A method to improve the PSNR of a perceptual audio coder is presented. It is based on the use of noise estimator at the decoder side to relate the quantization parameters and the quantization error. The quartic equation established contains two real roots, of which one of them is the desired spectral value. This value contains lesser quantization error compared to the de-quantized spectral value of a normal decoder. This leads to an improvement of up to 12 dB in SNR without significant increase in the decoder complexity.
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