On the DPCM compression of Gaussian autoregressive sequences

Author

Guleryuz, Onur G. ; Orchard, Michael T.

Author_Institution

Dept. of Electr. Eng., Polytech. Univ. of Brooklyn, NY, USA

Volume

47

Issue

3

fYear

2001

fDate

3/1/2001 12:00:00 AM

Firstpage

945

Lastpage

956

Abstract

Differential pulse-coded modulation (DPCM) encoding of Gaussian autoregressive (AR) sequences is considered. It is pointed out that DPCM is rate-distortion inefficient at low bit rates. Simple filtering modifications are proposed and incorporated into DPCM. A rate-distortion optimization framework that results in optimal filters is presented. It is shown that the designed filters take advantage of “less significant” process spectral components in order to achieve superior rate-distortion performance. Design equations are derived, issues related to optimization and complexity addressed. It is shown that simple DPCM systems with the proposed modifications significantly outperform their standard counterparts

Keywords

Gaussian processes; autoregressive processes; computational complexity; data compression; differential pulse code modulation; digital filters; modulation coding; optimisation; rate distortion theory; sequences; AR sequence; DPCM compression; Gaussian autoregressive sequences; complexity; design equations; differential pulse-coded modulation encoding; filtering modifications; less significant process spectral components; optimal filters; rate-distortion optimization framework; rate-distortion performance; Bit rate; Decoding; Design optimization; Encoding; Equations; Filtering; Filters; Pulse compression methods; Pulse modulation; Rate-distortion;

fLanguage

English

Journal_Title

Information Theory, IEEE Transactions on

Publisher

ieee

ISSN

0018-9448

Type

jour

DOI

10.1109/18.915650

Filename

915650