heterodyne reception

简明释义

外差接收法

英英释义

例句

1.The scientist demonstrated how heterodyne reception can enhance the performance of radar systems.

科学家演示了如何通过外差接收提高雷达系统的性能。

2.In amateur radio, heterodyne reception allows operators to tune into distant stations.

在业余无线电中，外差接收使操作员能够调谐到遥远的电台。

3.Many modern communication systems rely on heterodyne reception to process weak signals.

许多现代通信系统依赖于外差接收来处理微弱信号。

4.Using heterodyne reception, the team was able to detect signals that were previously undetectable.

利用外差接收，团队能够检测到以前无法检测到的信号。

5.The radio engineer explained that the key to improving signal clarity is through heterodyne reception.

无线电工程师解释说，提高信号清晰度的关键在于外差接收。

作文

In the realm of telecommunications and signal processing, the term heterodyne reception refers to a technique used to convert a received signal into a lower frequency for easier processing. This method is particularly significant in radio communications, where signals are often transmitted over long distances and can be weak or distorted. By employing heterodyne reception, engineers can improve the clarity and quality of the received signals, making it an essential aspect of modern communication systems.The basic principle behind heterodyne reception involves mixing the incoming radio frequency (RF) signal with a locally generated signal from a local oscillator. This mixing process produces two new frequencies: one that is the sum of the original frequencies and another that is the difference. Typically, the difference frequency is much lower than the original RF signal, which allows for more straightforward amplification and filtering. This lower frequency is referred to as the intermediate frequency (IF).One of the primary advantages of using heterodyne reception is its ability to enhance sensitivity. By converting the high-frequency RF signal to a lower IF, receivers can utilize more effective amplification techniques that would otherwise be challenging to implement at higher frequencies. This increased sensitivity is crucial in applications such as satellite communications, where signals can be extremely weak by the time they reach Earth.Moreover, heterodyne reception enables better selectivity. With the IF stage, filters can be designed to target specific frequencies more effectively, allowing the receiver to isolate the desired signal while rejecting unwanted noise and interference. This characteristic is particularly important in crowded frequency bands where multiple signals may overlap.The implementation of heterodyne reception is not limited to traditional radio systems; it is also fundamental in various modern technologies, including digital television, mobile phones, and radar systems. In these applications, the principles of heterodyne reception are adapted to meet the specific requirements of each technology, demonstrating its versatility and importance in the field of electronics.In conclusion, the concept of heterodyne reception is integral to the functioning of numerous communication systems. By facilitating the conversion of high-frequency signals to more manageable frequencies, this technique enhances both the sensitivity and selectivity of receivers. As technology continues to evolve, the principles behind heterodyne reception will undoubtedly remain relevant, ensuring clear and reliable communication across various platforms. Understanding this principle is essential for anyone interested in telecommunications, as it lays the foundation for many modern advancements in the field.

在电信和信号处理领域，术语异频接收指的是一种将接收到的信号转换为较低频率以便于处理的技术。这种方法在无线电通信中尤为重要，因为信号通常会经过长距离传输，并可能变得微弱或失真。通过采用异频接收，工程师可以提高接收信号的清晰度和质量，使其成为现代通信系统的重要组成部分。异频接收的基本原理涉及将接收到的射频（RF）信号与本地振荡器生成的本地信号混合。这一混合过程产生两个新频率：一个是原始频率的和，另一个是差频。通常情况下，差频远低于原始RF信号，从而允许更简单的放大和滤波。这个较低的频率被称为中频（IF）。使用异频接收的主要优点之一是能够增强灵敏度。通过将高频RF信号转换为较低的IF，接收器能够利用更有效的放大技术，而这些技术在更高频率下实施则会比较困难。这种灵敏度的提升在卫星通信等应用中至关重要，因为信号到达地球时可能非常微弱。此外，异频接收还实现了更好的选择性。在IF阶段，可以设计滤波器以更有效地针对特定频率，从而使接收器能够隔离所需信号，同时拒绝不必要的噪声和干扰。这一特性在多个信号可能重叠的拥挤频带中特别重要。异频接收的实施并不仅限于传统无线电系统；它在各种现代技术中也是基础，包括数字电视、手机和雷达系统。在这些应用中，异频接收的原理被调整以满足每种技术的具体要求，展示了其在电子领域的多样性和重要性。总之，异频接收的概念对于众多通信系统的功能至关重要。通过促进将高频信号转换为更易于管理的频率，这一技术增强了接收器的灵敏度和选择性。随着技术的不断发展，异频接收背后的原理无疑将继续保持相关性，确保在各种平台上实现清晰和可靠的通信。理解这一原理对于任何对电信感兴趣的人来说都是必不可少的，因为它为该领域的许多现代进步奠定了基础。