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    • 61. 发明申请
    • A FREQUENCY DOMAIN INTERPOLATIVE SPEECH CODEC SYSTEM
    • 频域插播语音编解码系统
    • WO00060579A1
    • 2000-10-12
    • PCT/US2000/008790
    • 2000-04-04
    • G10L11/02G10L11/04G10L19/00G10L19/02G10L19/04G10L19/08G10L19/14G10L19/12
    • G10L19/18G10L19/005G10L19/02G10L19/0204G10L19/04G10L19/083G10L19/09G10L25/27G10L25/30G10L25/78G10L25/90G10L2019/0012G10L2025/783
    • A prototype word PW gain (34) is vector quantized using a vector quantizer (VQ) that explicitly populates the codebook by representative steady state and transient vectors of PW gain for tracking the abrupt variations in speech levels during onsets and other non-stationary events, while maintaining the accuracy of the speech level during stationary conditions. The rapidly evolving waveform REW (42) and slowly evolving waveform SEW (40) component vectors are converted to magnitude-phase. The variable dimension SEW magnitude vector is quantized using a hierarchical approach. The REW magnitude vector sequence is normalized to unity RMS value. The normalized REW magnitude vectors are modeled by a multi-band sub-band model which converts the variable dimension REW magnitude shape vectors, e.g., six dimensional REW sub-band vectors. The sub-band vectors are averaged over time, resulting in a single average REW sub-band vector for each frame.
    • 使用矢量量化器(VQ)对原型字PW增益(34)进行矢量量化,该矢量量化器(VQ)通过代表稳定状态和PW增益的瞬态矢量显式地填充码本,用于跟踪在开始和其他非平稳事件期间语音电平的突然变化, 同时在静止状态下保持语音水平的准确性。 快速演变的波形REW(42)和缓慢演变的波形SEW(40)分量矢量被转换为幅度相位。 可变尺度SEW幅度矢量使用分层方法进行量化。 REW幅度矢量序列归一化为单位RMS值。 归一化的REW幅度矢量由多频带子带模型建模,该多频带子频带模型转换可变维REW幅度形状矢量,例如六维REW子带矢量。 子带向量随时间平均,导致每个帧的单个平均REW子带向量。
    • 62. 发明申请
    • SPECTRAL PHASE MODELING OF THE PROTOTYPE WAVEFORM COMPONENTS FOR A FREQUENCY DOMAIN INTERPOLATIVE SPEECH CODEC SYSTEM
    • 频域语音语音编解码系统的原型波形组件的频谱相位建模
    • WO00060576A1
    • 2000-10-12
    • PCT/US2000/009073
    • 2000-04-04
    • G10L11/02G10L11/04G10L19/00G10L19/02G10L19/04G10L19/08G10L19/14G10L19/06
    • G10L19/18G10L19/005G10L19/02G10L19/0204G10L19/04G10L19/083G10L19/09G10L25/27G10L25/30G10L25/78G10L25/90G10L2019/0012G10L2025/783
    • Encoding of prototype waveform (PW) components applicable to GeoMobile and Telephony Earth Station (TES), provides improved voice quality, enabling a dual-channel mode of operation which permits more users to communicate over the same physical channel. A PW gain (34) is quantized using a vector quantizer (VQ) having a codebook representative of steady-state and transient vectors for tracking abrupt speech level variations during onsets and other non-stationary events, while maintaining accuracy during stationary conditions. The rapidly evolving waveform (REW) and slowly evolving waveform (SEW) component vectors, (42) and (40), respectively, are converted to magnitude-phase. A voicing measure, characterizing the degree of signal periodicity, and an interpolated pitch countour, based on estimated open loop pitch, are determined for each speech frame. Only the SEW and REW spectral magnitude information, the voicing measure, and pitch frequency countour are transmitted. The SEW phase component is reconstructed at the decoder from this information. The REW phase component is reconstructed at the decoder from the reconstructed SEW component, the voicing measure, REW magnitudes, and the pitch frequency contour information.
    • 适用于地理移动和电话地球站(TES)的原型波形(PW)组件的编码提供了改进的语音质量,实现了双通道操作模式,允许更多用户通过相同的物理通道进行通信。 使用具有代表稳态和瞬态向量的码本的矢量量化器(VQ)来量化PW增益(34),用于跟踪在开启和其他非平稳事件期间的突发语音电平变化,同时在稳定条件期间保持精度。 快速演变的波形(REW)和缓慢演变的波形(SEW)分量矢量(42)和(40)分别被转换为幅度相位。 对于每个语音帧,确定基于估计的开环间距的表征度量,表征信号周期的程度和内插音调countour。 仅发送SEW和REW频谱幅度信息,发声测量和音调频率countour。 在该信息的解码器上重构SEW相位分量。 REW相位分量在解码器处从重建的SEW分量,发音测量,REW幅度和音调频率轮廓信息重建。