This paper presents a method of quantization to extract quantization parameters using the straight-line and DCT(Discrete Cosine Transform) for two split frequency bands. As the number of harmonics is various frame to frame, harmonics in low frequency ...
This paper presents a method of quantization to extract quantization parameters using the straight-line and DCT(Discrete Cosine Transform) for two split frequency bands. As the number of harmonics is various frame to frame, harmonics in low frequency band is oversampled to fix the dimension and straight-lines present a spectral envelope, then the discontinuous points of straight-lines in low frequency are sent to quantizer. Thus, extraction of quantization parameters using the straight-line provides a fixed dimension. Harmonics in high frequency use variable DCT to obtain quantization parameters and this paper proposes a method of quantization combining the straight-line with DCT. The measurement of proposed method of quantization uses spectral distortion(SD) for spectral magnitudes. As a result, the proposed method of quantization improved 0.3 dB in term of SD better than HVXC.