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    • 2. 发明申请
    • SUPPRESSING NOISE IN AN AUDIO SIGNAL
    • 在音频信号中抑制噪声
    • WO2011041738A3
    • 2011-07-14
    • PCT/US2010051209
    • 2010-10-01
    • QUALCOMM INCRAMAKRISHNAN DINESHSHAHRI HOMAYOUNWANG SONG
    • RAMAKRISHNAN DINESHSHAHRI HOMAYOUNWANG SONG
    • G10L21/02G11B20/24
    • G10L21/0208G10L21/0232
    • An electronic device for suppressing noise in an audio signal is described. The electronic device includes a processor and instructions stored in memory. The electronic device receives an input audio signal and computes an overall noise estimate based on a stationary noise estimate, a non-stationary noise estimate and an excess noise estimate. The electronic device also computes an adaptive factor based on an input Signal-to-Noise Ratio (SNR) and one or more SNR limits. A set of gains is also computed using a spectral expansion gain function. The spectral expansion gain function is based on the overall noise estimate and the adaptive factor. The electronic device also applies the set of gains to the input audio signal to produce a noise-suppressed audio signal and provides the noise-suppressed audio signal.
    • 描述了用于抑制音频信号中的噪声的电子设备。 电子设备包括处理器和存储在存储器中的指令。 电子设备接收输入音频信号,并且基于静态噪声估计,非平稳噪声估计和过量噪声估计来计算总体噪声估计。 电子设备还基于输入信噪比(SNR)和一个或多个SNR限制来计算自适应因子。 还使用频谱扩展增益函数来计算一组增益。 频谱扩展增益函数基于总噪声估计和自适应因子。 电子设备还将该组增益应用于输入音频信号以产生噪声抑制的音频信号并提供噪声抑制音频信号。
    • 3. 发明申请
    • INTEGER REPRESENATION OF RELATIVE TIMING BETWEEN DESIRED OUTPUT SAMPLES AND CORRESPONDING INPUT SAMPLES
    • 所有输出样本和相关输入样本之间相对时间的整体表示
    • WO2007146599A2
    • 2007-12-21
    • PCT/US2007070038
    • 2007-05-31
    • QUALCOMM INCWANG SONGCHOY EDDIE L TGUPTA SAMIR KUMAR
    • WANG SONGCHOY EDDIE L TGUPTA SAMIR KUMAR
    • H03H17/06
    • H03H17/0685
    • In general, this disclosure describes techniques for changing a sampling frequency of a digital signal. In particular, the techniques provide a more accurate way to determining a relative timing between a desired output sample and a corresponding input sample using a non-approximated integer representation of the relative timing. The relative timing between the desired output sample and corresponding input sample may be represented using a first component that identifies a latest input sample of the digital signal used to generate intermediate samples, a second component that identifies an intermediate sample, and a third component that identifies a timing difference between the desired output sample and the intermediate sample. Each of the components may be recursively updated using non-approximated integer values.
    • 通常,本公开描述了用于改变数字信号的采样频率的技术。 特别地,这些技术提供了使用相对定时的非近似整数表示来确定期望输出采样和相应输入采样之间的相对定时的更精确的方法。 可以使用标识用于生成中间样本的数字信号的最新输入样本的第一组件,标识中间样本的第二组件和标识中间样本的第三组件来表示期望输出样本与相应输入样本之间的相对时序 所需输出样本和中间样本之间的时间差。 可以使用非近似的整数值递归地更新每个组件。
    • 5. 发明申请
    • DIGITAL DOMAIN SAMPLING RATE CONVERTER
    • 数字采样速率转换器
    • WO2007095624A3
    • 2007-10-11
    • PCT/US2007062250
    • 2007-02-15
    • QUALCOMM INCWANG SONGCHOY EDDIE L TKULKAMI PRAJAKT VGUPTA SAMIR KUMAR
    • WANG SONGCHOY EDDIE L TKULKAMI PRAJAKT VGUPTA SAMIR KUMAR
    • H03H17/06
    • H03H17/0685H03H17/0294
    • Techniques are described for sampling rate conversion in the digital domain by up-sampling and down-sampling a digital signal according to a selected intermediate sampling frequency. A prototype anti-aliasing filter that has a bandwidth with multiple factors is stored in memory. The techniques include selecting an intermediate sampling frequency to be an integer multiple of a desired output sampling frequency of a digital signal based on the factors of the prototype filter, and selecting a down-sampling factor to be the same integer associated with the selected intermediate sampling frequency. A filter generator generates an anti-aliasing filter for the selected down-sampling factor based on the prototype filter. A sampling rate converter up-samples the digital signal at an input sampling frequency to the selected intermediate sampling frequency, filters the digital signal with the derived anti-aliasing filter, and down-samples the digital signal by the selected down-sampling factor to the desired output sampling frequency.
    • 描述了通过根据所选择的中间采样频率对数字信号进行上采样和下采样来对数字域中的采样率转换进行描述的技术。 具有多个因素的带宽的原型抗混叠滤波器存储在存储器中。 这些技术包括基于原型滤波器的因素来选择中间采样频率为数字信号的期望输出采样频率的整数倍,并且将下采样因子选择为与所选择的中间采样相关联的整数 频率。 滤波器发生器基于原型滤波器生成用于所选择的下采样因子的抗混叠滤波器。 采样率转换器将数字信号以输入采样频率向采样频率进行上采样,以采样导出的抗混叠滤波器对数字信号进行滤波,并通过选择的下采样因子将数字信号下采样到 所需输出采样频率。