Decoder Based Approach to Enhance Low Bit Rate Audio
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.
Click to purchase paper as a non-member or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!
This paper costs $33 for non-members and is temporarily free for AES members.