Presentation on theme: "How a MP3 Player Works and Operates. By: Kyle Anderson & Michael Theis."— Presentation transcript:
How a MP3 Player Works and Operates. By: Kyle Anderson & Michael Theis
What is MP3? MP3, or MPEG Audio Layer 3, is one method for compressing audio files. MPEG is the acronym for Moving Picture Experts Group. The MP3 file format revolutionized music distribution in the late 1990s, when file-swapping services and the first portable MP3 players made their debut. (My little Pony 3) Perhaps?
Compression Bright Side The MP3 compression system reduces bytes, (like MB or GB) So that more songs can be carried in a portable device. Down Side The draw back is that by compressing, you lose more of the song’s quality. Above: Compression of the co-worker.
More Compression Considering the average song is about 4 minutes, on a CD that song would take 40 MB. However through MP3 compression, it would take only 4 MB of space. In terms of the iPod: An MP3 player with 1 GB of storage would be able to hold about 240 songs. The equivalent of 20 CDs! However, now some CDs do support MP3 files. Below: Compression of the face
Are there other forms? While MP3 is perhaps the most well know file format, but there are other formats that can be played on a MP3 player as well. WMA - Windows Media Audio WAV - Waveform Audio MIDI - Music Instrument Digital Interface. AAC - Advanced Audio Coding (AAC) Ogg Vorbis - A free, open, and un-patented music format ADPCM - Adaptive Differential Pulse Code Modulation ASF - Advanced Streaming Format VQF - Vector Quantization Format Can you find Waldo? (Hint: you’re not trying hard enough)
The Technology Behind it. Unlike earlier forms of music players such as CDs or tapes, many MP3 players do not require moving parts to operate. They use instead solid-state memory. However, these are Flash type MP3 players, and they are not capable of holding as much as hard drive types. On the down side, hard drive types, such as Creative nomads or the iPod also run a higher risk of failure, since it has moving parts like a computer. Trippy, Mikulec-inspired background.
More on Technology MP3 player tasks 1)Store music 2)Play music 3)Allow the user to listen to the song How this is Accomplished 1)MP3 player pulls song from it’s memory. 2)Then decompresses the MP3 encoding 3)Player runs the decompressed bytes through a digital to analog converter. 4)Finally, amplifies the analog signal allowing the song to be heard. You guys are a disgrace to MP3 players everywhere.
Components While the specific components may bary, here are some of the basic parts to a MP3 player. Data port Memory Microprocessor Digital Signal Processor (DSP) Display Playback controls Audio port Amplifier Power supply It also doubles as a Clock!
MP3 File Structure MP3 files are made up of multiple MP3 frames which consist of the MP3 header and the MP3 data. This sequence of frames is called an elementary Stream. The MP3 header consists of a sync word which is used to identify the beginning of a valid frame. This is followed by a bit saying that this is a MPEG standard and two bits saying that the layer 3 is being used (MPEG-1 Audio Layer 3) or MP3 for short. Winegar : See. Below