Music Clip where lowpass 16 is obvious? Options

[guidryp]

I recently did a sweep test and I can easily hear past 20k (I don't have to turn up the volume or anything). But I had a hard time telling ff123's mustange clips Original from 15kHz cutoff.

I then encoded a some music at --lowpass 16 and could distinguish no loss of frequency.

Does anyone have a clip where the difference is blindly obvious to them. Lowpassing at 16 saves a lot of bits and if I can't tell the difference, why waste them? Perhaps my material does not make it obvious enough.

Peter

[guidryp]

Originally posted by JonPike


Check the "How high can you hear" thread on this board..

This came up,  and apparently you can get soundcard generated aliasing on very high freqencies,  that's probably what your hearing.    Possibly the sound program ff123 used might have generated some distortion as well..

I used Cool Edit 2000 to make a longer one for more accuracy,  and found similar noises,  but:  1. Bringing the sound level from 0db to -3db reduced them a lot,  2.  Changing from 44.1Khz sample rate to 48Khz made them completely inaudible.  This on a SB Audigy card.

Yes, that worked perfectly. Apparently my card handles 48KHz natively as well. The alaising is unreal on the ff123 44.1KHz sweep. Converting the sweep to 48 KHz also worked well. But I was able to get a real good idea of my hearing with a slow sweep and a big frequency plot.

I notice the first drop off right around 15KHz and it is silence by 16KHz.

Too bad about the aliasing since, most stuff seems to be in 44KHz.

Peter