1. A tone control system designed to compensate for frequency distortion in audio systems. 
   补偿器在音响系统中用来补偿频率扭曲的音调控制系统
2. The difference or interval between the smallest and largest values in a frequency distribution. 
   极差频率分布上最大值与最小值之间的差别或距离
3. An amplifier with very wide frequency response which can amplify pulses without distortion of the short rise time of the leading edge. 
   频率响应极宽的一类放大器，可以无畸变地放大前沿上升时间短的脉冲。
4. To combine(a radio-frequency wave) with a locally generated wave of different frequency in order to produce a new frequency equal to the sum or difference of the two. 
   外差把（一个无线电频率波）与另一个频率不同的局部产生的电波层混合，以产生相当于原来两个的总和或差拍的新频率
5. combine (a radio frequency wave) with a locally generated wave of a different frequency so as to produce a new frequency equal to the sum or the difference between the two. 
   把一种无线电频率和当地不同的另一种频率混合的一起。

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