Bandpassing refers to the process of filtering out certain frequencies from a signal. When it comes to synonyms for this term, one might consider using alternatives such as filtering, sieving, screening, or sieving out frequencies. These alternatives all carry a similar meaning to bandpassing, in that they refer to the removal or isolation of specific frequency ranges within a given signal. Other synonyms that may be applicable include blocking, isolating, or segmenting depending on the specific context in which the term is being used. Regardless of the exact word chosen, these synonyms all serve to convey the idea of filtering or manipulating a signal to isolate or enhance specific components.