• State Not Answered
  • Locked Locked
  • Replies 1 reply
  • Subscribers 9 subscribers
  • Views 6224 views
  • Users 0 members are here
2025 survey

We are running a survey to help us improve the experience for all of our members. If you see the survey appear, please take the time to tell us about your experience if you can.

Options
How was your experience today?
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

Is it a bug in NE10 library function "ne10_fir_float_neon"?

Robert

Hi,

I make a short test of NE10 library function ne10_fir_float_neon. I find that the first filter output data is always '1' for a simple impulse FIR (coefficients: 1, 0, 0, 0, 0). It is expected to be a 4 unit delay of input data.

const ne10_fir_instance_f32_t *S;
ne10_uint16_t     numTaps=5;   // Length of the filter.
ne10_float32_t pState[5]={1,0,0,0,0};   //   Points to the state variable array.
ne10_float32_t pCoeffs[5]={1,0,0,0,0};
ne10_fir_instance_f32_t tempS = {numTaps, pState, pCoeffs};
//tempS = {numTaps, pState, pCoeffs};
S = &tempS;
for (i = 0; i < 15; i++)
{
     printf ("neonfir1: thesrc[%d]= %f.\n", i, thesrc[i]);
     thedst1[i] = 0;
    printf ("neonfir1: thedst[%d]= %f.\n", i, thedst1[i]);
}
ne10_fir_float_neon (S, thesrc, thedst1, blockSize);
for (i = 0; i < 15; i++)
{
     printf ("neonfir2: thesrc[%d]= %f.\n", i, thesrc[i]);
    printf ("neonfir2: thedst[%d]= %f.\n", i, thedst1[i]);
}
ne10_fir_float_neon0 (S, thesrc, thedst1, blockSize);

Here is the printf output:

neonfir1: thesrc[0]= 1.676114.
neonfir1: thedst[0]= 0.000000.
neonfir1: thesrc[1]= 3.841148.
neonfir1: thedst[1]= 0.000000.
neonfir1: thesrc[2]= 1.388874.
neonfir1: thedst[2]= 0.000000.
neonfir1: thesrc[3]= 2.769850.
neonfir1: thedst[3]= 0.000000.
neonfir1: thesrc[4]= 2.386985.
neonfir1: thedst[4]= 0.000000.
neonfir1: thesrc[5]= 0.000000.
neonfir1: thedst[5]= 0.000000.
neonfir1: thesrc[6]= 0.000000.
neonfir1: thedst[6]= 0.000000.
neonfir1: thesrc[7]= 0.000000.
neonfir1: thedst[7]= 0.000000.
neonfir1: thesrc[8]= 0.000000.
neonfir1: thedst[8]= 0.000000.
neonfir1: thesrc[9]= 0.000000.
neonfir1: thedst[9]= 0.000000.
neonfir1: thesrc[10]= 0.000000.
neonfir1: thedst[10]= 0.000000.
neonfir1: thesrc[11]= 0.000000.
neonfir1: thedst[11]= 0.000000.
neonfir1: thesrc[12]= 0.000000.
neonfir1: thedst[12]= 0.000000.
neonfir1: thesrc[13]= 0.000000.
neonfir1: thedst[13]= 0.000000.
neonfir1: thesrc[14]= 0.000000.
neonfir1: thedst[14]= 0.000000.
neonfir2: thesrc[0]= 1.676114.
neonfir2: thedst[0]= 1.000000.
neonfir2: thesrc[1]= 3.841148.
neonfir2: thedst[1]= 0.000000.
neonfir2: thesrc[2]= 1.388874.
neonfir2: thedst[2]= 0.000000.
neonfir2: thesrc[3]= 2.769850.
neonfir2: thedst[3]= 0.000000.
neonfir2: thesrc[4]= 2.386985.
neonfir2: thedst[4]= 1.676114.
neonfir2: thesrc[5]= 0.000000.
neonfir2: thedst[5]= 3.841148.
neonfir2: thesrc[6]= 0.000000.
neonfir2: thedst[6]= 1.388874.
neonfir2: thesrc[7]= 0.000000.
neonfir2: thedst[7]= 2.769850.
neonfir2: thesrc[8]= 0.000000.
neonfir2: thedst[8]= 0.000000.
neonfir2: thesrc[9]= 0.000000.
neonfir2: thedst[9]= 0.000000.
neonfir2: thesrc[10]= 0.000000.
neonfir2: thedst[10]= 0.000000.
neonfir2: thesrc[11]= 0.000000.
neonfir2: thedst[11]= 0.000000.
neonfir2: thesrc[12]= 0.000000.
neonfir2: thedst[12]= 0.000000.
neonfir2: thesrc[13]= 0.000000.
neonfir2: thedst[13]= 0.000000.
neonfir2: thesrc[14]= 0.000000.
neonfir2: thedst[14]= 0.000000.

'thedst[0] should be 0, not 1.

0