time quadrature meaning in English

90°时间相移

The paper also studies fast arithmetic and programming of discrete time quadrature wt and wpt and takes a deep look into their additional applications in motor testing , including denoising , filtering and so on . starting from basic theory of time - frequency analysis and wavelet analysis of asymptotic signals , this paper investigates several if law extraction methods and presents an especially effective one using wavelet ridge
论文从时频分析的基本理论出发，在渐进信号小波分析的基础上，研究了渐进信号小波变换的渐进估计方法，提出了利用小波脊线来提取信号频率随时间连续变化规律(即瞬时频率)的方法。