Originally Posted by tiggers
For those of use less educated on the ripping tools/graphs (me
) can you explain the scales/graphs? To me it looks like the CD version of 'death on two legs' is a better copy than the DVDA.
Yes, it does, doesn't it.
Each graph shows two 'black rectangles' with green waveforms in them, left channel is the green trace on top, and right channel on bottom.
The x-axis is time, the y axis is sample level with respect to digital full-scale (0dB ) and 'infinity' (perfect silence -- that is the grey line bisecting each channel) .
So, If the waveform (the green stuff) touches the top or the bottom of its 'black rectangle', those are the timepoints in the track where it has reached maximum digital level (you can say maximum loundess, thought that's not quite correct). The more time the green stuff spends near these limits, the more limited its dynamic range is.
Notice that the Cobham and Young traces only send out very thin 'feelers' to these limits, with significant black space around them, with most of the solid reen well below them; this is good old-fashioned mastering to preserve dynamic range (that's what 'resolution' translates to in digital world) .
Notice that as I went from the Yes to the Queen, the solid green part of waveform got wider and/or blockier, with few 'feelers' until parts of the Queen track look almost like 'bricks' of green.
Where the waveform actually looks 'shaved flat' on top or bottom, there may be digital clipping going on. This is bad modern mastering where every moment is almost as loud as every other moment. Great for listening in noisy environments, though.