amplitude modulation

简明释义

调幅

英英释义

例句

1.In amplitude modulation, the amplitude of the carrier wave is varied in proportion to the message signal.

在幅度调制中，载波的幅度根据信息信号的变化而变化。

2.The radio station uses amplitude modulation to transmit its signals over long distances.

这个广播电台使用幅度调制将信号传输到远距离。

3.Many AM radios operate using amplitude modulation to receive broadcasts.

许多AM收音机使用幅度调制接收广播。

4.One advantage of amplitude modulation is its simplicity in implementation.

幅度调制的一大优点是其实现的简单性。

5.The quality of sound in amplitude modulation can be affected by interference from other signals.

在幅度调制中，声音质量可能会受到其他信号干扰的影响。

作文

Amplitude modulation, often abbreviated as AM, is a technique used in electronic communication, most commonly for transmitting information via a radio carrier wave. The fundamental concept behind amplitude modulation (幅度调制) is to vary the strength, or amplitude, of the carrier wave in proportion to the waveform being sent. This allows the transmission of audio signals, such as music or voice, over long distances. Understanding amplitude modulation is crucial for anyone interested in the field of telecommunications, radio broadcasting, or even amateur radio operations.The history of amplitude modulation can be traced back to the early 20th century when inventors and engineers were experimenting with methods to transmit sound wirelessly. The first successful demonstration of AM radio was conducted by Reginald Fessenden in 1906, which marked the beginning of radio broadcasting. This breakthrough allowed for the transmission of voice and music, revolutionizing communication and entertainment.In technical terms, amplitude modulation involves combining two signals: the carrier wave and the message signal. The carrier wave is a high-frequency signal that acts as a vehicle for the information being transmitted. The message signal, on the other hand, is the actual information we want to send, such as speech or music. By varying the amplitude of the carrier wave in accordance with the amplitude of the message signal, we create a modulated wave that can be transmitted through the air.One of the key advantages of amplitude modulation is its simplicity. The equipment required for AM transmission and reception is relatively straightforward, making it accessible for both commercial broadcasters and hobbyists. Additionally, AM signals can travel great distances, especially at lower frequencies, which is why they are often used for long-range communication.However, amplitude modulation is not without its drawbacks. One significant disadvantage is its susceptibility to noise and interference. Because the information is encoded in the amplitude of the signal, any fluctuations caused by environmental factors, such as electrical storms or physical obstacles, can distort the message. This is why FM (frequency modulation) has become more popular for music broadcasting, as it offers better sound quality and resistance to interference.Despite these challenges, amplitude modulation remains an important part of the communication landscape. Many AM radio stations continue to operate, providing news, talk shows, and other programming to listeners around the world. Furthermore, the principles of amplitude modulation have influenced various technologies beyond radio, including television broadcasting and even some forms of data transmission.In conclusion, amplitude modulation is a foundational technology in the realm of electronic communication. Its ability to convey information over long distances has made it a vital tool in broadcasting history. While newer technologies may offer advantages in terms of sound quality and resilience to interference, understanding the principles of amplitude modulation is essential for grasping the evolution of communication systems. As technology continues to advance, the legacy of amplitude modulation will undoubtedly remain a key chapter in the story of how we connect and share information across the globe.

幅度调制，通常缩写为AM，是一种用于电子通信的技术，最常用于通过无线电载波传输信息。幅度调制（amplitude modulation）的基本概念是根据要发送的波形变化载波波的强度或幅度。这允许将音频信号，如音乐或声音，远距离传输。理解幅度调制对任何对电信、广播或甚至业余无线电操作感兴趣的人来说都是至关重要的。幅度调制的历史可以追溯到20世纪初，当时发明家和工程师们正在实验无线传输声音的方法。1906年，雷金纳德·费森登成功演示了AM无线电，这标志着广播的开始。这一突破使得声音和音乐的传输成为可能，彻底改变了通信和娱乐。在技术上，幅度调制涉及将两个信号结合在一起：载波波和消息信号。载波波是一个高频信号，作为要传输信息的载体。另一方面，消息信号是真正我们想要发送的信息，例如语音或音乐。通过根据消息信号的幅度变化载波波的幅度，我们创建了一个可以通过空气传输的调制波。幅度调制的一个主要优点是其简单性。用于AM传输和接收所需的设备相对简单，使得商业广播者和爱好者都能轻松使用。此外，AM信号可以传播很远的距离，特别是在较低频率下，这就是为什么它们经常用于长距离通信。然而，幅度调制也并非没有缺点。一个显著的缺点是其易受噪声和干扰的影响。因为信息是编码在信号的幅度中，所以由于环境因素（例如电气风暴或物理障碍）引起的任何波动都可能会扭曲信息。这就是为什么FM（频率调制）在音乐广播中变得更流行，因为它提供了更好的音质和抗干扰能力。尽管面临这些挑战，幅度调制仍然是通信领域的重要组成部分。许多AM广播电台继续运营，为世界各地的听众提供新闻、脱口秀和其他节目。此外，幅度调制的原理也影响了无线电之外的各种技术，包括电视广播甚至某些形式的数据传输。总之，幅度调制是电子通信领域的一项基础技术。它在长距离传输信息方面的能力使其成为广播历史上的重要工具。虽然新技术可能在音质和抗干扰能力方面提供优势，但理解幅度调制的原理对于掌握通信系统的发展至关重要。随着技术的不断进步，幅度调制的遗产无疑将继续在我们如何连接和分享全球信息的故事中占据重要章节。