Accuracy Constraint Determination in Fixed-Point System Design. (13th October 2008)

• Record Type: Journal Article
• Authors: Menard, D.; Serizel, R.; Rocher, R.; Sentieys, O.
• Other Names: Rupp Markus Academic Editor.
• Is Part Of: EURASIP journal on embedded systems. Volume 2008(2008)
• Publication Date: 2008-10-13
• Subjects: Embedded computer systems -- Periodicals; Systèmes enfouis (Informatique); Embedded computer systems; Periodicals; Electronic journals; 006.22
• DOI: 10.1155/2008/242584
• Languages: English
• ISSNs: 1687-3955

Abstract

Abstract : Most of digital signal processing applications are specified and designed with floatingpoint arithmetic but are finally implemented using fixed-point architectures. Thus, the design flow requires a floating-point to fixed-point conversion stage which optimizes the implementation cost under execution time and accuracy constraints. This accuracy constraint is linked to the application performances and the determination of this constraint is one of the key issues of the conversion process. In this paper, a method is proposed to determine the accuracy constraint from the application performance. The fixed-point system is modeled with an infinite precision version of the system and a single noise source located at the system output. Then, an iterative approach for optimizing the fixed-point specification under the application performance constraint is defined and detailed. Finally the efficiency of our approach is demonstrated by experiments on an MP3 encoder.