amplitude modulation

简明释义

振幅灯

英英释义

例句

1.The quality of sound in amplitude modulation can be affected by interference.

幅度调制中的声音质量可能会受到干扰的影响。

2.Many AM radios rely on amplitude modulation for their audio transmission.

许多AM收音机依赖于幅度调制进行音频传输。

3.Engineers often compare amplitude modulation with frequency modulation to determine which is better for a given application.

工程师们经常比较幅度调制和频率调制，以确定哪种更适合特定应用。

4.The radio station uses amplitude modulation to broadcast its signal over long distances.

这个电台使用幅度调制将信号广播到远距离。

5.In amplitude modulation, the amplitude of the carrier wave varies with the information signal.

幅度调制中，载波的幅度随着信息信号的变化而变化。

作文

Amplitude modulation (AM) is a technique used in electronic communication, most commonly for transmitting information via a radio carrier wave. The concept of amplitude modulation refers to the process of varying the strength (amplitude) of the carrier wave in relation to the information signal being sent. This method of modulation is crucial because it allows audio signals, such as music or voice, to be transmitted over long distances without significant loss of quality. To understand amplitude modulation, it's important to first grasp how sound waves work. Sound waves are mechanical vibrations that travel through the air (or another medium) and can be represented as waveforms. These waveforms have various properties, including frequency, wavelength, and amplitude. The frequency determines the pitch of the sound, while the amplitude relates to the loudness. In amplitude modulation, we manipulate the amplitude of the carrier wave to encode the information signal.In practical terms, when an audio signal is input into a transmitter, it modulates the amplitude of a higher frequency carrier wave. This modulation results in a new wave that carries the original audio information. At the receiving end, a radio receiver detects the modulated wave and demodulates it to retrieve the original audio signal. This process is essential for AM radio broadcasting, where multiple stations can transmit simultaneously on different frequencies.One of the key advantages of amplitude modulation is its simplicity. The technology required for AM transmission and reception is relatively straightforward, making it accessible for widespread use. Additionally, AM signals can travel long distances, especially at lower frequencies, which is why AM radio stations can often be heard far from their broadcast location. However, there are also disadvantages to this method. AM signals are more susceptible to noise and interference compared to other modulation techniques, such as frequency modulation (FM). This can result in decreased sound quality, particularly in urban areas with high levels of electromagnetic interference.Despite these drawbacks, amplitude modulation remains a fundamental part of our communication infrastructure. It is not only utilized in AM radio but also in aviation communications, where pilots and air traffic controllers rely on AM for clear voice transmissions. Furthermore, amplitude modulation plays a role in television broadcasting and in some forms of data transmission.In conclusion, amplitude modulation is a vital technique in the field of communication that has stood the test of time. Its ability to effectively transmit audio signals over vast distances, combined with its relative simplicity, ensures its continued relevance in various applications. Understanding amplitude modulation provides insight into the mechanics of radio communication and highlights the importance of modulation techniques in our daily lives. As technology advances, it will be interesting to see how amplitude modulation evolves and adapts to new communication needs, but its foundational principles will likely remain integral to the way we transmit information for years to come.

幅度调制（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。幅度调制的概念是指在发送的信息信号与载波波的强度（幅度）之间变化的过程。这种调制方法至关重要，因为它允许音频信号（如音乐或语音）在长距离上传输而不会显著损失质量。要理解幅度调制，首先要掌握声波的工作原理。声波是通过空气（或其他介质）传播的机械振动，可以表示为波形。这些波形具有各种属性，包括频率、波长和幅度。频率决定声音的音调，而幅度与响度相关。在幅度调制中，我们操纵载波波的幅度来编码信息信号。在实际操作中，当音频信号输入到发射器时，它会调制更高频率载波波的幅度。这种调制产生了一种新的波，携带原始音频信息。在接收端，无线电接收器检测调制波并对其进行解调，以检索原始音频信号。这一过程对于AM广播至关重要，在AM广播中，多个电台可以在不同频率上同时传输。幅度调制的一个主要优点是其简单性。AM传输和接收所需的技术相对简单，使其易于广泛使用。此外，AM信号可以远距离传播，特别是在较低频率下，这就是为什么AM电台通常可以在远离其广播位置的地方被听到。然而，这种方法也有缺点。与其他调制技术（如频率调制FM）相比，AM信号更容易受到噪声和干扰的影响。这可能导致音质下降，特别是在电磁干扰较高的城市地区。尽管存在这些缺点，幅度调制仍然是我们通信基础设施的重要组成部分。它不仅用于AM广播电台，还用于航空通信，飞行员和空中交通管制员依赖AM进行清晰的语音传输。此外，幅度调制还在电视广播和某些数据传输形式中发挥作用。总之，幅度调制是通信领域中的一项重要技术，经历了时间的考验。它有效地在广阔的距离上传输音频信号的能力，加上其相对简单性，确保了它在各种应用中的持续相关性。理解幅度调制提供了对无线电通信机制的深入了解，并突出了调制技术在我们日常生活中的重要性。随着技术的发展，观察幅度调制如何演变和适应新的通信需求将是有趣的，但其基础原则可能在未来几年内仍将是我们传输信息方式的核心。