superheterodyne reception

简明释义

超外差式接收法

英英释义

例句

1.With superheterodyne reception, multiple frequencies can be processed simultaneously.

通过超外差接收，多个频率可以同时处理。

2.In amateur radio, superheterodyne reception is a popular choice among enthusiasts.

在业余无线电中，超外差接收是爱好者们的热门选择。

3.The radio uses superheterodyne reception to improve signal clarity.

这台收音机使用超外差接收来提高信号清晰度。

4.Many modern televisions rely on superheterodyne reception for better picture quality.

许多现代电视依靠超外差接收来获得更好的图像质量。

5.The design of the circuit board incorporates superheterodyne reception technology.

电路板的设计采用了超外差接收技术。

作文

The term superheterodyne reception refers to a method of radio signal processing that has significantly improved the performance of radio receivers since its invention in the early 20th century. This technique is essential for tuning into various frequencies and ensuring clear audio quality, which is crucial for both commercial and amateur radio operations. To understand how superheterodyne reception works, it is important to break down its components and the principles behind it.At its core, superheterodyne reception involves mixing the incoming radio signal with a locally generated frequency to produce an intermediate frequency (IF). This process begins with the reception of a radio signal, which may be weak or noisy. The receiver uses a local oscillator to create a stable frequency that is slightly offset from the desired signal frequency. When these two frequencies are mixed, they produce signals at both the sum and difference of the original frequencies. The difference frequency, known as the intermediate frequency, is then filtered and amplified.One of the main advantages of superheterodyne reception is its ability to improve selectivity and sensitivity. By converting the incoming signal to a fixed intermediate frequency, the receiver can utilize more effective filtering techniques to isolate the desired signal from adjacent channels. This results in clearer sound and less interference from other signals. Additionally, the amplification at the intermediate frequency allows for better processing of weak signals, making it easier to receive broadcasts from distant stations.The introduction of superheterodyne reception revolutionized the world of radio technology. Before its widespread adoption, radio receivers were limited in their ability to tune into different frequencies effectively. The superheterodyne design allowed manufacturers to create more versatile and reliable receivers, leading to the proliferation of radio broadcasting in the 1920s and beyond. It laid the foundation for modern communication systems, including television and mobile phones, which still rely on similar principles for signal processing.In practical terms, superheterodyne reception is found in a wide variety of devices. From simple AM/FM radios to complex communication systems used by emergency services, the impact of this technology is far-reaching. For instance, in aviation, pilots depend on superheterodyne receivers to communicate with air traffic control and navigate through various airways safely. Similarly, amateur radio enthusiasts utilize these receivers to connect with others across the globe, showcasing the technology's versatility.Moreover, advancements in digital signal processing have further enhanced the capabilities of superheterodyne reception. Modern receivers can now incorporate digital techniques to improve noise reduction and signal clarity. This evolution demonstrates the enduring relevance of the superheterodyne principle, even as technology continues to advance.In conclusion, superheterodyne reception is a fundamental concept in the field of radio communications that has transformed the way we receive and process signals. Its ability to enhance selectivity and sensitivity has made it a cornerstone of modern radio technology. As we continue to innovate and explore new methods of communication, the principles of superheterodyne reception will remain integral to our understanding of signal processing and transmission. The legacy of this remarkable invention is evident in the myriad of devices we use today, all thanks to the ingenuity of early radio engineers who developed this groundbreaking technique.

术语超外差接收指的是一种无线电信号处理方法，自20世纪初发明以来，它显著提高了无线电接收器的性能。这种技术对于调谐各种频率并确保清晰的音质至关重要，这对于商业和业余无线电操作都是必不可少的。要理解超外差接收的工作原理，重要的是要分解其组成部分及其背后的原理。在其核心，超外差接收涉及将接收到的无线电信号与本地生成的频率混合，以产生中频（IF）。该过程始于接收无线电信号，该信号可能较弱或嘈杂。接收器使用本地振荡器创建一个与所需信号频率略微偏移的稳定频率。当这两个频率混合时，它们会产生原始频率的和与差的信号。差频称为中频，随后被过滤和放大。超外差接收的主要优势之一是其改善选择性和灵敏度的能力。通过将接收到的信号转换为固定的中频，接收器可以利用更有效的过滤技术来隔离所需的信号，从而产生更清晰的声音，并减少来自其他信号的干扰。此外，在中频下的放大使得处理弱信号变得更加容易，使得接收来自远处站点的广播成为可能。超外差接收的引入彻底改变了无线电技术的世界。在其广泛采用之前，无线电接收器在有效调谐不同频率方面受到限制。超外差设计允许制造商创建更具多功能性和可靠性的接收器，导致1920年代及以后无线电广播的普及。它为现代通信系统奠定了基础，包括电视和移动电话，这些系统仍然依赖于类似的信号处理原理。在实际应用中，超外差接收广泛应用于各种设备。从简单的AM/FM收音机到紧急服务使用的复杂通信系统，这项技术的影响深远。例如，在航空领域，飞行员依赖超外差接收器与空中交通管制进行通信，并安全地导航穿越各种航道。类似地，业余无线电爱好者利用这些接收器与全球其他人联系，展示了该技术的多样性。此外，数字信号处理的进步进一步增强了超外差接收的能力。现代接收器现在可以结合数字技术来改善噪声减少和信号清晰度。这一演变表明了超外差原理的持久相关性，即使随着技术的不断进步。总之，超外差接收是无线通信领域的一个基本概念，它改变了我们接收和处理信号的方式。它增强选择性和灵敏度的能力使其成为现代无线电技术的基石。随着我们继续创新和探索新的通信方法，超外差接收的原理将继续在我们理解信号处理和传输中发挥重要作用。这项卓越发明的遗产在我们今天使用的各种设备中显而易见，这一切都归功于早期无线电工程师开发的这一开创性技术。