Background: Histogram statistics method and average value method are widely used to obtain the baseline of nuclear signal processing. However

there still exist several shortcomings

such as low accuracy

weak real-time character and high hardware resource occupancy. Purpose: This study aims to improve the accuracy and the real-time performance of the baseline extraction for the digital nuclear instruments. Methods: A novel method of obtaining baseline is proposed

it is a real-time dynamic average method that can be easily implemented on a Field-Programmable Gate Array (FPGA) based multi-channel pulse height analyzer. By setting appropiate parameters

the accuracy and real-time character could be obviously improved. Results: This novel method not only occupies less hardware resource

but also achieves higher accuracy. The energy resolution of 137Cs spectrum is got improved to 7.44%. Conclusion: This method can be applied to extract baseline of digital multi-channel pulse height analyzer with high accuracy and real-time response. Abstract