group delay

简明释义

群延迟

英英释义

例句

1.In radar systems, the group delay affects the accuracy of target detection.

在雷达系统中，群延迟会影响目标检测的准确性。

2.The group delay of a filter determines how different frequencies are delayed.

滤波器的群延迟决定了不同频率的延迟程度。

3.A high group delay can indicate potential issues in a circuit design.

高群延迟可能表明电路设计中的潜在问题。

4.Engineers often analyze the group delay to optimize the performance of communication systems.

工程师们经常分析群延迟以优化通信系统的性能。

5.The measurement of the group delay in the optical fiber is crucial for ensuring signal integrity.

在光纤中测量群延迟对于确保信号完整性至关重要。

作文

In the field of signal processing and telecommunications, the term group delay refers to the time delay experienced by the envelope of a modulated signal as it passes through a system or medium. Understanding group delay is crucial for engineers and researchers who work with communication systems, as it directly affects the integrity and quality of transmitted signals. When a signal travels through various components, such as filters or amplifiers, different frequency components may experience different delays. This phenomenon can lead to distortion if not properly managed. To illustrate the importance of group delay, let us consider a simple example involving audio signals. When sound is transmitted over a distance, it is composed of various frequencies that combine to create the final sound we hear. If these frequencies arrive at different times due to varying group delay, the resulting audio can become muddled or incoherent. For instance, if a musical note consists of multiple harmonics, a significant difference in group delay among these harmonics can cause the note to sound out of tune or even unrecognizable. Moreover, group delay is especially important in digital communications, where data is often transmitted in packets. In this context, maintaining synchronization between the different parts of the signal is essential for accurate data retrieval. If the group delay varies significantly across the frequency spectrum, it can lead to intersymbol interference, where one symbol interferes with another, thereby causing errors in data interpretation. Engineers must carefully design systems to minimize variations in group delay, ensuring that all frequency components of a signal are delayed consistently. The mathematical representation of group delay can be derived from the phase response of a system. It is defined as the negative derivative of the phase response with respect to angular frequency. This relationship highlights how changes in frequency can impact the delay experienced by different components of a signal. By analyzing the group delay, engineers can optimize filter designs and other components to achieve the desired performance. In conclusion, group delay is a fundamental concept in signal processing that plays a critical role in the transmission of information. Its implications extend beyond mere technicalities; they affect the overall quality and reliability of communication systems. As technology continues to advance, understanding and managing group delay will remain a key focus for professionals in the field, ensuring that we can transmit data effectively and accurately across various mediums. The ability to control group delay will ultimately lead to better performance in audio, video, and data communications, enhancing our experience in an increasingly connected world.

在信号处理和电信领域，术语group delay指的是调制信号的包络在通过系统或介质时所经历的时间延迟。理解group delay对从事通信系统工作的工程师和研究人员至关重要，因为它直接影响到传输信号的完整性和质量。当信号通过各种组件（如滤波器或放大器）时，不同频率成分可能会经历不同的延迟。这种现象如果管理不当，可能会导致失真。为了说明group delay的重要性，让我们考虑一个简单的关于音频信号的例子。当声音在一段距离上被传输时，它由各种频率组成，这些频率结合在一起形成我们听到的最终声音。如果由于不同的group delay，这些频率以不同的时间到达，最终的音频可能会变得模糊或不连贯。例如，如果一个音乐音符由多个谐波组成，这些谐波之间存在显著的group delay差异，可能导致音符听起来走音，甚至无法识别。此外，在数字通信中，group delay尤其重要，因为数据通常以数据包的形式传输。在这种情况下，保持信号不同部分之间的同步对于准确的数据检索至关重要。如果group delay在频谱中变化显著，可能会导致符号间干扰，即一个符号干扰另一个符号，从而导致数据解释中的错误。工程师必须仔细设计系统，以最小化group delay的变化，确保信号的所有频率成分一致地延迟。group delay的数学表示可以从系统的相位响应中推导出来。它被定义为相位响应对角频率的负导数。这种关系突显了频率变化如何影响信号不同成分所经历的延迟。通过分析group delay，工程师可以优化滤波器设计和其他组件，以实现所需的性能。总之，group delay是信号处理中的一个基本概念，在信息传输中起着关键作用。它的影响超出了单纯的技术细节；它们影响着通信系统的整体质量和可靠性。随着技术的不断进步，理解和管理group delay将始终是该领域专业人士的重点，确保我们能够有效、准确地通过各种介质传输数据。控制group delay的能力最终将促进音频、视频和数据通信的更好性能，提升我们在日益互联的世界中的体验。