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1. 发明专利

AU3460301A A multiplierless interpolator for a delta-sigma digital to analog converter 未知
公开(公告)号：AU3460301A
公开(公告)日：2001-08-07
申请号：AU3460301
申请日：2001-01-26
申请人： SONIC INNOVATIONS INC
发明人： WILSON GERALD , GREEN ROBERT S
IPC分类号： H03H17/02 , H03H17/04 , H03H17/06 , H03M3/00
摘要： A simplified algorithm for digital signal interpolation and a novel architecture to implement the algorithm in an integrated circuit ("IC") with significant space constraints are presented. According to embodiments of the present invention, the interpolator is divided into two parts. The first part of the interpolator increases the sample rate by a factor of two and smoothes the signal using a half-band Infinite Impulse Response ("IIR") filter. The second part of the interpolator increases the sample rate of the signal by a factor of thirty-two using a zero-order-hold ("ZOH") circuit. In one embodiment, the half-band IIR filter is implemented using an all-pass lattice structure to minimize quantization effects. The lattice coefficients are chosen such that the structure can achieve all filter design requirements, yet is capable of being implemented with a small number of shifters and adders, and no multipliers.

2. 发明申请

WO0156167A3 A MULTIPLIERLESS INTERPOLATOR FOR A DELTA-SIGMA DIGITAL TO ANALOG CONVERTER 审中-公开
标题翻译：用于三角形数字转换器的多功能插补器
公开(公告)号：WO0156167A3
公开(公告)日：2002-03-14
申请号：PCT/US0102744
申请日：2001-01-26
申请人： SONIC INNOVATIONS INC
发明人： WILSON GERALD , GREEN ROBERT S
IPC分类号： H03H17/02 , H03H17/04 , H03H17/06
CPC分类号： H03H17/0225 , H03H17/0279 , H03H17/0285 , H03H17/0416 , H03H17/0444
摘要： A simplified algorithm for digital signal interpolation and a novel architecture to implement the algorithm in an integrated circuit ("IC") with significant space constraints are presented. According to the embodiments of the present invention, the interpolator is divided into two parts. The first part of the interpolator increases the sample rate by a factor of two and smoothes the signal using a half-band Infinite Impulse Response ("IIR") filter. The second part of the interpolator increases the sample rate of the signal by a factor of thirty-two using a zero-order-hold ("ZOH") circuit. In one embodiment, the half-band IIR filter is implemented using an all-pass lattice structure to minimize quantization effects. The lattice coefficients are chosen such that the structure can achieve all filter design requirements, yet is capable of being implemented with a small number of shifters and adders, and no multipliers.
摘要翻译：提出了一种用于数字信号插值的简化算法和一种在具有显着空间约束的集成电路（“IC”）中实现该算法的新型架构。根据本发明的实施例，内插器被分成两部分。插值器的第一部分将采样率提高一倍，并使用半带无限脉冲响应（“IIR”）滤波器对信号进行平滑。内插器的第二部分使用零级保持（“ZOH”）电路将信号的采样率增加了三十二倍。在一个实施例中，使用全通格格结构来实现半带IIR滤波器以使量化效应最小化。选择晶格系数使得该结构可以实现所有滤波器设计要求，但是能够用少量的移位器和加法器实现，并且不需要乘法器。

3. 发明申请

WO0122775A3 SUBBAND ACOUSTIC FEEDBACK CANCELLATION IN HEARING AIDS 审中-公开
标题翻译：听觉爱滋病中的SUBBAND ACOUSTIC FEEDBACK CANCELLATION
公开(公告)号：WO0122775A3
公开(公告)日：2001-12-06
申请号：PCT/US0024230
申请日：2000-08-31
申请人： SONIC INNOVATIONS INC
发明人： FANG XIAOLING , WILSON GERALD , GILES BRAD
IPC分类号： G10L19/00 , G10L19/02 , G10L19/14 , G10L21/02 , H04R25/00 , H04R3/02
CPC分类号： H04R25/453 , H04R25/505 , H04R2430/03
摘要： A new subband feedback cancellation scheme is proposed, capable of providing additional stable gain without introducing audible artifacts. The subband feedback cancellation scheme employs a cascade of two narrow-band filters Ai(Z) and Bi(Z) ng with a fixed delay, instead of a single filter Wi(Z) and a delay to represent the feedback path in each subband. The first filter, Ai(Z) , is called the training filter, and models the static portion of the feedback path in i subband, including microphone, receiver, ear canal resonance, and other relatively static parameters. The training filter can be implemented as a FIR filter or as an IIR filter. The second filter, BI(Z) , is called a tracking filter and is typically implemented as a FIR filter with fewer taps than the training filter. This second filter tracks the variations of the feedback path in the i subband caused by jaw movement or objects close to the ears of the user.
摘要翻译：提出了一种新的子带反馈消除方案，能够提供额外的稳定增益而不引入可听见的伪像。子带反馈消除方案采用具有固定延迟的两个窄带滤波器Ai（Z）和Bi（Z）ng级联，而不是单个滤波器 Wi（Z），并且表示每个子带中的反馈路径的延迟。第一个滤波器Ai（Z）被称为训练滤波器，并对第i i个子频带中的反馈路径的静态部分进行建模，包括麦克风，接收机，耳道共振等相对静态的参数。训练滤波器可以实现为FIR滤波器或IIR滤波器。第二个滤波器BI（Z）被称为跟踪滤波器，并且通常被实现为具有比训练滤波器更少的抽头的FIR滤波器。该第二滤波器跟踪由钳口移动或靠近用户耳朵的物体引起的第i i个子带中的反馈路径的变化。

4. 发明专利

DE60004539T2 未知
公开(公告)号：DE60004539T2
公开(公告)日：2004-09-02
申请号：DE60004539
申请日：2000-08-31
申请人： SONIC INNOVATIONS INC
发明人： FANG XIAOLING , WILSON GERALD , GILES BRAD
IPC分类号： G10L19/00 , G10L19/02 , G10L19/14 , G10L21/02 , H04R25/00 , H04R3/02

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