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A real-time IMT-2000 audio transmission system

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4 Author(s)
Mori, Takeshi ; NTT Cyber Space Labs., NTT, Tokyo, Japan ; Kaneko, T. ; Moriya, T. ; Ikeda, K.

For real-time audio streaming services over next-generation mobile phone systems, such as live concert broadcasting and radio relaying, we have developed a realtime IMT-2000 audio transmission system. This system consists of a real-time encoder and a portable real-time decoder, which are both based on fixed-point DSP chips. TWINVQ technology is used for audio compression, and a scheme to protect audio data against bit-errors was designed based on error sensitivity observations. Self-synchronization and adaptive error concealment are carried out at the decoder. We confirmed that the system can transmit high-quality stereo audio samples at 32 kHz with a total bit rate of 64 kbit/s over a simulated IMT-2000 channel. We also checked that this system can connect to a real IMT-2000 experimental network, and found that it is easily applicable to various audio streaming services

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Consumer Electronics, IEEE Transactions on  (Volume:47 ,  Issue: 4 )