Adobe 22011292 User Guide - Page 173

ADOBE AUDITION 159 User Guide Scientific Filter dialog The four most common types of higher order filters are available: Bessel, Butterworth, Chebychev 1, and Chebychev 2. Each one has different characteristics for how steep the transition bands are (at the cutoff points), and how much the filter attenuates. Butterworth is generally the best compromise between quality and desired precision. Each filter is visualized on the Scientific Filters graph, with one line showing frequency response (measured in dB) and the other displaying either phase (measured in degrees) or group delay (measured in milliseconds), depending on whether the Phase or Delay option is selected. Increase the graph's display range by checking the Extended Range box. Note: Some of the following functions are common to all four types of Scientific Filters, while others apply to just certain filters. Low Pass This setting passes the low frequencies while rejecting (or removing) high frequencies. You must specify a cutoff point in order to determine the starting point at which the frequencies will be passed or rejected. High Pass This setting passes high frequencies and removes low frequencies. You must specify a cutoff point in order to determine the starting point at which the frequencies will be passed or rejected. Band Pass This mode preserves a range of frequencies (that is, a band) while removing all other frequencies. You must specify two cutoff points to define the edges of the band. Band Stop Also known as a notch filter, Band Stop is the opposite of Band Pass, and will reject any frequencies within the specified range. You must specify two cutoff points to define the edges of the band.