Time signal analysis and derivation of scale factors

Details Time signal analysis and derivation of scale factors Time signal analysis and derivation of scale factors

2007-02-20

2007-02-20

Chen, Wenpeng (Department: 2624)

Image analysis

Image compression or coding

Quantization

C375S240100, C375S240290, C704S500000

Reexamination Certificate

active

10220651

ABSTRACT:
Analyzing an analysis time signal that has been generated from encoding and decoding and original time signal according to an encoding algorithm. The encoding block raster underlying the analysis time signal used by the encoding algorithm is determined. The analysis time signal is converted from its timely representation of analysis spectral coefficients to a spectral representation by using the established encoding block raster. At least two analysis spectral coefficients are grouped. The greatest common divisor of the analysis spectral coefficients are calculated, corresponding to the quantization step width used when quantizing the encoding algorithm or an integer multiple of it. In the case of an audio signal, the scale factor can easily be established for this group of spectral coefficients, i.e., for a scale factor band, from the quantization step width. All parameters used for the quantization of the original time signal are known; full iteration loops need not be performed.

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