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i just realized... (pg. 4)
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View this Thread in Original format
| whiskers |
| quote: | Originally posted by BTG
wow. you're penis is as big as mine! |
ha! i was just about to say that this thread is turning into a "my penis is bigger than yours thread"
well, i've got a ruler and a camera............ |
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| jon |
| quote: | Originally posted by DigiNut
Between MP3s and CDs though, there really is no difference if they've been ripped and encoded properly. |
mp3's dont contain all the high/low frequency sounds that would exist on a cd, and I did have a play on a mates hifi setup and i could notice the difference from a 192kbs mp3 and cd, though when i riped it at 320kbs i couldnt notice anything different then.
@'pr0digy what program are you running to get those text stats on your desktop? |
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| DigiNut |
| quote: | Originally posted by jon
mp3's dont contain all the high/low frequency sounds that would exist on a cd, and I did have a play on a mates hifi setup and i could notice the difference from a 192kbs mp3 and cd, though when i riped it at 320kbs i couldnt notice anything different then. |
Right, but how did you encode it? Did you rip with EAC, run a 20.5 kHz lowpass filter and use LAME on best quality? Or did you rip and encode it all at once with Audiocatalyst or MusicMatch Jukebox? |
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| Streakfury |
| quote: | Originally posted by BTG
I hate mp3s. they sound like .
that is all. |
MP3's cut out each sound frequency's upper harmonics, which mean the sound is blander, and more muffled. The more harmonics/overtones there are, the 'warmer' it sounds, but as MP3's are compressed, they cut half of them out. Boooo!
:p |
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| `pr0digy |
| quote: | Originally posted by jon
mp3's dont contain all the high/low frequency sounds that would exist on a cd, and I did have a play on a mates hifi setup and i could notice the difference from a 192kbs mp3 and cd, though when i riped it at 320kbs i couldnt notice anything different then.
@'pr0digy what program are you running to get those text stats on your desktop? |
A program called "coolmon", just google for it. The layout is custom made by moi. |
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| DigiNut |
| quote: | Originally posted by Streakfury
MP3's cut out each sound frequency's upper harmonics, which mean the sound is blander, and more muffled. The more harmonics/overtones there are, the 'warmer' it sounds, but as MP3's are compressed, they cut half of them out. Boooo!
:p |
I'll try one more time to make this clear. I know you all want to sound smart and sophiscated, but MP3s encoded with LAME at 192 kbps do not cut out any frequencies above 20 kHz (closer to 19.5 I guess). Only a select few can actually hear frequencies above this level, and very few sounds (i.e. tracks) actually contain frequencies above this level.
I can't remember if I posted this before, but here is a nice little frequency response graph. On top is a sample of white noise, which is Gaussian, random noise, containing frequency components across the entire spectrum. The graph below it is LAME 256 kbps, and below that is LAME 192 kbps. You can CLEARLY see that the infidelity only begins around 19.5 kHz. If you want to know just how high that frequency is, open Sound Forge or CoolEdit and generate a 20 kHz sine wave - if you can actually hear anything, it's going to be a very unpleasant, piercing sound.
I also haven't run any lowpass filters on the 192 kbps MP3. Nyquist worked out that if you sample at a frequency lower than 2x the highest frequency in the analog signal, you'll get aliasing distortion, which actually messes up OTHER frequencies in the signal that would normally be fine. So if you sample at 40 kHz and have a 21 kHz signal, you'll actually get additive components at 19 kHz. I know a lot of you probably have no clue what I'm talking about, but these are things you learn in DSP, and this is why you should always use a lowpass filter at around 20 kHz before encoding MP3s.
That's all for now. Try to learn something new, instead of teaching something old and incorrect (or half-true at best). |
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| DJ Chrono |
DigiNut, sometimes audio quality goes beyond known forms of scientific explanation.
Take solid state amplifiers for insance. Many people will argue that amplifiers differ in sound from one to another. Yet, there is no form of calculatable, measurable difference in the sound.
Same goes for audio cables. Some people swear they hear a difference in audio quality when a wire has been submerged in liquid nitrogen for 3 days before assembly. They are so sure they hear a difference that they spend $2,000 extra on that wire. Can that audio quality difference be measured or explained by any form of current science? No.
In order to find out for sure if mp3s do differ from cd audio, a single blind experiment could easily be preformed. Using high quality gear would be important though, in order to reveal ever detail and nuance in the sound.
I honestly don't know if mp3s encoded properly do sound the same as CD's.. but I wouldnt doubt that the encoding could change something else in the audio signal besides cutting the upper frequencies. |
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| DigiNut |
| quote: | Originally posted by DJ Chrono
DigiNut, sometimes audio quality goes beyond known forms of scientific explanation. |
*sigh*
This is almost as bad as the God discussions. Yes, it can't be proven by any known means of science, but I just *know* it's there... :rolleyes:
| quote: | | Take solid state amplifiers for insance. Many people will argue that amplifiers differ in sound from one to another. Yet, there is no form of calculatable, measurable difference in the sound. |
Yes, which I'm guessing is mainly because people like a certain brand, and thus convince themseles that what they're hearing is better. It's a folley though, do you think that same person would be able to identify the sound of that particular amp (as opposed to any other amp) if he heard it without being able to see it? Only in very rare cases, and those could still be flukes.
| quote: | | Same goes for audio cables. Some people swear they hear a difference in audio quality when a wire has been submerged in liquid nitrogen for 3 days before assembly. They are so sure they hear a difference that they spend $2,000 extra on that wire. Can that audio quality difference be measured or explained by any form of current science? No. |
Actually, I can explain that right here and now. Noise floor of a resistive load is proportional to its temperature: pn (noise power) = kTB, where k is Boltzmann's constant, T is the ambient temperature, and B is the signal bandwidth. The lower the value of T, the less noise is present, and hence, the higher the SNR and the better the sound quality.
| quote: | | In order to find out for sure if mp3s do differ from cd audio, a single blind experiment could easily be preformed. Using high quality gear would be important though, in order to reveal ever detail and nuance in the sound. |
Yes, and like I said before, those tests (double-blind tests, actually) have been performed, and the results were that less than 1% of people could tell the difference with a 192 kbps MP3, and absolutely 0 could tell the difference at 256 kbps and above.
| quote: | | I honestly don't know if mp3s encoded properly do sound the same as CD's.. but I wouldnt doubt that the encoding could change something else in the audio signal besides cutting the upper frequencies. |
Look at the graphs and see for yourself. There may be some minor variations, but they're generally less than 1 dB, and the human ear simply is not that sensitive to changes in amplitude. |
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| Stanza |
| quote: | Originally posted by DigiNut
MP3s encoded at 192 kbps or above are nearly identical to the original CD tracks in frequency spectrum.
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I would have to disagree with that.
I have quite a few number of mp3's encoded at 192 and I can really tell the differnec between the 2.
Cd's sound somewhat louder an more dynamic than mp3s |
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| Mr.Mystery |
I'll rather believe my own ears rather than your fancy graphs, DigiNut. A week ago I would had agreed with you but now that I got a new audio system I can clearly hear the difference between a mp3 (any rate) and cd audio. The louder I play the clearer the difference is.
Thanks anyway. |
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| serp |
| have the music the sound you hear of the mp3 it is pretty good but not like every only the music can make it though. |
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| robin |
me  my mp3's
:D
to bad that coolmon only works with 2000 and xp |
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