group delay

简明释义

群时延

英英释义

例句

1.Engineers must consider the group delay 群延迟 when designing high-speed communication systems.

工程师在设计高速通信系统时必须考虑 群延迟 group delay 。

2.The group delay 群延迟 variation can lead to distortion in audio signals.

群延迟 group delay 的变化可能导致音频信号失真。

3.Measuring the group delay 群延迟 of a transmission line helps in understanding its performance.

测量传输线的 群延迟 group delay 有助于理解其性能。

4.In optical fibers, the group delay 群延迟 can affect the signal quality over long distances.

在光纤中，群延迟 group delay 可能会影响长距离信号的质量。

5.The group delay 群延迟 in a filter can determine its effectiveness in signal processing.

滤波器中的 群延迟 group delay 可以决定其在信号处理中的有效性。

作文

In the realm of signal processing and telecommunications, understanding various concepts is crucial for engineers and researchers. One such concept that plays a significant role in these fields is group delay. 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. This phenomenon is particularly important when dealing with signals that contain multiple frequency components, as different frequencies can experience different delays, leading to distortion. The significance of group delay lies in its ability to provide insights into how a system affects the transmission of signals, particularly in systems where phase shifts are present.To better understand group delay, it is essential to consider its relationship with phase delay. Phase delay is the time shift of a single frequency component of a signal, while group delay measures the delay of the entire signal's envelope. Mathematically, group delay can be expressed as the negative derivative of the phase response of a system with respect to angular frequency. This relationship highlights that group delay is not a constant value; rather, it varies with frequency, which can lead to significant implications in real-world applications.One of the critical areas where group delay is of utmost importance is in telecommunications, especially in the design of filters and communication systems. For instance, in digital communications, signals are often modulated using techniques such as amplitude modulation (AM) or frequency modulation (FM). If the group delay of a system is not uniform across the frequency spectrum, it can result in intersymbol interference (ISI), where symbols overlap and cause errors in data interpretation. To mitigate this issue, engineers strive to design systems with linear group delay, ensuring that all frequency components of a signal are delayed by the same amount of time, thus preserving the integrity of the transmitted information.Moreover, group delay is also crucial in the field of audio processing. In audio systems, maintaining the phase relationships between different frequency components is vital for achieving high sound quality. If certain frequencies are delayed more than others, it can lead to an unnatural sound, affecting the listening experience. Therefore, audio engineers must pay close attention to the group delay characteristics of their systems to ensure that the final output remains faithful to the original recording.In conclusion, the concept of group delay is fundamental in various fields, including telecommunications and audio processing. Understanding group delay allows engineers to design systems that minimize distortion and maintain signal integrity, ultimately leading to improved performance and user satisfaction. As technology continues to advance, the importance of mastering concepts like group delay will only grow, making it essential for professionals in these fields to remain informed and adept at applying this knowledge effectively.

在信号处理和电信领域，理解各种概念对工程师和研究人员至关重要。其中一个在这些领域中发挥重要作用的概念是群延迟。术语群延迟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。这种现象在处理包含多个频率成分的信号时尤为重要，因为不同频率可能会经历不同的延迟，从而导致失真。群延迟的重要性在于它能够提供有关系统如何影响信号传输的洞察，特别是在存在相位偏移的系统中。为了更好地理解群延迟，有必要考虑它与相位延迟之间的关系。相位延迟是信号单个频率成分的时间偏移，而群延迟则测量整个信号包络的延迟。从数学上讲，群延迟可以表示为系统相位响应对角频率的负导数。这一关系突显了群延迟不是一个恒定值；相反，它随频率变化，这可能在实际应用中产生重大影响。群延迟至关重要的关键领域之一是电信，特别是在滤波器和通信系统的设计中。例如，在数字通信中，信号通常采用幅度调制（AM）或频率调制（FM）等技术进行调制。如果系统的群延迟在频谱上不是均匀的，可能会导致符号间干扰（ISI），即符号重叠并导致数据解释错误。为了减轻这个问题，工程师努力设计具有线性群延迟的系统，确保信号的所有频率成分都被延迟相同的时间，从而保持传输信息的完整性。此外，群延迟在音频处理领域也至关重要。在音频系统中，保持不同频率成分之间的相位关系对于实现高音质至关重要。如果某些频率的延迟超过其他频率，可能会导致不自然的声音，影响听觉体验。因此，音频工程师必须密切关注其系统的群延迟特性，以确保最终输出忠实于原始录音。总之，群延迟的概念在电信和音频处理等多个领域中是基础的。理解群延迟使工程师能够设计出最小化失真并保持信号完整性的系统，最终提高性能和用户满意度。随着技术的不断进步，掌握像群延迟这样的概念的重要性只会增加，因此在这些领域的专业人士必须保持信息灵通，熟练有效地应用这些知识。