Novel method to find the parameter for noise removal from multi channel ecg waveforms

IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308
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Volume: 03 Issue: 02 | Feb-2014, Available @ http://www.ijret.org 395
NOVEL METHOD TO FIND THE PARAMETER FOR NOISE REMOVAL
FROM MULTI-CHANNEL ECG WAVEFORMS
Menta Srinivasulu1
, K. Chennakeshava Reddy2
1
Professor and HOD ECE Dept. LITS, Khammam, AP, India
2
Principal, BIET, Ibrahimpatnam, AP, India
Abstract
In general, electrocardiogram (ECG) waveforms are affected by noise and artifacts and it is essential to remove the noise in order to
support any decision making for specialist. It is very difficult to remove the noise from 12 channel ECG waveforms using standard
noise removal methodologies. Removal of the noise from ECG waveforms is majorly classified into two types in signal processing
namely Digital filters and Analog filters. Digital filters are more accurate than analog filters because analog filters introduce
nonlinear phase shift. Most advanced research digital filters are FIR and IIR.FIR filters are stable as they have non-recursive
structure. They give the exact linear phase and efficiently realizable in hardware. The filter response is finite duration. Thus noise
removal using FIR digital filter is better option in comparison with IIR digital filter. But it is very difficult to find the cut-off frequency
parameter for dynamic multi-channel ECG waveforms using existing traditional methods.
So, in this research, newly introduced Multi-Swarm Optimization (MSO) methodology for automatically identifying the cut-off
frequency parameter of multichannel ECG waveforms for low-pass filtering is inspecting. Generally, the spectrums of the ECG
waveforms are extracted from four classes: normal sinus rhythm, atria fibrillation, arrhythmia and supraventricular. Baseline wander
is removed using the Moving Median Filter. A dataset of the extracted features of the ECG spectrums is used to train the MSO. The
performance of the MSO with various parameters is investigated. Finally, the MSO-identified cut-off frequency parameter, it’s applied
to a Finite Impulse Response (FIR) filter. The resulting signal is evaluated against the original clean and conventional filtered ECG
signal.
Keywords: 12 Channel ECG Waveforms, Multi Swarm Optimization Neural Network, Low-pass filtering, Finite Impulse
Response (FIR).
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1. INTRODUCTION
The measurement of the electrical activity of the heart (cardiac)
muscle is called electrocardiogram (ECG). As the heart
performs its function of pumping blood through the circulatory
system, the result of the mechanical events within the heart is
the generation of a certain sequence of electrical events [1]. The
ECG waveform consists of P wave, QRS wave, T wave and U
Wave. Basic unit of the ECG waveform is shown below figure
1.
Nowadays, most of the health care and cardio centres are using
the most advanced ECG equipment like 12 Channel/Lead ECG.
The 12-Channel ECG provides the most thorough ability to
interpret electrical activity within the heart compare with
standard ECG Waveforms. In a 12-Channel ECG, an electrode
is placed on each upper arm and lower leg to monitor the
standard Channels (I, II, and III) and augmented leads (aVR,
aVL, and aVF) along the frontal plane. In addition, chest leads
may be used to evaluate the horizontal plane of electrical
activity through assessment of V1 to V6. Most ECG devices are
configured with computer systems and analysis the ECG
waveforms. 12 channel ECG waveforms are shown below
figure2.
Fig 1 Basic unit of the ECG waveform
Figure 2 shows 4 rows and each row contains 3 channels. For
computerized interpretation system and for human electro

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cardiographer, it is vital to access accurate measurements of
ECG intervals and critical points (e.g. P, QRS, and T). Basic
intervals are showing below figure 3.
Fig 2 12-Channel ECG waveform
Fig 3 Basic intervals
The morphology of ECG waveform has been used for
recognizing heart activity. Therefore, it is very important to
obtain the parameters of clear ECG waveforms without noise
[2-3]. ECG provides valuable information to diagnose heart
disorders and the ischemic changes that may occur, such as the
myocardial infarction, conduction defects and arrhythmia [3].
Therefore, the ECG waveform must be clearly represented and
filtered to remove all distracting noise and artifacts.
The ECG waveform is usually corrupted with noise from
various sources including imperfect contact of electrodes to the
body, machine malfunction and electrical noise from elsewhere
in the body, respiration and muscle contractions [5]. The
produced noise consists of low-frequency components that
cause baseline wander and high-frequency components such as
power-line interference [3]. ECG noise removal is complicated
due to the time varying nature of ECG waveforms. In noise
removal, it is necessary to identify the cut-off frequency
parameter of the filter. However, this is difficult to determine
and improper treatment may introduce additional artifacts to the
signal especially on the QRS wave.
Although there are many new methods for noise removal, most
noise removal systems for ECG waveforms use the band pass
filter because of simplicity in implementation and requiring
minimal coefficients [2-6]. The important consideration of this
popular technique is in automatically identifying the correct
pass bands in the frequency spectrum using the intelligent
methods. The intelligent methods are Artificial Neural
Networks (ANN), Swarm Intelligence (SI) and Support Vector
Machine (SVM) etc. The next section provides a brief review
on some recent noise removal methods [7].
Analog filters can also be used to remove these noises, but
nonlinear phase shift is introduced by them. Digital filters are
more accurate and precise than analog filters. Digital filters are
of two kinds- one is Finite Impulse Response (FIR) and second
one is Infinite Impulse Response (IIR). The FIR filters have
more advantages over IIR filters.
An insufficient and incomplete research effort has been
observed in the area of automated calculation of cut-off
frequency parameters for noise removal using filters. Therefore,
the incompleteness in this area has been the motivation factor
to pursue the present research i.e. to find cut-off frequency
parameter using FIR filter with MSO methodology. Earlier
application of PSO in training the ANN to identify the optimal
cut-off frequency parameter for removal of the high frequency
noise in ECG signals with FIR filter is used. In this study, FIR
filter is preferred to compare with IIR filter and is more
susceptible to problems of finite-length arithmetic [7-10].
Additionally, FIR filters are less complex and can be readily
applied to ECG waveforms. Above mentioned knowledge is not
sufficient for noise removal in multi-channel ECG waveforms.
So this paper proposes the new methodology for removal of
noise in multi-channel ECG waveform. One of the weaknesses
of regular particle swarm optimization (PSO) is that results
depend to a large extent on the starting position of the particles.
Multi-swarm optimization (MSO) uses several swarms of
particles rather than a single swarm. A collection of particles is
called a swarm. This approach helps overcome the sensitivity to
initial positions. MSO is very robust and advanced optimization
algorithm‘s is an extension of PSO. The position of each virtual
particle represents a potential solution and particles iteratively

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move to better positions until some stopping condition is met
[15-19].
2. BACK GROUND
Noise removal from ECG waveforms has been discussed so
many research workers. Most of the research works are ECG
waveform removed noise only for one channel waveform.
Kang-Ming Chang proposed on Ensemble Empirical Mode
decomposition for noise removal process for multi-channel
ECG waveforms. In (2013), Principal Component Regression is
used for remove the approach for maternal ECG removal and
multichannel correlation based fHR detector. Zhang and Sui
[14] proposed a method based on morphological filtering and
wavelets to eliminate the noise in ECG waveforms and increase
the diagnosis efficiency.
In [15], intelligent approach based on moving median filter and
Self-Organizing Map (SOM) neural network is proposed to
identify the cut-off frequency parameter of the noise, which is
to be filtered out and proved results of the proposed scheme are
compared with the low-pass FIR filtering for ECG signal high
frequency noise removal. Poungponsri and Yu (2009) used the
Wavelet Neural Network (WNN) for ECG waveform modelling
and noise reduction. The WNN built combined the multi
resolution nature of wavelets and the adaptive learning ability
of ANN, and was trained by a hybrid algorithm that includes
the Adaptive Diversity Learning Particle Swarm Optimization
(ADLPSO) and the gradient descent optimization.
Previous studies have indicated that the neural network based
methods present effective approaches for denoising ECG
waveforms. There are also some algorithms for optimization of
the ANN itself [7]. And still more need to improve the
performance for multi-channel in dynamic environments.
So, the most recent swarm optimization algorithm is the Multi-
Swarm optimization (MSO) algorithm. This MSO algorithm is
randomly divides initialized particles into several positions. It‘s
identify the cut-off frequency parameter with calculating
certain generations respectively, every position is combined
into one position and continues to calculate until the stop
condition is satisfied. At the same time, the MSO updates the
positions by following multi-gbest and multi-pbest instead of
single gbest and single pbest [18-19].
With regards to filters for noise removal, there is insufficient
research in the area of automated calculation of cut-off
frequency parameter for multi-channel Waveforms. This paper
presents application of MSO in training the ANN to identify the
optimal cut-off frequency parameter for removal of high
frequency noise in ECG signals using an FIR filter.
Additionally, FIR filters are less complex and can be readily
applied to ECG waveforms.
3. PROPOSED METHODOLOGY
Proposed methodology is shown below figure 4.
Fig 4 Flow chart of proposed methodology architecture
Major process divided into four steps:
 The initial step is data preparation, whose details are
explained in the subsequent sections.
 Next followed step is drift noise removal and Feature
Extraction.
 The heart Step for this research is MSO system
configuration, multiple swarms applied to different
MSO positions. It will produce the Cutoff frequency
parameter for filter methods.
 Final Step is applying the cutoff frequency parameter
value in FIR filter method. It gives clean ECG signal
without noise for analysis of ECG further levels.
3.1. Test Data
In this Research, data is collected from three centers:
PTB Diagnostic ECG Database: This database contains 549
records from 290 subjects. Each subject is represented by one
to five records. Each record includes 15 simultaneously
measured signals. Each signal is digitized at 1000 samples per
second, with 16 bit resolution over a range of ± 16.384 mV.
St.-Petersburg Institute of Cardio logical Technics 12-lead
Arrhythmia Database: This database contains 75 twelve-lead
ECGs from 32 Holter records. Each record is 30 minutes long
and contains 12 standard leads, each sampled at 257 Hz, with
gains varying from 250 to 1100 analog-to-digital converter
units per millivolt.
PhysioNet/Computing in Cardiology Challenge 2011: This
database contains 1500 twelve-lead ECGs. These ECGs have
been classified individually with respect to acceptability for
purposes of diagnostic interpretation. One sample data set from
test data of the 12 channel ECG waveforms is shown below
figure 5.

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Fig 5 Sample Data set from test data of the 12 Channel ECG
waveforms
3.2. Removal of Baseline Wander
Baseline wander makes manual and automatic analysis of 12
channel ECG records is very hard, especially in measuring of
the ST segment deviation that is used for diagnostic ischemia.
Baseline wander removal is a filtering need which can be
implemented efficiently in an embedded platform. However,
inaccurate baseline wander removal can cause distortion of
important clinical information, particularly ST segment
distortion, as there are overlaps in the spectrum of the baseline
wander and low frequency components of the ECG signals.
One of the 12 Channels ECG waveforms for baseline wander
removal is presented in below Figure 6. As such, the first step
is the reduction improvement for the removal of baseline
wander. In part of the reduction, select each channel as input of
the filter .One of the channels from Figure 5 is shown in Figure
6 after applying the following equation (1). As part of the
analysis, median filter is known to be more proficient and it is
applied in this work.
B1 = Median Filter(ON.mat, [a b]) ---- (1)
Each output data point contains the median value in the [a b]
subpart of the corresponding data in the input ECG
waveforms. Same equation (1) implemented for all left 11
channels in part of the 12 channel ECG waveforms. Finally, the
baseline wander is eliminated successfully and producing a
virtually zero attenuation of the ECG waveform as shown
below figure 7 for one sample channel from the test data sets.
Fig 6 III Channel ECG waveform from the sample of 12
Channel ECG waveforms
Fig 7: Median filter for figure 6
3.3. Feature Extraction
MSO needs some inputs - derived from 22 features of the test
data sets. Analysis of the ECG waveform, taking into account
minimal complexity in computation, revealed that two common
statistical measures namely standard deviation and variance
would suffice. MSO methodology needs more inputs for each
data set point and in this paper it is included new interval
feature compare with existing research scope. In addition, some
of the standard attributes like mean and median are considered.
Another additional feature is Form Factor (FF). Form factor
(FF) is another technique to represent ECG waveform
complexity in a scalar value. All above features are used to find
the cut-off frequency using MSO methodology. List of the
features is shown below table 1.
Table 1 Extract features descriptions
Feature
No.
Descript
ion
Featur
e No. Description
1 X(R1) 13 X(R2)
2 V(R1) 14 V(R2)
3 X(S) 15 X(R2)-X(R1)
4 V(S) 16 V(R2)-V(R1)
5 X(T) 17 X(S)-X(R1)
6 V(T) 18 X(T)-X(S)
7 X(P) 19 X(P)-X(T)
8 V(P) 20 X(Q)-X(P)
9 X(Q) 21 X(R2)-X(Q)
10 V(Q) 22 Median
11 SD 23 Form Factor
12 Mean 24 Average of intervals
3.4. Multi Swarm Optimization (MSO)
MSO is a technique for estimating the solution to difficult or
impossible numerical problems. It is an alternative of particle
swarm optimization (PSO) based on the use of multiple sub-
swarms instead of one (standard) swarm. The general approach
in multi-swarm optimization is that each sub-swarm focuses on
a specific region while a specific diversification method
decides where and when to launch the sub-swarms. The multi-
swarm framework is especially fitted for the optimization on
multi-modal problems. High level algorithm for MSO is shown
in figure 8.

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Fig 8: High level algorithm for MSO optimization
The particles or inputs of the Multi-swarm optimization are
determined by the features of the dataset. MSO Particles bases
its diversiﬁcation mechanism on the ―collision‖ of particles.
When particles get too close, a repulsive force expels the
particles into new waves/sub-swarms, and this avoids a
complete convergence. A key feature of the new sub-swarms is
that their initial positions are not randomly selected as in
normal swarms. Instead, they maintain some information from
the previous trajectories of the particles. A similar relationship
exists with initial velocities.
This multiswarm system bases its diversiﬁcation mechanism on
a ―devour and move on‖ strategy. Once a sub-swarm has
devoured a region (intensive search) the swarm is ready to
move on to another promising region. The initial positions of
the new sub-swarm are selected using a scouting process
around the best position found by the previous sub-swarm.
With fewer iterations per particle, it may be beneficial to
increase the convergence rate of the sub-swarms (i.e. decrease
the constriction factor). In standard PSO the velocities of each
particle are updated by
𝑣
𝑑
= 𝑥 𝑣
𝑑
+ 𝑐
1
∈
1
𝑝𝑏𝑒𝑠𝑡
𝑑
− 𝑥
𝑑
+ 𝑐
2
∈
2
𝑔𝑏𝑒𝑠𝑡
𝑑
−
𝑥 𝑑------- (2)
In (2), v is the particle‘s velocity; x is the position of the
particle, and d isa given dimension. The variables ∈ 1and∈
2are random values, which to gether with the weights c1 and c2
determine the contribution of attractions to the personal and
global bests pbestd and gbestd respectively. The constriction
factor is represented by x, the specific value used for the
constriction factor in [6] is x = 0.792.By changing the value of
this parameter, it is possible to modify the particle‘s
momentum, and therefore either promote a more exploratory or
amore exploitative behaviour.
3.5. Finite Impulse Response Filter with MSO
The impulse response of an Nth-order discrete-time FIR filter
lasts for N + 1 samples, and then settles to zero. Higher orders
give sharper cut-off in the frequency response therefore; the
desired sharpness will determine the filtering order. The default
window is the Hamming of size N +1. The FIR filter (w) is
represented by
𝑤 = 0.54 − 0.46 cos
2𝜋𝑛
𝑁
for0≤n≤N—--(3)
The cut-off frequency must be identified for the ECG signal to
be filtered. The next section provides the test results achieved
for automatic identification of the cut-off frequency by the
MSONN and the FIR filter in denoising the ECG signals.
4. ANALYSIS OF EXPERIMENTAL
The proposed system performance using the configured MSO
with NN is tested by measuring various parameters. The FIR is
implemented with the cut-off frequency parameter identified by
the MSO and the results are evaluated against the clean and
conventionally filtered 12 channel ECG Waveform. Validate
the using k-folding and m K Swam method with k= 3 to 10. For
each of the k times of NN training with different partitions of
the training data and test data. One of the NN method is 70% of
the samples in the dataset were used for training with the non-
over lapping 30% for testing.
Clean signals would allow for more accurate evaluation of the
effectiveness of the proposed method in terms of identification
of appropriate cut-off values. Test data sets collected from
PhysioNet data center with original that are influenced by
noise, and there is no access to actual clean signals. Some of
the noise signals are simulated by adding a small value of high
frequency components of random noise mixed the natural
noise. In this paper, two methods are used for analyzing the
noise accuracy namely Mean Squared Error and another one is
Membership Functions. The Mean Squared Error (MSE) is
measured for varying numbers of hidden nodes and number of
training points. To decrease the complexity of the network and
increase training speed, fewer nodes in the hidden layer are
preferred. The MSE equation is shown below (4):
𝑀𝑆𝐸 =
1
𝑁
𝑦
𝑛
− 𝑡
𝑛
𝑁−1
𝑛=0
2
---- (4)
Where 𝑦
𝑛
is the output of the network, 𝑡
𝑛
is the desired target
and N is the number of test records. Membership Functions for
each input and output, training data sets, type of MFs for each
input and output, MSONN and etc. is determined by learning
data. The MFs change after the training according to the level
of noise present in signal. Increasing number of training epochs
decreases Mean Square Error (MSE) but after 100, 500training
samples MSE achieve steady state level because parameters of
MFs are stable. First case research start with some assumed
value with FIR.
Algorithm Multi-swarm optimization ()
{
loop maxLoop times
for each swarm
for each particle
compute new cutoff frequency
use cutoff frequency to update position
check if a new best cutoff frequency has been
found
end for
end for
end loop
}

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Fig 9: Performance analysis accuracy results for FIR with MSO
NN
Then this research is used the MSO NN with 100, 500, 1000,
1500 and 2000 training samples with 3 nodes of the NN and
opposite direction identical increased the test data ratio also,
symbolized in above figure 9. Outcome of research is each time
performance is increased when sample increased after 1000
samples, it shows same accuracy. So changed the testing point
of view of this research is start the increasing of the NN node
with hidden layers, then outcome this direction of the research
give some more better results. But in this direction after 7
hidden layers, gives same accuracy performance. Figure 9
shows performance the MSE results achieved by using different
ways of the research outcomes. It shows that the MSONN has
the best performance with 7 nodes in the hidden layer with
1000 training samples with test data.
5. CONCLUSIONS
In this paper, proposed a novel method to find the cut-off
frequency parameter using MSO is used to remove noise in 12
channel ECG waveforms. Multi-swarm generalizations of
particle swarms and compared their performance on a
benchmark dynamic multi-modal environment and parallel for
each channel using different sub swarms. It is an assembly of
charged particle swarm optimizers. It is already known that
surrounding a neutral or conventional PSO sub-swarm with an
orbiting sub-swarm of mutually repelling particles increases
swarm diversity. This improves performance of the multi-
channel Waveforms cut-off frequency identification in terms of
SNR and time complexity. Compared different NN hidden
layer gives best results using 10 Swarm and 2 hidden layers.
Future extended problem with more sub-swarms with increase
of the multilevel hidden layers to find the different cut-off
frequency parameters.
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AssumedCutoff…
500tranning…
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1000tranning…
1000tranning…
Series1

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BIOGRAPHIES:
Prof. M.Srinivasulu, received his B.Tech
Degree in Electronics & Communication
Engineering and M.Tech degree in Electronic
Instrumentation & Communication Systems
from S V University-Tirupati, A.P-India. He is
currently working as Professor in the
Department of ECE in LAQSHYA
INSTITUTE OF TECHNOLOGY & SCIENCES, Khammam,
A.P-India. His research interests on Signal Processing and
Communication Systems. He is a Member of IEEE, Member of
Institution of Engineers (MIE) and Member of Indian Society
for Technical Education (MISTE).
Dr.K.CHENNAKESHAVA REDDY is the
Principal, Bharathi Engg. College and
Professor of Electronics & Communication
Engg. He did his B.E. & M.Tech. from
Regional Engg. College-Warangal and Ph.D.
from JNTU-Hyderabad. He was the former
Director of Evolution –JNTUH, Principal of
JNTU –Jagtiyal & Deputy Director of UGC-Academic Staff
college –JNTUH.He was an expert committee member
constituted by AICTE, South Western region, Bangalore. He
Published 20-International, 50-National Research papers in
various international & National Journals. He also guided 16
Ph.D. Research scholars.

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