Huazhong
University of Science and Technology
Visual
Sound Instrument (Version 3.2)
Signal Menu
a). Digital
Filtering
This function filter signal by the
digital filter designed by Filter Design. Below
is a square signal and its filtered signal by a low pass filter.
.
b).Envelop
Filtering
This function extract envelop of
the signal by a band pass digital filter designed by Filter
Design.. The center frequency of band pass filter is equal to frequency
of carrier wave. Below is a beat wave and its envelop.
c).Filter
Design
Design the filter used by Digital
Filtering and Envelop Filtering. As
shown below.
Filter Order: 1 < this <20
Fl(Low cut frequency): 0 < Fl < Fh
Fh(High cut frequency): Fl < Fh < 0.5
.
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.
2004.1.10