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公开(公告)号：US08865991B1
公开(公告)日：2014-10-21
申请号：US12316670
申请日：2008-12-15
IPC分类号： G10H1/36
CPC分类号： G10H1/42 , G10H2210/325 , G10H2210/385 , G10H2220/371
摘要： A portable music player for the playback of a digital audio file comprises a memory for storing a plurality of digital audio files; an audio output; a control for setting a desired change in pitch or tempo; and a digital signal processor configured to process a digital audio file and recover an audio signal therefrom, perceptibly alter one of the pitch and the tempo of the audio signal in response to the desired change in pitch or tempo without perceptibly altering the other of the pitch and tempo, and output the altered audio signal to the audio output.
摘要翻译： 用于播放数字音频文件的便携式音乐播放器包括用于存储多个数字音频文件的存储器; 音频输出; 用于设定所需音调或速度变化的控制; 以及数字信号处理器，被配置为处理数字音频文件并从其中恢复音频信号，可以响应于所需的音调或节奏变化而明显地改变音频信号的音调和速度之一，而无需明显地改变音调的另一个 和速度，并将改变的音频信号输出到音频输出。
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公开(公告)号：US08489393B2
公开(公告)日：2013-07-16
申请号：US12623896
申请日：2009-11-23
IPC分类号： G10L19/00
CPC分类号： G10L21/0272 , G10L21/0364
摘要： The perceived quality of a narrowband speech signal truncated from a wideband speech signal is improved by generating in a third frequency band third speech components matching first speech components in a first frequency band of the narrowband signal, and generating in a fourth frequency band fourth speech components matching second speech components in a second frequency band of the narrowband signal. A first gain factor is applied to the third speech components to generate adjusted third speech components, and a second gain factor is applied to the fourth speech components to generate adjusted fourth speech components, the gain factors being selected such that the ratios of the average powers of the adjusted third and fourth speech components to the average power of the first speech components are predetermined values.
摘要翻译： 通过在第三频带中产生与窄带信号的第一频带中的第一语音分量相匹配的第三语音分量并在第四频带中生成第四语音分量来改善从宽带语音信号中截取的窄带语音信号的感知质量 在窄带信号的第二频带中匹配第二语音分量。 将第一增益因子应用于第三语音分量以产生经调整的第三语音分量，并且将第二增益因子应用于第四语音分量以产生经调整的第四语音分量，所述增益因子被选择为使得平均功率 被调整的第三和第四语音分量相对于第一语音分量的平均功率是预定值。
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3.发明授权Method and apparatus for improving intelligibility of audible speech represented by a speech signal 有权用于提高由语音信号表示的可听话音的可懂度的方法和装置公开(公告)号：US08321215B2
公开(公告)日：2012-11-27
申请号：US12623883
申请日：2009-11-23
IPC分类号： G10L11/04
CPC分类号： G10L21/0364
摘要： The perceived quality of a speech signal is improved by estimating the average power of first and second signal components and applying a first gain factor to the second signal components to generate adjusted second signal components. The first gain factor is selected such that on application of the first gain factor to the second signal components, the ratio of the average power of the first signal components to the average power of the adjusted second signal components would be a first predetermined value, the first predetermined value being such as to inhibit perceptual distortion of the improved speech signal.
摘要翻译： 通过估计第一和第二信号分量的平均功率并将第一增益因子应用于第二信号分量来产生调整后的第二信号分量来提高语音信号的感知质量。 选择第一增益因子，使得在将第一增益因子应用于第二信号分量时，第一信号分量的平均功率与调整的第二信号分量的平均功率的比值将是第一预定值， 第一预定值是为了抑制改进的语音信号的感知失真。
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公开(公告)号：US20110125494A1
公开(公告)日：2011-05-26
申请号：US12623933
申请日：2009-11-23
IPC分类号： G10L21/02
CPC分类号： G10L21/038 , G10L21/02 , G10L21/0208 , G10L25/78
摘要： The perceived quality of a speech signal output from a user apparatus is improved by storing ambient noise profiles each indicating a model power distribution of a respective ambient noise type as a function of frequency; the ambient noise profile at the user apparatus is measured, the measured ambient noise profile is correlated with each of the stored ambient noise profiles, the stored ambient noise profile is selected with which the measured ambient noise profile is most highly correlated, and the speech signal is manipulated in dependence on which of the stored ambient noise profiles is selected, so as to form an improved speech signal.
摘要翻译： 通过存储各自指示作为频率的函数的相应环境噪声类型的模型功率分布的环境噪声分布来改善从用户装置输出的语音信号的感知质量; 测量用户装置处的环境噪声分布，测量的环境噪声分布与每个存储的环境噪声分布相关联，选择存储的环境噪声分布，测量的环境噪声分布与其最高度相关，并且语音信号 根据所选择的存储的环境噪声分布中的哪一个被操纵，以便形成改进的语音信号。
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公开(公告)号：US20090225997A1
公开(公告)日：2009-09-10
申请号：US12103728
申请日：2008-04-16
IPC分类号： H04B3/20
CPC分类号： H04M9/082 , H04M1/6066 , H04M2250/02 , H04W52/0245 , H04W52/0254 , Y02D70/144
摘要： An audio processing device for reducing the effect on a first signal of echo from a second signal, the device comprising: an echo reduction processor for processing the first signal to reduce echo in it, the echo reduction unit having: a first mode of operation for reducing echo of a first function from the first signal; and a second mode of operation for reducing echo of a second function from the first signal, the second function being more complex than the first function and the echo reduction processor being such as to consume more power in the second mode of operation than in the first mode of operation; and an echo reduction controller for controlling the echo reduction processor to operate in a selected one of the first mode of operation and the second mode of operation.
摘要翻译： 一种音频处理装置，用于减少对来自第二信号的第一回波信号的影响，该装置包括：回波减少处理器，用于处理第一信号以减少其中的回波，回波减少单元具有：第一操作模式， 从第一信号减少第一功能的回波; 以及用于从所述第一信号减少第二功能的回波的第二操作模式，所述第二功能比所述第一功能更复杂，并且回波减少处理器在第二操作模式中比在第一功能中消耗更多的功率 操作模式; 以及回波降低控制器，用于控制回波减少处理器在所选择的第一操作模式和第二操作模式中操作。
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公开(公告)号：US09142221B2
公开(公告)日：2015-09-22
申请号：US12098570
申请日：2008-04-07
IPC分类号： G10L21/00 , G10L21/0216 , G10L21/0208 , G10L25/78 , G10L25/90
CPC分类号： G10L21/0208 , G10L25/78 , G10L25/90 , G10L2021/02163
摘要： A signal processor for estimating noise power in an audio signal includes a filter unit for generating a series of power values, each power value representing the power in the audio signal at a respective one of a plurality of frequency bands; a signal classification unit for analysing successive portions of the audio signal to assess whether each portion contains features characteristic of speech, and for classifying each portion in dependence on that analysis; a correction unit for estimating a minimum power value in a time-limited part of the audio signal, estimating the total noise power in that part of the audio signal and forming a correction factor dependent on the ratio of the minimum power value to the estimated total noise power, the correction unit being configured to estimate the minimum power value and the total noise power over only those portions of the time-limited part of the signal that are classified by the signal classification unit as being less characteristic of speech; and a noise estimation unit for estimating noise in the audio signal in dependence on the power values output by the filter unit and the correction factor formed by the correction unit.
摘要翻译： 用于估计音频信号中的噪声功率的信号处理器包括用于产生一系列功率值的滤波器单元，每个功率值表示在多个频带中的相应一个频带中的音频信号中的功率; 信号分类单元，用于分析音频信号的连续部分，以评估每个部分是否包含语音特征，并且根据该分析对每个部分进行分类; 校正单元，用于估计音频信号的时间有限的部分中的最小功率值，估计该部分音频信号中的总噪声功率，并形成依赖于最小功率值与估计总和的比率的校正因子 噪声功率，所述校正单元被配置为仅将所述信号分类单元分类的所述信号的所述时间有限部分的那些部分估计为较小的语音特性，估计所述最小功率值和所述总噪声功率; 以及噪声估计单元，用于根据由滤波器单元输出的功率值和由校正单元形成的校正因子来估计音频信号中的噪声。
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公开(公告)号：US20130259253A1
公开(公告)日：2013-10-03
申请号：US13434350
申请日：2012-03-29
IPC分类号： G10K11/16
CPC分类号： G10K11/178 , G10K2210/3035 , G10K2210/504 , H04R1/1083
摘要： A method for obtaining coefficients for a non-adaptive controller for use in an active noise control system, the method comprising capturing experimental data from a target system to characterise the plant of the target system; and implementing an adaptive algorithm to compute the coefficients in dependence on the experimental data.
摘要翻译： 一种用于获得用于主动噪声控制系统的非自适应控制器的系数的方法，所述方法包括从目标系统捕获实验数据以表征目标系统的设备; 并实现一个自适应算法，根据实验数据计算系数。
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公开(公告)号：US08280449B2
公开(公告)日：2012-10-02
申请号：US12238624
申请日：2008-09-26
CPC分类号： H04M1/6091 , H04M9/082
摘要： An audio handling device comprising: a source of audio data; a microphone; a loudspeaker; a transmitter for transmitting audio data; modification means for modifying the audio data; and a control unit for controlling the operation of the device, the control unit being capable of receiving signals from the microphone and configuring the conveying of audio data from the source to one or both of the loudspeaker and the transmitter; the control unit being capable of configuring the device such that during at least a probing period the modification means modifies audio data from the source and the modified audio data is transmitted by the transmitter, and being arranged to select in dependence on data dependent on signals received from the microphone whether to apply audio data from the source to the loudspeaker.
摘要翻译： 一种音频处理装置，包括：音频数据源; 麦克风 一个扬声器 用于发送音频数据的发射机; 用于修改音频数据的修改装置; 以及控制单元，用于控制设备的操作，所述控制单元能够接收来自所述麦克风的信号并且配置音频数据从所述扬声器和所述发射机中的一个或两者传送; 所述控制单元能够配置所述设备，使得在至少一个探测周期期间，所述修改装置修改来自所述源的音频数据，并且所述修改的音频数据由所述发射机发送，并且被布置为根据接收到的信号的数据进行选择 是否将来自源的音频数据应用于扬声器。
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公开(公告)号：US20120170766A1
公开(公告)日：2012-07-05
申请号：US12984941
申请日：2011-01-05
IPC分类号： G10K11/16
CPC分类号： G10K11/16 , G10K11/178 , G10K2210/1081 , G10K2210/3025 , G10K2210/3026 , G10K2210/3028 , H04R1/1083 , H04R3/005 , H04R2430/03 , H04R2460/01
摘要： An active noise cancellation controller for performing noise attenuation in a system over a predetermined frequency range, the active noise cancellation controller comprising: a first input for receiving a reference signal indicative of a noise level; a second input for receiving an error signal indicative of a remnant noise level; an output for providing a noise cancellation signal to a system in which noise attenuation is to be performed; a fixed feedback controller having a fixed infinite impulse response filter arranged for operation on an error signal received at the second input; a fixed feedforward controller having a fixed infinite impulse response filter arranged for operation on a reference signal received at the first input; and an adaptive feedforward controller having a digital adaptive finite impulse response filter arranged for operation on a reference signal received at the first input and on an error signal received at the second input, the coefficients of the digital adaptive filter being determined by: in the frequency domain, independently generating a set of initial coefficients for each of a plurality of subbands into which the predetermined frequency range is divided, said sets of initial coefficients being generated in accordance with a predetermined adaptive algorithm; and transforming said sets of initial coefficients into the time domain for use as the said coefficients of the digital adaptive filter; wherein the fixed feedback controller, fixed feedforward controller and adaptive feedforward controller are arranged to, in use, provide a noise cancellation signal at the output in dependence on a reference signal received at the first input and an error signal received at the second input.
摘要翻译： 一种用于在预定频率范围内在系统中执行噪声衰减的主动噪声消除控制器，所述主动噪声消除控制器包括：第一输入端，用于接收指示噪声电平的参考信号; 用于接收指示残余噪声电平的误差信号的第二输入; 用于向要执行噪声衰减的系统提供噪声消除信号的输出; 固定反馈控制器，具有固定的无限脉冲响应滤波器，用于对在第二输入端接收到的误差信号进行操作; 固定前馈控制器，具有固定的无限脉冲响应滤波器，用于对在第一输入处接收的参考信号进行操作; 以及具有数字自适应有限脉冲响应滤波器的自适应前馈控制器，所述数字自适应有限脉冲响应滤波器被布置用于对在第一输入处接收到的参考信号和在第二输入端接收的误差信号进行操作，数字自适应滤波器的系数由频率确定 域，分别为预定频率范围划分成的多个子带中的每一个独立地生成一组初始系数，所述初始系数组根据预定的自适应算法生成; 以及将所述初始系数组变换为所述时域以用作所述数字自适应滤波器的所述系数; 其中固定反馈控制器，固定前馈控制器和自适应前馈控制器被布置为在使用中根据在第一输入处接收的参考信号和在第二输入端接收到的误差信号在输出端提供噪声消除信号。
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公开(公告)号：US08718291B2
公开(公告)日：2014-05-06
申请号：US12984941
申请日：2011-01-05
IPC分类号： A61F11/06
CPC分类号： G10K11/16 , G10K11/178 , G10K2210/1081 , G10K2210/3025 , G10K2210/3026 , G10K2210/3028 , H04R1/1083 , H04R3/005 , H04R2430/03 , H04R2460/01
摘要： An active noise cancellation controller for performing noise attenuation in a system over a predetermined frequency rang. The controller comprises several components: a first input for a reference signal indicative of a noise level; a second input for receiving an error signal indicative of a remnant noise level; an output for providing a noise cancellation signal; a fixed feedback controller for processing the error signal; a fixed feed-forward controller for processing the reference signal; and an adaptive feed-forward controller having a digital adaptive finite impulse response filter arranged for operation on the reference signal the error signal.
摘要翻译： 用于在预定频率范围内在系统中执行噪声衰减的主动噪声消除控制器。 控制器包括几个部件：用于指示噪声电平的参考信号的第一输入; 用于接收指示残余噪声电平的误差信号的第二输入; 用于提供噪声消除信号的输出; 用于处理误差信号的固定反馈控制器; 用于处理参考信号的固定前馈控制器; 以及具有数字自适应有限脉冲响应滤波器的自适应前馈控制器，其布置用于对参考信号进行误差信号的操作。
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