3d). As an aside, the quiet-point-induced phase noise reduction is also slightly higher than indicated by the calibration tone for lower noise suppression levels (when measured at 500 Hz and 1 kHz offsets). This could result from possible instrument calibration error associated with calibration ...
A Noise Reduction Coefficient – commonly known as NRC – is a single number rating which represents the average of sound Absorption Coefficients of a material at specific mid-range frequencies (tested at 250, 500, 1,000, and 2,000 Hz octaves). The purpose of an NRC rating is to provide...
This work proposes a noise-reduction structure that integrates phase-modulating metasurface (PMM) with acoustic liners (ALs) to enhance the narrow band absorption performance of a duct with relatively small length-diameter ratio. The PMM manipulates the wavefront by introducing different transmission ph...
has a NRC of about 0.70 or greater, a density of about 10 PCF to about 12 PCF, and a thickness of about 1 / 2 to about 1 inch.The acoustic tile can further include a back coating of a surface weight of about 5 grams per square feet (GSF) to about 40 GSF on the dry base mat...
PROBLEM TO BE SOLVED: To improve an afterimage reduction effect when there is a motion of an image with a little luminance difference or when there is a motion of an image with an indistinct contour. SOLUTION: An image signal V<SB>-1</SB>' of a preceding field is subtracted from an ...
search amongst all those sequences of equal or greater abundance than the chimera for possible parents; secondly that chimera removal should, with suitable training data sets, be treated as a problem in classification or 'supervised learning'. Adopting these principles Perseus has the sensitivity to...
This requires the barrier material to have effective dimensions that are much greater than the wavelength of the sound. The effectiveness of sound transmission loss increases with increasing mass of the barrier material, and therefore it may not be a desirable solution if vehicle weight reduction is...
Hearing instrument verification involves measuring the performance of modulation-based noise reduction systems. The article proposes a systematic procedure for their verification. The procedure has the potential for application in the verification of oth
When transformed to curvelet coefficient domain, the wavefield is expressed as the suppression of curvelets characterized by different scales and directions. The interfering phases in time-space domain can be easily separated from one another in directions. The scale of curvelet corresponds to the ...
where F0 is a suitable renormalisation coefficient. While related to the Shannon’s entropy, FIM presents an important difference: it is defined as a function of the difference in probability between consecutive elements of the distribution, as opposed to their raw value—or, in other words, as...