2. Apply fb2k's scan per-file tack gain to avoid clipping and too low volume.3. Create "A" sample(s) by using fb2k's diskwriter, 24/96 resolution, trackgain used.
Quote2. Apply fb2k's scan per-file tack gain to avoid clipping and too low volume.3. Create "A" sample(s) by using fb2k's diskwriter, 24/96 resolution, trackgain used.Is this step necessary? It could possibly introduce some degradation on both files created (A and B), thus maybe reduce the perceivable difference between them.There is not much reason to listen to file A instead of the original, outside this test, anyway.
Will the 8 bits dithering remove all informaton ? Won't there be some info still audible below the dither noise ? I think it's safer to go through a real 16 bits step.
If you have trouble finding samples I can get them easily. Just call
If you have trouble finding samples I can get them easily. Just call.
Someone would need to try some test files to check that everything is in order before carrying out the test.
As it has been stated in this thread, it should be impossible to hear filter ringing with fc beyond human hearing. This is INCORRECT. It might be tempting to think so. The human hearing cannot hear steady-state sines over 20kHz. This has been concluded in millions of hearing tests all over the world. However, when listening to impulse responses, we have to take into account what is analyzing these sounds. The human ear has its own set of filters, analysis windows. Analyze a long enough impulse response with an auditory model and you will find that these filters are indeed triggered. This is why we can hear steepness of filters even when fs=96kHz and fc=47kHz.
(I don't provide it unless someone here knows a source for lossless high resolution samples)
You do need to resample to 44.1kHz, and then back again. The reason is because the quantisation noise is spread evening across the bandwidth of the signal.
It's kind of hard to get 24/96 samples if you are no audio engineer as DVD-A isn't rippable at full resolution so far (or have I missed something?).
It will take me a couple of days (I fetched too many CDs - over my quotum for this week...), then I'll try to get some good ones.
I have some ideas about what samples to use and what to look for:...any other useful samples?
I've found 2 short 24/96 samples:http://188.8.131.52/product/reference/keys.wavhttp://184.108.40.206/product/reference/triangle-2.wav
Remember - IIRC those DVD-V discs with 24/96 audio on them have no copy protection at all - I think you should encourage people who release things like this by buying their products, not copying them. What's more, Chesky is a great campaigner for having digital outputs put into DVD-A players - something the majors have said shouldn't happen.