acoustic compression wave
1Acoustic impedance — The acoustic impedance Z (or sound impedance) is a frequency f dependent parameter and is very useful, for example, for describing the behaviour of musical wind instruments. Mathematically, it is the sound pressure p divided by the particle… …
2Acoustic wave — An acoustic wave is a weak compression wave (meaning a small pressure change) that moves at the speed of sound. As opposed to a shock wave, the pressure change is continuous, and the wave is isentropic, meaning energy is conserved as it… …
3Lossless data compression — is a class of data compression algorithms that allows the exact original data to be reconstructed from the compressed data. The term lossless is in contrast to lossy data compression, which only allows an approximation of the original data to be… …
4Radio acoustic sounding system — A radio acoustic sounding system (RASS) is a system for measuring the atmospheric lapse rate using backscattering of radio waves from an acoustic wave front to measure the speed of sound at various heights above the ground. This is possible… …
5shock wave — 1. a region of abrupt change of pressure and density moving as a wave front at or above the velocity of sound, caused by an intense explosion or supersonic flow over a body. 2. a repercussion from a startling event or upheaval; series of… …
6sound wave — noun (acoustics) a wave that transmits sound (Freq. 3) • Syn: ↑acoustic wave • Topics: ↑acoustics • Hypernyms: ↑wave, ↑undulation …
7Cochlear amplifier — The cochlear amplifier was first proposed in 1948 by T. Gold[1]. This was around the time when Georg von Békésy was publishing articles observing the propagation of passive travelling waves in the dead Cochlea. Thirty years later the first… …
8Cavitation — is defined as the phenomenon of formation of vapour bubbles of a flowing liquid in a region where the pressure of the liquid falls below its vapour pressure. Cavitation is usually divided into two classes of behavior: inertial (or transient)… …
9Sonoluminescence — is the emission of short bursts of light from imploding bubbles in a liquid when excited by sound.HistoryThe effect was first discovered at the University of Cologne in 1934 as a result of work on sonar. H. Frenzel and H. Schultes put an… …
10Valveless pulse jet — A Valveless pulse jet (or pulsejet) is one of the simplest jet propulsion devices ever designed, and is the simplest form of jet engine that does not require forward motion to run continuously. Valveless pulsejets are low in cost, light weight,… …
