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公开(公告)号：US20060293882A1
公开(公告)日：2006-12-28
申请号：US11167955
申请日：2005-06-28
IPC分类号： G10L19/02
CPC分类号： G10L21/02 , G10L15/065 , G10L15/20 , G10L21/0208
摘要： A method and system for enhancing the frequency response of speech signals are provided. An average speech spectral shape estimate is calculated over time based on the input speech signal. The average speech spectral shape estimate may be calculated in the frequency domain using a first order IIR filtering or “leaky integrators.” Thus, the average speech spectral shape estimate adapts over time to changes in the acoustic characteristics of the voice path or any changes in the electrical audio path that may affect the frequency response of the system. A spectral correction factor may be determined by comparing the average speech spectral shape estimate to a desired target spectral shape. The spectral correction factor may be added (in units of dB) to the spectrum of the input speech signal in order to enhance or adjust the spectrum of the input speech signal toward the desired spectral shape, and an enhanced speech signal re-synthesized from the corrected spectrum.
摘要翻译： 提供了一种用于增强语音信号的频率响应的方法和系统。 基于输入的语音信号，随时间计算平均语音频谱形状估计。 可以使用一阶IIR滤波或“泄漏积分器”在频域中计算平均语音频谱形状估计。 因此，平均语音频谱形状估计随时间适应语音路径的声学特性的变化或可能影响系统的频率响应的电音频路径中的任何变化。 可以通过将平均语音频谱形状估计与期望的目标光谱形状进行比较来确定频谱校正因子。 频谱校正因子可以以输入语音信号的频谱的形式添加（以dB为单位），以便增强或调整输入语音信号的频谱朝向期望的频谱形状，以及增强的语音信号从 校正光谱。
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公开(公告)号：US20060293016A1
公开(公告)日：2006-12-28
申请号：US11168654
申请日：2005-06-28
CPC分类号： G10L21/038
摘要： A system and methods are provided for extending the frequency bandwidth of a harmonic signal. Harmonic content of a band-limited signal is extended to frequencies outside the signal's passband by performing a non-linear transformation on the complex spectrum of the band-limited signal in the frequency domain. The non-linear transformation may be accomplishes by a linear convolution of the complex spectrum with itself. A system for extending the frequency bandwidth of a harmonic signal includes a signal processor with a forward transform module for transforming a time domain signal into the frequency domain, a non-linear transform module for performing the non-linear transformation on the complex spectrum of the harmonic signal, and a reverse transform module for transforming the extended spectrum of the harmonic signal back into the time domain.
摘要翻译： 提供了一种用于扩展谐波信号的频率带宽的系统和方法。 频带限制信号的谐波内容通过对频域中的带限信号的复频谱执行非线性变换而扩展到信号通带外的频率。 非线性变换可以通过复谱与其自身的线性卷积来实现。 用于扩展谐波信号的频率带宽的系统包括具有用于将时域信号变换为频域的正向变换模块的信号处理器，用于对时域信号进行非线性变换的非线性变换模块 谐波信号和用于将谐波信号的扩展频谱转换回时域的反向变换模块。
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公开(公告)号：US08249861B2
公开(公告)日：2012-08-21
申请号：US11645079
申请日：2006-12-22
申请人： Xueman Li , Phillip Hetherington , Alex Escott
发明人： Xueman Li , Phillip Hetherington , Alex Escott
CPC分类号： G10L21/02 , G10L21/0232 , G10L21/0264 , G10L21/0364
摘要： A speech enhancement system that improves the intelligibility and the perceived quality of processed speech includes a frequency transformer and a spectral compressor. The frequency transformer converts speech signals from the time domain to the frequency domain. The spectral compressor compresses a pre-selected portion of the high frequency band and maps the compressed high frequency band to a lower band limited frequency range. The speech enhancement system may be built into, may be a unitary part of, or may be configured to interface other systems that process audio or high frequency signals.
摘要翻译： 提高处理语音的可懂度和感知质量的语音增强系统包括频率变换器和频谱压缩器。 变频器将语音信号从时域转换为频域。 频谱压缩器压缩高频带的预选部分，并将压缩的高频带映射到较低频带限制的频率范围。 语音增强系统可以内置到处理音频或高频信号的其他系统中，可以是其整体部分，也可以被配置为接口。
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4.发明授权System for improving speech quality and intelligibility with bandwidth compression/expansion 有权用于提高语音质量和带宽压缩/扩展的清晰度的系统公开(公告)号：US07813931B2
公开(公告)日：2010-10-12
申请号：US11110556
申请日：2005-04-20
申请人： Phillip Hetherington , Xueman Li
发明人： Phillip Hetherington , Xueman Li
CPC分类号： G10L21/02 , G10L21/0264
摘要： A system and method are provided for improving the quality and intelligibility of speech signals. The system and method apply frequency compression to the higher frequency components of speech signals while leaving lower frequency components substantially unchanged. This preserves higher frequency information related to consonants which is typically lost to filtering and bandpass constraints. This information is preserved without significantly altering the fundamental pitch of the speech signal so that when the speech signal is reproduced its overall tone qualities are preserved. The system and method further apply frequency expansion to speech signals. Like the compression, only the upper frequencies of a received speech signal are expanded. When the frequency expansion is applied to a speech signal that has been compressed according to the invention, the speech signal is substantially returned to its pre-compressed state. However, frequency compression according to the invention provides improved intelligibility even when the speech signal is not subsequently re-expanded. Likewise, speech signals may be expanded even though the original signal was not compressed, without significant degradation of the speech signal quality. Thus, a transmitter may include the system for applying high frequency compression without regard to whether a receiver will be capable of re-expanding the signal. Likewise, a receiver may expand a received speech signal without regard to whether the signal was previously compressed.
摘要翻译： 提供了一种用于提高语音信号的质量和可懂度的系统和方法。 该系统和方法将频率压缩应用于语音信号的较高频率分量，同时使较低频率分量基本上保持不变。 这保留了与通常对滤波和带通约束失去的辅音相关的较高频率信息。 保留该信息，而不会显着改变语音信号的基本音调，使得当再现语音信号时，其整体音调质量得以保留。 该系统和方法进一步将频率扩展应用于语音信号。 像压缩一样，只有接收的语音信号的较高频率被扩展。 当频率扩展被应用于根据本发明被压缩的语音信号时，语音信号基本上返回到其预压缩状态。 然而，根据本发明的频率压缩即使当语音信号不再被重新扩展时也提供了改进的可懂度。 同样地，即使原始信号没有被压缩，语音信号也可以被扩展，而语音信号质量没有明显的恶化。 因此，发射机可以包括用于施加高频压缩的系统，而不考虑接收机是否能够重新扩展信号。 类似地，接收机可以扩展接收到的语音信号，而不考虑信号是否先前被压缩。
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公开(公告)号：US20080004868A1
公开(公告)日：2008-01-03
申请号：US11757768
申请日：2007-06-04
IPC分类号： G10L11/04
CPC分类号： G10L21/0364 , G10L25/90 , H03H21/0012 , H03H2220/08
摘要： A signal enhancement system reinforces signal content and improves the signal-to-noise ratio of a signal. The system detects, tracks, and reinforces non-stationary periodic signal components of a signal. The periodic signal components may represent vowel sounds or other voiced sounds. The system may detect, track, and attenuate quasi-stationary signal components in the signal.
摘要翻译： 信号增强系统增强了信号内容，提高了信号的信噪比。 该系统检测，跟踪和加强信号的非平稳周期信号分量。 周期信号分量可以表示元音或其他浊音。 该系统可以检测，跟踪和衰减信号中的准稳态信号分量。
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公开(公告)号：US20070118360A1
公开(公告)日：2007-05-24
申请号：US11287089
申请日：2005-11-22
申请人： Phillip Hetherington , Alex Escott
发明人： Phillip Hetherington , Alex Escott
IPC分类号： G10L11/04
CPC分类号： G10L21/0208 , G10L21/0205 , G10L21/0232 , G10L21/0264
摘要： A voice reinforcement system extracts a portion of a converted speech signal and redirects it towards a listening area where it may be added with the original signal. The system includes a speech input, a filter, and a converter. The speech input generates an intermediate signal from a speech signal. The filter extracts a portion of the signal extending above a cutoff frequency. The converter converts the filtered signal to an aural signal directed towards a listening area.
摘要翻译： 语音增强系统提取转换的语音信号的一部分并将其重定向到可以添加原始信号的收听区域。 该系统包括语音输入，滤波器和转换器。 语音输入从语音信号生成中间信号。 滤波器提取在截止频率之上延伸的信号的一部分。 转换器将滤波后的信号转换成朝向收听区域的听觉信号。
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公开(公告)号：US20070003078A1
公开(公告)日：2007-01-04
申请号：US11130080
申请日：2005-05-16
申请人： Alex Escott , Phillip Hetherington
发明人： Alex Escott , Phillip Hetherington
IPC分类号： H03G3/00
CPC分类号： H03G7/007
摘要： An automatic gain control system maintains desired signal content level, such as voice, in an output signal. The system includes automatic gain control over an input signal, and compensates the output signal based on input signal content. When the input signal level exceeds an upper or lower processing threshold level, or is distorted (e.g., clipped), the system applies a gain to the input signal level. The system may compensate for the gain in the output signal when the input signal includes desired signal content.
摘要翻译： 自动增益控制系统在输出信号中保持期望的信号内容等级，例如语音。 该系统包括对输入信号的自动增益控制，并根据输入信号内容补偿输出信号。 当输入信号电平超过上限或下限处理阈值电平或失真（例如，被限幅）时，系统对输入信号电平施加增益。 当输入信号包括期望的信号内容时，系统可以补偿输出信号中的增益。
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8.发明申请公开(公告)号：US20060241938A1
公开(公告)日：2006-10-26
申请号：US11298053
申请日：2005-12-09
申请人： Phillip Hetherington , Xueman Li
发明人： Phillip Hetherington , Xueman Li
IPC分类号： G10L11/00
CPC分类号： G10L21/02 , G10L21/0232 , G10L21/0264 , G10L21/0364
摘要： A speech enhancement system that improves the intelligibility and the perceived quality of processed speech includes a frequency transformer and a spectral compressor. The frequency transformer converts speech signals from the time domain to the frequency domain. The spectral compressor compresses a pre-selected portion of the high frequency band and maps the compressed high frequency band to a lower band limited frequency range.
摘要翻译： 提高处理语音的可懂度和感知质量的语音增强系统包括频率变换器和频谱压缩器。 变频器将语音信号从时域转换为频域。 频谱压缩器压缩高频带的预选部分，并将压缩的高频带映射到较低频带限制的频率范围。
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公开(公告)号：US20060100868A1
公开(公告)日：2006-05-11
申请号：US11252160
申请日：2005-10-17
IPC分类号： G10L21/02
CPC分类号： G10L21/0208 , G10L21/0232
摘要： A voice enhancement system is provided for improving the perceptual quality of a processed voice signal. The system improves the perceptual quality of a received voice signal by removing unwanted noise from a voice signal recorded by a microphone or from some other source. Specifically, the system removes sounds that occur within the environment of the signal source but which are unrelated to speech. The system is especially well adapted for removing transient road noises from speech signals recorded in moving vehicles. Transient road noises include common temporal and spectral characteristics that can be modeled. A transient road noise detector employs such models to detect the presence of transient road noises in a voice signal. If transient road noises are found to be present, a transient road noise attenuator is provided to remove them from the signal.
摘要翻译： 提供了一种语音增强系统，用于提高处理后的语音信号的感知质量。 该系统通过从麦克风或其他来源记录的语音信号中去除不需要的噪声来提高接收到的语音信号的感知质量。 具体来说，该系统消除在信号源的环境内发生但与语音无关的声音。 该系统特别适用于从记录在移动车辆中的语音信号中消除瞬时道路噪声。 瞬态道路噪声包括可以建模的共同的时间和频谱特征。 瞬时道路噪声检测器采用这种模型来检测语音信号中瞬时道路噪声的存在。 如果发现瞬态道路噪声存在，则提供一个瞬时道路噪声衰减器，以将其从信号中去除。
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公开(公告)号：US20060098809A1
公开(公告)日：2006-05-11
申请号：US11101796
申请日：2005-04-08
IPC分类号： H04M9/08
CPC分类号： G10L21/0364 , G10L25/90
摘要： A signal enhancement system improves the understandability of speech or other audio signals. The system reinforces selected parts of the signal, may attenuate selected parts of the signal, and may increase SNR. The system includes delay logic, a partitioned adaptive filter, and signal reinforcement logic. The partitioned adaptive filter may track and enhance the fundamental frequency and harmonics in the input signal. The partitioned filter output signals may approximately reproduce the input signal, delayed by an integer multiple of the period of the fundamental frequency of the input signal. The reinforcement logic combines the input signal and the filtered signals to produce an enhanced output signal.
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