Banca de DEFESA: SHAYDINA DUARTE NEVES DA SILVA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : SHAYDINA DUARTE NEVES DA SILVA
DATE: 06/03/2023
TIME: 09:00
LOCAL: online
TITLE:

Computational Models for silence distribution in Soundscapes

KEY WORDS:

bioacoustics, soundscape, statistic models, ecology, statistic distributions

PAGES: 99
BIG AREA: Ciências Exatas e da Terra
AREA: Física
SUMMARY:

The soundscape, or acoustic landscape, is a concept that has received a great attention from ecologists, animal behaviorists and urban planners. The understanding and modeling of soundscape measurements in physics is still incipient. The duration of silence times in a soundscape is defined using a microphone and a typical sound intensity threshold; above the threshold, sound is perceived, below the threshold, silence is defined. In many soundscapes it was observed that the statistics of silence durations does not depend on the used threshold and follows a power law. In this dissertation, we build a null model for the statistics of silences: a microphone is placed in the center of a square matrix and sound emitters are randomly drawn in the matrix. Given a threshold, the sound is heard or not, depending on the sound intensity reaching the microphone. Assuming a squared decay of intensity and having all emitters the same power, only emitters within a critical radius are detected at the microphone. Under these conditions, the proposed model resembles a Bernoulli experiment, in which success consists of sound detection, and failure consists of inaudible sound at the microphone. The ratio between the area of the circle and the matrix defines the success probability of Bernoulli's experiment. Furthermore, the statistic between two successes follows a geometric distribution. Computer simulations confirm the theoretically established geometric distribution. Alternative tests with non-constant power have been performed, but the observed distribution in simulations is still a exponential type, and not a power law type.

COMMITTEE MEMBERS:
Interno - 1379465 - GILBERTO CORSO
Interno - 1753234 - GUSTAVO ZAMPIER DOS SANTOS LIMA
Interno - 1294916 - MADRAS VISWANATHAN GANDHI MOHAN
Externa ao Programa - 1863735 - RENATA SANTORO DE SOUSA LIMA - nullExterno à Instituição - ROBERTO ANDRÉ KRAENKEL