Abstract: [Background] The noise suppression, pile-up identification and amplitude extraction of the pulse signal are affected by the choice of digital shaping method and parameters in the digital nuclear spectrometer system, which directly affect the system's energy resolution and maximum pulse count rate.[Purpose] We developed a digital signal processing platform based on MATLAB to build multiple digital shaping algorithm verification platforms and implement nuclear pulse signal processing.[Methods] The simulation nuclear signals and the sampled signals can be achieved separately to Gaussian, trapezoidal and triangular shapes in different digital shaping methods and different shaping parameters, and then completed pile-up identification, baseline estimation and amplitude extraction.[Results] The γ-ray energy spectrum of ¹³⁷Cs (NaI detector) and X-ray energy spectrum of Fe source (Si-PIN detector) are obtained respectively in different digital shaping methods and different shaping parameters.[Conclusion] The digital gaussian shaping shows better energy resolution characteristics, triangular shaping shows better maximum pulse count rate characteristics, and trapezoidal shaping shows better overall characteristics. Trapezoidal shaping is used to obtain the ¹³⁷Cs energy spectrum and the Gaussian shaping is used to obtain the Fe energy spectrum, which shows that as the shaping parameters increase, the energy resolution is better and the maximum pulse count rate is lower.

Key words: Nuclear pulse signal, Digital shaping, MATLAB, Energy resolution