"Miami Vice: Unrated Director's Edition" DD+ HD DVD
1. Chap 2 (0:14:53)
2. Chap 2 (0:14:56)
3. Chap 2 (0:15:00)
4. Chap 2 (0:15:07)
5. Chap 3 (0:23:45)
6. Chap 15 (1:46:02 - 1:46:07)
7. Chap 18 (2:03:33)
"Training Day" TrueHD HD DVD
1. Chap 3 (0:08:40 - 0:09:05)
2. Chap 23 (1:39:14)
3. Chap 23 (1:39:48)
4. Chap 23 (1:39:50)
5. Chap 23 (1:40:02)
6. Chap 23 (1:40:38)
The charts are pictures of the sound spectrum in a movie over a certain time period. The person making the graph "records" the sound during playback of part of the movie. The numbers on the top indicate the frequency of the sound recorded, and the colours represent the level of the sound (in increasing order, blue, green, yellow, orange, red, pink, magenta. maroon, purple). The graphs are presented with the start of the recording period at the bottom of the graph, and the end of the recording at the top.
These are often used to show at what frequency the bass sounds in a soundtrack occur. For example, if a portion of a movie has a pink blob at 20 Hz on the graph, that indicates that there is a very loud 20 Hz component to the sound during that part of the movie, and that a reasonably good subwoofer is required to be able to play that back.
Originally Posted by Jesse S
As per the HTF thread, these are the settings I use in Speclab:
-48kHz or 44.1kHz sample rate
-waterwall scroll interval 120ms
-fft input size 16384
-decimate input by 8
-freq. range 0Hz-120Hz
The coloration should be approximately blue for -70db and pink for 0db.
The color scale doesn't have to be exactly X and Y, if anything it's more important to include your scale in the pictures as a reference. I just wish there was an automated way to include screenshots along with the plot.
Q: Can you simply pop in a DVD and play it in the background with MediaPlayer, then run Spectrum Lab to analyze the sound? Or do you have to do something funky like route the line-out from your sound card to the line-in?
A: Yes, but it plots all channels when you play disc in the background
Since we are only plotting LFE I unplug the rca from the sub and connect it to the line in on the souncard
Q Do you need any plugins for Spectrum Lab to analyze the DD/DTS sound or does it work with the standard install?
A: No, it works with the standard install
Originally Posted by Krazykaj
I got very involved with the waterfall charts over at the HT forums (I'm "Kaj" in the waterfall thread, and come in about the middle or the topic with my collection of waterfall charts)
I've been looking quickly through this thread, and thought I just might mention to those doing these new charts, that you need to watch how you work with your 'monitoring' levels, and compare apples with apples, especially if you are using a PC for the media source.
Movies are NOT (unfortunately) all equal in their sound levels. Movie 'A' might have dialogue (a reference level) at -15db, where-as movie 'B' may have dialogue at -5db.
Some movies are mixed much, much louder than other movies. So if you are leaving all your settings (volume levels etc.) the same on your audio inputs when plotting the graphs for these different movies, you aren't keeping things the same for each movie.
That is why one movie will seem to have massive amounts of LFE in its waterfall chart, whereas another one will have (by comparison of graphs) hardly anything. However, in reality, if you 'turn up' the 'soft' movie (record it louder); OR 'turn down' the 'loud' movie (record it softer), you will see the results will make more sense.
A good measure of this is to get 'normal dialogue' in each movie to a certain SAME level, turning up OR down each movie, so that they are as similar as you can get them in real volume'.
If you don't 'standardize' the movies, you must let people know so that they read the waterfall charts INDIVIDUALLY. You cannot, should not compare the graph of one movie to another. Especially if you start to say "whao, this movie has much more bass than that other movie!!!"
It took me a while to realize this, because it always puzzled me, when I sat to watch movie 'A', it sounded really good, bass and all. Then when I watched movie 'B', it also sounded really good also, bass and all.
So I eagerly went to plot their waterfall graphs. . . However, when I plotted the waterfall charts, movie 'A' had plenty of deep red/pink (loud LFE) areas, but movie 'B' on the other hand, had only a splatter of those colours.
When I then went back to my HT, and played the movies again, I noticed on my Yamaha Z9, that for one movie, I was watching it at -18db, and for the other movie I was watching it a -9db.
So I when back, adjusted the volumes on my PC inputs accordingly (using, matching the dialogue as a reference) and re-plotted the graphs . . . voila, much more consistent results.
So yeah, for those making the graphs, it might be some food for thought (maybe not )
For those just looking at the charts, it might be something to keep in mind. Make sure you keep things in proportion.
Anyway, my 2c (disagree with me completely if you like)
Have fun ... I look forward to more charts,
Originally Posted by Krazykaj
Time is a precious commodity for me at the moment, but we'll see . . . I may get into the waterfall charts again, some time soon
I just hope that others may be encouraged to take up the challenge as well.
As a side note, regarding LFE in channels OTHER than the dedicated LFE channel.
There usually is quite alot of low bass present (down to 20Hz easy) in Front channels and even Rear channels. If fact, I've seen on occasion, where there is Low bass present in font channels that is NOT present at all in the LFE channel.
That's why Bass mangment is so important, because if not setup correctly, you will be missing alot of the bass. You are only getting the main 'boom' from the dedicated LFE channel, but missing all the rest that really makes the low end of audio sound so awesome.
Most normal speakers cannot do 90Hz/80Hz and down well. so if you have speakers like that, and all the mass of audio info is not being sent to your sub, you are loosing 50% of the audio.
(Which leads to a thought in regards to this thread ... I'd say, to do proper LFE waterfall charts, people should really be measuring the bass output of ALL channels (not just the sub), but that can get complicated )
Star Wars: Revenge of the SithDD-EX Chap 3, 7, 39, 40, 46
Originally Posted by kweezr
Revenge of the Sith, Chap 46
Originally Posted by George Montemayor
I think kweezr is sampling the LFE channel but with bass management. I demuxed the AC3 track from the DVD and converted it into multiple 16-bit WAV files and found the LFE channel alone to be unimpressive. The other channels, on the other hand, looked close to kweezr's results.
Originally Posted by kweezr
A few from Revenge of the Sith, remember these are LFE only plots.
Chap 3, flyby of the battlecruiser, FYI, this is the loudest bass scene through out the entire movie that I've been able to find
Chap 7, when Grevous ship crash lands
Chap 39, Yoda uses the force on Sidious
Chap 40, fight between Yoda and Sidious in the senate hall
They look pretty much the same, but there's difference in the way each sounds.
The original seems to be louder, when the the 2 hits the logo it has more rumble
then the newer. What make the new version stand out is the more refined feel of
the LFE and the use of the surrounds(which the original is lacking), you can feel
the 2 zoom by just before it hits.