Acoustic data transmission (ADT) forms a branch of the audio data hiding techniques with its capability of\ncommunicating data in short-range aerial space between a loudspeaker and a microphone. In this paper, we propose\nan acoustic data transmission system extending our previous studies and give an in-depth analysis of its performance.\nThe proposed technique utilizes the phases of modulated complex lapped transform (MCLT) coefficients of the audio\nsignal. To achieve a good trade-off between the audio quality and the data transmission performance, the enhanced\nsegmental SNR adjustment (SSA) algorithm is proposed. Moreover, we also propose a scheme to use multiple\nmicrophones for ADT technique. This multi-microphone ADT technique further enhances the transmission\nperformance while ensuring compatibility with the single microphone system. From a series of experimental results, it\nhas been found that the transmission performance improves when the length of the MCLT frame gets longer at the\ncost of the audio quality degradation. In addition, a good trade-off between the audio quality and data transmission\nperformance is achieved by means of SSA algorithm. The experimental results also reveal that the proposed\nmulti-microphone method is useful in enhancing the transmission performance.
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