If you've got some encyclopedias onĬomputers are particularly good at cramming large amounts of information into pretty One big advantage of digital technology is that you can store A five-minute CD track will convert into something like a 3MB MP3 file at 65kbps or a 10MB file at 245kbps. This program, Asunder, lets you select a bit rate from 65kbps (low-quality) up to 245kbps (high quality). You can usually change the bit rate as well for better or worse quality (and bigger or smaller files).
#Ipod mp3 player software#
Screenshot: Software for "ripping" (converting) CDs to make MP3s typically lets you choose from a variety of different "encoding" types, including MP3. (You can read a bit more about sampling in our article on analog and digital.) The downside of higher sampling/bit rates and bit depth is that they produce more digital information that has to be stored-a bigger file size, in other words-and takes longer to download.
#Ipod mp3 player 320kbps#
A really high quality MP3 "ripped" (generated from) a CD might be produced using a bit rate of 320kbps (320,000 bits per second), while a lower quality one might use 64kbps (64,000 bits per second) or even lower. Typically, CD-quality sound involves sampling at a rate of 44.1kHz (44,100 times per second) and a bit depth of 16 (16 binary zeros and ones, so something like 0110110101001011). The more closely the digital file resembles the original analog sounds and the higher the quality of the recording.Ī higher sampling rate, bit depth, and bit rate give a better quality MP3 file. The more information it captures each time (the higher the bit depth),Īnd more detail it captures each second (the higher the bit rate),
The faster the computer samples (the higher the sampling rate), When the file or CD is played back later, the reverse process happens: a digital to analog converter turns the numbers back into analog electrical signals that become sounds when they're fed into a loudspeaker. This process is carried out by an electronic circuit called an analog to digital converter, which turns sounds (analog) into streams of numbers (digital), which are then stored in sequence in an MP3 file or on a CD. It analyzes all the sounds it can hear and converts them into a number. At the time of recording, a computer "listens" to the music track that'sīeing recorded and "samples" the volumes and frequencies of the sounds: about 44,000 times each second, (Jingle Bells, for example, looks a bit like this written in digital form: 3 3 3-3 3 3-3 5 1 2 3.) Instead of reading a musical score, you would have simply readĪ list of numbers and pressed the corresponding key or bell to generate each note in turn.
Instrument with numbers stuck to the keys or bells. Younger, you might have learned to play a simplified piano, xylophone, or other musical Sampling-and it's a kind of "music by numbers." When you were The key to storing music (or any other kind of sound) in digital format is a process called Stored by a groove on a plastic record that was twice as deep as normal, so the stored information wasĪ faithful "analog" of the original sound. A sound twice as loud as normal might have been Representation of the original sound, without using any numbers at all. That means music was stored as a physical or magnetic CDs are digital too, but older music formats (including LP records and cassette tapes) used analog technology. Sounds you hear are stored in numerical form. MP3 is an example of digital technology, which means Halfway to understanding how it all works. Stored in coded format inside those files, and you're Special type of computer, dedicated to playing back sounds Think of MP3s as computer files and an MP3 player as a Printable documents, so MP3 is a particular file type used for storing music.
#Ipod mp3 player pdf#
Word-processing program, and PDF is another type of file for storing
My old 20GB, 4th generation Apple iPod (white) does little more than play music. Photo: The Apple iPod: one of the pocket MP3 players that put digital music on the map. IPod has enough memory to store about 500 CDs-rather more than you canįit in your pocket! So what exactly is "MP3" and how does it work? You can take them with you wherever you go. Heavier, they can store thousands of music tracks, photos, or videos so Smaller than a pack of cards and only a little Last updated: November 20, 2021.Īre a great example.
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