This paper proposes a Low Power Spectral Band Replication algorithm (LP-SBR) adopted in the MPEG-4 Audio standard. It operates with low computational complexity compared to the conventional SBR algorithm called the High Quality SBR algorithm (HQ-SBR). LP-SBR utilizes real-valued processing instead of complex-valued processing used in HQ-SBR for complexity reduction. To minimize the sound quality degradation caused by this reduction, LP-SBR employs aliasing reduction techniques and a gain compensation technique. Subjective quality test results show that there is no statistical difference between LP-SBR and HQ-SBR when they are incorporated into AAC decoders. A complexity comparison of both SBR decoders implemented on 16-bit fixed-point DSPs shows that an AAC decoder with LP-SBR requires 30% less computational complexity than that with HQ-SBR.

Authors: Shimada, Osamu; Tanaka, Naoya; Tsushima, Mineo; Norimatsu, Takeshi; Kok Seng, Chong; Kim Hann, Kuah; Sua Hong, Neo; Nomura, Toshiyuki; Takamizawa, Yuichiro; Serizawa, Masahiro
Affiliations: NEC Corporation, Kanagawa, Japan ; Matsushita Electric Industrial Co. Ltd., Osaka, Japan ; Panasonic Singapore Laboratories Pte Ltd., Singapore(See document for exact affiliation information.)
AES Convention: 116 (May 2004) Paper Number: 6048
Publication Date: May 1, 2004
Subject: Low Bit-Rate Audio Coding

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