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1. 发明申请

WO9847313A3 FILTERBANK STRUCTURE AND METHOD FOR FILTERING AND SEPARATING AN INFORMATION SIGNAL INTO DIFFERENT BANDS, PARTICULARLY FOR AUDIO SIGNALS IN HEARING AIDS 审中-公开
标题翻译：滤波器结构和方法将信息信号过滤和分离到不同的数据库中，特别是用于听觉艾滋病的音频信号
公开(公告)号：WO9847313A3
公开(公告)日：1999-02-11
申请号：PCT/CA9800329
申请日：1998-04-16
申请人： DSP FACTORY LTD , BRENNAN ROBERT , SCHNEIDER ANTHONY TODD
发明人： BRENNAN ROBERT , SCHNEIDER ANTHONY TODD
IPC分类号： H03H17/02 , H04R25/00
CPC分类号： H04R25/505 , H03H17/0266 , H03H17/0294 , H04R25/356 , H04R25/407 , H04R2225/43 , H04R2460/03
摘要： A filterbank structure is provided which provides a flexible compromise between the conflicting goals of processing delay, filter sharpness, memory usage and band interaction. The filterbank has an adjustable number of bands and a stacking which provides for a selectable shift of band frequencies to one of two discrete sets of center frequencies. The width of the bands and hence the number of the bands is selected depending upon acceptable delay, memory usage, and processing speed required. The flexibility in terms of stacking of the bands provides twice the number of potential band edge placements, which is advantageous for hearing loss fitting, especially at low frequencies. The same filter coefficients can be used for analysis and synthesis, to reduce memory usage.

2. 发明申请

WO03024152A3 LISTENING DEVICE 审中-公开
标题翻译： LISTENING设备
公开(公告)号：WO03024152A3
公开(公告)日：2003-08-14
申请号：PCT/CA0101509
申请日：2001-10-24
申请人： DSP FACTORY LTD , NIELSEN JAKOB , BRENNAN ROBERT , SCHNEIDER TODD
发明人： NIELSEN JAKOB , BRENNAN ROBERT , SCHNEIDER TODD
IPC分类号： H04R3/00 , H04R5/033 , H04R25/00 , H04R29/00
CPC分类号： H04R29/006 , H04R1/1083 , H04R3/005 , H04R25/30 , H04R25/407
摘要： A method for equalizing output signals from a plurality of signal paths is disclosed. The method comprises steps of identifying a transfer function for each of signal paths, determining a filtering function for each signal path such that a product of the transfer function, and the filtering function is a selected function and applying the filtering function to the corresponding signal path, thereby correcting the transfer function of the signal path to the selected function to equalize the output signals from the signal paths. The step of applying the filtering function comprises steps of providing an equalization filter to the signal path and applying the filtering function to the equalization filter of its corresponding signal path, thereby equalizing output signals from the filter of the signal paths.
摘要翻译：公开了一种用于均衡来自多个信号路径的输出信号的方法。该方法包括以下步骤：识别每个信号路径的传递函数，确定每个信号路径的滤波函数，使得传递函数和滤波函数的乘积为选定函数，并将滤波函数应用于相应的信号路径从而校正到所选功能的信号路径的传递函数以均衡来自信号路径的输出信号。应用滤波功能的步骤包括以下步骤：向信号路径提供均衡滤波器，并将滤波功能应用于其相应信号路径的均衡滤波器，从而均衡来自信号路径的滤波器的输出信号。

3. 发明专利

CA2406754C METHOD AND APPARATUS FOR NOISE REDUCTION, PARTICULARLY IN HEARING AIDS 未知
公开(公告)号：CA2406754C
公开(公告)日：2009-06-30
申请号：CA2406754
申请日：1998-04-16
申请人： DSP FACTORY LTD
发明人： BRENNAN ROBERT
IPC分类号： G10L21/0208 , H04R25/00 , G10L21/0232 , H03F1/00 , H03G7/06 , H04B15/00 , H04R3/04
摘要： A hearing aid includes noise reduction, and addresses the problem that, in noisy conditions, it is difficult for hearing impaired individuals to hear. Under light noise conditions, conventional hearing aids amplify the input signal sufficiency t o overcome the hearing loss. For a typical sloping hearing loss where there is a loss in high frequency hearing sensitivity, the amount of boost (or gain) rises with frequency. Most frequently, the loss in sensitivity is only for low-level signals; high level signals are affective minimally or not al all. A compression hearing aid is able to compensate by automatically lowering the gain as the input signal level rises. This compression action is usually comprised under noisy conditions. In general, hearing aids are of lesser benefit under noisy conditions since bot h noise and speech are boosted together when what is really required is a reduction of the noise relative to the speech. A noise reduction algorithm with the dual purpose of enhancing speech relative to noise and also providing a relatively clean signal for the compression circuitry is described.

4. 发明专利

AU764316C Apparatus for noise reduction, particulary in hearing aids 未知
公开(公告)号：AU764316C
公开(公告)日：2004-06-24
申请号：AU7826901
申请日：2001-10-08
申请人： DSP FACTORY LTD
发明人： BRENNAN ROBERT
IPC分类号： H03G7/06 , H04R25/00

5. 发明专利

DE69816610D1 未知
公开(公告)号：DE69816610D1
公开(公告)日：2003-08-28
申请号：DE69816610
申请日：1998-04-16
申请人： DSP FACTORY LTD
发明人： BRENNAN ROBERT
IPC分类号： H03G7/06 , H03G9/02 , H04R25/00
摘要： This invention describes a practical application of noise reduction in hearing aids. Although listening in noisy conditions is difficult for persons with normal hearing, hearing impaired individuals are at a considerable further disadvantage. Under light noise condition, conventional hearing aids simplify the input signal sufficiently to overcome the hearing loss. For a typical sloping hearing loss where there is a loss in high frequency hearing sensitivity, the amount of boost (or gain) rises with frequency. Most frequently, the loss in sensitivity is only for low-level signals; high level signals are affective minimally or not at all. A compression hearing aid is able to compensate by automatically lowering the gain as the input signal level rises. This compression action is usually compromised under noisy conditions. In general, hearing aids are of lesser benefit under noisy conditions since both noise and speech are boosted together when what is really required is a reduction of the noise relative to the speech. A noise reduction algorithm with the dual purpose of enhancing speech relative to noise and also providing a relatively clean signal for the compression circuitry is described.

6. 发明专利

NO314609B1 未知
公开(公告)号：NO314609B1
公开(公告)日：2003-04-14
申请号：NO995009
申请日：1999-10-14
申请人： DSP FACTORY LTD
发明人： BRENNAN ROBERT , SCHNEIDER ANTHONY TODD
IPC分类号： H03H17/02 , H04R25/00

7. 发明专利

AU740951B2 Method for Noise Reduction, Particularly in Hearing Aids 未知
公开(公告)号：AU740951B2
公开(公告)日：2001-11-15
申请号：AU6915598
申请日：1998-04-16
申请人： DSP FACTORY LTD
发明人： BRENNAN ROBERT
IPC分类号： H03G7/06 , H03G9/02 , H04R25/00
摘要： This invention describes a practical application of noise reduction in hearing aids. Although listening in noisy conditions is difficult for persons with normal hearing, hearing impaired individuals are at a considerable further disadvantage. Under light noise condition, conventional hearing aids simplify the input signal sufficiently to overcome the hearing loss. For a typical sloping hearing loss where there is a loss in high frequency hearing sensitivity, the amount of boost (or gain) rises with frequency. Most frequently, the loss in sensitivity is only for low-level signals; high level signals are affective minimally or not at all. A compression hearing aid is able to compensate by automatically lowering the gain as the input signal level rises. This compression action is usually compromised under noisy conditions. In general, hearing aids are of lesser benefit under noisy conditions since both noise and speech are boosted together when what is really required is a reduction of the noise relative to the speech. A noise reduction algorithm with the dual purpose of enhancing speech relative to noise and also providing a relatively clean signal for the compression circuitry is described.

8. 发明专利

CA2286051A1 FILTERBANK STRUCTURE AND METHOD FOR FILTERING AND SEPARATING AN INFORMATION SIGNAL INTO DIFFERENT BANDS, PARTICULARLY FOR AUDIO SIGNALS IN HEARING AIDS 未知
公开(公告)号：CA2286051A1
公开(公告)日：1998-10-22
申请号：CA2286051
申请日：1998-04-16
申请人： DSP FACTORY LTD
发明人： BRENNAN ROBERT , SCHNEIDER ANTHONY TODD
IPC分类号： H03H17/02 , H04R25/00
摘要： A filterbank structure is provided which provides a flexible compromise between the conflicting goals of processing delay, filter sharpness, memory usage and band interaction. The filterbank has an adjustable number of bands and a stacking which provides for a selectable shift of band frequencies to one of two discrete sets of center frequencies. The width of the bands and hence the number of the bands is selected depending upon acceptable delay, memory usage, and processing speed required. The flexibility in terms of stacking of the bands provides twice the number of potential band edge placements, which is advantageous for hearing loss fitting, especially at low frequencies. The same filter coefficients can be used for analysis and synthesis, to reduce memory usage.

9. 发明专利

CA2357200C LISTENING DEVICE 未知
公开(公告)号：CA2357200C
公开(公告)日：2010-05-04
申请号：CA2357200
申请日：2001-09-07
申请人： DSP FACTORY LTD
发明人： NIELSEN JAKOB , BRENNAN ROBERT , SCHNEIDER TODD
IPC分类号： H04B3/04 , G10K11/175 , H04R3/00 , H04R5/033 , H04R25/00 , H04R29/00
摘要： A method for equalizing output signals from a plurality of signal paths is disclosed. The method comprises steps of identifying a transfer function for each of signal paths, determining a filtering function for each signal path such that a product of the transfer function, and the filtering function is a selected function and applying the filtering function to the corresponding signal path, thereby correcting the transfer function of the signal path to the selected function to equalize the output signals from the signal paths. The step of applying the filtering function comprises steps of providing an equalization filter to the signal path and applying the filtering function to the equalization filter of its corresponding signal path, thereby equalizing output signals from the filter of the signal paths.

10. 发明专利

CA2424093A1 METHOD AND DEVICE FOR ACOUSTIC SHOCK PROTECTION 未知
公开(公告)号：CA2424093A1
公开(公告)日：2004-09-30
申请号：CA2424093
申请日：2003-03-31
申请人： DSP FACTORY LTD
发明人： SCHNEIDER TODD , BRENNAN ROBERT , HERMANN DAVID
IPC分类号： H03G7/00 , H04R5/04 , G10K11/16
摘要： An acoustic shock protection method and device are provided. A pattern analysis based approach is taken to an input signal to perform a feature extraction. A parameter space is identified, which is corresponding to the signal space of the input signal. A rule-based decision approach is taken to the parameter space to detect an acoustic event. The device may be advantageously implemented using a weighted overlap add approach to provide low group delay, high-fidelity and a high degree of protection from acoustic shock events.

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