Sinusoidal amplitude modulation thresholds as a function of carrier frequency and level.

1996 ◽  
Vol 99 (4) ◽  
pp. 2566-2574 ◽  
Author(s):  
Ralf Fassel ◽  
Armin Kohlrausch
Keyword(s):  
Amplitude Modulation ◽  
Carrier Frequency ◽  
Sinusoidal Amplitude Modulation

The Response of Nonlinear Systems to Modulated High-Frequency Input

1993 ◽  
Author(s):  
S. A. Nayfeh ◽  
A. H. Nayfeh
Keyword(s):  
Nonlinear Systems ◽  
Natural Frequency ◽  
Amplitude Modulation ◽  
Carrier Frequency ◽  
High Frequency ◽  
Degree Of Freedom ◽  
Resonant Excitation ◽  
Single Degree Of Freedom ◽  
Single Degree ◽  
Different Types

Abstract We study the response of a single-degree-of-freedom system with cubic nonlinearities to an amplitude-modulated excitation whose carrier frequency is much higher than the natural frequency of the system. The only restriction on the amplitude modulation is that it contain frequencies much lower than the carrier frequency of the excitation. We apply the theory to different types of amplitude modulation and find that resonant excitation of the system may occur under some conditions.

scholarly journals Sound Design for Vocalizations: Quality in the Woods, Consistency in the Fields

The Condor ◽  
2000 ◽  
Vol 102 (1) ◽  
pp. 81-92 ◽  
Author(s):  
Timothy J. Brown ◽  
Paul Handford
Keyword(s):  
Long Range ◽  
Amplitude Modulation ◽  
Carrier Frequency ◽  
Sound Design ◽  
Habitat Types ◽  
Acoustic Adaptation ◽  
Acoustic Adaptation Hypothesis ◽  
Closed Habitat ◽  
Long Range Communication ◽  
Low Rate

AbstractThe acoustic adaptation hypothesis (AAH) predicts that vocalizations intended for unambiguous long range communication should possess amplitude modulation (AM) characteristics such that the temporal patterning of amplitude degrades less than alternative patterns during transmission through native habitat. The specific predictions are that open habitat signals should be structured as rapid AM trills, whereas closed habitat signals should be structured as low-rate AM tonal whistles. To investigate the benefit of trill- and whistle-structured signals in open and closed habitats, respectively, a high and low carrier frequency set of four synthetic signals which ranged from rapid AM trills to low rate AM whistles were transmitted 3 hours after sunrise through five different habitat types ranging from closed mature forest to open grassland. Results indicate that, on average, whistles degrade less than trills in both habitats. Trills benefit in open habitats through their tendency to be received with a more consistent quality than whistles. Such differences in transmission consistency among AM patterns are not found in closed habitats. While not degrading less on average, lower frequency signals are received with a more consistent quality than are higher frequency signals of the same AM structure, in both open and closed habitats.

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 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.

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