Indoor Localization Using Barely Perceptible Audio Signals

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João Moutinho
Diamantino Freitas
Rui Esteves Araújo

Abstract

This paper presents a new approach to an audio-based indoor localization system. By using audio signals emitted by a public address sound system, mobile devices may globally localize themselves in an indoor environment where global navigation satellite systems are not viable or reliable. The use of data hiding techniques such as spread spectrum coding or echo hiding has allowed to convey information to a receiver avoiding people’s perception of the added audio content. Results demonstrate a relatively quite good localization with centimetre accuracy and precision and successful data transmission using barely perceptible audio signals.

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Author Biographies

João Moutinho, INESC TEC

INESC TEC - INESC Tecnologia e Ciência

Campus da Faculdade de Engenharia da Universidade do Porto

Rua Dr. Roberto Frias

Edifício I

4200-465 PORTO

Portugal

Diamantino Freitas, Universidade do Porto

Departamento de Engenharia Eletrotécnica e de Computadores

Faculdade de Engenharia

Universidade do Porto

Rua Dr. Roberto Frias

4200-465 PORTO

Portugal

Rui Esteves Araújo, INESC TEC

INESC TEC - INESC Tecnologia e Ciência

Campus da Faculdade de Engenharia da Universidade do Porto

Rua Dr. Roberto Frias

Edifício I

4200-465 PORTO

Portugal