Results 251 to 260 of about 376,655 (299)
Some of the next articles are maybe not open access.
The Journal of the Acoustical Society of America, 1983
Wall deflections of a multi-lobe type noise suppressing nozzle are minimized without the use of external struts and by the use of only a single internal strut per lobe. The lobes have either a substantially elliptical or substantially circular shape in cross section and they merge into valley regions of substantially circular curvature in cross section.
Claude R. Stachowiak, Fred R. Kunze
openaire +1 more source
Wall deflections of a multi-lobe type noise suppressing nozzle are minimized without the use of external struts and by the use of only a single internal strut per lobe. The lobes have either a substantially elliptical or substantially circular shape in cross section and they merge into valley regions of substantially circular curvature in cross section.
Claude R. Stachowiak, Fred R. Kunze
openaire +1 more source
The Journal of the Acoustical Society of America, 1998
The noise generated by a snowmobile track in operation can be reduced and attenuated by arranging for the track elements such as the drive lugs and ground-engaging lugs to have a degree of non-uniformity in their repeating pattern and thus to avoid the generation of peak noise levels at particular frequencies.
openaire +1 more source
The noise generated by a snowmobile track in operation can be reduced and attenuated by arranging for the track elements such as the drive lugs and ground-engaging lugs to have a degree of non-uniformity in their repeating pattern and thus to avoid the generation of peak noise levels at particular frequencies.
openaire +1 more source
System for noise suppression, transceiver and method for noise suppression
The Journal of the Acoustical Society of America, 2006A system with an accompanying method is provided to improve the signal-to-noise ratio (SNR) of noisy speech by suppressing acoustic background noise. The background noise consists of narrow band noise from rotating machine, audio signals from stereo-loudspeakers of audio entertainment device, and other ambient noise.
Ming Zhang, Hui Lan
openaire +1 more source
The Journal of the Acoustical Society of America, 1991
A hydrophone mounted on the hull of a ship comprises an electromechanical ansducer made of void-containing ceramic material having a high piezoelectric sensitivity to water-borne acoustic sound signals, a transducer made of solid ceramic material having a low piezoelectric sensitivity to hydrostatic acoustic signals, both transducers having similar ...
openaire +1 more source
A hydrophone mounted on the hull of a ship comprises an electromechanical ansducer made of void-containing ceramic material having a high piezoelectric sensitivity to water-borne acoustic sound signals, a transducer made of solid ceramic material having a low piezoelectric sensitivity to hydrostatic acoustic signals, both transducers having similar ...
openaire +1 more source
Coherent Optical Noise Suppression
Applied Optics, 1968The performance of coherent optical spatial filtering systems is often limited by lens noise. Imperfections in the optical components generate noisy diffraction patterns when illuminated by spatially coherent light. This random noise often masks useful signals in the output images.
openaire +2 more sources
The Journal of the Acoustical Society of America, 2006
A noise suppression device comprises subband SN ratio calculation means which receives a noise likeness signal, an input signal spectrum and a subband-based estimated noise spectrum, calculates the subband-based input signal average spectrum, calculates a subband-based mixture ratio of the subband-based estimated noise spectrum to the subband-based ...
openaire +1 more source
A noise suppression device comprises subband SN ratio calculation means which receives a noise likeness signal, an input signal spectrum and a subband-based estimated noise spectrum, calculates the subband-based input signal average spectrum, calculates a subband-based mixture ratio of the subband-based estimated noise spectrum to the subband-based ...
openaire +1 more source
Noise Suppression in Coherent Imaging
Applied Optics, 1973Several noise suppression techniques in coherent imaging systems are described. For holographic imaging the diffuse wave, periodic phase modulation, and multiple wave techniques are compared and the implementation of the last is considered. For lens-type imaging systems the use of multiple incoherent waves results in excellent noise suppression.
J, Upatnieks, R W, Lewis
openaire +2 more sources
The Journal of the Acoustical Society of America, 1989
An improved noise suppression system (400) is disclosed which performs speech quality enhancement upon speech-plus-noise signal available at the input (205) to generate a clean speech signal at the output (265) by spectral gain modification. The noise suppression system of the present invention includes a background noise estimator (420) which ...
openaire +1 more source
An improved noise suppression system (400) is disclosed which performs speech quality enhancement upon speech-plus-noise signal available at the input (205) to generate a clean speech signal at the output (265) by spectral gain modification. The noise suppression system of the present invention includes a background noise estimator (420) which ...
openaire +1 more source
Turbofan-engine noise suppression.
Journal of Aircraft, 1968Program for perceived noise levels reduction on ground of turbofan powered commercial transport by acoustically absorptive lining of ...
ROBERT E. PENDLEY, ALAN H. MARSH
openaire +1 more source
Holographic microinterferometer with noise suppression
Applied Optics, 1989Holographic microinterferometer with the noise suppression is presented. The noise suppression method proposed consists of synchronous deflection of both beams. The method is applied on every step of the holographic process as well as during holographic interferometric investigations.
openaire +2 more sources