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AnswerWiki User06/06/2011
The difference between 128 kbps and 320 kbps MP3 Song Files
Brief about the MP3 file structure and bit rate:
MPEG-1 Audio Layer 3, more commonly referred to as MP3, is apatented digital audio encoding format using a form of lossy datacompression. It is a common audio format for consumer audiostorage, as well as a de facto standard of digital audiocompression for the transfer and playback of music on digital audioplayers.
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The use in MP3 of a lossy compression algorithm is designed togreatly reduce the amount of data required to represent the audiorecording and still sound like a faithful reproduction of theoriginal uncompressed audio for most listeners. An MP3 file that iscreated using the setting of 128 kbit/s will result in a file thatis about 11 times smaller than the CD file created from theoriginal audio source. An MP3 file can also be constructed athigher or lower bit rates, with higher or lower resultingquality.
The compression works by reducing accuracy of certain parts ofsound that are deemed beyond the auditory resolution ability ofmost people. This method is commonly referred to as perceptualcoding. It uses psycho-acoustic models to discard or reduceprecision of components less audible to human hearing, and thenrecords the remaining information in an efficient manner.
Bit Rate and Audio Quality
In telecommunications and computing, bitrate (sometimeswritten bit rate, data rate or as a variable Ror fb) is the number of bits that are conveyed or processedper unit of time. The bit rate is quantified using the bits persecond (bit/s or bps) unit, often in conjunction withan SI prefix such as kilo- (kbit/s or kbps), mega- (Mbit/s orMbps), giga- (Gbit/s or Gbps) or tera- (Tbit/s or Tbps).
Effects of bit rate on space and audio quality
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When performing lossy audio encoding (compression process), suchas creating an MP3 file, there is a trade-off between the amount ofspace used and the sound quality of the result. Typically, thecreator is allowed to set a bit rate, which specifies how manykilobits the file may use per second of audio. Using a lower bitrate provides a relatively lower audio quality and produces asmaller file size. Likewise, using a higher bit rate outputs ahigher quality audio, but also results in a larger file.
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Files encoded with a lower bit rate will generally play back ata lower quality.
A few recommendations
If you have larger storage device like hard disk drives, then Iwould recommend to enjoy the sound quality with 320 kbps MP3 files,however for limited storage device like MP3 compatible mobilephones, I would recommend to go for lower bit rate MP3 files. Ifyou have mobile device with greater storage or expandable memory,so nothing to worry to use MP3 files with higher bit rate.
Simple Equations
Higher Bit Rate >> More Bits/Seconds >> More SoundInformation >> Higher Sound Quality >> Greater StorageSpace
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Lower Bit Rate >> Less Bits/Seconds >> Less SoundInformation >> Lower Sound Quality >> Lesser StorageSpace
Another Answer:
This is actually very debatable. I can say with confidence thati have a very good ear, and i honestly dont hear the differencebetween both.
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To be more precise, if you have an iPod or any mp3 player, andthat you have normal average headsets, you wont hear thedifference, + it'll save you space.
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I've done the test with classical (mozart's requiem, greatamount of vocals and harmonies), black metal (thorns, very highpitch and dense sound) & even some freakishly rich experimentalindie stuff like Múm (specially their album «Yesterday Was Dramatic- Today is ok»)
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Finally, for both 320 and 128kbps; it'll never equal the qualityof CD, played with a HiFi system.
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