Dear Sir,
I am Shashank, fresher to DSP field. Sir I was going through your fixed point
echo
cancellation module , here I am not getting the computation of RER in the fixed
point. The lower bound computation for the same in floating point is having the
error energy term but when I tried to solve the same equation for fixed point I
did not get the equation implemented in code, the term used in the LHS of the
(b)
if condition is equivalently modified to (RER * See) in fixed point, but I am
not
clear with RHS computation of the same in equation equation (f) and the
corresponding comparisons.
RER = (.0001*Sxx + 3.*MULT16_32_Q15(st->leak_estimate,Syy)) / See; - a
if (RER < Sey*Sey/(1+See*Syy)) ---------------------------------- b
tmp32 = MULT16_32_Q15(st->leak_estimate,Syy);----------------------- c
tmp32 = ADD32(SHR32(Sxx,13), ADD32(tmp32, SHL32(tmp32,1)));------ d
{
spx_float_t bound = PSEUDOFLOAT(Sey);------------------------- e
bound = FLOAT_DIVU(FLOAT_MULT(bound, bound),
PSEUDOFLOAT(ADD32(1,Syy)));-------- f
if (FLOAT_GT(bound, PSEUDOFLOAT(See)))------------------------ g
tmp32 = See;
Waiting for your reply...
Thank You in advance
With Regards
Shashank V K
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