modulations调制modulationn.调音；调节；转调；抑扬modulation light source调制光源modulation factor meter调制系数测试计modulation spectroscopy调制光谱学modulation intelligence调制信息modulation constellation调制群modulation input circuit调制输入电路modulation-tone factor调制声因数modulation transformator调制变压器modulational instability调制不稳定性modulation noise of tape磁带调制噪声