首页>
外国专利>
EFFICIENT CODING OF DIGITAL AUDIO SPECTRAL DATA USING SPECTRAL SIMILARITY
EFFICIENT CODING OF DIGITAL AUDIO SPECTRAL DATA USING SPECTRAL SIMILARITY
展开▼
机译:利用谱相似度对数字音频谱数据进行有效编码
展开▼
页面导航
摘要
著录项
相似文献
摘要
Traditional audio encoders may conserve coding bit-rate by encoding fewer than all spectral coefficients, which can produce a blurry low-pass sound in the reconstruction. An audio encoder using wide-sense perceptual similarity improves the quality by encoding a perceptually similar version of the omitted spectral coefficients, represented as a scaled version of already coded spectrum. The omitted spectral coefficients are divided into a number of sub-bands. The sub-bands are encoded as two parameters: a scale factor, which may represent the energy in the band; and a shape parameter, which may represent a shape of the band. The shape parameter may be in the form of a motion vector pointing to a portion of the already coded spectrum, an index to a spectral shape in a fixed code-book, or a random noise vector. The encoding thus efficiently represents a scaled version of a similarly shaped portion of spectrum to be copied at decoding.
展开▼