c# - NAudio recording is somewhere filtering the high frequencies? -

i recording freqs 17k , try decode them goertzel filters.

i think nadio filtering high freqs although there no filters @ in program.

i recorded same sound file audacity , see fine spectrum.

now, same thing c# program kind of code of recording sound:

void mywavein_dataavailable(object sender, waveineventargs e)     {         mymemorystream.write(e.buffer, 0, e.bytesrecorded);//this playing mymemorystream         (int index = 0; index < e.bytesrecorded; index += 2)//here convert in loop stream floating number samples         {              short sample = (short)((e.buffer[index + 1] << 8) |                                     e.buffer[index + 0]);             samples32extended.add(sample);             samples32.add(sample / 32768f);//ieee 32 floating number          }     } 

then, generate binary file in order read in matlab see spectrum that:

float[] samples32array = samples32.toarray();         using(binarywriter writer = new binarywriter(file.open("c:/users/alon/desktop/myrecordings/myrecordbin.bin", filemode.create)))         {             foreach (var value in samples32array)             {                 writer.write(value);             }         } 

then, spectrum matlab that:

i don't have clue of happening.. must you.. thanks