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[Author] Hwan Sik YUN(2hit)

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  • Spectral Magnitude Adjustment for MCLT-Based Acoustic Data Transmission

    Hwan Sik YUN  Kiho CHO  Nam Soo KIM  

     
    LETTER-Information Network

      Vol:
    E95-D No:5
      Page(s):
    1523-1526

    Acoustic data transmission is a technique which embeds data in a sound wave imperceptibly and detects it at a receiver. The data are embedded in an original audio signal and transmitted through the air by playing back the data-embedded audio using a loudspeaker. At the receiver, the data are extracted from the received audio signal captured by a microphone. In our previous work, we proposed an acoustic data transmission system designed based on phase modification of the modulated complex lapped transform (MCLT) coefficients. In this paper, we propose the spectral magnitude adjustment (SMA) technique which not only enhances the quality of the data-embedded audio signal but also improves the transmission performance of the system.

  • Frame Splitting Scheme for Error-Robust Audio Streaming over Packet-Switching Networks

    Jong Kyu KIM  Jung Su KIM  Hwan Sik YUN  Joon-Hyuk CHANG  Nam Soo KIM  

     
    LETTER-Multimedia Systems for Communications

      Vol:
    E91-B No:2
      Page(s):
    677-680

    This letter presents a novel frame splitting scheme for an error-robust audio streaming over packet-switching networks. In our approach to perceptual audio coding, an audio frame is split into several subframes based on the network configuration such that each packet can be decoded independently at the receiver. Through a subjective comparison category rating (CCR) test, it is discovered that our approach enhances the quality of the decoded audio signal under the lossy packet-switching networks environment.