The purpose is to take advantage of the characteristics of arithmetic decoding and then to improve coding efficiency of codecs that provide the functionality of fine-grain scalability. The smart arithmetic decoding algorithm exploits the fact that a decoding buffer still contains meaningful information for arithmetic decoding even if we terminate decoding when there is no bit to be fed into the buffer. We tested the effect of the symbols additionally decoded from truncated MPEG-4 BSAC and MPEG-4 scalable lossless audio coding (SLS) bitstreams. On average, approximately additional 41 symbols and 13 symbols are uniquely decodable per frame in MPEG-4 BASC and MPEG-4 SLS respectively. The experimental results show that much less spectral difference and higher SNR with the smart arithmetic decoding. This additional “compression” can be effective when transmitting truncated bitstreams at lower bitrates.
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