Inspired by REW I started working on a little DSP programming myself. I was reading lots of theory and actually I am pretty happy so far with first results of my little app. Overall the IRs done by the app seem to look pretty close to the ones done with REW, with few differencies which I dont understand so far.
First of all my IRs so far look much more noisy without filtering then the REW ones. Only when I do 1/48 smoothing in REW I get kind of same smooth results than REW delivers without?? smoothing?
Second I have differencies at low frequencies and strangly arround 7.2kHz, where REW seems to have a much more significant drop.
I tried few things that changed the overall picture little but not completely. When I told my app to calculate the IR with 60Hz/12db lowcut, I get closer to the REW result in the bass area, but still looks like there is kind of little sine wave in that part. trying different Tukey parametrs in my app did not bring me closer, too. I did all measurments with same mic position, same preamp, same Amp. All corrections (soundcard, mic) in REW where switched to "none".
Could you please have a look and give me a hint what is going wrong?/different? here.
First of all my IRs so far look much more noisy without filtering then the REW ones. Only when I do 1/48 smoothing in REW I get kind of same smooth results than REW delivers without?? smoothing?
Second I have differencies at low frequencies and strangly arround 7.2kHz, where REW seems to have a much more significant drop.
I tried few things that changed the overall picture little but not completely. When I told my app to calculate the IR with 60Hz/12db lowcut, I get closer to the REW result in the bass area, but still looks like there is kind of little sine wave in that part. trying different Tukey parametrs in my app did not bring me closer, too. I did all measurments with same mic position, same preamp, same Amp. All corrections (soundcard, mic) in REW where switched to "none".
Could you please have a look and give me a hint what is going wrong?/different? here.