active filter

简明释义

1. 有源滤波器; 2. 活性滤波器;

英英释义

例句

1.In this circuit, the active filter helps to eliminate noise from the signal.

在这个电路中，有源滤波器有助于消除信号中的噪声。

2.The active filter was implemented in the audio system to remove unwanted frequencies.

该有源滤波器在音频系统中实施，以去除不必要的频率。

3.Using an active filter can significantly improve the performance of communication systems.

使用有源滤波器可以显著提高通信系统的性能。

4.The audio engineer used an active filter to enhance the bass frequencies in the music mix.

音频工程师使用了一个有源滤波器来增强音乐混音中的低频。

5.The design of the active filter allows for better control over the cutoff frequency.

该有源滤波器的设计允许更好地控制截止频率。

作文

In the field of electronics, the term active filter refers to a type of electronic filter that uses active components such as operational amplifiers (op-amps), transistors, or other gain devices to enhance its performance. Unlike passive filters, which only utilize resistors, capacitors, and inductors, active filters can provide gain and have the ability to produce a higher quality output signal. This makes them particularly useful in various applications, including audio processing, signal conditioning, and communications systems.One of the primary advantages of using an active filter is its ability to achieve sharper roll-off characteristics compared to passive filters. For instance, a second-order passive low-pass filter typically offers a roll-off rate of 12 dB per octave, whereas an active filter can provide a roll-off rate of 24 dB per octave or more. This means that active filters can more effectively eliminate unwanted frequencies from a signal, allowing for cleaner and more precise outputs.Another significant benefit of active filters is their versatility. They can be designed to function as low-pass, high-pass, band-pass, or notch filters, depending on the application requirements. For example, a low-pass active filter allows signals below a certain frequency to pass through while attenuating higher frequencies. In contrast, a high-pass active filter does the opposite by allowing higher frequencies to pass while blocking lower ones. This flexibility makes active filters indispensable in modern electronic circuits.Moreover, active filters can be easily tuned and adjusted to meet specific filtering needs. By changing the values of the resistors and capacitors in the circuit, engineers can modify the cutoff frequency and gain of the filter without needing to redesign the entire system. This adaptability is particularly beneficial in research and development environments where experimental setups often require frequent adjustments.However, it is essential to consider the limitations of active filters as well. One notable drawback is their dependency on a power supply, which passive filters do not require. This reliance on power can limit the application of active filters in battery-operated devices where energy efficiency is critical. Additionally, active filters may introduce noise into the signal due to the active components used, which can be a concern in high-fidelity audio applications.Despite these challenges, the advantages of active filters often outweigh their drawbacks, making them a preferred choice in many scenarios. Their ability to provide gain, superior roll-off characteristics, and versatile design options makes them a fundamental tool in the arsenal of electronic engineers. As technology continues to advance, the role of active filters in shaping the future of electronic devices will undoubtedly remain significant. In conclusion, understanding and utilizing active filters is crucial for anyone involved in electronics, as they play a vital role in ensuring the quality and integrity of signals in various applications.

在电子学领域，术语主动滤波器指的是一种使用运算放大器（op-amps）、晶体管或其他增益元件等有源元件来增强其性能的电子滤波器。与仅利用电阻、电容和电感的被动滤波器不同，主动滤波器可以提供增益，并且能够产生更高质量的输出信号。这使得它们在音频处理、信号调理和通信系统等各种应用中特别有用。使用主动滤波器的主要优点之一是它能够实现比被动滤波器更尖锐的滚降特性。例如，二阶被动低通滤波器通常提供每八度12 dB的滚降率，而主动滤波器可以提供24 dB每八度或更高的滚降率。这意味着主动滤波器可以更有效地消除信号中的不必要频率，从而允许更干净、更精确的输出。另一个显著的好处是主动滤波器的多功能性。根据应用需求，它们可以设计为低通、高通、带通或陷波滤波器。例如，低通主动滤波器允许某一频率以下的信号通过，同时衰减较高的频率。相反，高通主动滤波器则允许较高频率通过，同时阻止较低频率。这种灵活性使得主动滤波器在现代电子电路中不可或缺。此外，主动滤波器可以很容易地调节和调整以满足特定的过滤需求。通过改变电路中电阻器和电容器的值，工程师可以在不需要重新设计整个系统的情况下修改滤波器的截止频率和增益。这种适应性在研究和开发环境中尤为有益，因为实验设置通常需要频繁调整。然而，也必须考虑主动滤波器的局限性。其中一个显著的缺点是它们依赖于电源，而被动滤波器则不需要。这种对电力的依赖可能限制主动滤波器在电池供电设备中的应用，尤其是在能源效率至关重要的情况下。此外，由于使用了主动元件，主动滤波器可能会在信号中引入噪声，这在高保真音频应用中可能是一个问题。尽管存在这些挑战，主动滤波器的优点往往超过其缺点，使其在许多场景中成为首选。它们提供增益、优越的滚降特性和多样化的设计选项，使其成为电子工程师工具箱中的基本工具。随着技术的不断进步，主动滤波器在塑造电子设备未来中的作用无疑将保持重要。总之，理解和利用主动滤波器对于任何参与电子学的人来说都是至关重要的，因为它们在确保各种应用中信号的质量和完整性方面发挥着重要作用。