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预回声对音频压缩编码器的性能影响很大。人们一般采用窗切换技术来降低其不利影响。窗切换中短窗提高了对暂态信号的时间分辨率,同时降低了对低频稳态信号的频率分辨率。设计了一种非均匀时频变换方法,它在保留了对信号低频平稳分量的频率分辨率的同时提高了对高频暂态分量的时间分辨率。最后用实验验证了方法的可行性和有效性。
Pre-echo has a significant impact on the performance of audio compression encoders. People generally use window switching technology to reduce its adverse effects. The short window in the window switch improves the temporal resolution of the transient signal while reducing the frequency resolution of the low-frequency steady-state signal. A nonuniform time-frequency transform method is proposed, which improves the temporal resolution of high-frequency transient components while preserving the frequency resolution of the low-frequency stationary components of the signal. Finally, the feasibility and effectiveness of the method are verified by experiments.