The document discusses the design of hardware to acquire electrocardiogram (ECG) signals. It describes the electrical activity of the heart that the ECG measures, sources of noise in ECG signals, and the design of an analog front-end circuit including an instrumentation amplifier, virtual ground circuit, band-pass filter, notch filter, and output buffer to process ECG signals before digitization and display. The circuit is being built for a lab experiment to capture and analyze ECG signals.
ECG COMPRESSION USING
FFT
The electrocardiogram (ECG) is a diagnostic tool that is routinely used to assess the electrical and muscular functions of the heart. Sometimes it is required to send the ECG signals from one place to another place. The ECG signals are compressed at first to reduce the amplitude and frequency and then transferred. ECG signals are compressed by using many techniques. One of the most important technique is FFT.
FFT (Fast Fourier Transform) is a technique used to convert analog signal to digital signal.
In FFT, The total process takes five steps:-
1) Input signal
2) Compression (counter A)
3) Compression (counter B)
4) Recovery of the original signal by using IFFT
5) Error checking
Now the detailed explanation of the above steps is given below
At first the input signal (ECG signal) is taken.
There are two stages for compression. In first stage of compression there is a counter A. It identifies the non-zero values of the signal before compression. After compression if the length of the compressed signal is less than the length of the actual signal, then zero padding is done to make equal the lengths of compressed and actual signal.
Now the signal is passed through the counter B. It identifies the non-zero values after the compression of the signal. Now after compression if the length of the compressed signal is greater than the length of the actual signal, then TRUNCATION of the signal is done.
Now by applying IFFT (Inverse Fast Fourier Transform) the original ECG signal is recovered.
The Error is checked at the last stage.
Compression ratio is given by
CR=(B-A)/B *100
CR-Compression ratio
A-compression in counter A
B-compression in counter B
Compression ratio is a major factor to determine how much compression the signal undergoes.
The compressed signal contains only positive values.
Thus ECG signal is compressed by using FFT technique.
Applications:-
• It finds application in hospitals, when a patient’s report is to be send to another doctor in prenomial place.
ECG COMPRESSION USING
FFT
The electrocardiogram (ECG) is a diagnostic tool that is routinely used to assess the electrical and muscular functions of the heart. Sometimes it is required to send the ECG signals from one place to another place. The ECG signals are compressed at first to reduce the amplitude and frequency and then transferred. ECG signals are compressed by using many techniques. One of the most important technique is FFT.
FFT (Fast Fourier Transform) is a technique used to convert analog signal to digital signal.
In FFT, The total process takes five steps:-
1) Input signal
2) Compression (counter A)
3) Compression (counter B)
4) Recovery of the original signal by using IFFT
5) Error checking
Now the detailed explanation of the above steps is given below
At first the input signal (ECG signal) is taken.
There are two stages for compression. In first stage of compression there is a counter A. It identifies the non-zero values of the signal before compression. After compression if the length of the compressed signal is less than the length of the actual signal, then zero padding is done to make equal the lengths of compressed and actual signal.
Now the signal is passed through the counter B. It identifies the non-zero values after the compression of the signal. Now after compression if the length of the compressed signal is greater than the length of the actual signal, then TRUNCATION of the signal is done.
Now by applying IFFT (Inverse Fast Fourier Transform) the original ECG signal is recovered.
The Error is checked at the last stage.
Compression ratio is given by
CR=(B-A)/B *100
CR-Compression ratio
A-compression in counter A
B-compression in counter B
Compression ratio is a major factor to determine how much compression the signal undergoes.
The compressed signal contains only positive values.
Thus ECG signal is compressed by using FFT technique.
Applications:-
• It finds application in hospitals, when a patient’s report is to be send to another doctor in prenomial place.
Noise Cancellation in ECG Signals using ComputationallyCSCJournals
Several signed LMS based adaptive filters, which are computationally superior having multiplier free weight update loops are proposed for noise cancellation in the ECG signal. The adaptive filters essentially minimizes the mean-squared error between a primary input, which is the noisy ECG, and a reference input, which is either noise that is correlated in some way with the noise in the primary input or a signal that is correlated only with ECG in the primary input. Different filter structures are presented to eliminate the diverse forms of noise: 60Hz power line interference, baseline wander, muscle noise and the motion artifact. Finally, we have applied these algorithms on real ECG signals obtained from the MIT-BIH data base and compared its performance with the conventional LMS algorithm. The results show that the performance of the signed regressor LMS algorithm is superior than conventional LMS algorithm, the performance of signed LMS and sign-sign LMS based realizations are comparable to that of the LMS based filtering techniques in terms of signal to noise ratio and computational complexity.
Here is a ppt of AC SIGNAL SOURCES. IT IS A TOPIC COVERED IN A SUBJECT CALLED MEASUREMENT AND INSTRUMENTATION , IN ENGINEERING BRANCH OF IC .
HOPE YOU LIKE IT , GIVE A LIKE AND SHARE IT TO NECESSITERS.
An ECG (electrocardiogram) records the electrical activity of your heart at rest. It provides information about your heart rate and rhythm and shows if there is an enlargement of the heart due to high blood pressure (hypertension) or evidence of a previous heart attack (myocardial infarction).
Questions and Answers related to ECG and illustration. Short assignment with diagram and images
Slideshow is from the University of Michigan Medical School's M1 Cardiovascular / Respiratory sequence
View additional course materials on Open.Michigan:
openmi.ch/med-M1Cardio
Noise Cancellation in ECG Signals using ComputationallyCSCJournals
Several signed LMS based adaptive filters, which are computationally superior having multiplier free weight update loops are proposed for noise cancellation in the ECG signal. The adaptive filters essentially minimizes the mean-squared error between a primary input, which is the noisy ECG, and a reference input, which is either noise that is correlated in some way with the noise in the primary input or a signal that is correlated only with ECG in the primary input. Different filter structures are presented to eliminate the diverse forms of noise: 60Hz power line interference, baseline wander, muscle noise and the motion artifact. Finally, we have applied these algorithms on real ECG signals obtained from the MIT-BIH data base and compared its performance with the conventional LMS algorithm. The results show that the performance of the signed regressor LMS algorithm is superior than conventional LMS algorithm, the performance of signed LMS and sign-sign LMS based realizations are comparable to that of the LMS based filtering techniques in terms of signal to noise ratio and computational complexity.
Here is a ppt of AC SIGNAL SOURCES. IT IS A TOPIC COVERED IN A SUBJECT CALLED MEASUREMENT AND INSTRUMENTATION , IN ENGINEERING BRANCH OF IC .
HOPE YOU LIKE IT , GIVE A LIKE AND SHARE IT TO NECESSITERS.
An ECG (electrocardiogram) records the electrical activity of your heart at rest. It provides information about your heart rate and rhythm and shows if there is an enlargement of the heart due to high blood pressure (hypertension) or evidence of a previous heart attack (myocardial infarction).
Questions and Answers related to ECG and illustration. Short assignment with diagram and images
Slideshow is from the University of Michigan Medical School's M1 Cardiovascular / Respiratory sequence
View additional course materials on Open.Michigan:
openmi.ch/med-M1Cardio
IT IS USEFULL FOR THE PHARM D & B.PHARM STUDENTS AND ALSO DIPLOMA IN PHARMACY STUDENTS AND MEDICAL STUDENTS LIKE MBBS AND DENTAL AND BHMS STUDENTSAND ALSO NUSRING STUDENTS
The property of automaticity of the sinus node is responsible foe the impulse initiation and travels along the cardiac tissue as depolarizations which result in its contraction. So, when activated, the heart is a concentrated locus of time varying potentials in the body. These voltage fluctuations can be measured by the placement of electrodes on the surface of the body. This forms the basis of electrocardiography. In this presentation we will see the basics, the lead systems and the principles behind recording of ECG.
The topic is about heart related diseases and how it can be cured.what are the diseases and what are the treatments and methods. You should view it.it may be helpful to you people.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
ABOUT ECG AND PCG The electrocardiograph (ECG) is an instrument which records the electrical activity of the heart. ... ECG provides valuable information about a wide range of cardiac disorders such as the presence of an inactive part (infarction) or an enlargement (cardiac hypertrophy) of the heart muscle.
The electrocardiograph (ECG) is an instrument which records the electrical activity of the heart. ... ECG provides valuable information about a wide range of cardiac disorders such as the presence of an inactive part (infarction) or an enlargement (cardiac hypertrophy) of the heart muscle.
How many patients does case series should have In comparison to case reports.pdfpubrica101
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2. 11/10/14
2
membrane composed of a lipid bilayer with
embedded proteins
Membrane potential
• Ion transporter/pump
proteins actively
push ions;
• ion channels allow
ions to move.
• electrically equivalent
to a set of batteries
and resistors inserted
in the membrane
As a result, we get a membrane resting potential of about -70mV
3. 11/10/14
3
Depolarization
Sodium ions rush in
Hyperpolarization
Potassium ions rush out
Sodium-Channel Potassium- Channel
Typical values of membrane potential: –40 mV to –80 mV.
Voltage- and Time dependent activation of Ion Channels:
the physiological basis for action potentials
4. 11/10/14
4
Bioelectric Signals
ECG Electro-Cardiogram, Heart activity
EMG Electro-Myogram, Muscle movement
EOG Electro-Oculogram, Eye movement
EEG Electro-Encephalogram
GSR Galvanic Skin Response
● Measured with electrodes:
skin-electrode interface: Ions <--> Electrodes
Breathing, temperature, movement etc.
● Measured with other sensors / transducers:
NTC, LDR, piezo-crystal, hall-sensor,
Accelerometer, Goniometer, …
5. 11/10/14
5
ECG Electro-Cardiogram, Heart activity <<<<<<<<<<
EMG Electro-Myogram, Muscle movement
EOG Electro-Oculogram, Eye movement
EEG Electro-Encephalogram
GSR Galvanic Skin Response
● Measured with electrodes:
skin-electrode interface: Ions <--> Electrodes
Breathing, temperature, movement etc.
● Measured with other sensors / transducers:
NTC, LDR, piezo-crystal, hall-sensor,
Accelerometer, Goniometer, …
>>>>
BACKGROUND
n ECG/EKG (electrocardiogram)
Records the heart's electrical activity:
ü Heart beat rate
ü Heart beat rhythm
ü Heart strength and timing
6. 11/10/14
6
BACKGROUND
n The heart's electrical system:
n Sinoatrial(SA) node
n Atrioventricular(AV)
node
n His-Purkinje system
The heart's electrical system:
7. 11/10/14
7
BACKGROUND
ECG works mostly by detecting
and amplifying the tiny
potential changes on the skin
that are caused when the
electrical signal in the heart
muscle is charged and spread
during each heart beat.
This is detected as tiny rises
and falls in the voltage
between two electrodes placed
either side of the heart.
BACKGROUND
P wave: signal spread from
SA node to make the atria
contract.
P-Q Segment: signal arrives
AV node stay for a instant
to allow the ventricle to
be filled with blood.
Q wave :After the Bundle of
His the signal is divided
into two branches and
run through the septum.
R,S wave: Left and right
ventricle contraction are
marked by the R,S wave.
T wave: ventricle relaxingSchematic representation of
normal ECG
8. 11/10/14
8
ECG SIGNAL
n ECG bio-signal typical specifications:
Ø low differential voltage from 0.4 to 3 mV
Ø high common-mode rejection ratio level
Ø low frequency range
Ø high noise
ECG SIGNAL
l Artifacts (disturbances) can have many causes.
Common causes are:
p Movement
Baseline drift
Sudden movement
9. 11/10/14
9
ECG SIGNAL
p Electrical interference
àFrom a nearby electrical appliance. A typical example
is a 100 Hz background distortion from fluorescent
lights. To be confused with atrial fibrillation.
ECG ELECTRODE
n Lead
u The signal recorded as the difference between two
potentials on the body surface is called an "ECG
lead". Each lead is said to look at the heart from a
different angle.
10. 11/10/14
10
ELECTRODE
n Lead position
Lead III Lead 12
ECG ELECTRODE
① Limb Leads (Bipolar)
② Chest Leads (Unipolar)
③
Augmented Limb Leads
(Unipolar)
Wet, dry and insulating…
A typical surface electrode used
for ECG recording is made of Ag/
AgCl, as shown on right Figure.
The disposable electrodes are
attached to the patients’ skin
and can be easily removed.
11. 11/10/14
11
First, to make sure we know where the heart is
…
Sensing the
heart’s
electrical activity
via electrodes
(contacts placed on
the surface of the
body)
12. 11/10/14
12
Sensing the heart’s
electrical activity
via electrodes
(contacts placed on
the surface of the
body)
Note: anatomical
orientation is from the
subject’s perspective:
The basic four
limb electrodes:
right arm
left leg
left arm
right leg
electrical polarity:
neutral or ground
negative
positive
(manipulated by the EKG
machine)
13. 11/10/14
13
right arm
left leg
left arm
right leg
electrical polarity:
neutral or ground
negative
positive
Lead I (toward left)
for any given
viewing (positive)
electrode:
An approaching train of muscle fiber
depolarizations (or repolarizations moving
away)
is seen as an upward trace on the recording
(opposite movement = downward trace)
Interpreting the view from an electrode
Note: the normal average direction for the heart’s electrical
activity is from the upper right, in the right atrium, to the lower left.
14. 11/10/14
14
P
Q
R
S
T
(This particular tracing does not show a Q wave,
a downward wave just before the R wave.)
The main, typical waves of an EKG.
ATRIA: depol-pause-repol
(atrial repolarization is obscured by ventricular depolarization)
P
17. 11/10/14
17
sources of noise in ECG signals
n Baseline wander (low frequency noise)
n Power line interference ( 60Hz noise from power
lines)
n Muscle noise (This noise is very difficult to remove
as it is in the same region as the actual signal. It is
usually corrected in software.)
n Other interference (i.e., radio frequency noise from
other equipment)
Removal of common mode noise
n Use instrumentation amplifiers with very high common
mode rejection ratios on the order of 100dB
n Drive the patient body with an inverted common mode
signal.
n Apply software algorithms after acquisition for the
removal of noise
18. 11/10/14
18
Our EKG Analog Front End Circuit
Instrumentation Amplifier
• High Common Mode Rejection– 120dB minimum
• Settable gain of 1 to 1000x, controlled by R3
• Low voltage, Single supply
21. 11/10/14
21
This week’s Lab 7
n Build an Analog Front End circuit for an ECG
n Test it
n Connect it to the Teensy ADC
Next Week– display traces on LCD and calibrate
To Standard Grid
Add digital processing to clean up signal
Final week– Add diagnostic signal processing routines
Our EKG Analog Front End Circuit