| 摘要 |
The embodiment of the present invention proposes a frequency domain envelope vector quantization method and apparatus, wherein the method comprises: dividing N frequency domain envelopes in one frame into N1 vectors, wherein each of the N1 vectors comprises M frequency domain envelopes; using a first codebook to quantize a first vector in the N1 vectors in order to obtain first vector-quantized code words, wherein the first codebook is divided into 2B1 portions; determining according to the first vector-quantized code words that the quantized first vector is associated with the i(th) portion in the 2B1 portions of the first codebook; determining a second codebook according to the codebook of the i(th) portion; and quantizing a second vector in the N1 vectors on the basis of the second codebook. In the embodiment of the present invention, on the basis that the frequency domain envelopes are divided into a plurality of vectors with fewer dimensions, the frequency domain envelope vectors can be vector-quantized using the codebooks with fewer bit numbers, therefore, not only can the complexity of vector quantization be reduced, but the result of vector quantization can also be ensured. Proposed are a frequency domain envelope vector quantization method and apparatus. The method comprises: dividing N frequency domain envelopes in one frame into N1 vectors, wherein each of the N1 vectors comprises M frequency domain envelopes; using a first codebook to quantize a first vector in the N1 vectors in order to obtain first vector-quantized code words, wherein the first codebook is divided into 2B1 portions; determining according to the first vector-quantized code words that the quantized first vector is associated with the i(th) portion in the 2B1 portions of the first codebook; determining a second codebook according to the codebook of the i(th) portion; and quantizing a second vector in the N1 vectors on the basis of the second codebook. On the basis that the frequency domain envelopes are divided into a plurality of vectors with fewer dimensions, the frequency domain envelope vectors can be vector-quantized using the codebooks with fewer bit numbers, therefore, not only can the complexity of vector quantization be reduced, but the result of vector quantization can also be ensured. |
