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Exponential spectro-temporal modulation generation

Traditionally, real-time generation of spectro-temporally modulated noise has been performed on a linear amplitude scale, partially due to computational constraints. Experiments often require modulation that is sinusoidal on a logarithmic amplitude scale as a result of the many perceptual and physio...

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Detalles Bibliográficos
Autores principales: Stavropoulos, Trevor A., Isarangura, Sittiprapa, Hoover, Eric C., Eddins, David A., Seitz, Aaron R., Gallun, Frederick J.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Acoustical Society of America 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8097710/
https://www.ncbi.nlm.nih.gov/pubmed/33765775
http://dx.doi.org/10.1121/10.0003604
Descripción
Sumario:Traditionally, real-time generation of spectro-temporally modulated noise has been performed on a linear amplitude scale, partially due to computational constraints. Experiments often require modulation that is sinusoidal on a logarithmic amplitude scale as a result of the many perceptual and physiological measures which scale linearly with exponential changes in the signal magnitude. A method is presented for computing exponential spectro-temporal modulation, showing that it can be expressed analytically as a sum over linearly offset sidebands with component amplitudes equal to the values of the modified Bessel function of the first kind. This approach greatly improves the efficiency and precision of stimulus generation over current methods, facilitating real-time generation for a broad range of carrier and envelope signals.