Abstract
Abstract Acoustic data transmission (ADT) forms a branch of the audio data hiding techniques with its capability of communicating data in short-range aerial space between a loudspeaker and a microphone. In this paper, we propose an acoustic data transmission system extending our previous studies and give an in-depth analysis of its performance. The proposed technique utilizes the phases of modulated complex lapped transform (MCLT) coefficients of the audio signal. To achieve a good trade-off between the audio quality and the data transmission performance, the enhanced segmental SNR adjustment (SSA) algorithm is proposed. Moreover, we also propose a scheme to use multiple microphones for ADT technique. This multi-microphone ADT technique further enhances the transmission performance while ensuring compatibility with the single microphone system. From a series of experimental results, it has been found that the transmission performance improves when the length of the MCLT frame gets longer at the cost of the audio quality degradation. In addition, a good trade-off between the audio quality and data transmission performance is achieved by means of SSA algorithm. The experimental results also reveal that the proposed multi-microphone method is useful in enhancing the transmission performance.
Highlights
Audio data hiding has been widely applied in many areas such as audio watermarking for copyright protection, steganography, covert communication, and broadcast monitoring [1,2]
6.1 Effect of modulated complex lapped transform (MCLT) length To examine what the effect of the MCLT length is on the performance of the proposed acoustic data transmission (ADT) system, we evaluated the transmission performance and audio quality for various MCLT lengths
7 Conclusions In this paper, we have proposed an ADT method based on audio data hiding which modifies and extends our previous works
Summary
Audio data hiding (or information hiding) has been widely applied in many areas such as audio watermarking for copyright protection, steganography, covert communication, and broadcast monitoring [1,2]. There have been a number of ADT schemes motivated by conventional audio watermarking techniques such as the spread spectrum [3,4,5] and echo hiding [6] These approaches, cannot support sufficient data rates to transmit text messages while providing good audio quality at the same time. In practical ADT, the received audio signal usually suffers from heavy attenuation at a certain frequency band or time frame due to the destructive interference of multi-path propagation and the spectral characteristics of the audio signal This phenomenon makes the ADT system fragile to background noises, and the transmission performance can be deteriorated. The message bit is embedded in L different MCLT coefficients with Llength spreading sequence to improve robustness of the data-embedded audio signal against channel effects and additive noise [20]. As L gets larger, the robustness of the system improves at the price of reduced bit rate
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