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Coding with improved time resolution for selected segments via adaptive block transformation of a group of samples from a subband decomposition
Coding with improved time resolution for selected segments via adaptive block transformation of a group of samples from a subband decomposition
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机译:通过子带分解中的一组样本的自适应块变换,为选定的片段编码提高的时间分辨率
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摘要
A transform coder is described that performs a time-split transform in addition to a discrete cosine type transform. A time-split transform is selectively performed based on characteristics of media data. Transient detection identifies a changing signal characteristic, such as a transient in media data. After encoding an input signal from a time domain to a transform domain, a time-splitting transformer selectively perform an orthogonal sum-difference transform on adjacent coefficients indicated by a changing signal characteristic location. The orthogonal sum-difference transform on adjacent coefficients results in transforming a vector of coefficients in the transform domain as if they were multiplied by an identity matrix including at least one 2×2 time-split block along a diagonal of the matrix. A decoder performs an inverse of the described transforms.
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