| 摘要 |
A bit allocation method of a subband coding includes a first step of calculating a number of bits bf[m] needed for quantization for each block having q samples of each subband signal, a second step of selecting a subband jm having the largest needed number of bits bf[m], replacing needed number of bits bf[jm] with a value obtained by subtracting one from the needed number of bits bf[jm], replacing allocated number of bits ab[jm] with a value obtained by adding one to the allocated number of bits ab[jm], and replacing the available total number of bits TB with a value obtained by subtracting one from the total number of bits TB allocable to entire blocks, a third step of returning to the second step when available total number of bits TB is greater than or equal to one by checking the available total number of bits TB, and a fourth step of replacing the allocated number of bits ab[m] with a value obtained by subtracting one from the allocated number of bits ab[m], replacing the available total number of bits TB with a value obtained by adding the number of subbands K whose allocated number of bits ab[m] is one to the available total number of bits TB, and returning to the second step, when the presence of a subband whose allocated number of bits ab[m] equals one is checked under the state that the available total number of bits TB is below one. Thus, by single-bit incrementation during bit allocation, the hardware can be simplified. <IMAGE> |
