Results 261 to 270 of about 3,426,911 (314)

Acoustic Reflex Measurement

Archives of Otolaryngology - Head and Neck Surgery, 1976
To the Editor. —The article by Surr and Schuchman, "Measurement of the Acoustic Reflex Without a Pressure Seal," published in the March Archives (102:160-161, 1976), should be a reminder to those who use acoustic reflex measurements routinely, that such testing should not be abandoned simply because a hermetic seal cannot be obtained.
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Progress in Measurements in Acoustics

Metrologia, 1967
Although the speed of sound in air was measured with reasonable accuracy about the middle of the 17th century, intensity measurements did not properly begin until Rayleigh, in 1882, published his experiments with what came to be called the Rayleigh disc. The accuracy remained relatively low (about 10%) until about 1940.
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Acoustic measurement of the respiratory system— An acoustic pneumograph

Medical & Biological Engineering, 1976
A 200 Hz tone from a sinewave generator was utilised to monitor respiration. The sound was led into the lung from the mouth and the transmitted sound was detected through the thoracic cage by a phonocardiogram microphone fixed on the chest wall. The microphone output voltage, represented by its absolute mean value, varied with the respiration of the ...
M, Miyakawa, K, Yamamoto, T, Mikami
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Acoustic measurement of erythrocyte compressibility

The Journal of the Acoustical Society of America, 1982
Adiabatic compressibility of red blood cells obtained from humans using a modified ultrasound velocity technique has been determined and correlated to the mean cellular hemoglobin concentration of the red blood cells. The ultrasound technique has an accuracy of better than 0.1%.
K K, Shung, B A, Krisko, J O, Ballard
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Accuracy of Acoustic Rhinometry Measurements

The Laryngoscope, 2001
AbstractObjectives To identify the factors that influence the accuracy of acoustic rhinometry measurements recorded with commercially available equipment.Study Design A simple model was used which consisted of a metal pipe and cylindrical inserts. These inserts comprised various lengths, and aperture dimensions were comparable to, or smaller than, the ...
O, Cakmak, H, Celik, T, Ergin, L, Sennaroglu   +3 more
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Simplified Room Acoustic Measurements

The Journal of the Acoustical Society of America, 2008
Standardised room acoustic measurements are needed for concert halls etc., but they imply heavy equipment. Thus, many interesting rooms are not measured. Most musicians (and even some acousticians) find that clapping and shouting in a room/hall might give an overview of the room acoustics.
T HALMRAST, A BUEN
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Acoustic Measurements of Objective Tinnitus

Journal of Speech, Language, and Hearing Research, 1990
Ear canal sound pressure levels were measured from a 38-year-old woman who had experienced objective tinnitus in her right ear for approximately 2 years. The tinnitus sounded like a series of “sighs” that were synchronous with her pulse rate. Because the level of the tinnitus fluctuated in a pulsing manner, it appeared to be of vascular origin ...
C A, Champlin, S P, Muller, S A, Mitchell   +2 more
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A Method of Measuring Acoustic Impedance

The Journal of the Acoustical Society of America, 1932
An apparatus s described whereby acoustic impedances may be measured in terms of a known acoustic impedance and the complex ratios of two electrical potentiometer readings to a third. As a known impedance, there is chosen the reactance of a closed tube of uniform bore which is an eighth wave-length long.
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INFORMATIONAL CAPACITY OF ACOUSTIC MEASUREMENTS

Journal of Computational Acoustics, 2001
Presented is the theoretical model for extracting the system response from measurements of the acoustic wave propagating through the linear system. Based on the results of this analysis, measurements are described as a convolution of the impulse response of the system with the mixed-phase-lag nonstationary forward wavelet (or source-generated ...
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Amplitude measurement in acoustic emission

Review of Scientific Instruments, 1985
A circuit capable of measuring the amplitude of continuous emission and acoustic bursts is presented. The circuit shows linear behavior (+/−5%) over a dynamic range in excess of 65 dB, for frequencies up to 250 KHz. Possible applications are discussed.
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