1. The intermediate frequency is the frequency at which signals are amplified and filtered in a radio receiver.
中频是收音机中信号被放大和过滤的频率。

2. In a superheterodyne receiver, the intermediate frequency is typically around 455 kHz.
在超外差接收机中，中频通常在455千赫左右。

3. The intermediate frequency stage is crucial in ensuring that the desired signals are properly processed.
中频阶段对确保所需信号得到正确处理至关重要。

4. The intermediate frequency bandpass filter helps to isolate the desired signal from unwanted noise.
中频带通滤波器有助于将所需信号与不需要的噪声隔离开来。

5. Tuning the intermediate frequency can improve the sensitivity and selectivity of the receiver.
调整中频可以提高接收机的灵敏度和选择性。

6. The intermediate frequency oscillator generates the signal that is mixed with the incoming radio frequency signal.
中频振荡器产生的信号与传入的射频信号混合。