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Pierre-olivier Amblard - One of the best experts on this subject based on the ideXlab platform.
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Noise-aided processing: Revisiting dithering in a Sigma-Delta quantizer
IEEE Transactions on Signal Processing, 2005Co-Authors: Steeve Zozor, Pierre-olivier AmblardAbstract:In this paper we show that a particular Sigma-Delta quantizer, which is a strongly nonlinear dynamical system, can provide Noise-enhanced processing effects in some sense. In particular we will show that quantizing a sine, adding a small amount of Noise in the input, can improve the quantization process. In particular, the output local signal-to-Noise ratio exhibits a maximum when plotted against the Noise Amplitude.
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Stochastic Resonance in a Sigma-Delta quantizer
2003Co-Authors: Steeve Zozor, Pierre-olivier AmblardAbstract:Stochastic resonance is a phenomenon where a nonlinear system is able to make cooperate signal and Noise. In this paper we show that Sigma-Delta quantizers, that are strongly nonlinear dynamical systems, can provide stochastic resonance. The quantization can be improved by addition of a small amount of Noise to the signal to be quantized. In particular, the cross correlation between the signal and the reconstructed signal (resp. the mean square error) exhibit a maximum (resp. a minimum) when plotted against the Noise Amplitude.
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Can Stochastic Resonance be used in detection?
2000Co-Authors: Steeve Zozor, Pierre-olivier AmblardAbstract:This paper deals with stochastic resonance and its application in sine detection. The nonlinear physical phenomenon of stochastic resonance generally occurs in bistable systems excited by a random Noise plus a sine. Such systems force cooperation between the input Noise and the input sine: Provided a fine tuning between the Noise Amplitude and the dynamics, the system reacts periodically. The interesting fact is that the local output signal-to-Noise ratio presents a maximum when plotted against the input Noise Amplitude. In this paper we recall the main results for the discrete-time nonlinear AR(1) systems. We then show how stochastic resonance can be used to detect small noisy sine and that the classical incoherent detector can be improved in some non-Gaussian contexts.
Steeve Zozor - One of the best experts on this subject based on the ideXlab platform.
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Noise-aided processing: Revisiting dithering in a Sigma-Delta quantizer
IEEE Transactions on Signal Processing, 2005Co-Authors: Steeve Zozor, Pierre-olivier AmblardAbstract:In this paper we show that a particular Sigma-Delta quantizer, which is a strongly nonlinear dynamical system, can provide Noise-enhanced processing effects in some sense. In particular we will show that quantizing a sine, adding a small amount of Noise in the input, can improve the quantization process. In particular, the output local signal-to-Noise ratio exhibits a maximum when plotted against the Noise Amplitude.
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Stochastic Resonance in a Sigma-Delta quantizer
2003Co-Authors: Steeve Zozor, Pierre-olivier AmblardAbstract:Stochastic resonance is a phenomenon where a nonlinear system is able to make cooperate signal and Noise. In this paper we show that Sigma-Delta quantizers, that are strongly nonlinear dynamical systems, can provide stochastic resonance. The quantization can be improved by addition of a small amount of Noise to the signal to be quantized. In particular, the cross correlation between the signal and the reconstructed signal (resp. the mean square error) exhibit a maximum (resp. a minimum) when plotted against the Noise Amplitude.
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Can Stochastic Resonance be used in detection?
2000Co-Authors: Steeve Zozor, Pierre-olivier AmblardAbstract:This paper deals with stochastic resonance and its application in sine detection. The nonlinear physical phenomenon of stochastic resonance generally occurs in bistable systems excited by a random Noise plus a sine. Such systems force cooperation between the input Noise and the input sine: Provided a fine tuning between the Noise Amplitude and the dynamics, the system reacts periodically. The interesting fact is that the local output signal-to-Noise ratio presents a maximum when plotted against the input Noise Amplitude. In this paper we recall the main results for the discrete-time nonlinear AR(1) systems. We then show how stochastic resonance can be used to detect small noisy sine and that the classical incoherent detector can be improved in some non-Gaussian contexts.
Hamid R. Djalilian - One of the best experts on this subject based on the ideXlab platform.
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Loudness and acoustic parameters of popular children's toys.
International journal of pediatric otorhinolaryngology, 2015Co-Authors: Yaser Ghavami, Hossein Mahboubi, Kasra Ziai, Jay M. Bhatt, Marlon Maducdoc, Amy Y. Yau, Harrison W. Lin, Hamid R. DjalilianAbstract:This project was conducted to evaluate the loudness and acoustic parameters of toys designed for children. In addition, we investigated whether occluding the toys' speaker with tape would result in a significant loudness reduction; thereby potentially reducing the risk of Noise induced hearing loss.Twenty-six toys were selected after an initial screening at two national retailers. Noise Amplitudes at 0.25, 0.5, 1, 2, 4, and 8kHz were measured using a digital sound level meter at a distance of 0 and 30cm. The toys' speakers were then occluded using adhesive tape and the same acoustic parameters were re-measured.Mean maximum Noise Amplitude of the toys at 0cm and 30cm was 104dBA (range, 97-125dBA) and 76dBA (range, 67-86dBA), respectively. Mean maximum Noise Amplitude after occlusion at 0cm and 30cm distances was 88dBA (range, 73-110dBA) and 66dBA (range, 55-82dBA), respectively, with a p-value
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Systematic Assessment of Noise Amplitude Generated by Toys Intended for Young Children
Otolaryngology--head and neck surgery : official journal of American Academy of Otolaryngology-Head and Neck Surgery, 2013Co-Authors: Hossein Mahboubi, Sepehr Oliaei, Karam W. Badran, Kasra Ziai, Janice Chang, Shawn Zardouz, Shawhin Shahriari, Hamid R. DjalilianAbstract:OBJECTIVE: To systematically evaluate the Noise generated by toys targeted for children and to compare the results over the course of 4 consecutive holiday shopping seasons. STUDY DESIGN: Experimental study. SETTING: Academic medical center. SUBJECTS AND METHODS: During 2008-2011, more than 200 toys marketed for children older than 6 months were screened for loudness. The toys with sound output of more than 80 dBA at speaker level were retested in a soundproof audiometry booth. The generated sound Amplitude of each toy was measured at speaker level and at 30 cm away from the speaker. RESULTS: Ninety different toys were analyzed. The mean (SD) Noise Amplitude was 100 (8) dBA (range, 80-121 dBA) at the speaker level and 80 (11) dBA (range, 60-109 dBA) at 30 cm away from the speaker. Eighty-eight (98%) had more than an 85-dBA Noise Amplitude at speaker level, whereas 19 (26%) had more than an 85-dBA Noise Amplitude at a 30-cm distance. Only the mean Noise Amplitude at 30 cm significantly declined during the studied period (P < .001). There was no significant difference in mean Noise Amplitude of different toys specified for different age groups. CONCLUSION: Our findings demonstrate the persistence of extremely loud toys marketed for very young children. Acoustic trauma from toys remains a potential risk factor for Noise-induced hearing loss in this age group, warranting promotion of public awareness and regulatory considerations for manufacture and marketing of toys.
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Systematic Assessment of Noise Amplitude Generated by Toys
Otolaryngology–Head and Neck Surgery, 2012Co-Authors: Hossein Mahboubi, Sepehr Oliaei, Karam W. Badran, Saman Kiumehr, Hamid R. DjalilianAbstract:Objective: To systematically quantify the Amplitude of Noise generated by toys intended for young children.Method: From 2008 to 2011, greater than 200 toys intended for children under 5 years were screened for loudness. The toys with sound output of >80 dB were retested in a sound-proof audiometry booth. The generated sound Amplitude of each toy was measured at speaker level and at 30 cm away from the speaker.Results: Ninety different toys were analyzed. Mean Noise Amplitude peak at the speaker level was 99.5 dBA ± 8.1 SD (range, 80-121 dBA) and at 30 cm away from the speaker was 79.7 dBA ± 11.1 SD (range, 60-109 dBA). Eighty-one (90%) had more than 90 dBA Noise Amplitude at speaker level while 16 (22%) had more than 90 dBA Noise Amplitude at 30 cm distance. The mean Noise Amplitude of the loudest toys significantly decreased during the studied period (P < .001). There was no significant difference in mean Noise Amplitude of different toys specified for different ages.Conclusion: Our findings demonstrate ...
Eddy Simoen - One of the best experts on this subject based on the ideXlab platform.
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Gate length effect on the RTS Noise Amplitude in SOI MOSFETs
IEEE Electron Device Letters, 1996Co-Authors: Eddy Simoen, Cor ClaeysAbstract:The Random Telegraph Signal (RTS) Noise Amplitude in Silicon-on-Insulator MOSFETs is studied as a function of the gate length, by adding a second transistor in series. Different types of behavior can be distinguished, pointing toward a different origin of the related trapping centers. It is shown that in linear operation, the RTS Amplitude and the corresponding low-frequency Noise peak magnitude normally scales with 1/L. However, an increase with device length can also be found when the Noise peaks of two RTSs add up. For RTSs occurring in the saturation regime, a complete elimination is observed for larger Ls, in support of the supposed film-related origin.
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explaining the Amplitude of rts Noise in submicrometer mosfets
IEEE Transactions on Electron Devices, 1992Co-Authors: Eddy Simoen, B Dierickx, Corneel Claeys, G DeclerckAbstract:A simple-man's model for the random telegraph signal (RTS) Noise Amplitude in a submicrometer MOSFET is presented. It is shown that the channel resistance modulation for a specific trap can be expressed as a product of the normalized scattering cross section and of the fractional conductivity change. The model qualitatively describes the experimental temperature and drain current dependence of the RTS Amplitude and allows evaluation of the influence of the trap location and nature on the wide scatter in values observed. >
Ant Ural - One of the best experts on this subject based on the ideXlab platform.
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Temperature-dependent transport and 1/f Noise mechanisms in single-walled carbon nanotube films
Physical Review B, 2010Co-Authors: Ashkan Behnam, Amlan Biswas, Gijs Bosman, Ant UralAbstract:The temperature dependence of $1/f$ Noise and resistivity in single-walled carbon nanotube (CNT) films are studied. We find that as the temperature decreases, resistivity monotonically increases whereas $1/f$ Noise Amplitude first decreases, then increases, reaching a minimum at around 40 K. At temperatures considerably smaller than 40 K, the temperature dependence of both resistivity and $1/f$ Noise Amplitude can be explained by three-dimensional Mott variable-range hopping, which is due to localization effects that result in an insulating behavior in CNT films. At higher temperatures, on the other hand, the dependence of resistivity on temperature can be explained by fluctuation-induced tunneling. In this high-temperature regime, we analyze the temperature dependence of the Noise Amplitude to extract the density of fluctuators as a function of their energy. Our results show a characteristic peak between 0.3 and 0.6 eV that is responsible for the majority of $1/f$ Noise. We also find that, due to its correlation with the number of carriers, the Noise Amplitude is very sensitive to CNT film device dimensions, especially near the percolation threshold where the resistivity increases. These results not only provide fundamental physical insights about transport and $1/f$ Noise mechanisms in CNT films at different temperatures but also help assess the suitability of these films for device applications.