MP3 car player
First Claim
Patent Images
1. An MP3 car player, comprising:
- a display unit displaying information of replaying audio data;
a keypad controlling drives of compact disks (CDs) and compact disk read only memories (CD-ROMs);
a speaker unit outputting the audio data in a format audible to the human ear;
a file type detector reading source data of the CDs and CD-ROMs and determining whether the file of the data is an ordinary audio CD file or an MP3 audio file;
an MP3 file input unit receiving the MP audio file detected from the file type detector, and detecting errors and temporarily storing the data in a first memory;
an MP3 decoder receiving the MP3 data from the MP3 file input unit and restoring compressed data by use of a Huffman decoding method, and converting the data into pulse code modulation data;
a controller unit reading the data stored in the MP3 file input unit, controlling the display unit and the keypad, and writing data to the MP3 decoder;
a peripheral interface unit controlling the control signals between the display unit, the keypad, and the controller unit; and
a digital/analog converter receiving ordinary audio CD data from the file type detector or receiving pulse code modulation digital data from the MP3 decoder and converting the data into analog data and outputting the data to the speaker unit.
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Abstract
Disclosed is a MP3 car player which prevents a compact disk (CD) player equipped in a car from discontinuing playing of a CD as a result of bumpy road conditions, etc., is able to use both conventional CDs and MP3 CD-ROMs, and compresses and decompresses audio data at a high compression ratio to enable the recording of 150˜200 songs in a single CD-ROM without the loss of sound quality, thereby making use of the expensive CD changer unnecessary. The present invention comprises a file type detector, an MP3 file input unit, a peripheral interface unit, a controller unit, an MP3 decoder, and a digital/analog converter.
145 Citations
5 Claims
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1. An MP3 car player, comprising:
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a display unit displaying information of replaying audio data;
a keypad controlling drives of compact disks (CDs) and compact disk read only memories (CD-ROMs);
a speaker unit outputting the audio data in a format audible to the human ear;
a file type detector reading source data of the CDs and CD-ROMs and determining whether the file of the data is an ordinary audio CD file or an MP3 audio file;
an MP3 file input unit receiving the MP audio file detected from the file type detector, and detecting errors and temporarily storing the data in a first memory;
an MP3 decoder receiving the MP3 data from the MP3 file input unit and restoring compressed data by use of a Huffman decoding method, and converting the data into pulse code modulation data;
a controller unit reading the data stored in the MP3 file input unit, controlling the display unit and the keypad, and writing data to the MP3 decoder;
a peripheral interface unit controlling the control signals between the display unit, the keypad, and the controller unit; and
a digital/analog converter receiving ordinary audio CD data from the file type detector or receiving pulse code modulation digital data from the MP3 decoder and converting the data into analog data and outputting the data to the speaker unit. - View Dependent Claims (2, 3, 4, 5)
an integrated development environment (IDE) interface unit receiving MP3 audio files determined by the file type detector and performing IDE communications for use in a memory card;
an error detector receiving the MP3 file data through the IDE interface unit and checking whether or not the data are normally received, and when errors are detected in the data, returning to an initialization step; and
a memory block receiving addresses of a second memory, chip selection signals, and read and write signals from the controller, and controlling the second memory when temporarily storing the errorless MP3 data in the first memory in order to decode the errorless data before transmitting the data to the MP3 decoder.
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3. The MP3 car player in claim 1, wherein the peripheral interface unit comprises:
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a display interface unit performing interface operations on displaying items such as titles of audio data or track numbers on the display unit; and
a keypad interface unit controlling the operations between the keypad and the controller, the operations including controlling keys which operate the CDs and CD-ROMs and selecting rows and columns of the keypad.
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4. The MP3 car player in claim 1, wherein the controller unit comprises:
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a controller reading the data stored in the MP3 file input unit, and displaying information of the audio data on the display device, and outputting the data to the MP3 decoder according to input from the keypad; and
a third memory storing instructions to drive the controller, address map information, and bootstrap signals to initialize the operation when power is supplied.
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5. The MP3 car player in claim 1, wherein the MP3 decoder comprises:
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an MP3 interface unit handling the data received from the MP3 file input unit for each serial bit;
a control and status register controlling a response signal which conveys information of whether or not the data provided to the MP3 interface unit have errors to the controller, and displaying an empty or full status of the provided data;
a fourth memory receiving serial data from the MP3 interface unit and storing the data;
a parser receiving data from a fifth memory and encoding the data using the Huffman decoding method;
an inverse modified discrete cosine transform unit performing inverse modified discrete cosine transform on the data encoded from the parser, and transforming the data into pulse code modulation data;
a sixth memory temporarily storing the pulse code modulation data; and
a pulse code modulation interface unit receiving the pulse code modulation data from the sixth memory and outputting the data to the digital/analog converter.
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Specification