TheOtus
500+ Head-Fier
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- Oct 8, 2009
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Yes, I guess it could have been misleading. I meant that if you burn a CD that´s playable in any CD-player.
Originally Posted by watchluvr4ever I'm not sure I understand what you are saying. If I were to burn a CD in MP3 format it will take up less space. |
Originally Posted by Sovelin /img/forum/go_quote.gif lol, I definitely read the graph wrong. There's a very good chance I'm wrong on the 100Hz thing. It is probably closer to 50 or below. When I had my home theater system, I had the crossover on my sub set to 80Hz. When I played a song through my iPod that was at 160kbps, the bass response would be very weak. When I played the same song on the cd, the sub would knock me off my chair. I know the 160kbps is going to cut off the bass at some frequency, just not sure where. |
Originally Posted by TheOtus /img/forum/go_quote.gif This got me very interested... How is this possible? Well, more precisely, how can a normal CD-player play that? I mean doesn´t the CD-player read the disc with a standard speed? I really don´t get this... The audio has to be compressed somehow, but how would a normal CD-player be able to get a clue of it? To the topic, as said the analyzer or spectrum are only ways, beside listening. A CD burned of mp3-files takes the same amounf of space than a direct copy of the actual CD. |
The program area is 86.05 cm² and the length of the recordable spiral is (86.05 cm² / 1.6 µm) = 5.38 km. With a scanning speed of 1.2 m/s, the playing time is 74 minutes, or around 650 MB of data on a CD-ROM. If the disc diameter were only 115 mm, the maximum playing time would have been 68 minutes, i.e., less six minutes. A disc with data packed slightly more densely is tolerated by most players (though some old ones fail). Using a linear velocity of 1.2 m/s and a track pitch of 1.5 µm leads to a playing time of 80 minutes, or a capacity of 700 MB. Even higher capacities on non-standard discs (up to 99 minutes) are available at least as recordables, but generally the tighter the tracks are squeezed, the worse the compatibility. |
Originally Posted by watchluvr4ever /img/forum/go_quote.gif I'm not sure I understand what you are saying. If I were to burn a CD in MP3 format it will take up less space. |
Originally Posted by Sovelin /img/forum/go_quote.gif So in this case the only thing cut out from the original song was above 15.25kHz? Well, I'm sure if we looked at it below the 1kHz mark we would see how the 160 kbps copy is lacking, probably cut off at ~100Hz |