The term perceptual audio coder refers to audio compression schemes that exploit the properties of human auditory perception. The idea is to allocate the quantization noise elegantly below the masking threshold to make it imperceptible to the ear. The process requires considerable computational effort, especially due to the psychoacoustics analysis and bit allocation-quantization process. This paper proposes a new method to simplify the psychoacoustics modelling process by adaptively reusing the computed masking threshold depending on the signal characteristics. The method also device a scheme to patch the potential spectral hole problems that might occur when the quantization parameters are reused. This proposal can be applied to generic stereo perceptual audio encoder where low computational complexity is required.
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