DVD-A Digital Sample for tigre
Reply #1 – 2004-03-07 23:36:07
Hi sayersc, welcome to Hydrogenaudio! Thanks a lot for your effort. I loaded your sample (beginning of Santana - Supernatural (05) Smooth) - with CoolEditPro. 1st I checked the 'silence' in the beginning of the track - there's a short part with 24bit LSB dither/noise = +/- 1 amplitude. But on the other hand there's no content > 20kHz in spectral view / frequency analysis besides a few clicks that are obviously (ripping?) errors. I own the CD version, unfortunately I can't find the CD right now, but the Musepack insane version is on my HDD, so I compared. Here's the frequency responses of DVD-A vs. CD version (same passage, volume adjusted, DVD-A version resampled to 44.1kHz, only left channel): Besides this, I noticed this: The CD version is recorded too loud as many recent pop CDs (replaygain values -7.5/-7.8dB), on basedrum hits there's heavy clipping (nearly horizontal line with ~ full scale sample values > 100 samples in a row). The 'DVD-A' version is amplified by ~ -5dB compared to the CD version but has almost the same horizontal lines ("almost", because the lines are somewhat smoothed, probably because of lowpass). Examples: or [/li][li]your DVD-A contains the same songs as DVD-V version (= video with AC3 or DTS audio stream) for compatibility reasons and you've ripped that one.[/li][/list][/li][/list]As the lowpass is easily audible you could try to check this (if you have a standalone DVD-A player) - compare playback through WinDVD + souncard with standalone DVD-A player playback (use same headphones /amp+speakers). Cheers tigre