| 摘要 |
The present invention is concerned with a digital signal encoding apparatus in which the input digital signal has its frequency range divided into a number of frequency bands so that the bandwidths will be broader towards the frequency bands of higher frequencies, a first allowable noise level based on the energies on the band-by-band basis, and a second allowable noise level based on the energies of the signals timely adjacent to the signals of the frequency band under consideration, are set, and in which signal components of each frequency band are quantized with the number of bits corresponding to the level of the difference between an output synthesized from the first and the second noise levels and the energy of each frequency band. In this manner, the bit rate may be lowered while the deterioration in the sound quality is minimized.
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