MP32009_Pres - MP3 Players By: Ashwin Budhiraja, Joseph...

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MP3 Players By: Ashwin Budhiraja, Joseph Lee, and Mark Lyznicki
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Technology An MP3 player differs from tape and CD players as it does not require any moving parts to read encoded data. MP3 players are data storage devices which have software to facilitate the transfer of MP3 files to the player. MP3 players broadly have the following components: Microprocessor Memory Digital signal processor (DSP) Display Playback Controls Audio port Amplifier Power supply
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Circuit Board
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Functioning The diagram below shows the various steps involved in the functioning of an MP3 player. After receiving a command from the player controls the signal is sent to the Microprocessor which is the ‘brain’ of the player. The Microprocessor then pulls the song from the memory of the player. The Digital Signal Processor (DSP) then decompresses the encoding and converts the signals through an A to D & D to A converter. The DSP also acts as a filter to alter sounds. The last step in the process is the amplification of the sound waves and the transfer of those sound waves to the audio port.
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Microprocessor A Microprocessor is a very small logic chip which executes and directs all commands in the MP3 circuitry. Microprocessors have a set of instructions built in which it operates by doing basic arithmetic and logic functions such as addition, subtraction, comparison of numbers etc.
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Microprocessor The three basic functions of a Microprocessor which combined together execute complex commands are: Using the Arithmetic/Logic Unit (ALU) for addition, subtraction, multiplication, division, comparison of numbers etc. Moving data from one memory location to another. Making decisions and jumping to new sets of instructions based on decisions.
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Digital Signal Processors (DSP) The image below shows the contents of a DSP Program memory stores programs the DSP will use to process data. Data memory stores the data to be processed. Compute Engine does the math processing by accessing resources and data from the program and data memory. Input/Output connects to the outside world.
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Digital Signal Processing (DSP) A DSP processes signals by a digital means. This processing is done by numerical means. DSP’s are microprocessors which can have a range of different functions depending on how they have been programmed. With regard to MP3’s, DSP chips play a role in filtering the sound waves.
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Digital Signal Processors (DSP) The following image shows the overall working of a Digital Signal Processor: The first step is the conversion of sound waves in analog form to digital form by means of a Analog to Digital converter.
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This note was uploaded on 01/24/2012 for the course ECE 317 taught by Professor Peck,t during the Spring '08 term at University of Illinois, Urbana Champaign.

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MP32009_Pres - MP3 Players By: Ashwin Budhiraja, Joseph...

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