During March 2025, Sohn focused on stabilizing digital signal processing in the simonsobs/sotodlib repository by addressing a critical filter design issue. He replaced the Butter4 bandwidth filter with a sine-squared filter for both band-pass and low-pass operations, using Python to implement the new approach. This change improved the accuracy and reliability of filtering across DSP pipelines, reducing discrepancies in edge cases. Sohn also updated docstrings and usage examples to clarify the new filter’s behavior, supporting better developer onboarding. His work demonstrated depth in signal processing and filter design, contributing to more robust and maintainable data processing within the project.