hifi audio coding technology based on wireless comunication

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[jaseela123d]

A sufficiently low bit rate Hi-Fi audio coding technique with a low computation designed to transmit high-quality real-time audio signal through a wireless channel. This technique applies the wavelet packet transformation to decompose the audio signal into subbands to eliminate redundant data using spectral and temporal masking properties. The encoded audio data is framed with some critical field protected by channel coding to improve noise immunity when frames are transmitted wirelessly. The experimental results show that transparent CD audio quality can be achieved at a bit rate encoding of 80 kbps. Moreover, the proposed technique still offers near CD audio quality when the frames are transmitted through AWGN channel with BER below 10-5. These encouraging results clearly show the superior features of our technique compared to others like Ogg / Vorbis and MP3, which are currently used today.


Although wireless communication has played a big role in our lifestyle, but to transmit high fidelity (a.k.a. hi-fi) wireless audio signal at a reasonable cost remains a challenge. Audio coding techniques currently available aim to reduce bit rate and put less concern for complexity and efficient wireless transmission. These audio CODECs like ISO / MPEG and Ogg / Vorbis are suitable for non-real-time applications and audio files. On the other hand, this research focuses on a technique of high-fidelity audio coding (near CD quality) that provides a sufficiently low bit rate and complexity (therefore, it can be processed in real time). In addition, the technique must tolerate noise (ie bit error rate - BER) on a wireless channel to a reasonable degree.