🚀 go-pugleaf

Yuhong Xiong (yuhong@hardy.u.washington.edu) wrote:
: I am currently working on coding MPEG audio algorithm on a fixed-point 
: DSP chip.  The original MPEG audio algorithm described in the Committee 
: Draft is a floating-point algorithm.  A lot of constant coefficients 
: are double precision numbers.  And in the psychoacoustic part of the 
: algorithm, the computation of logarithmic and exponential functions (base 10) 
: are required.  Can anybody tell me how to modify the MPEG audio algorithm 
: in order to fit into a fixed-point processor?  How to realize logarithmic 
: and exponential function on a fixed-point processor?  Or the general way 
: to convert a floating-point algorithm to fixed-point one.  Any information
: is appreciated.
: 
: Thanks in advance.
: 
: -Yuhong
: yuhong@u.washington.edu
:  
	I think it is an interesting problem to convert a floating point
precision program, eg, C-code, into fixed point computations. Since it
is the first step for converting algorithm to architecture. C-language 
do not support fixed point computation. Thus, there exists a big gap from
algorithm to architecture mapping. It is almost impossible to implement
multipliers or adders with floating point computation for real-time ASIC
solution. 
	So, the problem is: who should take the reponsibility of "Precision
Analyis". Architecture designer or algorithm developer? Or there are good
solutions to this problem.

eea78555@twins.ee.nctu.edu.tw