pulse code mudulation

简明释义

脉码调制

英英释义

例句

1.Many digital communication systems rely on pulse code modulation for transmitting voice signals.

许多数字通信系统依赖于脉冲编码调制来传输语音信号。

2.In video conferencing, pulse code modulation helps maintain clear audio.

在视频会议中，脉冲编码调制有助于保持清晰的音频。

3.During our project, we implemented pulse code modulation for better sound fidelity.

在我们的项目中，我们实施了脉冲编码调制以获得更好的音质保真度。

4.The pulse code modulation technique is widely used in digital audio broadcasting.

脉冲编码调制技术广泛应用于数字音频广播。

5.The audio quality of the recording improved significantly after switching to pulse code modulation.

在切换到脉冲编码调制后，录音的音质显著提高。

作文

In the realm of digital communication, one of the most significant advancements has been the development of techniques that allow for the efficient transmission of audio signals. Among these techniques, pulse code modulation plays a pivotal role. 脉冲编码调制 is a method used to digitally represent analog signals. It involves sampling the amplitude of an analog signal at regular intervals and converting these samples into a binary form that can be easily processed by digital systems.The process of pulse code modulation begins with the sampling of the analog signal. This means that the continuous waveform of the signal is measured at discrete intervals. The Nyquist theorem states that in order to accurately capture an analog signal, it must be sampled at least twice its highest frequency. This principle ensures that the digital representation retains the essential characteristics of the original signal.Once the signal is sampled, the next step in pulse code modulation is quantization. During quantization, each sampled value is approximated to the nearest value within a predefined set of levels. This process introduces a certain degree of error known as quantization noise, but it is a necessary step to convert the sampled values into a format suitable for digital transmission.After quantization, the final stage of pulse code modulation involves encoding the quantized values into binary format. Each level of quantization corresponds to a unique binary code. For instance, if a signal is quantized into eight levels, it would require three bits to represent each level (since 2^3 = 8). This binary representation allows the signal to be transmitted over digital communication channels, such as telephone lines or fiber optics.One of the advantages of using pulse code modulation is its robustness against noise. Since the information is encoded in a binary format, it can be easily regenerated at the receiving end, even if some degradation occurs during transmission. This makes 脉冲编码调制 particularly suitable for long-distance communication where signal quality may be compromised.Furthermore, pulse code modulation is integral to various applications, including digital telephony, audio recording, and video compression. In digital telephony, for example, voice signals are converted into digital data using 脉冲编码调制, allowing for clearer and more reliable communication. Similarly, in audio recording, musicians utilize this technique to ensure high-fidelity sound reproduction.In conclusion, pulse code modulation is a fundamental concept in the field of digital signal processing. Its ability to transform analog signals into a digital format has revolutionized how we communicate and store audio information. By understanding the principles behind 脉冲编码调制, we gain insight into the technological advancements that shape our modern world. As technology continues to evolve, the importance of pulse code modulation will undoubtedly remain significant, paving the way for innovations in audio and communication systems.

在数字通信领域，最重要的进展之一是开发出能够有效传输音频信号的技术。在这些技术中，脉冲编码调制发挥着关键作用。脉冲编码调制是一种用于数字表示模拟信号的方法。它涉及在规则的时间间隔内对模拟信号的幅度进行采样，并将这些样本转换为可以被数字系统轻松处理的二进制形式。脉冲编码调制的过程始于对模拟信号的采样。这意味着对信号的连续波形在离散的时间间隔内进行测量。奈奎斯特定理指出，为了准确捕捉模拟信号，它必须以至少其最高频率的两倍进行采样。这个原则确保数字表示保留原始信号的基本特征。一旦信号被采样，脉冲编码调制的下一步是量化。在量化过程中，每个采样值被近似为预定义水平集中的最近值。这个过程引入了一定程度的误差，称为量化噪声，但这是将采样值转换为适合数字传输格式所必需的步骤。量化完成后，脉冲编码调制的最后阶段涉及将量化值编码为二进制格式。每个量化水平对应一个唯一的二进制代码。例如，如果信号被量化为八个水平，则需要三个比特来表示每个水平（因为2^3 = 8）。这种二进制表示法使得信号能够通过数字通信通道进行传输，如电话线或光纤。使用脉冲编码调制的一个优点是其对噪声的鲁棒性。由于信息以二进制格式编码，即使在传输过程中发生某些退化，也可以在接收端轻松再生。这使得脉冲编码调制特别适合长距离通信，因为信号质量可能会受到影响。此外，脉冲编码调制在各种应用中至关重要，包括数字电话、音频录制和视频压缩。在数字电话中，例如，语音信号通过脉冲编码调制转换为数字数据，从而实现更清晰、更可靠的通信。同样，在音频录制中，音乐家利用这种技术确保高保真声音的再现。总之，脉冲编码调制是数字信号处理领域的一个基本概念。它将模拟信号转变为数字格式的能力彻底改变了我们交流和存储音频信息的方式。通过理解脉冲编码调制背后的原理，我们可以深入了解塑造我们现代世界的技术进步。随着技术的不断发展，脉冲编码调制的重要性无疑仍将显著，为音频和通信系统的创新铺平道路。