Acoustic OFDM: embedding high bit-rate data in audio

Authors:
Hosei Matsuoka;Yusuke Nakashima;Takeshi Yoshimura;Toshiro Kawahara
Affiliations:
Research Laboratories, NTT DoCoMo, Inc., Yokosuka, Kanagawa, Japan;Research Laboratories, NTT DoCoMo, Inc., Yokosuka, Kanagawa, Japan;Research Laboratories, NTT DoCoMo, Inc., Yokosuka, Kanagawa, Japan;Research Laboratories, NTT DoCoMo, Inc., Yokosuka, Kanagawa, Japan
Venue:
MMM'08 Proceedings of the 14th international conference on Advances in multimedia modeling
Year:
2008

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Abstract

This paper presents a method of aerial acoustic communication in which data is modulated using OFDM (Orthogonal Frequency Division Multiplexing) and embedded in regular audio material without significantly degrading the quality of the original sound. It can provide data transmission of several hundred bps, which is much higher than is possible with other audio data hiding tehcniques. The proposed method replaces the high frequency band of the audio signal with OFDM carriers, each of which is power-controlled according to the spectrum envelope of the original audio signal. The implemented system enables the transmission of short text messages from loudspeakers to mobile handheld devices at a distance of around 3m. This paper also provides the subjective assessment results of audio clips embedded with OFDM signal.