Creating Band-passed noise stimuli (Fatima Husain )

Subject: Creating Band-passed noise stimuli
From:    Fatima Husain  <fhusain(at)CNS.BU.EDU>
Date:    Thu, 5 Jun 1997 16:48:25 -0400

Hi All, This is the first time I am addressing the List. I am in the process of creating stimuli which are white noise bandpassed through a filter. Basically I need a series of complex stimuli centerd at different frequencies. I tried harmonic complexes but found they can show beat and/or timbre effects which i could not control for. I need the stimuli to change in a more or less orderly manner, i.e. an individual shouldn't stand out from its neighbors (except for the change of freq./pitch effects). I have now settled for white noise bandpassed through say a butterworth filter. I am worried about two things : (a) choice of filter - is some other filter a better choice? (b) is there a better way of generating such stimuli rather than using bandpassed white noise? Btw, I use a random number generator to generate white noise and then low pass at 2 different freq.s. The difference is the bandpass stimulus. Any input is appreciated. Regards, --fatima =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Fatima Husain Dept. of Cognitive and Neural Systems fhusain(at) Boston University =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

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