Goldsmith said that most second-generation, or 2G, cell phones use a combination of time division and frequency division.
戈德史密斯说，大多数第二代手机或2G手机采用时间划分和频率划分相结合的方式。
Firstly, phonemes should be extracted on the time domain, the frequency domain and energy then the combination character of each sample and map figure were calculated.
首先对语音音素进行时域、频域、能量值的提取，然后通过计算得到每个采样点的组合特征值，描绘成图像。
The authors propose a new method with combination of time domain and frequency domain by using the time-frequency distribution image of the radar signal.
借助于雷达信号的时频分布图像，提出了一种在时频联合域上进行信号识别的新算法。
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