位移能谱密度 instantaneous power spectral density: 瞬间功率谱密度maximum spectral power density: 最大功率频谱密度noise power spectral density: 噪声功率谱密度noise spectral power density: 噪声功率频谱密度noise-power spectral density: 噪音功率谱密度下载手机词典可随时随地查词查翻译