A fast algorithm for polyphase quadrature filters

Author

Christensen, Karl-Ejner ; Sorensen, E.

Author_Institution

Bang and Olufsen a/s, Struer, Denmark

Volume

42

Issue

12

fYear

1994

fDate

12/1/1994 12:00:00 AM

Firstpage

3513

Lastpage

3515

Abstract

A fast algorithm for computing the polyphase quadrature filters (PQF), which are typically used in data reduction of audio and speech signals, enables the implementation of either a larger number of subbands or a better data reduction method, or both, in real-time applications. The algorithm, which was developed for use in a hidden channel approach, has been implemented on a Motorola 56001 (27 MHz), where the fast algorithm enables practical use of more than 32 subbands on audio signals. As the number of calculations for M subbands is reduced from approximately M² to M log₂(M), a 64-band analysis or synthesis filter requires only about 22% of the computation capacity compared with approximately 43470 with other algorithms

Keywords

acoustic signal processing; audio signals; computational complexity; digital filters; discrete cosine transforms; speech processing; Motorola 56001; analysis filter; audio signal; computation capacity; data reduction; fast algorithm; hidden channel approach; polyphase quadrature filters; real-time applications; speech signal; subbands; synthesis filter; Algorithm design and analysis; Bandwidth; Computational complexity; Discrete cosine transforms; Filter bank; HDTV; Sampling methods; Signal processing algorithms; Signal synthesis; Speech;

fLanguage

English

Journal_Title

Signal Processing, IEEE Transactions on

Publisher

ieee

ISSN

1053-587X

Type

jour

DOI

10.1109/78.340785

Filename

340785