PCM Encoding Examples

Here we provide a comprehensive demonstration of PCM encoding implementations. PCM encoding is a fundamental digital signal processing technique that encompasses uniform quantization encoding, non-uniform quantization encoding, and A-law PCM encoding. Uniform quantization encoding divides the amplitude of analog signals into equal intervals, with each quantization level represented by binary code words. In code implementation, this typically involves scaling input signals to match the quantization range and applying rounding or truncation operations. Non-uniform quantization encoding employs unequal quantization intervals that adapt to signal amplitude characteristics, often implemented using companding techniques where signals undergo logarithmic compression before uniform quantization. Finally, A-law PCM encoding utilizes variable word length encoding for analog signal quantization, achieving higher signal-to-noise ratio through piecewise linear approximation of logarithmic compression curves. In practical implementations, A-law encoding commonly uses 13-segment approximation with 8-bit codewords. From a programming perspective, these encoding schemes can be implemented using lookup tables for quantization levels or real-time calculation of compression characteristics. In summary, PCM encoding serves as a crucial digital signal processing technology with broad applications across telecommunications, audio processing, and data acquisition systems.