所谓倒谱,就是信号对数功率谱的功率谱。 倒谱的数学表达式为: 倒谱算法的原理为:信号经过功率谱运算并滤波后,成为加权的正弦信号的形式,再经过求对数和功率谱变换,就得到了表示直扩信号存在的脉冲输出,此脉冲的位置表示了该正弦信号的频率,如图2所示,由此可得到PN码周期。如果输入信号不是扩频信号,假设为一正弦信号,则其第一个功率谱变换为一脉冲,经滤波后进入第二次功率谱变换,其输出为幅度很低的三角波输出,因而检测不到其存在。 倒谱法是信号处理和信号检测中的经典方法。
Simulation results show that the modified cepstrum method based on the modern spectrum estimation is better than the one based on the conventional spectrum estimation.
仿真结果表明,应用现代谱估计的倒谱法比应用经典谱估计的倒谱法估计效果更好。
参考来源 - 基于软件无线电的通信侦察接收机关键技术研究·2,447,543篇论文数据,部分数据来源于NoteExpress
目前国内外声混响消减方法很多,如复倒谱法、逆滤波法、波束形成等。
So far, many kinds of dereverberation methods have been developed, such as complex cepstrum filtering, inverse filtering, beam forming and so on.
对基音检测的倒谱法进行了分析,指出其在基音检测计算及其数字实现时存在不足。
The cepstrum method of speech pitch detection was analyzed carefully, and several shortcomings were pointed out when the method was realized digitally.
对牛胫骨和人离体跟骨松质骨中的超声背散射信号采用AR倒谱法进行了分析,并估计了牛胫骨和人离体跟骨中骨小梁的平均间距。
The paper applies AR cepstrum to process the backscattered signals of pig liver in vitro, and the mean spacing of hepatic lobules has been estimated.
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