Multi-channel pulse height analysis techniques are developing in the direction of digitalization. Based on digital signal processing techniques

digital multi-channel analyzers are characterized by powerful pulse processing ability

high throughput

improved stability and flexibility. This paper analyzes key techniques of digital nuclear pulse processing. With MATLAB software

main algorithms are simulated

such as trapezoidal shaping

digital baseline estimation

digital pole-zero / zero-pole compensation

poles and zeros identification. The preliminary general scheme of digital MCA is discussed

as well as some other important techniques about its engineering design. All these lay the foundation of developing homemade digital nuclear spectrometers.