Open Access e-Journal Cardiometry No.16 May 2020
We should mention that Cardiometry is a fine diagnostics tool to assess heart life expectancy. Our experts, using Cardiocode in “red zones” in intensive care units, have confirmed effectiveness of noninvasive measuring of the hemodynamics data on the cardiovascular system performance in critical patients with different severity degrees. The medical staff involved had a possibility not only to monitor the state in each critical patient, but also to predict and control the progression of a disease. We are going to publish some results of this pilot study in our next issues.
We should mention that Cardiometry is a fine diagnostics tool to assess heart life expectancy. Our experts, using Cardiocode in “red zones” in intensive care units, have confirmed effectiveness of noninvasive measuring of the hemodynamics data on the cardiovascular system performance in critical patients with different severity degrees. The medical staff involved had a possibility not only to monitor the state in each critical patient, but also to predict and control the progression of a disease. We are going to publish some results of this pilot study in our next issues.
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tion v[n] using HFF, then the final time inversion (init
TI) reverses the order of the readings sequence. As a
result, the appeared shifts are mutually compensated.
Similarly implemented is the bi-directional cascade
of wide-band reject filters, the diagram of which
is presented in Figure 2 herein.
In case of the bi-directional implementation of a
wide-band RF cascade, it differs considerably from
the bi-directional implementation of HFF. There is a
need for a double implementation of each cascade of
the wide-band RF. In the present diagram, noise-laden
signal x[n] is processed with the wide-band RF of the
first sequence for suppression of noises and separation
of signal s1[n] at the filter output, and then the processed
signal is delivered to the input of the wide-band
RF second sequence to suppress the residual noise and
separate the clean signal s2[n]. In Figure 2 herein, the
wide-band RF of the second order is designated as "filter
1” and that of fourth order as "filter 2".
Convolution of the bi-directional HFF implementation
in the frequency domain is represented in formula
(10), and the wide-band RF cascade in formula (11).
W () s =
s
1 2
2
s + 2,094
+ 0, 463s+
2,094
− +
− 0,5427z+
0,7362
2
0,8681z
0,5427z
0,8681
1( ) =
2
W z
z
4 2
s + 4,189s
+ 4,388
W2 () s =
4 3 2
s + 0,926s + 4, 404s + 1,940s+
4,388
W
z − z + z − z+
z − 1,085z + 1,767z − 0,799z+
0,542
4 3 2
0,7536 0,9422 1,802 0,9422 0,7536
2( z)
=
4 3 2
6 4 2
s + 6,284s + 13,166s
+ 9,194
W3 () s =
6 5 4 3 2
s + 1,389s + 6,928s + 5,919s + 14,513s + 6,096s+
9,194
z − z + z − z + z − z−
z − 1,628z + 3,092z − 2,557z + 2, 277z − 0,8825z+
0,399
6 5 4 3 2
0,6542 1, 277 2,73 2,614 2,73 1, 277 0,6542
3( ) =
6 5 4 3 2
W z
W () s =
s
1 2
2
s + 2,094
+ 0,463s+
2,094
2
0,8681z
− 0,5427z+
0,8681
1( ) =
2
W z
z
− 0,5427z+
0,7362
4 2
s + 4,189s
+ 4,388
W2 () s =
4 3 2
s + 0,654s + 4,404s + 1,371s+
4,388
W
4 3 2
0,8078z − 1,01z + 1,931z − 1,01z+
0,8078
2( z)
=
4 3 2
z − 1,118z + 1,894z − 0,9015z+
0,6529
6 4 2
s + 6,284s + 13,166s
+ 9,194
W3 () s =
6 5 4 3 2
s + 1,117s + 6,802s + 4,782s + 14, 250s + 4,905s+
9,194
6 5 4 3 2
0,7012z − 1,315z + 2,926z − 2,802z + 2,926z −1,315z−0,7012
3( ) =
6 5 4 3 2
W z
z − 1,661z + 3,237z − 2,753z + 2,536z − 1,018z+
0, 4806
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Issue 16. May 2020 | Cardiometry | 89
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