Development of a communication system using audio signal using audible frequency bands

• Published in: The Journal of the Acoustical Society of America Vol. 140; no. 4; p. 3062
• Main Authors: Terayama, Chihiro, Niitsuma, Masahiro, Yamashita, Yoichi
• Format: Journal Article
• Language: English
• Published: 01-10-2016
• ISSN: 0001-4966; 1520-8524
• DOI: 10.1121/1.4969533

This paper proposes a technique of embedding information into audio signal to communicate using loudspeakers and microphones mounted on tablet-type devices. This technique is based on amplitude modulation for high audible frequency bands. The embedded information is represented by existence of sine waves with 11 different frequencies. In consideration of the frequency characteristics of tablet-type devices, two frequency bands to embed information, were chosen: (1) frequencies up to 12 kHz; (2) frequencies up to 16 kHz. The experimental result showed 85.9% of correct decoding in the case of (1), and 76.8% in the case of (2). Moreover, less audible noise was perceived in the case of (2).