Fixed-point optimization utility for C and C++ based digital signal processing programs

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Kim, Seehyun; Kum, Ki-Il; Sung, Wonyong
Issue Date
Institute of Electrical and Electronics Engineers (IEEE)
IEEE Trans. Circuits and Systems II: Analog and Digital Signal Processing, vol. 45, no. 11, pp. 1455-1464, Nov. 1998
Finite wordlength effectsfixed-point optimizationfixed-point simulationrange estimation
Fixed-point optimization utility software is developed
that can aid scaling and wordlength determination of
digital signal processing algorithms written in C or C++. This
utility consists of two programs: the range estimator and the
fixed-point simulator. The former estimates the ranges of floatingpoint
variables for purposes of automatic scaling, and the latter
translates floating-point programs into fixed-point equivalents to
evaluate the fixed-point performance by simulation. By exploiting
the operator overloading characteristics of C++, the range estimation
and the fixed-point simulation can be conducted by simply
modifying the variable declaration of the original program. This
utility is easily applicable to nearly all types of digital signal processing
programs including nonlinear, time-varying, multirate,
and multidimensional signal processing algorithms. In addition,
this software can be used to compare the fixed-point characteristics
of different implementation architectures. An optimization
example for an 8 8 inverse discrete cosine transform (IDCT)
architecture that conforms to the IEEE standard specifications is presented. The optimized results require 8% fewer gates when compared with the previous best implementation.
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Electrical and Computer Engineering (전기·정보공학부)Journal Papers (저널논문_전기·정보공학부)
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