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在一短段时间里，语音信号保持相对稳定，这种“短时性”是语音信号的重要特性。听觉来源于空气的复合振动，也就是说，语音在频域上的频谱结构反映了语音的特性，在时域上则体现为周期性，然而，周期性是一定长时城才能表现出的整体特性，这样可定义为“长时性”。“长时性”导致了语音特性的时域“有限分辨率”。只有将语音信号的“短时性”和“长时性”相结合，才能提取出最佳的语音特性。
In a short period of time, the voice signal remains relatively stable, this “short-term” is an important feature of voice signals. Hearing comes from the composite vibration of the air, that is to say, the spectral structure of speech in the frequency domain reflects the characteristics of speech and the periodicity in the time domain. However, the periodicity is a certain extent Characteristics, this can be defined as “long-term.” “Longtime” results in the “limited resolution” of the time domain of speech characteristics. Only by combining the “short-term” and “long-term” of the speech signal can the best speech characteristic be extracted.