Title :
A real-time IMT-2000 audio transmission system
Author :
Mori, Takeshi ; Kaneko, Takao ; Moriya, Takehiro ; Ikeda, Ken-ichi
Author_Institution :
NTT Cyber Space Labs., NTT, Tokyo, Japan
fDate :
11/1/2001 12:00:00 AM
Abstract :
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
Keywords :
audio coding; codecs; digital audio broadcasting; digital signal processing chips; error correction; land mobile radio; real-time systems; synchronisation; vector quantisation; 32 kHz; 64 kbit/s; TWINVQ; adaptive error concealment; audio compression; audio data; bit-errors; error sensitivity observations; fixed-point DSP chips; high-quality stereo audio samples; live concert broadcasting; next-generation mobile phone systems; portable real-time decoder; radio relaying; real-time IMT-2000 audio transmission system; real-time audio streaming services; real-time encoder; self-synchronization; transform-domain weighted interleave vector quantization; Audio compression; Bit rate; Decoding; Digital signal processing chips; Mobile handsets; Protection; Protective relaying; Radio broadcasting; Real time systems; Streaming media;
Journal_Title :
Consumer Electronics, IEEE Transactions on
