| 摘要 |
<p>Bit allocation to the sub-bands of a sub-band coding system is performed semi-adaptively by deciding on a bit allocation strategy on the basis of spectral envelope estimates derived from intermediate stages (41(1) and 41(2), 42(1) to 42(4)) of the filterbank (40) which divides the initial frequency band into the desired number of sub-bands. The invention has an application, for example, in 16 kBit/s digital speech transmission.</p> |
