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Rayovac
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United States
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 Posted - 2010/02/01 : 21:01:38
I should note I get this on only about thirteen songs in my entire collection of music; basically it's akin to a reflection in the higher hertz range:
Other than that though, everything looks normal, even the waveform. They also have a distinctive muffled sound to them... it's hard to describe. Is there a name for what I'm observing?
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Rayovac
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Posted - 2010/03/02 : 23:54:10
Bump.
If it helps, I noticed that when I switch to linear, it IS a 'reflection.'
Normal:
Oddball track:
I should also note that the waveforms are NOT entirely normal, they seem to be "leaning" (look closely).
If no one can figure this out then I'm just going to email someone at the CCRMA. :P
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Lilley
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Posted - 2010/03/04 : 09:37:05
mate, what the hell are you talking about.
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TheOneNOnly
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Posted - 2010/03/04 : 10:48:48
quote:
Originally posted by Lilley:
mate, what the hell are you talking about.
This. All of this, with a little sprinkles, ah screw it, ALL the sprinkles.
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atomsk
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Posted - 2010/03/04 : 10:55:35
quote:
Originally posted by TheOneNOnly:
quote:
Originally posted by Lilley:
mate, what the hell are you talking about.
This. All of this, with a little sprinkles, ah screw it, ALL the sprinkles.
I even know what he is talking about... Look at th top of each spectrogram, the highest hertz like mirrors at the top
see it now?
I have no idea why this happens... And the "odd ball" and the other one...WTF are you talking about?
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Lilley
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Posted - 2010/03/04 : 11:08:11
ok, i think its a matter of understanding what I'm looking at. So is that black line a certain wavelength and everything above that a reflection of the below? Is that right? If so what wavelngth is the blackspot?
But I don't see anything noticable when you switch to linear. to me it just looks like you're saying the waveforms of the channels look the same. Well, so they should...
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Rayovac
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Posted - 2010/03/04 : 16:16:53
quote:
A spectrogram is an image that shows how the spectral density of a signal varies with time. Also known as spectral waterfalls, sonograms, voiceprints, or voicegrams, spectrograms are used to identify phonetic sounds, to analyse the cries of animals, and in the fields of music, sonar/radar, speech processing, seismology, etc. The instrument that generates a spectrogram is called a spectrograph or sonograph.
The most common format is a graph with two geometric dimensions: the horizontal axis represents time, the vertical axis is frequency; a third dimension indicating the amplitude of a particular frequency at a particular time is represented by the intensity or colour of each point in the image.
There are many variations of format: sometimes the vertical and horizontal axes are switched, so time runs up and down; sometimes the amplitude is represented as the height of a 3D surface instead of color or intensity. The frequency and amplitude axes can be either linear or logarithmic, depending on what the graph is being used for. For instance, audio would usually be represented with a logarithmic amplitude axis (probably in dB), and frequency would be linear to emphasize harmonic relationships, or logarithmic to emphasize musical, tonal relationships.
Also about the normal and oddball tracks... the normal track is a song without the 'reflection.' The oddball track is one with the 'reflection.' My point is that the 'reflection' is only somewhat apparent in logarithmic view, but in linear view it's completely there.
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Lilley
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Posted - 2010/03/04 : 21:03:14
I know what a spectogram is, just not sure about the reflections.
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Rayovac
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Posted - 2010/03/04 : 23:44:37
quote:
Originally posted by Lilley:
I know what a spectogram is, just not sure about the reflections.
Wasn't specifically aimed at you, just for anyone that has no idea what's going on. :)
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Lilley
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Posted - 2010/03/05 : 05:19:34
you're aiming it at me then, I still got no idea what reflections your talking about.
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Rayovac
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Posted - 2010/03/05 : 14:22:57
quote:
Originally posted by Lilley:
you're aiming it at me then, I still got no idea what reflections your talking about.
Does this help?
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Lilley
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Posted - 2010/03/05 : 17:19:30
I think so, your just saying the waveform (does it show volume or pitch?) is reflected about the origin? Which, if you think about it, should happen...
Also, I think it only looks like that because you are so zoomed out. go in closer and you will find it is not reflected at all but one smooth line the whole way.
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Edited by - Lilley on 2010/03/05 17:23:12 |
Rayovac
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Posted - 2010/03/05 : 21:31:41
quote:
Originally posted by Lilley:
I think so, your just saying the waveform (does it show volume or pitch?)
Wait what? It isn't much of a waveform to be honest... I mean, it's showing the energy and hertz levels. The brighter an area is, the more energy there is there (which can also be interpreted as volume). It doesn't really show pitch, but you can get a general hint of it if a sound is defined enough (like if you have a single loud square wave that plays on F# for two seconds, then moves up an octave for two seconds, it would show up, although that's a pretty extreme example).
quote:
Originally posted by Lilley:
is reflected about the origin? Which, if you think about it, should happen...
The point of origin here would be the bottom right of each channel in the graph, since that represents the lowest represented frequency and now (in time), in other words no, in the tracks with the reflection, that silent gap present isn't the origin.
quote:
Originally posted by Lilley:
Also, I think it only looks like that because you are so zoomed out. go in closer and you will find it is not reflected at all but one smooth line the whole way.
....??? It's the same "zoom" level for all. The 'reflection' is apparent in both logarithmic and linear view, but much more apparent in linear since the higher frequencies get more showtime.
Shanty & Distressed Frequencies - Forward Motion (Moving At 170 Mix) (Lossless flac file, 44100hz, stereo, bought from junodownload)
Simon Apex & Dair - Don't Stop Now (Lossless flac file, 44100hz, stereo, bought from trackitdown - note, not saying it's their fault or anything, or that it's been that way with more than one of the files)
^The top one is a recurring theme for all 'regular' tracks (ones without the reflection), although I should note that the non-lossless files don't go that high in terms of hz (there's an obvious point where it cuts off, thansk lossy formats). The bottom one is a recurring theme for all of the tracks with the reflections. I'm also pretty sure that a whopping majority of the 'reflection' is too high to hear.
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Edited by - Rayovac on 2010/03/05 21:34:04 |
Rayovac
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Posted - 2010/03/31 : 00:11:08
In regards to the waveform earlier, I found out that that's called DC offset. :P
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Dante
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Posted - 2010/03/31 : 01:02:28
And here I was thinking this would be about optics. Silly me.
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