superheterodyne receiver

简明释义

超外差式接收机

英英释义

例句

1.The design of a superheterodyne receiver 超外差接收器 includes a local oscillator and a mixer.

一个超外差接收器的设计包括本地振荡器和混频器。

2.In amateur radio, a superheterodyne receiver 超外差接收器 allows operators to tune into distant stations.

在业余无线电中，超外差接收器允许操作员调谐到遥远的电台。

3.The superheterodyne receiver 超外差接收器 is widely used in modern radios to improve signal quality.

现代收音机广泛使用超外差接收器来提高信号质量。

4.Engineers often prefer the superheterodyne receiver 超外差接收器 for its ability to process multiple frequencies.

工程师通常更喜欢超外差接收器，因为它能够处理多个频率。

5.Many television sets use a superheterodyne receiver 超外差接收器 to receive broadcast signals.

许多电视机使用超外差接收器来接收广播信号。

作文

The development of radio technology has significantly transformed the way we communicate and receive information. One of the most important inventions in this field is the superheterodyne receiver, which has become the standard design for most modern radio receivers. Understanding how a superheterodyne receiver works can provide insight into its efficiency and effectiveness in processing radio signals.A superheterodyne receiver operates by mixing a received radio frequency signal with a locally generated frequency to produce an intermediate frequency (IF). This process is essential because it allows for better selectivity and sensitivity compared to other types of receivers. The key advantage of the superheterodyne receiver lies in its ability to amplify and filter signals more effectively, making it possible to pick up weaker signals without interference from stronger ones.The basic components of a superheterodyne receiver include an antenna, a mixer, a local oscillator, an IF amplifier, and a detector. The antenna captures the incoming radio waves, which are then fed into the mixer. The mixer combines the incoming signal with the output of the local oscillator, creating two new frequencies: one at the sum of the two frequencies and another at their difference. The difference frequency is what we call the intermediate frequency (IF).This intermediate frequency is typically much lower than the original radio frequency, which makes it easier to process. The IF signal is then amplified using an IF amplifier, which enhances the strength of the signal while maintaining its quality. After amplification, the signal is detected to retrieve the original audio or data content that was transmitted.One of the reasons the superheterodyne receiver is so widely used is due to its versatility. It can be employed in various applications, from AM and FM radio to television and even in mobile phones. The design allows for the use of high-quality filters at the IF stage, which helps to eliminate unwanted noise and interference, thereby improving the overall sound quality.Moreover, the superheterodyne receiver can be easily tuned to different frequencies by adjusting the local oscillator. This tunability is crucial for receiving multiple channels and provides users with a seamless listening experience. As technology has advanced, the principles behind the superheterodyne receiver have also evolved, leading to the development of digital signal processing techniques that further enhance its capabilities.In conclusion, the superheterodyne receiver has played a pivotal role in the evolution of radio technology. Its ingenious design allows for effective signal processing, enabling users to enjoy clear and reliable communication across various platforms. As we continue to innovate in the realm of wireless communication, the principles established by the superheterodyne receiver will undoubtedly remain relevant, paving the way for future advancements in technology.

无线电技术的发展显著改变了我们沟通和接收信息的方式。在这个领域中，最重要的发明之一就是超外差接收机，它已成为大多数现代无线电接收机的标准设计。理解超外差接收机的工作原理可以让我们深入了解其在处理无线电信号时的效率和有效性。超外差接收机通过将接收到的无线电频率信号与本地生成的频率混合来产生一个中频(IF)。这个过程是至关重要的，因为它允许比其他类型的接收机更好的选择性和灵敏度。超外差接收机的主要优点在于其能够更有效地放大和过滤信号，使得能够在没有强干扰的情况下接收较弱的信号。超外差接收机的基本组成部分包括天线、混频器、本地振荡器、中频放大器和解调器。天线捕获进入的无线电波，然后将其输入到混频器中。混频器将进入的信号与本地振荡器的输出相结合，产生两个新频率：一个是两个频率的和，另一个是它们的差。差频就是我们所称的中频(IF)。这个中频通常远低于原始无线电频率，这使得处理信号更容易。中频信号随后通过中频放大器进行放大，增强信号的强度，同时保持其质量。放大后，通过解调器检索出原始音频或数据内容。超外差接收机如此广泛使用的原因之一是其多功能性。它可以应用于各种场合，从AM和FM无线电到电视甚至手机。这种设计允许在中频阶段使用高质量的滤波器，有助于消除不必要的噪声和干扰，从而改善整体音质。此外，调整本地振荡器可以轻松调谐超外差接收机到不同的频率。这种可调性对于接收多个频道至关重要，并为用户提供无缝的收听体验。随着技术的进步，超外差接收机背后的原理也不断演变，导致数字信号处理技术的发展，进一步增强了其能力。总之，超外差接收机在无线电技术的发展中发挥了关键作用。其巧妙的设计允许有效的信号处理，使用户能够在各种平台上享受清晰可靠的通信。随着我们在无线通信领域的持续创新，超外差接收机所确立的原理无疑将继续保持相关性，为未来的技术进步铺平道路。