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1. 发明申请

WO2004064039A3 METHOD AND APPARATUS FOR ARTIFICIAL BANDWIDTH EXPANSION IN SPEECH PROCESSING 审中-公开
标题翻译：用于语音处理中的人造带宽扩展的方法和设备
公开(公告)号：WO2004064039A3
公开(公告)日：2004-11-25
申请号：PCT/IB2004000030
申请日：2004-01-09
申请人： NOKIA CORP , NOKIA INC , KALLIO LAURA , ALKU PAAVO , KAEYHKOE KIMMO , KAJALA MATTI , VALVE PAEIVI
发明人： KALLIO LAURA , ALKU PAAVO , KAEYHKOE KIMMO , KAJALA MATTI , VALVE PAEIVI
IPC分类号： G10L20060101 , G10L11/06 , G10L19/00 , G10L19/06 , G10L21/02
CPC分类号： G10L21/038 , G10L25/93
摘要： A method and device for improving the quality of speech signals transmitted using an audio bandwidth between 300 Hz and 3.4 kHz. After the received speech signal is divided into frames, zeros are inserted between samples to double the sampling frequency. The level of these aliased frequency components is adjusted using an adaptive algorithm based on the classification of the speech frame. Sound can be classified into sibilants and non-sibilants, and a non-sibilant sound can be further classified into a voiced sound and a stop consonant. The adjustment is based on parameters, such as the number of zero-crossings and energy distribution, computed from the spectrum of the up-sampled speech signal between 300 Hz and 3.4kHz. A new sound with a bandwidth between 300 Hz and 7.7kHz is obtained by inverse Fourier transforming the spectrum of the adjusted, up-sampled sound.
摘要翻译：一种用于改善使用300Hz和3.4kHz之间的音频带宽发送的语音信号的质量的方法和设备。在接收的语音信号被分成帧之后，在样本之间插入零以使采样频率加倍。使用基于语音帧分类的自适应算法来调整这些混叠频率分量的级别。声音可以分为s音和非s音，非s sound声音可以进一步分类为浊音和停止辅音。该调整基于参数，例如从300Hz到3.4kHz之间的上采样语音信号的频谱计算的零交叉点和能量分布的数量。通过对经过调整的上采样声音的频谱进行傅立叶逆变换，可获得带宽在300赫兹和7.7千赫之间的新声音。

2. 发明申请

WO2005117517A3 NEUROEVOLUTION-BASED ARTIFICIAL BANDWIDTH EXPANSION OF TELEPHONE BAND SPEECH 审中-公开
标题翻译：基于神经病学的人造电话带宽扩展
公开(公告)号：WO2005117517A3
公开(公告)日：2006-03-16
申请号：PCT/IB2005001248
申请日：2005-05-09
申请人： NOKIA CORP , NOKIA INC , KONTIO JUHO , ALKU PAAVO , LAAKSONEN LAURA
发明人： KONTIO JUHO , ALKU PAAVO , LAAKSONEN LAURA
IPC分类号： G06N3/08 , G10L19/14 , G10L21/02
CPC分类号： G06N3/086 , G10L21/038 , G10L25/30
摘要： Artificial bandwidth expansion devices, systems, methods and computer code products are disclosed for expanding a narrowband speech signal into an artificially expanded wideband speech signal. Embodiments of the invention can operate by forming an unshaped wideband signal based on the narrowband speech signal, such as through aliasing, and shaping the wideband signal into the artificially expanded wideband speech signal by amplifying/attenuating the unshaped wideband signal using a function generated by a neural network. Weights of the neural network can be set by a training/learning subsystem which generates genomes containing the neural network weights based on simulated environments in which a device employing the artificial bandwidth expansion is expected to operate.
摘要翻译：公开了用于将窄带语音信号扩展成人为扩展的宽带语音信号的人造带宽扩展设备，系统，方法和计算机代码产品。本发明的实施例可以通过基于窄带语音信号（诸如通过混叠）形成未形成的宽带信号来进行操作，并且通过使用由...产生的函数来放大/衰减未形成的宽带信号，将宽带信号整形成人为扩展的宽带语音信号神经网络。神经网络的权重可以由训练/学习子系统设置，该训练/学习子系统基于期望使用人造带宽扩展的设备运行的模拟环境生成包含神经网络权重的基因组。

3. 发明申请

WO9805031A2 A METHOD AND A DEVICE FOR THE REDUCTION IMPULSE NOISE FROM A SPEECH SIGNAL 审中-公开
标题翻译：一种用于从语音信号中减少语音噪声的方法和装置
公开(公告)号：WO9805031A2
公开(公告)日：1998-02-05
申请号：PCT/FI9700458
申请日：1997-07-25
申请人： ALKU PAAVO
发明人： ALKU PAAVO
IPC分类号： G10L21/0208 , G10L25/12 , G10L9/14
CPC分类号： G10L21/0208 , G10L25/12
摘要： Samples or numerical values representing the samples that represent a signal feature (2) which cannot have been produced by the human sound production system are removed from a digital speech signal. Applied to the LPC method, the numerical values that produce residual energy, the ratio of which to the residual energy calculated when the numberical value in question has been replaced by an LPC estimate exceeds a certain threshold condition, are interpreted as noise and the corresponding sample in the signal waveform is replaced by an estimate (4) according to the LPC method. The method particularly reduces the effect of impulse noise and it can be included in the D/A conversion (21) of a sound-reproducing apparatus. The method is advantageously applied to mobile communication systems, in particular to the GSM system.
摘要翻译：从数字语音信号中去除表示不能由人类声音产生系统产生的信号特征（2）的样本的样本或数值。应用于LPC方法时，产生剩余能量的数值，当所讨论的数值被LPC估计代替时计算出的剩余能量的比值超过一定的阈值条件，被解释为噪声，相应的样本根据LPC方法将信号波形替换为估计（4）。该方法特别地降低了脉冲噪声的影响，并且可以包括在声音再现装置的D / A转换（21）中。该方法有利地应用于移动通信系统，特别是应用于GSM系统。

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