A method to improve the frequency characteristics in transition period for time-varying cosine modulated filter banks

Author

Wang, Guangyu

Author_Institution

Inst. for Network & Syst. Theor., Kiel Univ., Germany

Volume

1

fYear

1999

fDate

1999

Firstpage

365

Abstract

This paper presents an approach to improve the frequency characteristics in transition periods for time-varying cosine modulated filter banks. The prototype window is so designed that the total reconstruction distortion in presence of coefficient quantization is minimized. This leads to time-varying minimum mean square error (MMSE) cosine modulated filter banks. A suboptimal simplified window design method without directly minimizing the distortion equation is suggested. As an example a transform coding scheme for wideband speech and audio signals is given to show how to design the prototype window

Keywords

channel bank filters; data compression; mean square error methods; quantisation (signal); speech coding; time-varying filters; transform coding; coefficient quantization; distortion equation; frequency characteristics; minimum mean square error filter banks; suboptimal simplified window design method; time-varying cosine modulated filter banks; total reconstruction distortion; transform coding scheme; transition period; wideband speech signals; Design methodology; Equations; Filter bank; Frequency; Mean square error methods; Prototypes; Quantization; Speech coding; Transform coding; Wideband;

fLanguage

English

Publisher

ieee

Conference_Titel

Electronics, Circuits and Systems, 1999. Proceedings of ICECS '99. The 6th IEEE International Conference on

Conference_Location

Pafos

Print_ISBN

0-7803-5682-9

Type

conf

DOI

10.1109/ICECS.1999.812298

Filename

812298