ashishdash
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 Posted:
Sun Dec 11, 2005 5:15 pm Post subject:
INTFFT |
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hi i m a new member....had a doubt..i m trying to implement integer FFT..s
plzz can someone clear my doubt..
my doubt is how to find the optimal 16-bit representation for th
quantized lifting coefficients used in split radix 16-point FFT.
i will explain clearly.i have gone through a paper on INTFFT..i was abl
to analyse lifting schemes..but was not able to find the 16-bi
representation of a coeff.
The paper gave
MULTIPLIER lifting coeff*(2^15)
BinaryRepresenta
W(superscript 1)(subscript 16) -3227 -110010011011
6392
1100011111000
can some1 help me in analysing how did he get the value of lifting coef
as -3227 and 6392???i m getting as something as else...i found the valu
of lifting coefficients as (sqrt(2)-1) and (-1/(sqrt(2))) and i got th
value of lifting coeff*(2^15) as (0.414)*(2^15) and (-0.707)*(2^15) whic
is not matching with the given result. |
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