Scalable audio coder based on quantizer units of MDCT coefficients

A scalable codec has been constructed by using transform coding and the basic modules for scalable encoder and decoder, It allows users to choose a variety of scalable configrations in the frequency domain. The basic module is a quantizer that can quantize MDCT (Modified DCT)[1] coefficients transformed from a variety of frequency regions. This module mainly works at bitrates of more than 8 kbit/s. We can also change the target frequency regions of the basic module's input-output signals in each transform frame; i.e., we can change the scalable structure according to the nature of input signals. in the scalable codec described here, the input-output signals are monaural and the sampling frequency is 24 kHz. The total bit rate of this scalable codec is more than 8 kbit/s. Subjective quality evaluation tests, mainly for musical sound sources, showed that it's sound quality is better than that of an MPEG2-layer3 codec at 8, 16, and 24 kbit/s when our scalable codec is construced of 8-kbit/s basic modules.