Digital Signal Processing Reference
In-Depth Information
−20
−40
−60
−80
−100
−120
60
0
40
1000
2000
20
3000
0
4000
Frequency, Hz
Frame (Min Mag Frames)
Figure 3.59:
Bin magnitude versus Frequency and Frame for the low-magnitude frame matrix
(
minF rameMat
). The low-amplitude, steady-state sinusoid at 1000 Hz is readily discernible in the
low-energy frames of the signal. Note also an apparent steady-state sinusoid around 60 Hz; this is present
in the original audio file.
% Computes the dft of TestSig, then computes
%
the IDF T two ways, using formulas (see text)
%
for the IDF T that assume bins +k and -k are
%
complex conjugates of each other.TestSig is also
%
reconstructed via standard IDF T using the
% function ifft, and a figure with three plots is
%
generated, the first plot showing TestSig, the
%
second one showing the reconstruction via
% the text formula(s), and the third is TestSig
%
reconstructed via the function ifft.
% Test calls:
% LVxIDF TviaPosK(ones(1,8))
% LVxIDF TviaPosK(ones(1,9))
% LVxIDF TviaPosK(randn(1,9))
%
LVxIDF TviaPosK(j*randn(1,9))
33. Write the m-code for the script
LV xDF T Equalization(tstSig, p, k, SR, xplotlim)
as described in the text and according to the following function specification:
