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INVESTING THE WORLD MP3 PLAYER

music players have become very popular so quickly. are devices that store, organize and play digital audio files. are commonly called MP3 because this format for audio playback has been the best known and popular. However there are other formats: WMA (Windows Media Audio), AAC (Advanced Audio Coding).

There are three main digital audio players:

· CD-MP3 players. Devices that play CDs. Often, it can be used to play audio CDs and homemade data CDs containing MP3 or other digital audio files.

· flash-based players. Are devices that store digital audio files on internal or external memory such as memory cards. Are devices with little storage capacity, typically range from 128MB - 4GB, which can often be extended with additional memory.

hard drive based players. Devices that read digital audio files from a hard disk. These players have larger storage capacities from 1.5 GB to 100GB, depending on hard disk technology. Examples appear on the Apple iPod, Creative Zen and Commodore EVIC.

The MP3 stands for MPEG-1 Audio Layer 3 (acronym), but is heard as emepetrés. Format is a lossy compressed digital audio developed by the Moving Picture Experts Group (MPEG) to form part of Release 1 (later upgraded to version 2).

MP3 is a format for encoding digital audio. uses an algorithm of a low quality of original signal recovery designed to reduce the amount of data required to represent the recording audio. Still, still sounds like a faithful reproduction of the original signal, uncompressed audio to most listeners.

was invented (the format, not the player) by a team of European engineers of Philips, CCETT (Joint Research Center for Television and Telecommunications), IRT and Fraunhofer Society, worked on the research program Eureka 147 digital radio, and became an ISO / IEC in 1991.

companies Fraunhofer-Gesellschaft and Thompson Multimedia devoted to the manufacture and sale of patents related to the MP3.

The first occurred in 1986. Until July 1995, Brandenburg was first used mp3 extension for files associated with mp3 stored in his computer.

The MP3 format has been used to transfer audio compression and high quality (high fidelity decrease in equipment) because you can adjust the quality of understanding, proportional to the size per second (bit rate ), and therefore the final size of the file, which can take 12 to 15 times less than the original uncompressed file.

Thanks to the Internet exchange, it became possible to exchange music files. The MP3 also has been more development in the field of computer thanks to the standalone players, portable stereos, or integrated.

Other audio formats have begun to appear in early 2002, which made the MP3 start to fall for them as WMA and Ogg Vorbis.

One factor that falter is that MP3 is patent (a set of exclusive rights guaranteed by a government or authority to the inventor of a new product capable of be used industrially for the good of the applicant for that invention), which prevents their improvement and becomes mandatory pay to use some code.

Nevertheless, the MP3 format is still the most popular today.

Audio Coding

MPEG-1 standard does not include a precise identification for an MP3 encoder. decoder algorithm and File formats are well defined. standard implementers had to plan their own algorithms to remove pieces of information from a range of audio. 576 When encoding samples in the time domain and transforms are taken in 576 samples in the frequency domain. If there are signal changes (oscillations), instead of taking 192 samples taken 576. This is to reduce the noise accompanying the signal.

There are several types of MP3 encoders for each producing files of differing quality. The user can choose the one that best suits your needs, one need only consider an encoder becomes more efficient when encoding at a higher rate of bits.

audio decoding

When the decoder decompresses the result is output as the MP3 file that entered the encoder (with a specified degree of rounding tolerance ) as explained in the document ISO / IEC.

MP3 file has a standard format which is a plot that is at 385, 576 or 1152 samples (depends on MPEG version and the envelope). Each data frame has 32-bit audio and ancillary data that, depending on MPEG version and stereo mono, are 9, 7 or 32 bits.

Comparison of decoders is based on how efficient they are to be programmed. (Ex: How much memory or CPU time used in the decoding)

HOW TO BUILD AN MP3 PLAYER

MP3 player that we design is the Daisy 2, which has both advantages and disadvantages. This player is available as a kit design and construction of electronic devices. Before joining is necessary to review the decoder chip before soldering on the board, and if necessary, and not to unsolder and re-welding, assembling all components on breadboard and test each function as it should.

Material:

1: pin heads bent

2: VS1011 decoder chip

3: protector terminal 40-pin DIP

4: socket (connector) SD / MMC, to insert cards.

5: capacitor of 100 m f low ERS (Equivalent Series Resistance)

6: 100 capacitors m f

7: capacitor 10 f m low ERS (Equivalent Series Resistance)

8: a printed circuit board

9: headphone jack

10: capacitors of 0.1 m f

11: capacitores de 22pf

12: interruptor slide

13: Leds

14: microchip PIC18F45J10

15: red de resistores de 10K

16: cristales

17: resistores de 15 ohms

18: resistores de 10K

19: resistores de 1K

20: resistores de 22K

21: pin heads rights

22: voltage regulator

23: 1M resistor

24: diodes

Circuit Table

have a small point or notch on the end where the pin 1. In the diagram where the parties are located, all orientations are noted. crystals, resistors, capacitors small (.1 uF and 22pF) and the slide switch are not polarized, so they can be in any direction. The crystal with the ink mark is the 24,576 MHz

The largest chip is the PIC which gives the control interface and fills the data decoder chip. Daisy In the player there is a connection between the decoder chip and SMD PIC controller.

This component is a MP3 decoder / WAV and headphone amplifier all in one. be welded with care, since it is very complicated and we are not referring to a party more important.

To mount the SMD chip solder are to where their badges, will be easier if you use liquid flux. If you do not use it, must be very careful that the tracks that are in the circuit, do not delay too.

After that terminals be soldered chip. The chip is put on the track and with the soldering iron melt the solder already made earlier. Ensure that all components soldered to verify the strength with which they are soldiers, You can use the multimeter to check continuity.

In the kit there are two panes. marking is 24,576, while it is not selected is 10Mhz. They are not polarized, meaning they can be in any sense.

After soldering each component, carefully cut out terminals. With the help of a cutter plane (as shown above) keeps jumping wires.

When soldering the resistor network, remember that one edge is marked by a point which is indicated in the instruction set the position to be taken with respect to that point.

with components normally long terminal heats and melts the solder while it is hot.

For the headset connector is where the tins are welded first.

have to emphasize the position of the notch when welding the component to protect the PIC controller, and that the notch will determine the order of the pins.

The diode symbol is a triangle with a line through one end. That line marks the cathode of the diode. sure to put the diode in the right direction before soldering.

The length of the distance to the terminals of the capacitor .01 uf is too wide (in the kit) so they are difficult to weld in where they belong within the circuit.

That's easy to fix. Using tongs straighten support terminals, but not try to move close to the capacitor.

Once done, the capacitors are soldered. When soldering the capacitors can be seen that the labels for c11 and c12 are barely visible through the decoder chip soldered terminals.

To install the voltage regulator are separated a little a bit and terminals are inserted. The flat side must match the one printed on the board.

This requires 10uF capacitor terminals are bent. sure to bend the terminals, they must be in the right direction to match the circuit as shown in illustration below (and also check where it belongs polarization).

Remember that LEDs are polarized, the shorter terminal represents the cathode, so to put it, to the cathode where the flat is marked, as shown in the illustration above. This notation does not appear in the instructions, so I will not be forgotten.

When you install the PIC chip, the distance between terminals is very wide in comparison to those at the other side. So there to put them carefully in the circuit starting with those at one end. The idea is to fold them all very carefully until the chip is seated on the circuit.

You Daisy player applies a voltage to 5V power supply for PC. On the other hand, connected to a battery prevents excessive noise in sound output.

For this player, you use an SD / MMC, a miniSD or microSD card in a SD adapter. card is formatted with a FAT 2 external card reader, files are downloaded MP3 and Daisy goes on to insert the card and listen to downloaded music.

Daisy player Advantages:

It could change the power supply.
has lots of space in the memory thanks to the PIC chip.
sounds great decoder chip (the answers given by the decoder is as if the signal has not been modified).
can be controlled.
is adaptable to any situation.

Daisy player Disadvantages:

You need a PC and a card reader to format your card to FAT32.
can not use USB to download information.
The jumpers are cheap but are difficult to find.
No display on the player, it shows what song you're listening.

SOME OF THE MOST MP3 PLAYERS PRESENT:

i.Beat Organix. Plays in MP3, WMA, WAV, OGG and ASF. has an integrated FM tuner. has 2 GB and runs for 25 hours. The features include digital clock with alarm and voice recorder. Compatible with Windows and Mac

i.Beat DM Vision. You can play MP3, WMA, OGG, and WMA-ORM9 TOM and TOM video format and JPEG images. has a capacity of 2 GB and its battery is recharged within 2 hours.

I. Beat Drive 2.0. is for MP3, WMA and WAV. Runs on AAA battery can be connected to computer with USB and is compatible with Windows and MAC.

WMT28. For MP3 and WMA. works as storage, USB, reading and writing to SD cards. Compatible with all Windows versions.

MP322. can listen MP3 and WMA formats. has FM radio and voice recorder. functions as a mass storage unit and as reader / writer for SD cards, which help extend the device's memory. Compatible with Windows SE, ME, 2000 and XP.

MP320. can listen MP3 and WMA formats. has voice recorder, reader / writer for SD cards, flash memory 256, 512 MB and 1 GB, and USB connection. Compatible with Windows SE, ME, 2000 and XP.

As you read above, that players have almost identical functions, same memory, formats and are compatible with almost the same as Windows systems. These players are the most current on the market. addition to fulfilling its primary function is to reproduce music, also perform other functions such as voice recording, radio, digital clock and even play videos and images, making it come closer to the MP4.