Cambridge Audio Upsampling Digital to Analog Converter azur DacMagic User Manual page 23

azur DacMagic
Our Steep filter is a linear phase filter that has been optimised for stop band attenuation of close-in
aliasing images. Here we have traded a little attenuation of the very highest frequency response (-2dB
at 20kHz) and a little more pre- and post-ringing for a very steep attenuation just outside the pass
band. The Steep filter is able to attenuate aliasing at 22kHz by some 80dB.
Impulse response
0
0 20 40 60 80 100 120 140 160 180
All filters exhibit the same ultimate roll-off of approximately 140dB.
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