used. The composite audio filter generally includes a bank of the filters which together define a frequency bandwidth representative of the audio signal or spectrum to be filtered. Also a bandpass filter is constructed by combining frequency responses for sine components of absolute values integrated from 0 to bpf and sine components of absolute values integrated from 1 /bpf to 0. The frequency response may be the sum of the frequency responses for each of the filters used to create the composite bandpass filter.
摘要翻译：使用经调整的音频滤波器对音频信号进行数字滤波的方法。经调整的音频滤波器由包括由其绝对值的正弦函数表示的时域中的波形的脉冲响应表示。复合音频滤波器来自两个调整的音频滤波器，尽管可以使用任何数量的滤波器。复合音频滤波器通常包括一组滤波器，它们一起限定表示要滤波的音频信号或频谱的频率带宽。另外，通过将从0到bpf的积分的绝对值的正弦分量的频率响应与从1 / bpf到0的积分的绝对值的正弦分量相结合，构成带通滤波器。频率响应可以是每个频率响应的和用于创建复合带通滤波器的滤波器。

2. 发明申请

WO2014153607A1 AUDIO FILTERING WITH ADJUSTED AVERAGING CURVES 审中-公开
标题翻译：音频滤波与调整的平均曲线
公开(公告)号：WO2014153607A1
公开(公告)日：2014-10-02
申请号：PCT/AU2014/000321
申请日：2014-03-26
申请人： BARRATT, Lachlan, Paul
发明人： BARRATT, Lachlan, Paul
IPC分类号： H04N19/117 , H03K5/159 , G06F19/00 , G06F17/15 , G06F17/14 , G06F17/16
CPC分类号： H04R3/04 , G06F3/165 , G06T5/00 , G06T2207/20024 , G06T2207/20172 , G10L21/0332 , H03H17/0248 , H03H17/0266 , H03H17/0286 , H03H17/0657 , H04R1/22
摘要： The present invention relates broadly to a method of digitally filtering an audio signal by applying a composite audio filter. The composite audio filter is obtained by combining a plurality of sample filters to one another where each of the sample filters is provided at respective of a plurality of predetermined frequencies. The method involves applying an averaging curve to each of the sample filters where the width of the averaging curve is adjusted proportional to the frequency of the respective sample filter. This provides an average sample filter for each of the plurality of sample filters and the average sample filters are combined to provide the composite audio filter.
摘要翻译：本发明广泛地涉及通过应用复合音频滤波器对音频信号进行数字滤波的方法。复合音频滤波器是通过将多个样本滤波器彼此组合而获得的，其中每个采样滤波器分别以多个预定频率提供。该方法包括对每个样本滤波器应用平均曲线，其中平均曲线的宽度被调整成与各个样本滤波器的频率成比例。这提供了用于多个样本滤波器中的每一个的平均采样滤波器，并且将平均采样滤波器组合以提供复合音频滤波器。

3. 发明申请

WO2014153609A1 AUDIO FILTERING WITH VIRTUAL SAMPLE RATE INCREASES 审中-公开
标题翻译：音频过滤与虚拟样本速率增加
公开(公告)号：WO2014153609A1
公开(公告)日：2014-10-02
申请号：PCT/AU2014/000325
申请日：2014-03-26
申请人： BARRATT, Lachlan, Paul
发明人： BARRATT, Lachlan, Paul
IPC分类号： H03H17/00 , G06F17/10
CPC分类号： H04R3/04 , G06F3/165 , G06T5/00 , G06T2207/20024 , G06T2207/20172 , G10L21/0332 , H03H17/0248 , H03H17/0266 , H03H17/0286 , H03H17/0657 , H04R1/22
摘要： The present invention relates broadly to a method of digitally filtering an audio signal by applying a composite audio filter. The composite audio filter may be obtained by applying one audio filter to another audio filter each having the same predetermined sample rate including neighbouring sample points. The other audio filter may also include one or more intervening sample points between adjacent of its neighbouring sample points. The one audio filter may be applied to the other audio filter at an adjusted sampling rate relative to the other audio filter. The adjusted sampling rate may be inversely proportional to the number of intervening sample points relative to the number of neighbouring sample points for the other filter. The frequency response curve for the composite filter derived using the adjusted sampling rate may be more indicative of an idealised lowpass filter. The frequency response with the adjusted sampling rate may display a more bell-shaped characteristic compared with the frequency response without an adjusted sampling rate (shown in broken line detail).
摘要翻译：本发明广泛地涉及通过应用复合音频滤波器对音频信号进行数字滤波的方法。可以通过将一个音频滤波器应用到具有包括相邻采样点的相同预定采样率的另一个音频滤波器来获得复合音频滤波器。另一个音频滤波器还可以包括在其相邻采样点的相邻之间的一个或多个中间采样点。一个音频滤波器可以相对于另一个音频滤波器以调整的采样速率被施加到另一个音频滤波器。调整的采样率可能与相对于另一个滤波器的相邻采样点的数量的中间采样点的数量成反比。使用经调整的采样率导出的复合滤波器的频率响应曲线可以更多地表示理想的低通滤波器。具有调整的采样率的频率响应可以显示比没有调整的采样率的频率响应更多的钟形特征（以虚线细节示出）。

4. 发明申请

WO2015149115A1 MODIFIED DIGITAL FILTERING WITH SAMPLE ZONING 审中-公开
标题翻译：改进的数字滤波与样品分区
公开(公告)号：WO2015149115A1
公开(公告)日：2015-10-08
申请号：PCT/AU2015/000197
申请日：2015-04-01
申请人： BARRATT, Lachlan, Paul
发明人： BARRATT, Lachlan, Paul
IPC分类号： H03H17/00 , H03H17/06 , H03H17/02
CPC分类号： H03H17/0201 , H03H17/02 , H03H17/0213 , H03H17/0294 , H03H2017/0072 , H03H2218/14 , H04R3/04
摘要： The present invention relates broadly to a method of digitally filtering a signal, such as an audio signal, using a digital filter. The digital filter includes a plurality of neighbouring sample points broken into zones having different frequency content or frequency ranges. The zones adjacent one another may have neighbouring sample points in common. Generally each zone has at least same distinct frequencies compared with other zones. That is, the zones are roughly dependent on the frequency content. The invention in its preferred form involves combining values for two or more of the neighbouring sample points for select of the zones depending on its frequency content. The values are combined so as to provide a modified zone having substantially the same number of sample points as the select zone. The modified zones together provide a modified filter to be applied to the signal.
摘要翻译：本发明广泛地涉及使用数字滤波器对诸如音频信号的信号进行数字滤波的方法。数字滤波器包括被分成具有不同频率内容或频率范围的区域的多个相邻采样点。彼此相邻的区域可以具有相同的相邻采样点。通常，每个区域与其他区域相比具有至少相同的不同频率。也就是说，这些区域大致取决于频率内容。本发明在其优选形式中涉及组合两个或更多个相邻采样点的值，以根据其频率内容来选择区域。这些值被组合以提供具有与选择区域基本相同数量的采样点的修改区域。修改后的区域一起提供要应用于信号的修改过滤器。

5. 发明申请

WO2014153606A1 AUDIO FILTERING WITH VIRTUAL SAMPLE RATE INCREASES 审中-公开
标题翻译：音频过滤与虚拟样本速率增加
公开(公告)号：WO2014153606A1
公开(公告)日：2014-10-02
申请号：PCT/AU2014/000319
申请日：2014-03-26
申请人： BARRATT, Lachlan, Paul
发明人： BARRATT, Lachlan, Paul
IPC分类号： H04R1/20 , H03H17/00 , G06F17/17 , G01R23/167
CPC分类号： H04R3/04 , G06F3/165 , G06T5/00 , G06T2207/20024 , G06T2207/20172 , G10L21/0332 , H03H17/0248 , H03H17/0266 , H03H17/0286 , H03H17/0657 , H04R1/22
摘要： The present invention relates broadly to a method of digitally filtering an audio signal at a predetermined sample rate by applying a composite audio filter derived at an increase sample rate. The composite audio filter is obtained by combining one audio filter with another audio filter at the increased sample rate. The sample rate of the audio filters may be increased from their predetermined to the increased sample rate using various weighting techniques. The composite filter may provide a frequency response curve with a corner frequency as it approaches the Nyquist frequency whereas the frequency response of a conventional filter (shown in broken line detail) is flat with no effect.
摘要翻译：本发明广泛地涉及通过应用以增加采样率导出的复合音频滤波器以预定采样率数字滤波音频信号的方法。通过以增加的采样率将一个音频滤波器与另一音频滤波器组合来获得复合音频滤波器。音频滤波器的采样率可以使用各种加权技术从其预定的增加到采样率的增加。复合滤波器可以在接近奈奎斯特频率时提供具有拐角频率的频率响应曲线，而常规滤波器的频率响应（以虚线细节示出）是平坦的，没有影响。

6. 发明申请

WO2014153605A1 AUDIO SAMPLE RATE INCREASES 审中-公开
标题翻译：音频采样率增加
公开(公告)号：WO2014153605A1
公开(公告)日：2014-10-02
申请号：PCT/AU2014/000318
申请日：2014-03-26
申请人： BARRATT, Lachlan, Paul
发明人： BARRATT, Lachlan, Paul
IPC分类号： H03M7/00 , G06F19/00 , H04N19/00 , H03K5/00 , G06F17/00
CPC分类号： H04R3/04 , G06F3/165 , G06T5/00 , G06T2207/20024 , G06T2207/20172 , G10L21/0332 , H03H17/0248 , H03H17/0266 , H03H17/0286 , H03H17/0657 , H04R1/22
摘要： The present invention relates broadly to a method of digitally processing an audio signal. The sample rate of the audio signal may be increased from a predetermined sample rate to an increase sample rate using various techniques. For ease of understanding an audio signal may be represented by an impulse response produced by an impulse fed to a filter. Values of the impulse response are weighted using the various techniques of the preferred embodiments. With weighting the frequency response may be more indicative of an idealised smooth lowpass filter. The frequency response with weighting has a constant rate of change whereas the frequency response without weighting (shown in broken line detail) has a kink uncharacteristic of a smooth lowpass filter.
摘要翻译：本发明广泛涉及数字处理音频信号的方法。使用各种技术，音频信号的采样率可以从预定采样率增加到采样率增加。为了便于理解，音频信号可以由由馈送到滤波器的脉冲产生的脉冲响应来表示。使用优选实施例的各种技术对脉冲响应的值进行加权。通过加权，频率响应可以更多地指示理想化的平滑低通滤波器。具有加权的频率响应具有恒定的变化率，而没有加权的频率响应（以虚线细节示出）具有平滑低通滤波器的扭结非特性。

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