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  #31  
Old Apr 20, 2009, 11:57 AM
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Quote:
Originally Posted by Metroid View Post
A CDDA Album is 2 channels of 22Khz, check how far can MP3 files go. that program will tell you.
You are confusing signal frequency and sampling frequency. CD audio is defined as 16bits, 44100 Hz, stereo (sampling frequency), which can hold signal up to 22050 Hz (signal frequency).

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If MP3 files could hold as much as true 44Hkz don't you think we should be using it instead of Wav files as it would be less space and same quality?
1) We tend to prefer lossless compression because it is, well, lossless. Most people can't distinguish between 192kbps MP3 and an uncompressed WAV, myself included - but that has nothing to do with the use of MP3.
2) MP3 could certainly store much higher frequencies, but that would go right against its purpose of "stripping away what human ear can't hear in order to improve compression efficiency". It would be very much like buying the best color TV in existence so that you could watch the classical movies from the 1930's - it would work, but given that those moves are black-and-white, it would be a waste of money.
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  #32  
Old Apr 20, 2009, 03:44 PM
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Yes that is what I pointed out, each channel holds 22050 Hz x 2 = 44100 Hz.

I have done some tests.

Track 1 = MP3 320Kbps 7.89MB
Track 2 = True Wav File. 34.8MB

The Flac file = 26.2MB

That is the maximum that an MP3 file can go. I have to say that I was surprised by this test. I have analysed more than millions of MP3 files and never really seen any MP3 file going as high as this one. it topped 20Hkz, lossy but still very well encoded by me. Well pepack you were right however I still could notice the difference in quality as I have a very good high end headphones model number Denom AH-D5000.

This conversation was good to clarify some things.

Regards,
Attached Images
File Type: jpg Track 1 Frequency.JPG (72.7 KB, 8 views)
File Type: jpg Track 1 Spectrum.JPG (66.0 KB, 8 views)
File Type: jpg Track 2 Frequency.JPG (74.6 KB, 5 views)
File Type: jpg Track 2 Spectrum.JPG (61.7 KB, 7 views)
File Type: jpg winamp mp3 file.JPG (54.3 KB, 9 views)
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  #33  
Old Apr 20, 2009, 08:01 PM
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Quote:
Originally Posted by Metroid View Post
Yes that is what I pointed out, each channel holds 22050 Hz x 2 = 44100 Hz.
I am not going to argue any further. You have no idea what you are talking about, mixing apples and oranges.
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  #34  
Old Apr 21, 2009, 01:33 PM
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Actually I think he's right. The psychoacoustic model originally used for encoding MP3s assumed that humans can't hear tones above 16kHz so those are capped, regardless of the sample rate and encoding quality. LAME may have found a way around that spec limitation, I don't know.
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  #35  
Old Apr 21, 2009, 07:52 PM
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Originally Posted by Datschge View Post
Actually I think he's right.
He's partially right, but he is mixing two very different things (signal frequency and sampling frequency).

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The psychoacoustic model originally used for encoding MP3s assumed that humans can't hear tones above 16kHz so those are capped, regardless of the sample rate and encoding quality. LAME may have found a way around that spec limitation, I don't know.
That never was a limitation per se. From the very beginning the encoders had the capacity for encoding frequencies above 16 kHz and in fact some of them did, but often made the decision not to bother in order to produce smaller files.
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  #36  
Old Apr 22, 2009, 03:46 AM
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...regardless of the sample rate and encoding quality.

(Just to avoid a potential misunderstanding, I'm not talking about the low pass filter applied at lower quality settings even by modern audio codecs to keep the quality of tones not filtered acceptable. I'm talking about how by design decision most MP3 encoders/settings don't ever touch "CD quality" = 22kHz. To be honest besides clipping artifacts I personally haven't seen an MP3 rendering tones way above 16kHz yet. Modern codecs do that just fine at higher quality settings.)
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  #37  
Old May 4, 2009, 12:22 PM
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I personally like to rip all of my CDs with Exact Audio Copy and FLAC and then pack the CDs away somewhere so that they won't become damaged or anything like that.

MP3 and AAC format are still good for portable players though. Even if the player does support lossless codecs there's usually not enough space to store all of my songs, so.... But yeah, since I have a big enough hard drive I just try to keep everything in archival lossless.
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  #38  
Old May 6, 2009, 03:38 AM
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Mh... I use FLAC (single file + cuesheet). File size doesn't actually matter for me, because huge HDD's are quite cheap these days. If one 1TB HDD is filled, I just buy another one. MP3 is still fine for stuff I'm unable to get anywhere else. Though, I prefer self-ripped FLAC files most.
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