"深入理解PCM编码原理及优势——数字信号传输技术简介"

PCM (Pulse Code Modulation) is a fundamental method used in digital communication to transmit signals in the form of digital data. With the advancement of microelectronics and computer technology, the advantages of digital transmission have become increasingly apparent. Digital communication offers strong resistance to interference, minimal distortion, stable transmission characteristics, noise immunity over long distances, and efficient encoding, decoding, and encryption capabilities to enhance the effectiveness, reliability, and security of communication systems. Additionally, digital communication allows for storage, time-scale transformation, complex computation processing, among other functionalities. Analog-to-digital conversion falls within the scope of source coding, which includes processes such as parallel/serial conversion, encryption, and data compression. This paper focuses on discussing the basic method of analog signal digitization - Pulse Code Modulation. The process of analog signal digitization, which involves sampling, quantization, and encoding, is essential for obtaining digital signals. This study provides a brief introduction to PCM (Pulse Code Modulation) and elaborates on the principles of PCM coding. It delves into the various stages of PCM, such as baseband sampling, bandpass sampling, 13-segment quantization, PCM encoding, and PCM decoding, providing detailed explanations for each process. Furthermore, simulations of these processes were conducted using MATLAB 7.0, comparing the results of uniform quantization and non-uniform quantization for speech signals. The findings suggest that non-uniform quantization has advantages over uniform quantization. This study sheds light on the importance of PCM in digital communication and highlights the significance of efficient signal processing techniques for enhancing communication systems. Keywords: Pulse Code Modulation, Sampling, Non-uniform Quantization, Encoding, Decoding.