Implementation of an adaptive transform decoder for high-quality audio on a 16-bit DSP chip

Author

Lovrich, Al

Author_Institution

Texas Instrument Inc., Houston, TX, USA

Volume

39

Issue

1

fYear

1993

fDate

2/1/1993 12:00:00 AM

Firstpage

40

Lastpage

44

Abstract

A real-time stereo digital audio decoder based on one 16-b digital signal processor (DSP) chip, implementing the decoder portion of an audio compression system, is described. The roundoff-sensitive portions of the decoder include pre multiplier and conventional inverse FFT operations, which have been efficiently coded with mixed-precision 16-b by 32-b multiplies with 32-b accumulations. Compared with a 16-b single-precision implementation, a moderate increase in DSP CPU utilization is incurred. Results indicate that the dynamic range of the 16-b DSP decoder is currently within 1 to 3 dB of the limitations imposed by high-quality 16-b A/D and D/A converters

Keywords

audio signals; codecs; data compression; digital signal processing chips; fast Fourier transforms; signal processing; 16 bit; DSP chip; adaptive transform decoder; audio compression system; digital signal processor; high-quality audio; inverse FFT operations; pre-multiplier operations; real-time; roundoff-sensitive portions; stereo digital audio decoder; Artificial intelligence; Audio compression; Decoding; Digital signal processing chips; Discrete transforms; HDTV; Instruments; Real time systems; Roundoff errors; Wideband;

fLanguage

English

Journal_Title

Consumer Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0098-3063

Type

jour

DOI

10.1109/30.199592

Filename

199592