We present in this paper a near-lossless full-band stereo compression scheme, Conditionally Lossless Encoding under Allowed Rates (CLEAR), aiming at its use in real-time transmission of sound data, sounds to be mixed or processed after transmitted. Using uniform quantizer with MPEG-4 Audio Lossless Coding (ALS) and adaptive pre- and post-processing, CLEAR controls the encoding bit rate with maximum fidelity of reconstructed signals. Objective experiments show an enhancement in signal to noise ratio (SNR) and from conventional low-delay codecs with compatible perceptual quality. Additionally, companding-based perceptual weighting designed for CLEAR is shown to make an improvement in Perceptual Evaluation of Audio Quality (PEAQ).
Sugiura, Ryosuke; Kamamoto, Yutaka; Harada, Noboru; Kawanishi, Takahito; Moriya, Takehiro
Affiliations: NTT Communication Science Laboratories, Nippon Telegraph and Telephone Corporation, Kanagawa, Japan; NTT Communication Science Laboratories, Kanagawa, Japan; NTT Communicatin Science Labs, Atsugi-shi, Kanagawa-ken, Japan; 1NTT Communication Science Laboratories, Nippon Telegraph and Telephone Corporation, Kanagawa, Japan; NTT Communication Science Labs, Atsugi-shi, Kanagawa-ken, Japan(See document for exact affiliation information.)
AES Convention: 143 (October 2017) Paper Number: 9899
Publication Date: October 8, 2017
Subject: Applications in Audio
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