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12. 发明授权

US4776014A Method for pitch-aligned high-frequency regeneration in RELP vocoders 失效
标题翻译： RELP声码器中音调对齐高频再生的方法
公开(公告)号：US4776014A
公开(公告)日：1988-10-04
申请号：US902987
申请日：1986-09-02
申请人： Richard L. Zinser, Jr.
发明人： Richard L. Zinser, Jr.
IPC分类号： G10L19/04 , G10L19/08 , G10L7/02 , G10L9/00
CPC分类号： G10L19/08
摘要： A method for pitch-aligned high frequency regeneration of a speech signal which has been sampled at a known sampling frequency f.sub.S and decimated at a known integer decimation ratio N practiced in the receiver portion of a RELP vocoder includes the steps of: providing at least one local carrier signal(s), (each) at a frequency which is an exact integer multiple of a baseband pitch estimate frequency recovered from received data; amplitude modulating each of the local carrier signals with baseband residual data recovered in the receiver portion to provide partial spectrum data; removing, only if the decimation ratio is even, the lower sideband data from the lowest frequency local carrier signal to obtain partial spectrum data; and adding the residual baseband data to the partial spectrum data to obtain PA-HFRed output data from which to reconstruct the speech signal.The method results in a more natural sounding regenerated spectrum than ordinary spectral folding and doesn't require modification of the existing REPL transmitter section. An even decimation ratio is preferred because an improvement in the quality of the reconstituted speech is realized and considerably less processor time and memory are required. Because even decimation ratios result in spectral inversion of the baseband signals, high-pass filtering is used is remove the lower sideband associated with a first local carrier from the rengenerated signal.
摘要翻译：已经以已知采样频率fS采样并以已知的整数抽取比例N抽取的语音信号的音调对准高频再生方法在RELP声码器的接收机部分中实施，包括以下步骤：提供至少一个本地载波信号，（每个）以从接收到的数据恢复的基带间距估计频率的精确整数倍的频率; 使用在接收机部分中恢复的基带残差数据对每个本地载波信号进行幅度调制以提供部分频谱数据; 只有在抽取比例均匀的情况下，从最低频率本地载波信号中移除下边带数据才能获得部分频谱数据; 并将残余基带数据添加到部分频谱数据中，以获得从其重构语音信号的PA-HFRed输出数据。该方法产生比普通光谱折叠更自然的再生光谱，并且不需要修改现有的REPL发射机部分。甚至抽取比例是优选的，因为实现了重构语音的质量的提高，并且需要相当少的处理器时间和记忆。因为甚至抽取比率导致基带信号的频谱反转，所以使用高通滤波来从再生信号中去除与第一本地载波相关联的下边带。

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