The Effect of Noise on the Accuracy of the Estimate of the Center Frequency of the Spectrum of a Narrow-Band Signal

2005 ◽  
Vol 48 (7) ◽  
pp. 711-717 ◽  
Author(s):  
V. S. Parshin ◽  
V. S. Gusev
Keyword(s):  
Narrow Band ◽  
Center Frequency ◽  
Band Signal

Lateralization of Narrow-Band Noise by Blind and Sighted Listeners

Perception ◽  
10.1068/p3338 ◽  
2002 ◽  
Vol 31 (7) ◽  
pp. 855-873 ◽  
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.

scholarly journals Improvement of description of finding out a narrow-band signal with a hindrance in frequency

2011 ◽  
Vol 1 (27) ◽  
Author(s):  
В.М. Шутко ◽  
Ю.М. Барабанов ◽  
C.Л. Квасюк
Keyword(s):  
Narrow Band ◽  
Band Signal

scholarly journals A procedure to correct the effects of a relative delay between the quadrature components of radar signals at base band

2005 ◽  
Vol 23 (1) ◽  
pp. 39-46
Author(s):  
◽  
La Hoz ◽  
◽  
Keyword(s):  
Radar Data ◽  
Center Frequency ◽  
Digital Receiver ◽  
The Real ◽  
Incoherent Scatter ◽  
Singular Region ◽  
Analysis Strategies ◽  
Relative Delay ◽  
Base Band ◽  
Band Signal

Abstract. The real and imaginary parts of baseband signals are obtained from a real narrow-band signal by quadrature mixing, i.e. by mixing with cosine and sine signals at the narrow band's selected center frequency. We address the consequences of a delay between the outputs of the quadrature mixer, which arise when digital samples of the quadrature baseband signals are not synchronised, i.e. when the real and imaginary components have been shifted by one or more samples with respect to each other. Through analytical considerations and simulations of such an error on different synthetic signals, we show how this error can be expected to afflict different measurements. In addition, we show the effect of the error on actual incoherent scatter radar data obtained by two different digital receiver systems used in parallel at the EISCAT Svalbard Radar (ESR). The analytical considerations indicate a procedure to correct the error, albeit with some limitations due to a small singular region. We demonstrate the correction procedure on actually afflicted data and compare the results to simultaneously acquired unafflicted data. We also discuss the possible data analysis strategies, including some that avoid dealing directly with the singular region mentioned above.

Masked discrimination of interaural time delays with narrow‐band signal

1982 ◽  
Vol 72 (6) ◽  
pp. 1821-1826 ◽  
Author(s):  
Yoshiko Ito ◽  
H. Steven Colburn ◽  
Carl L. Thompson
Keyword(s):  
Time Delays ◽  
Narrow Band ◽  
Band Signal
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