Detection and discrimination of second-order sinusoidal amplitude modulation (SAM)

2002 ◽  
Vol 111 (5) ◽  
pp. 2469
Author(s):  
Christian Füllgrabe ◽  
Christian Lorenzi
Keyword(s):  
Amplitude Modulation ◽  
Second Order ◽  
Sinusoidal Amplitude Modulation

Temporal dynamics of sinusoidal and non-sinusoidal amplitude modulation

2010 ◽  
Vol 32 (9) ◽  
pp. 1599-1607 ◽  
Author(s):  
Garreth Prendergast ◽  
Sam R. Johnson ◽  
Gary G. R. Green
Keyword(s):  
Amplitude Modulation ◽  
Temporal Dynamics ◽  
Sinusoidal Amplitude Modulation

scholarly journals Effects of second-order nonstationary cascaded processes on Gaussian beam propagation

1999 ◽  
Vol 17 (1) ◽  
pp. 119-128
Author(s):  
GUIDO TOCI ◽  
MATTEO VANNINI ◽  
RENZO SALIMBENI
Keyword(s):  
Gaussian Beam ◽  
Amplitude Modulation ◽  
Beam Propagation ◽  
Mode Locking ◽  
Second Order ◽  
Light Pulses ◽  
Perturbative Method ◽  
Stationary Conditions ◽  
Finite Aperture ◽  
Propagation Technique

This work proposes an analytical perturbative method describing the effects on the propagation of finite aperture beams due to the self-phase and self-amplitude modulation which result from cascaded second order interaction of ultrashort light pulses. The method merges the semi-analytical solution with a perturbative beam propagation technique, namely the Gaussian Beam Decomposition, which describes the effects of the non linear modulation on the free beam propagation. In particular we have studied the problem of the time- and intensity-dependent transmission of the pulse through slits or apertures placed along the path of the beam simulating a geometry suitable for passive laser mode-locking. Although an efficient pulse shortening action can be obtained in stationary conditions, in non stationary conditions the occurrence of an unavoidable amplitude modulation perturbs the beam propagation and reduces the temporal selectivity of the modulator.

scholarly journals Phonological awareness and sinusoidal amplitude modulation in phonological dislexia

2016 ◽  
Vol 74 (4) ◽  
pp. 293-298
Author(s):  
Yolanda Peñaloza-López ◽  
Aline Herrera-Rangel ◽  
Santiago J. Pérez-Ruiz ◽  
Adrián Poblano
Keyword(s):  
Phonological Awareness ◽  
Language Processing ◽  
Amplitude Modulation ◽  
Cross Sectional Study ◽  
Control Group ◽  
Regression Equations ◽  
Cross Sectional ◽  
Learning To Read ◽  
The Mean ◽  
Sinusoidal Amplitude Modulation

ABSTRACT Objective Dyslexia is the difficulty of children in learning to read and write as results of neurological deficiencies. The objective was to test the Phonological awareness (PA) and Sinusoidal amplitude modulation (SAM) threshold in children with Phonological dyslexia (PD). Methods We performed a case-control, analytic, cross sectional study. We studied 14 children with PD and 14 control children from 7 to 11 years of age, by means of PA measurement and by SAM test. The mean age of dyslexic children was 8.39 years and in the control group was 8.15. Results Children with PD exhibited inadequate skills in PA, and SAM. We found significant correlations between PA and SAM at 4 Hertz frequency, and calculated regression equations that predicts between one-fourth and one-third of variance of measurements. Conclusion Alterations in PA and SAM found can help to explain basis of deficient language processing exhibited by children with PD.

Effect of modulation maskers on the detection of second-order amplitude modulation with and without notched noise

2006 ◽  
Vol 119 (5) ◽  
pp. 2937-2946 ◽  
Author(s):  
Rosalie M. Uchanski ◽  
Brian C. J. Moore ◽  
Brian R. Glasberg
Keyword(s):  
Amplitude Modulation ◽  
Second Order
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