quadratic time-frequency analysis
quadratic time-frequency analysis
二次时频分析
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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The methods of time frequency analysis include linear, quadratic and adaptive methods. They provide effective tools for analyzing signal time varying spectrum in time frequency plane.
时频分析方法分为线性、二次型和自适应等多种方法，它们提供了在时频二维平面上，分析信号时变功率谱的有效手段。
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