| 摘要 |
<p>An encoding apparatus which utilizes masking characteristics of channels for bit allocation in order to encode digitally sampled audio signals of at least two channels in units of an audio frame. The apparatus allocates the bits to the divided bands of the first and second channels, detects a channel in which the respective divided bands all have a masking to noise ration which exceeds a masking threshold the other channel. The encoding apparatus has a bit allocation portion (13A, 13B) for producing bit allocation information corresponding to each channel and bit ratio information between the channels, a first quantizer (14A) for receiving audio signals of the first channel divided bands and quantizing the received audio signal in response to the bit allocation information of the bit allocation portion (13A, 13B) to output the result, a second quantizer (14B) for receiving audio signals of the second channel divided bands and quantizing the received audio signal in response to the bit allocation information of the bit allocation portion (13A, 13B) to output the result, and a multiplexer (15) for multiplexing signals output from the first and second quantizers (14A, 14B), and the bit allocation information and the bit ratio information of the bit allocation portion (13A, 13B), to output the result, thereby providing an effect of improving sound quality even though an audio signal including many high frequency components may be reproduced. <IMAGE></p> |
