A new intensity stereo coding scheme for MPEG1 audio encoder-layers I and II

Author

Liu, Chi-Min ; Liu, Jen-Chang

Author_Institution

Dept. of Comput. Sci. & Inf. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan

Volume

42

Issue

3

fYear

1996

fDate

8/1/1996 12:00:00 AM

Firstpage

535

Lastpage

539

Abstract

In the MPEG 1 audio compression standard, the intensity stereo coding scheme is a key technology to achieve a bit rate lower than 2×128 kbit/s for stereophonic signals while preserving the high audio quality. However, the intensity coding scheme has difficulties in the signal cancellation and scale-factor consistency. This paper shows that the Karhunen-Loeve (KL) transform can be applied to the intensity coding for solving the two problems. We present two methods used to implement the Karhunen-Loeve transform in the MPEG 1 layers I and II. Among the two methods, one is fully compatible with the MPEG 1 while the other need a slight modification on the MPEG coding process. The two methods are tested and shown to have a better audio quality than the technique indicated by the MPEG 1 layers I and II

Keywords

Hi-Fi equipment; audio coding; code standards; telecommunication standards; transforms; 128 kbit/s; Karhunen-Loeve transform; MPEG 1 layer I; MPEG 1 layer II; MPEG1 audio encoder; bit rate; high audio quality; intensity stereo coding; scale-factor; signal cancellation; stereophonic signals; Audio compression; Auditory system; Bit rate; Computer science; Decoding; Frequency; Humans; Karhunen-Loeve transforms; Signal processing; Transform coding;

fLanguage

English

Journal_Title

Consumer Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0098-3063

Type

jour

DOI

10.1109/30.536153

Filename

536153