以下为句子列表：
英文: In an AM transmission the carrier wave is constant in frequency and varies in amplitude (strength) according to the sounds present at the microphone; in FM the carrier is constant in amplitude and varies in frequency.
中文: 在调幅的传播中，其负载电波频率是恒定的，但波幅(力度)随着麦克风声音变化而变化；在调频的传播中，其负载电波波幅是恒定的，而频率随着麦克风声音的变化而变化。
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英文: In both radio and television receivers, once the basic signals have been separated from the carrier wave they are fed to a loudspeaker or a display device (usually a cathode-ray tube), where they are converted into sound and visual images, respectively.
中文: 在无线电和电视两个接收器中，一旦基本信号与载体电波分离，即被供于扩音器或显示设备(通常是阴极摄像管)，在那里它分别被转换成声音和可视图像。
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英文: In communications, the frequency range of the information bearing signals prior to combination with carrier wave by modulation.
中文: 在通信技术中,未经调制使之和载波结合之前,携带信息的信号所占有的频率范围。
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英文: The power of the modulated carrier wave is increased by the RF power amplifier.
中文: 射频功率放大器增加了调变载波的功率。
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英文: The sounds and images are converted into electrical signals by a microphone (sounds) or video camera (images), amplified, and used to modulate a carrier wave that has been generated by an oscillator circuit in a transmitter.
中文: 声音合图像由话筒(声音)或摄像机(图像)转换为电子信号，经过放大后，用来调制发射器中一个振荡器产生的负载电波。
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