Signal compression technique in decomposition of arrivals having different speed of sound propagation through human lungs in the frequency range of 10–19 kHz

2018 ◽  
Vol 143 (3) ◽  
pp. 1761-1761
Author(s):  
Vladimir Korenbaum ◽  
Anton Shiryaev ◽  
Anatoly Kostiv ◽  
Maria Safronova
Keyword(s):  
Speed Of Sound ◽  
Sound Propagation ◽  
Signal Compression ◽  
Frequency Range ◽  
Compression Technique ◽  
Human Lungs

Research of the Wood’s Alloy Crystallization Process Using the Acoustic Method

2021 ◽  
Vol 410 ◽  
pp. 855-861
Author(s):  
Aleksandr Yu. Yaroslavkin ◽  
Eugene A. Tyurin ◽  
Darya A. Melnikova
Keyword(s):  
Speed Of Sound ◽  
Crystallization Process ◽  
Ultrasonic Method ◽  
Single Pulse ◽  
Acoustic Method ◽  
The State ◽  
Sound Signal ◽  
Frequency Range ◽  
Wood’S Alloy

The article examines the process of crystallization of Wood alloy using the ultrasonic method. The dependence of the determination of the speed of sound in three aggregate states of the alloy (liquid, solid, transition (liquid-solid)) was derived. The relation-ship with the amplitude values of the sound signal, a single pulse in determining the speed of sound, as well as in determining the state of the alloy is carried out. The data obtained allow us to analyze the state of the alloy and the measurement time and the specified frequency range directly in the process of crystallization.

SOUND PROPAGATION THROUGH STRUCTURAL COMPONENTS UNDER CONDITIONS OF NON-RIGID CONTACT AT THE BOUNDARIES BETWEEN THEM

Akustika ◽  
2021 ◽  
Author(s):  
Konstantin Abbakumov ◽  
Anton Vagin ◽  
Alena Vjuginova
Keyword(s):  
Boundary Conditions ◽  
Inhomogeneous Medium ◽  
Dispersion Equation ◽  
Numerical Solutions ◽  
Sound Propagation ◽  
Structural Components ◽  
Frequency Range ◽  
Problem Statement ◽  
Ultrasonic Measurements ◽  
Rigid Contact

The report considers the problem statement, derivation and solution of the dispersion equation for sound propagation in a layered inhomogeneous medium with oriented fracturing, simulated by the presence of boundary conditions in the "linear slip" approximation. Numerical solutions are obtained and analyzed for the frequency range and values of the parameters of contact breaking, which is relevant in the problems of ultrasonic measurements

A lossless speech signal compression technique

2019 ◽  
Author(s):  
Md. Atiqur Rahman ◽  
Most. Jannatul Ferdous ◽  
Md. Mamun Hossain ◽  
Md Rashedul Islam ◽  
Mohamed Hamada
Keyword(s):  
Speech Signal ◽  
Signal Compression ◽  
Compression Technique

scholarly journals Airborne noise calculation for single-layer partitions with the concentrated parameters method

2021 ◽  
Vol 2131 (2) ◽  
pp. 022075
Author(s):  
A V Zakharov ◽  
I P Saltykov
Keyword(s):  
Sound Propagation ◽  
Single Layer ◽  
Sound Insulation ◽  
Systems Of Equations ◽  
Flexural Waves ◽  
Frequency Range ◽  
Standard Frequency ◽  
Sound Fields ◽  
Standard Spectrum ◽  
Airborne Noise

Abstract The article considers an approach to the calculation of sound insulation for building partitions with the method of concentrated parameters at the standard frequency range, which is specified in regulatory documents. The concepts of “reduced” and “concentrated” masses are introduced for objects that are sound conductors. It is noted that the physical model of sound insulation in the three conditionally allocated frequency ranges of the standard spectrum has differences. The calculated equations of sound insulation for three frequency ranges are given. Systems of equations for obtaining the calculation formulas at the first and the second frequency ranges are used. The systems consist of equations for the conservation of the amount of motion and the conservation of kinetic energy. The influence of the damping effect of air and resonant phenomena in the plate on the final value of sound insulation is described. The nature of sound propagation in the third frequency range is considered, in which, unlike the first two sections of the frequency spectrum, where the propagation of flexural waves is mainly recorded in the plate, shear and dilatational vibrations have a predominant influence on the sound insulation level. Examples of graphs for massive partitions obtained by the considered method are given. The accuracy of the proposed method is evaluated in comparison with the normative code’s method and the method based on the theory of self-matching of sound fields. A general algorithm for calculating sound insulation in the entire standard frequency range is presented.

Influence of Internal Wave on the Sound Propagation in the Subsurface Bubble Layer

2011 ◽  
Vol 8 (1) ◽  
pp. 54-64
Author(s):  
R. Grimshaw ◽  
L.A. Ostrovsky ◽  
A.S. Topolnikov ◽  
K.R. Khusnutdinova
Keyword(s):  
Internal Wave ◽  
Speed Of Sound ◽  
Acoustic Signal ◽  
Sound Propagation ◽  
Japan Sea ◽  
Subsurface Ocean ◽  
Ocean Layer ◽  
Bubble Layer ◽  
Linear Internal Wave ◽  
Local Speed

In the paper the influence of non-linear internal wave on the propagation of acoustic signal in the subsurface ocean layer containing gas bubbles is considered. During interaction with surface waves the internal wave causes its collapse and influences the structure of bubble layer. Inhomogeneous structure of the layer promotes the local speed of sound and intensity of scattering near the ocean surface to modulate by internal wave with slight shift in phase in the direction of its propagation, which agree with recent experimental observations made on the shelf of Japan Sea.

A Ternary Solution for Independent Acoustic Impedance and Speed of Sound Matching to Biological Tissues

1982 ◽  
Vol 4 (2) ◽  
pp. 163-170 ◽  
Author(s):  
Jonathan Ophir ◽  
Paul Jaeger
Keyword(s):  
Speed Of Sound ◽  
Acoustic Impedance ◽  
Soft Tissues ◽  
Sound Propagation ◽  
Biological Tissues ◽  
Liquid System ◽  
The Body ◽  
Acoustic Parameters ◽  
Wide Range

In applications requiring a liquid which is acoustically well matched to biological tissues, it is often difficult to find a material which is matched well in terms of both the acoustic impedance and speed of sound propagation in it; changing one parameter invariably affects the other. A three component liquid system is described, which allows independent adjustment of these two acoustic parameters over a wide range. This range encompasses the soft tissues of the body. Results of parameter measurements are presented in the form which allows simple determination of the mixture required to match any combination of acoustic impedance and speed of sound propagation over a given range.

scholarly journals ECG SIGNAL COMPRESSION TECHNIQUE BASED ON DWT AND EXPLOITATION OF INTERBEATS AND INTRABEATS CORRELATIONS

2015 ◽  
Vol 43 (6) ◽  
pp. 837-856
Author(s):  
Mohamed M. Abo-Zahhad ◽  
Aziza I. Hussein ◽  
Abdelfatah M. Mohamed
Keyword(s):  
Ecg Signal ◽  
Signal Compression ◽  
Compression Technique

An ECG signal compression technique using ASCII character encoding

Measurement ◽  
2012 ◽  
Vol 45 (6) ◽  
pp. 1651-1660 ◽  
Author(s):  
S.K. Mukhopadhyay ◽  
S. Mitra ◽  
M. Mitra
Keyword(s):  
Ecg Signal ◽  
Signal Compression ◽  
Compression Technique ◽  
Ascii Character
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