专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明申请

US20180254053A1 FILTER COEFFICIENT UPDATING IN TIME DOMAIN FILTERING 审中-公开
公开(公告)号：US20180254053A1
公开(公告)日：2018-09-06
申请号：US15753070
申请日：2016-09-15
申请人： DOLBY LABORATORIES LICENSING CORPORATION
发明人： Dong SHI , Xuejing SUN
IPC分类号： G10L25/18 , H03H21/00 , H03H17/02
CPC分类号： G10L25/18 , G10L25/48 , H03H17/0227 , H03H17/0294 , H03H21/0025 , H03H21/0043
摘要： Example embodiments disclosed herein relate to filter coefficient updating in time domain filtering. A method of processing an audio signal is disclosed. The method includes obtaining a predetermined number of target gains for a first portion of the audio signal by analyzing the first portion of the audio signal. Each of the target gains is corresponding to a linear subband of the audio signal. The method also includes determining a filter coefficients for time domain filtering the first portion of the audio signal so as to approximate a frequency response given by the target gains. The filter coefficients are determined by iteratively selecting at least one target gain from the target gains and updating the filter coefficient based on the selected at least one target gain. Corresponding system and computer program product for processing an audio signal are also disclosed.

2. 发明申请

US20100262427A1 LOW COMPLEXITY SPECTRAL BAND REPLICATION (SBR) FILTERBANKS 有权
标题翻译：低复杂频谱带复制（SBR）滤波器
公开(公告)号：US20100262427A1
公开(公告)日：2010-10-14
申请号：US12759248
申请日：2010-04-13
申请人： Ravi Kiran Chivukula , Yuriy Reznik
发明人： Ravi Kiran Chivukula , Yuriy Reznik
IPC分类号： G06F17/00
CPC分类号： H03H17/0227 , G10L19/0204 , G10L19/0212 , G10L19/022 , G10L21/02 , G10L25/18 , H03H17/0213 , H03H17/0266 , H03H17/0272 , H03H2218/04
摘要： A complex analysis filterbank is implemented by obtaining an input audio signal as a plurality of N time-domain input samples. Pair-wise additions and subtractions of the time-domain input samples is performed to obtain a first and second groups of intermediate samples, each group having N/2 intermediate samples. The signs of odd-indexed intermediate samples in the second group are then inverted. A first transform is applied to the first group of intermediate samples to obtain a first group of output coefficients in the frequency domain. A second transform is applied to the second group of intermediate samples to obtain an intermediate second group of output coefficients in the frequency domain. The order of coefficients in the intermediate second group of output coefficients is then reversed to obtain a second group of output coefficients. The first and second groups of output coefficients may be stored and/or transmitted as a frequency domain representation of the audio signal.
摘要翻译：通过获得作为多个N个时域输入样本的输入音频信号来实现复分析滤波器组。执行时域输入样本的成对加法和减法以获得第一组和第二组中间样本，每组具有N / 2个中间样本。然后将第二组中奇数中值样本的符号反转。对第一组中间样本应用第一变换，以获得频域中的第一组输出系数。对第二组中间样本应用第二变换，以获得频域中的输出系数的中间第二组。输出系数的中间第二组中的系数顺序被反转以获得第二组输出系数。第一和第二组输出系数可以作为音频信号的频域表示被存储和/或发送。

3. 发明申请

US20020138531A1 Systems and methods for a partial sum digital fir filter 有权
标题翻译：部分和数字数字冷杉滤波器的系统和方法
公开(公告)号：US20020138531A1
公开(公告)日：2002-09-26
申请号：US09777622
申请日：2001-02-05
申请人： Conexant Systems, Inc.
发明人： Benjamin E. Felts III , Wilson Wang
IPC分类号： G06F017/10
CPC分类号： H03H17/06 , H03H17/0227
摘要： A digital FIR filter is provided that inputs a series of data samples xnull0null . . . xnullnnull and generates a partial sum output PSnullinull, where inulln. The partial sum output is a weighted version of the a difference between a partial sum of the previous inull1 data samples, PSnullinull1null, and the current data sample xnullnnull added to the current data sample xnullnnull. The filter includes a plurality of weighting stages. Each weighting stage includes a first adder for subtracting the current data sample xnullnnull from the previous partial sum PSnullinull1null, a multiplier that multiplies the difference by a weighting coefficient, and a second adder that sums the weighted difference with the current data sample. The filter also includes a plurality of delay elements, each of which inputs a partial sum and imposes a unit delay on the partial sum before supplying it to a weighting stage.
摘要翻译：提供了一个数字FIR滤波器，输入一系列数据样本x [0]。。。 x [n]并产生部分和输出PS [i]，其中i <= n。部分和输出是先前i-1个数据采样的部分和之间的差的加权版本，PS [i-1]和添加到当前数据样本x [n ]。滤波器包括多个加权级。每个加权级包括第一加法器，用于从先前的部分和PS [i-1]中减去当前数据样本x [n]，乘法器将该差乘以加权系数，第二加法器将加权差与当前数据样本。滤波器还包括多个延迟元件，每个延迟元件输入部分和，并且在将其提供给加权级之前对该部分和施加单位延迟。

4. 发明授权

US5881103A Electronic device with equalized audio accessory and method for same 失效
标题翻译：具有均衡音频附件的电子设备及其方法
公开(公告)号：US5881103A
公开(公告)日：1999-03-09
申请号：US510986
申请日：1995-08-03
申请人： Chin Pan Wong , Scott D. Gleason
发明人： Chin Pan Wong , Scott D. Gleason
IPC分类号： H03G5/16 , H03H17/02 , H03H7/40 , H03G3/00
CPC分类号： H03H17/0227 , H03G5/16
摘要： An electronic device (110) provides equalization and/or compensation for a coupled audio accessory device (120). The audio accessory device (120) has a memory (220) that contains equalizer parameters (304, 308, 310, 314) which helps in characterizing its audio response or impact on audio signals within the electronic device (110). When the audio accessory device (120) is coupled to the electronic device (110), the electronic device (110) reads the equalizer parameters (304, 308, 310, 314) from the audio accessory's memory (220) and processes audio signals with equalization and/or compensation based at least in part on the equalizer parameters (304, 308, 310, 314).
摘要翻译：电子设备（110）为耦合的音频附件设备（120）提供均衡和/或补偿。音频附件设备（120）具有存储器（220），该存储器（220）包含有助于表征其音频响应或对电子设备（110）内的音频信号的影响的均衡器参数（304,308,310,314）。当音频附件设备（120）耦合到电子设备（110）时，电子设备（110）从音频附件的存储器（220）读取均衡器参数（304,308,310,314）并且处理音频信号，均衡和/或补偿至少部分地基于均衡器参数（304,308,310,314）。

5. 发明授权

US4121296A Digital signal processing arrangement 失效
标题翻译：数字信号处理装置
公开(公告)号：US4121296A
公开(公告)日：1978-10-17
申请号：US808095
申请日：1977-06-20
申请人： Wilfred Andre Maria Snijders , Nicolaas Alphonsus Maria Verhoeckx , Petrus Josephus Van Gerwen , Hendrik Arie Van Essen
发明人： Wilfred Andre Maria Snijders , Nicolaas Alphonsus Maria Verhoeckx , Petrus Josephus Van Gerwen , Hendrik Arie Van Essen
IPC分类号： H03H15/00 , G06F17/15 , H03H17/00 , H03H17/02 , H03H19/00 , H04L27/04 , G06F15/34
CPC分类号： G06F17/15 , H03H17/0227 , H03H17/0233 , H04L27/04
摘要： Digital signal processing arrangement such as a digital filter for computing output signal samples which are each equal to the sum of products of a given plurality of pairs (for example N) of input signal samples. One of the input signal samples of the pair is, for example, formed each time by a sample x(n) of a digital signal to be filtered, the other input signal sample of the pair by a filter coefficient z(n), wherein either the sample x(n) or the filter coefficient z(n) can assume only a limited number of values 0, .+-.A.sub.1, .+-.A.sub.2, . . . .+-.A.sub.M, M being much smaller than N. In the case x(n) can assume only this limited number of values, z(n) is first multiplied, owing to the x(n) belonging to the pair, by the sign of x(n) for generating a product of the form z(n). sgn [x(n)]. In-dependent of the magnitude of n(n) this product is applied to an accumulator which corresponds with this magnitude of x(n). N products have been applied to one of the M accumulators the partial sums stored therein are multiplied by the magnitude .vertline.x(n).vertline. corresponding therewith and the products obtained are added together.
摘要翻译：数字信号处理装置，例如用于计算输出信号样本的数字滤波器，每个输出信号样本各自等于给定多对（例如N个）输入信号样本的乘积之和。例如，该对的输入信号采样之一每次由要滤波的数字信号的采样x（n）形成，该对的另一个输入信号采样通过滤波器系数z（n），其中样本x（n）或滤波器系数z（n）可以仅采用有限数量的值0，+/- A1，+/- A2，。。 +/- AM，M远小于N.在x（n）可以仅假设这个有限数量的值的情况下，由于属于该对的x（n），z（n）首先乘以 x（n）的符号，用于生成形式为z（n）的乘积。 sgn [x（n）]。依赖于n（n）的大小，该乘积被施加到对应于x（n）的这个大小的累加器。已经将N个产品应用于M个累加器中的一个，其中存储的部分和乘以与其对应的幅度| x（n）|，并将获得的乘积相加。

6. 发明授权

US4092618A Discrete transversal filter 失效
标题翻译：离散过滤器
公开(公告)号：US4092618A
公开(公告)日：1978-05-30
申请号：US748698
申请日：1976-12-08
申请人： Loic Bernard Yves Guidoux
发明人： Loic Bernard Yves Guidoux
IPC分类号： H03H15/00 , H03H17/02 , H03H17/06 , H04B3/04 , H03H7/10 , H03H5/00
CPC分类号： H03H17/0227 , H03H17/0294
摘要： Digital transversal filter for realizing a lowpass filter with a cut-off frequency f.sub.g and an impulse response h.sub.1 (i), a lowpass filter having a cut-off frequency 2f.sub.g which has a transfer characteristic which is in phase with the first-mentioned lowpass filter, as well as a lowpass filter with a quadrature transfer characteristic of the in-phase filter.

7. 发明申请

US20190245521A1 DIGITAL FILTERING METHOD, CORRESPONDING CIRCUIT AND DEVICE 审中-公开
公开(公告)号：US20190245521A1
公开(公告)日：2019-08-08
申请号：US16240915
申请日：2019-01-07
申请人： STMicroelectronics S.r.l.
发明人： Giuseppe Maiocchi , Ezio Galbiati , Michele Boscolo Berto
IPC分类号： H03H17/02 , G06F7/523
CPC分类号： H03H17/0227 , G06F7/523 , H03H17/0225 , H03H17/0248 , H03H17/04 , H03H2017/022
摘要： A method includes receiving an input digital signal and applying the input digital signal to digital filter processing with a corner frequency to produce a filtered output digital signal. The digital filter processing includes a set of multiplication operations using a set of filter multiplication coefficients. The set of multiplication operations is performed by alternately using a first set of approximate multiplication coefficients and a second set of approximate multiplication coefficients different from the first set of approximate multiplication coefficients. The approximate multiplication coefficients in the first set of approximate multiplication coefficients and the second set of approximate multiplication coefficients approximate multiplication coefficients in the set of filter multiplication coefficients as a function of negative power-of-two values. The alternating of multiplication operations results in digital filter processing with average corner frequency approximating the corner frequency.

8. 发明申请

US20180152173A1 APPARATUS FOR MODIFYING A SAMPLING RATE, SYSTEM INCLUDING AN APPARATUS FOR MODIFYING A SAMPLING RATE AND METHOD FOR MODIFYING A SAMPLING RATE 有权
公开(公告)号：US20180152173A1
公开(公告)日：2018-05-31
申请号：US15884097
申请日：2018-01-30
申请人： Innovationszentrum fur Telekommunikationstechnik GmbH IZT
发明人： Rainer PERTHOLD
IPC分类号： H03H17/02
CPC分类号： H03H17/0227 , H03H17/0213 , H03H17/0233 , H03H2017/0214
摘要： An apparatus for modifying a sampling rate includes a forward transformer for forming a first version of a spectrogram by means of transformation with a first transformation length from an information signal with a first sampling rate. The apparatus includes a processor for forming a second version of the spectrogram with a lower bandwidth than the first version. The apparatus includes a reverse transformer for forming a coarsely pre-modified information signal with a second sampling rate that is reduced with respect to the first sampling rate, by means of reverse transformation of the second version of the spectrogram with a second transformation length that is reduced with respect to the first transformation length. The apparatus includes a time domain interpolator for acquiring an information signal with a third sampling rate that is modified with respect to the second sampling rate, by means of interpolation of the pre-modified information signal.

9. 发明授权

US09306728B2 Signal generating device 有权
标题翻译：信号发生装置
公开(公告)号：US09306728B2
公开(公告)日：2016-04-05
申请号：US14418254
申请日：2013-07-31
申请人： Mitsubishi Electric Corporation
发明人： Hiroki Iura , Koji Tomitsuka
IPC分类号： H04L7/00 , H03H17/02 , H03H17/06 , H04L7/08
CPC分类号： H04L7/0025 , H03H17/0227 , H03H17/0286 , H03H17/0294 , H03H17/0621 , H03H2017/0222 , H04L7/08
摘要： A signal generating device includes a first digital filter unit outputting a first interpolated signal by interpolating an input signal, a second digital filter unit outputting a second interpolated signal by interpolating the first interpolated signal, a phase calculation unit calculating a phase of a digital signal, a phase-accuracy conversion unit calculating first phase signal and second phase signal, a first memory storing filter coefficients, a first coefficient readout unit reading filter coefficients from the first memory and switching filter coefficients of the first digital filter unit, a phase-error calculation unit calculating a phase error signal, a second memory storing filter coefficients, a second coefficient readout unit reading filter coefficients from the second memory, and a gain normalization unit normalizing a gain of the filter coefficients to maintain a constant sum of the filter coefficients and switching filter coefficients of the second digital filter unit.
摘要翻译：信号发生装置包括通过内插输入信号输出第一内插信号的第一数字滤波器单元，通过内插第一内插信号输出第二内插信号的第二数字滤波器单元，计算数字信号的相位的相位计算单元，计算第一相位信号和第二相位信号的相位精度转换单元，存储滤波器系数的第一存储器，从第一存储器读取滤波器系数的第一系数读出单元和第一数字滤波器单元的切换滤波器系数，相位误差计算计算相位误差信号的单元，存储滤波器系数的第二存储器，从第二存储器读取滤波器系数的第二系数读出单元和对滤波器系数的增益进行归一化的增益归一化单元，以维持滤波器系数和切换的恒定和第二数字滤波器单元的滤波器系数。

10. 发明申请

US20110138205A1 OPTIMIZING PROCESSOR OPERATION IN A PROCESSING SYSTEM INCLUDING ONE OR MORE DIGITAL FILTERS 有权
标题翻译：处理系统中的优化处理器操作，包括一个或多个数字滤波器
公开(公告)号：US20110138205A1
公开(公告)日：2011-06-09
申请号：US13003349
申请日：2008-07-30
申请人： Craig B McAnally , Paul J. Hays
发明人： Craig B McAnally , Paul J. Hays
IPC分类号： G06F1/32 , G06F17/10
CPC分类号： H03H17/0227 , G01F1/8436 , H03H2017/0245 , H03H2017/0298 , H03H2220/08
摘要： A method for optimizing processor operation in a processing system including one or more digital filters is provided according to the invention. The method includes generating initial filter coefficients for the one or more digital filters of the processing system, determining one or more initial filter coefficients for at least one digital filter of the one or more digital filters that can be dropped and dropping the one or more initial filter coefficients. Dropping the one or more initial filter coefficients reduces a total number of filter coefficients to be used by the processing system.
摘要翻译：根据本发明提供了一种用于优化包括一个或多个数字滤波器的处理系统中的处理器操作的方法。该方法包括为处理系统的一个或多个数字滤波器生成初始滤波器系数，确定一个或多个数字滤波器的至少一个数字滤波器的一个或多个初始滤波器系数，该数字滤波器可以被丢弃并丢弃一个或多个初始滤波系数。丢弃一个或多个初始滤波器系数减少了由处理系统使用的滤波器系数的总数。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式