Informal subjective a / b listening tests indicated that the reconstructed speech quality of the improved wi codec with unquantized parameters is a little better than that of itu g . 726 32kbps adpcm coder 非正式的a b測試表明,改進的wi算法的模型質量好于itu32kbpsg . 726標準。
The quantized lp coefficients are replaced by the unquantized lp coefficients in the frequency domain expression of the feel weighted filter . the error signal has more similar envelope shape , and the hearing effect is better than before because the unquantized lp coefficients have more accuracy than quantized lp coefficients 由于未量化的線性預測系數具有更高的精度,因此,誤差信號通過修正后的感覺加權濾波器以后,具有與語音信號譜更加相似的包絡形狀,從而更好地利用共振峰對誤差的掩蔽效應,達到更佳的主觀聽覺效果。