Auscultation: The act
of listening to sounds
within the body.
* S3 & S4
Produced due to:
clicking, rushing, or
gurgling noise that
are either heard
before, between, or
after the normal
Presence of noise in PCG signals effect
the quality of sound.
Aim of PCG is to provide a
complementary tool to record heart
sound and murmurs.
An effective noise elimination can be
obtained using an adaptive filter.
COMPONENTS OF THE DEVICE
Analogue to Digital
- air-coupled sensor which measures
pressure waves induced by chest wall
- To acquire PCG signals
-Function: Elimination of noise components.
-It is a filter that self-adjusts its transfer
function according to an optimization
logarithm driven by an error signal
PCG feature extraction using DWT
db 4,5 levels
Db 4,5 levels
Generates Heart Sounds
•Analogue to Digital Converter
- A device that converts a continuous physical
quantity to a digital number that represents
- Here, the filtered PCG signals are converted
into digital form.
- A small computer on a single ‘integrated
circuit containing a processor core, memory
& programmable I/P-O/P peripherals.
- 16-bit MSP430F5438 is used.
- Programmed to give an alert(o/p) on
occurrence of abnormalities.
INPUT PC SIGNAL
Method for the estimation of the splitting interval (SI) between the aortic (A2)
and pulmonary (P2) components of the second heart sound (S2).
Superior noise cancellation
Acts as Pre-indicator for abnormal heart.
Helpful in rural areas, in absence of
cardiologist for further diagnosis.
Can provide clues of the cause of heart
It is pertinent to consider a time
sequence of patient data.
Better recording of the desired signal can
Provides valuable information about
functional integrity of the heart.
Thus, has high potential for detecting
various heart diseases.
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