Audio signal encoding apparatus and method

Details Audio signal encoding apparatus and method Audio signal encoding apparatus and method

2007-05-16

2009-11-03

Abebe, Daniel D (Department: 2626)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

C704S222000, C704S229000, C375S240220

Reexamination Certificate

active

07613605

ABSTRACT:
An audio signal encoding apparatus includes a frame dividing unit (1), an auditory psychological arithmetic unit (2), a filter bank unit (3), a scale factor calculation unit (4) which weights the spectra in the respective frequency bands by an arithmetic result of the auditory psychological arithmetic unit (2), a quantization step determination unit (7) which determines a quantization step of the entire frame prior to spectrum quantization by subtracting an information size of all quantized spectra from an auditory information size of all the weighted spectra before quantization, and multiplying the difference by a coefficient obtained from a step width of a quantization coarseness, a spectrum quantization unit (8), and a bit shaping unit (9) which outputs a bitstream obtained by shaping quantized spectra. The quantization step determination unit predicts the information size of all the quantized spectra based on a bit size assigned to a frame to be encoded.

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