ОПЫТ  ИСПОЛЬЗОВАНИЯ  В  УСЛОВИЯХ  МКС  ТЕХНИЧЕСКИХ  СРЕДСТВ НАУЧНОЙ  АППАРАТУРЫ  «БАР».  ЧАСТЬ  1.  АКУСТИЧЕСКИЕ  ПРИБОРЫ

The paper presents the results of operational testing of two acoustic components of research equipment «Bar» (a leak detector and ultrasound analyzer) onboard the ISS Russian segment. It was found that the ultrasonic (US) background noise interferes in leak search; besides, it exceeds dramatically the adopted noise level constraint thus impacting crew health and efficiency, and oral communication. The narrow-band noise spectra were measured and the expressed tone property of the US noise was demonstrated. The authors make the point that the present noise level constraints for space habitats do not take into account all realities of the life of cosmonauts and lack a solid medical and acoustic background.

Download Full-text

Some Statistical Properties of Signal Plus Narrow Band Noise Integrated over a Finite Time Interval

Journal of Applied Physics ◽

10.1063/1.1722286 ◽

1956 ◽

Vol 27 (12) ◽

pp. 1442-1448 ◽

Cited By ~ 3

Author(s):

L. C. Maximon ◽

J. P. Ruina

Keyword(s):

Finite Time ◽

Narrow Band ◽

Statistical Properties ◽

Time Interval ◽

Finite Time Interval ◽

Narrow Band Noise ◽

Band Noise

Download Full-text

Target detection against narrow band noise backgrounds

Vision Research ◽

10.1016/s0042-6989(98)00330-7 ◽

1999 ◽

Vol 39 (13) ◽

pp. 2191-2203 ◽

Cited By ~ 1

Author(s):

Mark W. Cannon ◽

Greg J. Reese ◽

Steven C. Fullenkamp

Keyword(s):

Target Detection ◽

Narrow Band ◽

Narrow Band Noise ◽

Band Noise

Download Full-text

Search for narrow-band-noise modulations of the infrared transmission of blue bronze

Journal de Physique IV (Proceedings) ◽

10.1051/jp4:20020363 ◽

2002 ◽

Vol 12 (9) ◽

pp. 85-86

Author(s):

R. C. Rai ◽

V. A. Bondarenko ◽

J. W. Brill

Keyword(s):

Absorption Coefficient ◽

Narrow Band ◽

Diode Lasers ◽

Infrared Transmission ◽

Narrow Band Noise ◽

Band Noise ◽

Tunable Diode Lasers ◽

Upper Limits ◽

Blue Bronze

We have searched for narrow-band-noise (NBN) modulations of the infrared transmission in blue bronze, using tunable diode lasers. No modulations were observed, giving an upper limits for NBN changes in the absorption coefficient of $\Delta \alpha_{NBN} < 0.3 $ / cm ($\approx \alpha/2000$). The implication of these results on proposed CDW properties and NBN mechanisms are discussed.

Download Full-text

Lateralization of Narrow-Band Noise by Blind and Sighted Listeners

Perception ◽

10.1068/p3338 ◽

2002 ◽

Vol 31 (7) ◽

pp. 855-873 ◽

Cited By ~ 12

Author(s):

Helen J Simon ◽

Pierre L Divenyi ◽

Al Lotze

Keyword(s):

Narrow Band ◽

Lateral Displacement ◽

Spatial Hearing ◽

Binaural Hearing ◽

Center Frequency ◽

Intensity Difference ◽

Sensation Level ◽

Individual Subject ◽

Narrow Band Noise ◽

Band Noise

The effects of varying interaural time delay (ITD) and interaural intensity difference (IID) were measured in normal-hearing sighted and congenitally blind subjects as a function of eleven frequencies and at sound pressure levels of 70 and 90 dB, and at a sensation level of 25 dB (sensation level refers to the pressure level of the sound above its threshold for the individual subject). Using an ‘acoustic’ pointing paradigm, the subject varied the IID of a 500 Hz narrow-band (100 Hz) noise (the ‘pointer’) to coincide with the apparent lateral position of a ‘target’ ITD stimulus. ITDs of 0, ±200, and ±400 μs were obtained through total waveform delays of narrow-band noise, including envelope and fine structure. For both groups, the results of this experiment confirm the traditional view of binaural hearing for like stimuli: non-zero ITDs produce little perceived lateral displacement away from 0 IID at frequencies above 1250 Hz. To the extent that greater magnitude of lateralization for a given ITD, presentation level, and center frequency can be equated with superior localization abilities, blind listeners appear at least comparable and even somewhat better than sighted subjects, especially when attending to signals in the periphery. The present findings suggest that blind listeners are fully able to utilize the cues for spatial hearing, and that vision is not a mandatory prerequisite for the calibration of human spatial hearing.

Download Full-text