Results 221 to 230 of about 1,158,243 (264)
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The detection of differences in the depth of frequency modulation
The Journal of the Acoustical Society of America, 1994Thresholds were measured for the detection of differences in the depth of 5-Hz frequency modulation (FM). In the first experiment, listeners detected differences between sequentially presented sinusoidal carriers. The Weber fractions for FM depth decreased from about 0.5 to about 0.3 as the baseline depth was increased from 2.5% to 20%, and were ...
Plack, C. J.; id_orcid 0000-0002-2987-5332 +1 more
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A frequency domain approach for fault detection
International Journal of Control, 2008This paper considers the use of online frequency response estimates for change detection, leading to fault detection and diagnosis. Spectral changes are detected as deviations in the frequency response, through the choice of a suitable observation variable.
Kin Fui Fong, Ai Poh Loh, Woei Wan Tan
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Mechanisms underlying the detection of frequency modulation
The Journal of the Acoustical Society of America, 2010Frequency modulation detection limens (FMDLs) were measured for carrier frequencies (fc) of 1000, 4000, and 6000 Hz, using modulation frequencies (fm) of 2 and 10 Hz and levels of 20 and 60 dB sensation level (SL), both with and without random amplitude modulation (AM), applied in all intervals of a forced-choice trial.
Stephan M A, Ernst, Brian C J, Moore
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Deep spatio-frequency saliency detection
Neurocomputing, 2021Abstract Despite the wide success in many vision tasks, it is still challenging for Convolutional Neural Networks (CNNs) to perform saliency detection due to their limited receptive fields and lack...
Zun Li 0001 +4 more
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The Journal of the Acoustical Society of America, 2008
A device for detecting a resonant frequency comprises a sound source, a switch, a mixer, and a sound meter. The switch and mixer are capable of switching between a first state in which the switch and mixer output a measurement signal and a second state in which the switch and mixer output a synthesized signal containing the measurement signal and the ...
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A device for detecting a resonant frequency comprises a sound source, a switch, a mixer, and a sound meter. The switch and mixer are capable of switching between a first state in which the switch and mixer output a measurement signal and a second state in which the switch and mixer output a synthesized signal containing the measurement signal and the ...
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Detection thresholds for sinusoidal frequency modulation
The Journal of the Acoustical Society of America, 1989An adaptive forced-choice procedure was used to measure, in four normal-hearing subjects, detection thresholds for sinusoidal frequency modulation as a function of carrier frequency ( fc, from 250 to 4000 Hz) and modulation frequency ( fmod, from 1 to 64 Hz).
L, Demany, C, Semal
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A time-frequency formulation of optimum detection
IEEE Transactions on Acoustics, Speech, and Signal Processing, 1988A time-frequency formulation is proposed for the optimum detection of Gaussian signals in white Gaussian noise. By choosing the Wigner-Ville distribution as the basic time-frequency tool, it is shown that the corresponding receivers generally take the form of a correlation between time-frequency structures, matching mathematical optimality with a ...
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Detection of combined frequency and amplitude modulation
The Journal of the Acoustical Society of America, 1992This article is concerned with the detection of mixed modulation (MM), i.e., simultaneously occurring amplitude modulation (AM) and frequency modulation (FM). In experiment 1, an adaptive two-alternative forced-choice task was used to determine thresholds for detecting AM alone.
B C, Moore, A, Sek
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Detecting causality between different frequencies
Journal of Neuroscience Methods, 2008Biological systems are usually non-linear and, as a result, the driving signal frequency (say, MHz) is in general not identical with the output frequency (say, N Hz). Coherence and causality analysis have been well-developed to measure the (directional) correlation between input and output signals with identical frequencies (N=M), but they are not ...
Jianhua, Wu +2 more
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SIGNAL DETECTION IN THE TIME-FREQUENCY PLANE
IFAC Proceedings Volumes, 1989Abstract Detection of a signal of known characteristics is generally achieved by means of techniques which operate either in the time domain or in the frequency domain. Keeping in mind situations fowhich temporal and spectral informations are simultaneously relevant (eg.
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