That’s just word word salad.. you can’t even find what it actually is supposed to do..
I have sent
@amirm an old Denon ALPHA processor which will let him enable and disable the feature as well as Denon's old test tracks used to demonstrate the feature. This will let him take objective measurements but based upon the backlog, it may be Nov or Dec before he can test the claims and compare it to modern DACs. It's a lot of work for him.
ALPHA looks at the audio data in blocks and supposedly was tuned using Nippon Columbia’s own classical music recordings in the past. ALPHA is supposed to make educated guesses about
1) roll off filter. It’s similar to the old PMD100. We have fast roll off, slow roll off, etc. Here the Alpha processor should pass transients when appropriate to prevent pre and post ringing. Most slow roll-off filters have consequences of Figure 6 and Most fast filters have consequences of Figure 2. ALPHA is supposed to magically do what's needed based upon the music, so that you get the best of all worlds.
2)
Adaptive Line Pattern Harmonized Algorithm is a resampling algorithm that is supposed to work magic like Figure 7 through 10.
3) Although they demonstrate it with sine waves and oversampling/upsampling may generate the same performance, Denon had such confidence in ALPHA on real-world music in the 90's that they provided Track #13 on their test CD. This is normal classical music which is recorded at -50dB. (That's because real-world classical music dynamic range is around that level).
The thought is that with 16-bit dynamic range, the quiet passages were highly sensitive to DAC performance and ALPHA enhances this. By moving most of the music to this level, you can now compare the ALPHA processor against conventional DACs for an entire 4 minute music track.
4) The original ALPHA only worked for 16/44. AL32 Processing Plus is supposed to be enable these algorithms to 32-bit/192 kHz and the "Plus" is supposed to be better upsampling algorithm than the non-Plus. Since it's called AL32 instead of ALPHA32, there's no guarantee that today's receivers actually do the same types of calculations that the original ALPHA processing did. The old ALPHA processor had a physical chip that was the digital filter paired with a PCM-1702 or similar chip. Denon's AVRs claiming AL32 say that calculations are done with the DSP, but the DAC chips really aren't designed for external digital filters. No AVR has the "Plus" monicker, so it's also possible that the AL32 in AVRs and AL32 in hifi gear is dramatically different in implementation.
The questions that remain
a) Can Amir reproduce these showcase waveforms with ALPHA processing?
b) How do modern DACs from ESS and AKM handle these test tracks? Do all modern DACs have the same results? Again, this is only for 16/44.
c) Is any of this audible to his golden ears or measurable on real-world music beyond their test tracks?