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A Hi-Fi Audio Coding Technique for Wireless Communication based on Wavelet Packet Tr - novyuva - 08-17-2017 Abstract This paper presents a sufficiently low bit rate Hi-Fi audio coding technique with low computation designed for transmitting real-time high-quality audio signal over wireless channel. This technique applies wavelet packet transform to decompose audio signal into subbands to eliminate redundant data using spectral and temporal masking properties. The encoded audio data is framed with some critical field is protected by channel coding to improve noise immunity when frames are transmitted wirelessly. Experimental results show that transparent CD-audio quality can be achieved at 80kbps encoding bit rate. Moreover, the proposed technique still offers near CD-audio quality when frames are transmitted over AWGN channel with BER below 10-5. These encouraging results clearly exhibit the superior features of our technique compared to others such as Ogg/Vorbis and MP3, which are ubiquitously employed nowadays. Keywords: hi-fi audio coding, wavelet packet transform. 1. Introduction Although wireless communication has played a great role in our lifestyle but to transmit high fidelity (a.k.a. hi-fi) audio signal wirelessly at a reasonable cost is still challenging. Presently available audio coding techniques aim to reduce bit rate and put less concern on complexity and efficient wireless transmission. Such audio CODECs like ISO/MPEG [1,2,3] and Ogg/Vorbis [4] are suitable for non real time applications and audio archive. On the other hand, this research focuses on a hi-fi (near CD quality) audio coding technique that provides sufficiently low bit rate and complexity (hence, can be processed in real time). In addition, the technique must tolerate the noise (i.e., bit error rate BER) in wireless channel at a reasonable degree. Current hi-fi audio CODECs employ entropy coding such as run-length and Huffman code [3,5,6], where important parameters required to decode are assumed to be error free. Otherwise, the frame will be discarded making it susceptible to noisy wireless channel. As a result, we identify such parameters and protect them using channel coding that can correct up to 29 bits (one of every seven bits). Perceptual coding technique is used reduce the bit rate based on human hearing masking property. In general, perceptual codec consists of five modules which are filer bank, psychoacoustic analyzer, bit allocation, quantizing and encoding, and framing, as shown in Figure 1. Figure 1 Structure of Perceptual Codec The output from filter bank (time/frequency analysis) is quantized according to masking thresholds calculated by the psychoacoustic analyzer. In [1,2] use polyphase filter bank which requires 512 coefficients to represent each filter. This can take significant time to encode the signal. In contrast, we use wavelet based filter bank to transform signal into wavelet domain that analyzes both time and frequency simultaneously. The filter bank uses fewer coefficients and can represent variable sized subbands that more accurately match the characteristic of non stationary audio signal [7]; human can only detect frequency difference at low or medium frequency. This hypothesis leads us to believe that the proposed technique should be simpler (can be implemented in hardware). Moreover, MATLAB experiments confirm that, at 80kbps, our wavelet packet audio codec yields comparable audio quality to that of the 64kbps MP3 and Ogg/Vorbis. It is worth noting that the higher bit rate of wavelet codec partially accounts for channel coding. This makes it wireless transmission ready. The rest of the paper is organized as follow: Section 2 elaborates on structure, function, and algorithm of the proposed wavelet packet audio codec. Experimental results are shown in Section 4. Section 5 concludes and presents future work. 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I'm J.DINESH RAO pursuing mt b.tech final year..i need a ppt about A Hi-Fi Audio Coding Technique for Wireless Communication based on Wavelet Packet Transformation. [email protected] A Hi-Fi Audio Coding Technique for Wireless Communication based on Wavelet Packet Tr - eproject - 08-17-2017 to get information about the topic Hi-Fi Audio Coding Technique for Wireless Communication based on Wavelet Packet Tra full report ,ppt and related topic refer the page link bellow http://seminarsprojects.net/Thread-a-hi-fi-audio-coding-technique-for-wireless-communication-based-on-wavelet-packet-tra |