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第一代技术，或1G，是模拟信号，只能传输语音通话。 The first generation, or 1g, technology was analog and transmitted voice calls only. | ||
模数转换关键性的第一步是对模拟信号进行采样。 The first essential step in analog-to-digital conversion is to sample an analog signal. | ||
模拟信号由直流和交流分量、频率和相位四部分组成。 An analog signal is composed of four basic components: DC and AC magnitudes, frequency, and phase. | ||
本系统实现了微机功能的扩展，可以实现对模拟信号的采集和数据显示等。 This system extended the function of micro-computer and it can be used to sample analog signals and display data. | ||
一种用于将数字信号转换为模拟信号的数模转换器(DAC)，包括第一温度计解码器和第二温度计解码器。 A digital-to-analog converter (DAC) for converting a digital signal to an analog signal includes a first thermometer decoder and a second thermometer decoder. | ||
研究了应用线性光耦合器组成模拟信号隔离电路的设计方法、调试方法以及提高线性度的方法。 The design method, debug method and the method of enhancing degree of linearity are researched in the constituting of analog signal isolating circuit with linear optical couplers. | ||
理想的软件无线电电台要求对天线接收的模拟信号经过放大后直接采样，但由于技术所限很难实现，而多采用中频采样的方法。 The ideal software radio requires the sampling system directly samples the amplified signal which was received by the antenna, but it can't be implemented due to the limit of technology. | ||
