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Subtracting regularly repeating sounds

Dear all,

I wonder if anyone has successfully removed the sound of a helium pump from auditory recordings made in an MRI scanner. It occurs regularly (every 1s), and changes over time (Praat thinks it is a formant with downward trajectory). Any advice is appreciated on subtracting regularly repeating sounds would be appreciated.

With thanks,

Kyle Jasmin
Speech Communication Laboratory, UCL Institute of Cognitive Neuroscience
& Laboratory of Brain and Cognition, National Institute of Mental Health