A NEW INTENSITY STEREO CODING SCHEME FOR MPEG1 AUDIO ENCODER - LAYER-I AND LAYER-II

In MPEG I audio compression standard, the intensity stereo coding sche me is a keg, technology to achieve a bit rate lower than 2x128 kbit/s for stereophonic signals while preserving high audio quality. However, the intensity coding scheme has difficulties in signal cancellation a nd scalefactor consistency. This paper shows that the Karhunen-Loeve ( KL) transform can be applied to the intensity coding for solving the t wo problems. In this paper, we present true methods to implement the K arhunen-Loeve transform in the MPEG 1 layers I and II. Among the two m ethods, one is fully compatible with the MPEG1 while the other need a slight coding of modification on the MPEG coding process. All the conc lusion. two methods are tested to have better audio quality than the t echnique indicated by the MPEG 1 layers 1 and II.