Originally Posted by pioneer1070
Actually note that the DTS audio and AC3 is 20bit/96K not 16 bit. I can post a picture to back this. Ive seen a lot of wrong info...some people need to go do their home work.
I can assure you that there is no such thing as 96 kHz AC-3.
Since the LD format is 44.1 kHz PCM, there is no option for DTS 96/24 at all. It can only work on a 48 kHz-based system, like DVD.
Anyway, I'd love to see the picture.
As for 16 or 20 bits, this is a bit of irrelevance when it comes to lossy codecs. The actual wordlength is quite reduced by the encoder, to a few bits per band. The quantization noise remains inaudible because of gain scaling, bandlimiting and masking.
The DSPs that do the decoding used to be graded as being accurate to 16, 20 or 24 bits, below which was uncertainty or noise. Back in the mid '90s it was not yet common for DSPs to use extended precision calculations (>16 bits), but anything made in the last decade or so easily qualifies as the "20-bit" or better performance, so Dolby long ago dropped the decoder chip grading criteria.
The AC-3 encoders, from day 1, have always treated the source PCM as if it were 24 bits. The only thing that has changed over the years is that while DD on LD was 384 kbps, DVD raised it to 448 kbps, and now Blu-ray usually uses DD at 640 kbps.Edited by Roger Dressler - 5/27/13 at 5:01pm