KR20010063352A - Mp3 player of compact disc type - Google Patents

Abstract

PURPOSE: A compact disk type MP3 player is provided to playback MP3 file selectively and to prevent noise and an operation error by classifying MP3 file and data for audio on a compact disk. CONSTITUTION: An operation part(10) controls power supply and volume adjustment, indicates several kinds of character and graphic, and replays MP3 file or stops playback of MP3 file transferring the front and rear of MP3 file list. A compact disk receiving part(20) carries in or out the compact disk which MP3 file and audio data stored and mixed in. A servo control part(30) reads and transmits MP3 file and several kinds of data stored in the compact disk. A microprocessor(41) inputs and outputs several kinds of signal according to signal input from the operation part(10), and executes several kinds of program. A digital signal processing apparatus(42) decodes data for audio. A memory apparatus(43) exchange the digital signal processing apparatus to digital data and stores digital data for a while. An MP3 decoder(44) decodes MP3 file according to a designated bit rate. An analog to digital converter converts digital data transmitted separately from the MP3 decoder(44) into analog data. An output apparatus(50) amplifies and outputs analog signal transmitted from the digital to analog converter of a data processing apparatus(40).

Description

MP3 player of compact disc type {MP3 PLAYER OF COMPACT DISC TYPE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compact disc (CD) type MP3 player, and more particularly to a compact disc type MP3 that selectively searches for and plays back MP3 files on a compact disc in which MP3 files and various types of data files are stored. It's about the player.

In general, a large number of music can be stored in an audio recording medium such as a compact disc (CD) or a tape, and a disc (CD) or tape type playback apparatus is widely used for home use or portable use.

However, in the case of a general audio compact disc (CD), since the capacity for storing music is about 10 to 15 songs, the user can only listen to limited music of about 10 to 15 songs, and listen to a large number of music. In order to replace the CD was inconvenient.

MP3 file was developed to solve this inconvenience. An MP3 file is an audio file in which music is compressed and encoded, and the number of music that can be stored on a compact disc (CD) is 10 to 20 times larger than general audio data. In addition, since music can be reproduced at a sound quality similar to that of an audio compact disc (CD), it is stored in a CD or a memory card and widely used.

On the other hand, the logical format of data stored on the compact disc (CD) is composed of a path table and a directory record of the ISO 9660 standard. In addition, the MP3 file has a header including encoding information such as 12-bit SYNCWORD, MPEG LAYER, and BIT RATE at the beginning of the file.

However, a general compact disc (CD) reproducing apparatus reproduces audio data stored on a compact disc (CD), but cannot reproduce MP3 files stored therein. In addition, the MP3 compact disc (CD) player has a problem in that MP3 files stored on the compact disc (CD) are reproduced, but the audio data stored therein cannot be reproduced.

In addition, the portable MP3 player currently used has a problem that strange noises or operational errors occur when the MP3 file is played (played) when the MP3 file and the general data are mixed and stored on a compact disc (CD). .

Accordingly, an object of the present invention is to provide a compact disc type MP3 player for selectively playing MP3 files by dividing MP3 files and audio data on a compact disc (CD) in which MP3 files and various kinds of audio data are mixed and stored. To provide.

1 is a view showing an operation unit of the present invention,

2 is a schematic overall configuration diagram of the present invention;

3 is a flowchart illustrating a process of creating a playlist of an MP3 file according to the present invention;

4 is a flowchart illustrating a process of modifying a playlist while playing an MP3 file according to the present invention.

With reference to Figures 1 to 4 will be described in detail the configuration of the present invention.

1 is a view showing the operation of the present invention, Figure 2 is a schematic overall configuration of the present invention.

As shown in Fig. 1 and Fig. 2, the present invention is a compact disc (CD) type MP3 player, which controls power supply and volume control, displays various characters and graphics, moves back and forth in the MP3 file list, An operation unit 10 for reproducing the file or stopping the reproduction of the MP3 file; A compact disc accommodating unit 20 for importing or exporting a compact disc (CD) in which MP3 files and audio data are mixed and stored; A servo control unit (30) for reading and transmitting MP3 files and various data stored on the compact disc (CD); The microprocessor 41 inputs and outputs various control signals in accordance with the signal input from the operation unit 10, and processes the digital data, transmits the digital data to the microprocessor 41, and transmits the audio data. A digital signal processor 42 for decoding, a storage device 43 for temporarily storing digital data while exchanging digital data with the digital signal processor 42, and an MP3 file according to a predetermined bit rate. A data processor 40 comprising a MP3 decoder 44 for decoding, a digital-analog converter 46 for converting digital data transmitted from the digital signal processor 43 and the MP3 decoder 45 into analog data, respectively. Wow; And an output device 50 for amplifying and outputting an analog signal transmitted from the digital-to-analog converter 46 of the data processing device 40.

The operation unit 10 includes an on / off button BT for controlling the supply of power, a volume controller VA for adjusting the volume of the speaker SP, a display DS for displaying various characters and graphics, Plays the MP3 file selected from the list of MP3 files displayed on the display DS and moves up / down button UD to move forwards or backwards through the list of MP3 files displayed on the display DS, or And a play / stop button (PS) for stopping playback of the MP3 file, and is electrically connected to the data processing device 40.

The compact disc (CD) is composed of a ROM (Read Only Memory) type compact disc that stores not only data in the form of MP3 files compressed with music, but also other types of audio data. Are imported or exported).

In addition, the compact disc accommodating part 20 includes a space, a rotating motor, and an opening / closing button, which are not shown and carried in and out of the compact disc, and are electrically and mechanically connected to the servo controller 30. .

The servo controller 30 is composed of a motor drive device, an optical pickup device, and the like, and is electrically connected to the data processing device 40.

The data processing device 40 further includes a microprocessor 41 for executing various programs while inputting and outputting various control signals, a digital signal processing device 42 for signal processing and decoding digital data, and storage for temporarily storing data. A device 43, an MP3 decoder 44 for decoding an MP3 file, and a digital-to-analog converter 45 for converting digital data to analog data, and the servo device 30 and the output device 50; It is electrically connected.

The microprocessor 41 executes various programs while exchanging control signals with various devices in accordance with signals input through the operation unit 10 and the servo device 30.

The digital signal processor 42 is composed of a digital signal processor (DSP), a decoder (Decoder), and the like, and the microprocessor 41 and the servo device 30 and various signals and Signal or process digital data while sending and receiving data.

The storage device 43 is composed of a DRAM, a memory, and the like, and temporarily stores data. The MP3 decoder 44 is composed of a decoder and the like, and decodes the MP3 file according to a predetermined bit rate.

The digital-to-analog converter 45 is configured as a D / A converter, and converts the digital data decoded by the digital signal processor 42 and the MP3 decoder 44 to analog data.

The output device 50 includes an amplifier AP for amplifying a signal at a predetermined ratio and a speaker SP for outputting the amplified signal in a sound form, and is electrically connected to the data processing device 40. It is.

The operation of the present invention configured as described above will be described with reference to FIGS. 3 and 4.

First, a process of creating a playlist of an MP3 file according to the present invention will be described with reference to FIG. 3.

First, a user loads a compact disc (CD) into the compact disc accommodating part 20 by using an opening / closing button (not shown) installed in the compact disc accommodating part 20.

Subsequently, the on / off button BT of the operation unit 10 provided at the predetermined position of the portable MP3 player is operated to supply power.

At this time, the microprocessor 41 built in the data processing device 40 determines whether power is supplied (step S1).

As a result of the determination in step S1, when the power is supplied, it is determined whether or not the compact disc CD is loaded into the compact disc housing portion 20 through the digital signal processing device 42 and the servo device 30 ( Step S2). If power is not supplied, the step S1 is executed again.

As a result of the determination in step S2, when the compact disc CD is not carried in, a message indicating that there is no compact disc is displayed on the display DS of the operation unit 10 in text and graphic forms (S3). Step S2 is executed again.

In addition, when a compact disc (CD) is loaded, data stored on the compact disc (CD) through the servo device 30, that is, a volume descriptor, a path table, and a directory record ( The Drectory Record is read sequentially and transmitted to the microprocessor 41 through the digital signal processing device 42 (step S4).

Next, the microprocessor 41 determines whether the extension of the input data is MP3 or MP2 (step S5).

As a result of the determination in step S5, when it is determined that the extension of the input data is not MP3 or MP2, the step S4 is executed again.

If it is determined that the extension of the input data is MP3 or MP2, a playlist is created and temporarily stored in the storage device 43, and the MP3 file play list created on the display DS of the operation unit 10. Is displayed.

Next, the process of playing the MP3 file will be described in detail with reference to FIG.

The playlist created in the playlist creation process is displayed on the display DS of the operation unit 10.

In this state, the user operates the up / down button UD of the operation unit 10 to select the MP3 file to be listened to, and moves back and forth the MP3 file displayed on the display DS, and then moves the MP3 file. (Step SS1).

In this case, a control signal is transmitted from the up / down button UD of the manipulation unit 10 to the servo controller 30 through the microprocessor 41 and the digital signal processor 42 of the data processor 40. At this time, the servo controller 30 moves the optical pickup device (not shown) to the address of the compact disc CD in which the MP3 file is stored in accordance with the input signal (step SS2).

Subsequently, the servo control unit 30 reads the 12-bit SYNCWORD included in the header of the MP3 file, the MPEG LAYER, the bit rate, and the like using the optical pickup device, and then through the digital signal processing device 42. The data is sent to the microprocessor 41 (step SS3).

Next, the microprocessor 41 determines whether the transferred data is an MP3 file (SS4).

As a result of the determination of the step SS4, if it is determined that the file is not an MP3 file, an error content indicating that the corresponding MP3 file selected and displayed on the display DS is not an MP3 file is displayed graphically as a character, and then a playlist Go to the next MP3 file on the image (step SS7).

If it is determined that the file is an MP3 file, an MP3 file is played (step SS5). The step SS5 is processed as follows.

Initially, the MP3 file selected by the user in the operation unit 10 is read by the servo control unit 30 on the compact disc (CD), and the MP3 decoder (through the digital signal processing unit 42 and the microprocessor 41). 44).

Subsequently, the MP3 decoder 44 decodes the transmitted MP3 file with a decoder, and then transmits the same to the digital-analog converter 45, and the digital-analog converter 45 converts the transmitted digital data into analog data. To the output unit 50.

Next, the output unit 50 amplifies the signal transmitted from the digital-to-analog converter 45 by the amplifier AP and outputs the sound through the speaker SP.

Then, the microprocessor 41 of the data processing unit 40 determines whether or not the information of the MP3 file is transferred from the compact disc CD by the servo control unit 30 (step SS6).

When the determination result of the step SS6 determines that the information of the MP3 file is transferred from the compact disc CD, the step SS6 is executed again, and the information of the MP3 file is stored from the compact disc CD. If it is determined not to be transmitted, the step SS7 is executed.

As described above, according to the present invention, MP3 files and audio data can be selectively played back on a compact disc (CD) in which MP3 files and various kinds of audio data are mixed and selectively reproduced. When playing (playing) a file, it is possible to prevent strange noises or operational errors from occurring.

Claims (6)

In the compact disc (CD) type MP3 player, An operation unit 10 for controlling power supply and volume control, displaying various characters and graphics, and moving back and forth of the MP3 file list to play or stop playback of the MP3 file; A compact disc accommodating unit 20 for importing or exporting a compact disc (CD) in which MP3 files and audio data are mixed and stored; A servo control unit (30) for reading and transmitting MP3 files and various data stored on the compact disc (CD); The microprocessor 41 inputs and outputs various control signals in accordance with the signal input from the operation unit 10, and processes the digital data, transmits the digital data to the microprocessor 41, and transmits the audio data. A digital signal processor 42 for decoding, a storage device 43 for temporarily storing digital data while exchanging digital data with the digital signal processor 42, and an MP3 decoder for decoding MP3 files according to a predetermined bit rate. (44) and a data processor (40) comprising a digital-analog converter (46) for converting the digital data transmitted from the digital signal processor (43) and the MP3 decoder (45) into analog data, respectively; A compact disc (CD) type MP3 player comprising an output device (50) for amplifying and outputting an analog signal transmitted from the digital-to-analog converter (46) of the data processing device (40). The method of claim 1, The operation unit 10 includes an on / off button BT for controlling the supply of power, a volume controller VA for adjusting the volume of the speaker SP, a display DS for displaying various characters and graphics, Plays the MP3 file selected from the list of MP3 files displayed on the display DS and moves up / down button UD to move forwards or backwards through the list of MP3 files displayed on the display DS, or A compact disc (CD) type MP3 player comprising a play / stop button (PS) for stopping playback of an MP3 file. The method of claim 1, The compact disc (CD) is composed of a ROM (Read Only Memory) type compact disc that stores not only data in the form of MP3 files compressed with music, but also other types of audio data. The compact disc accommodating part 20 is a compact disc (CD) type MP3 player, characterized in that the compact disc (CD) is carried in and out of space, rotary motor, opening and closing buttons and the like. The method of claim 1, The servo control unit (30) is a compact disc (CD) type MP3 player, characterized in that it comprises a motor drive device and an optical pickup device. The method of claim 1, The data processing device 40 includes a microprocessor 41 for executing various programs while inputting and outputting various control signals, a digital signal processing device 42 for signal processing and decoding digital data, and a storage device for temporarily storing data. (43), an MP3 decoder (44) for decoding an MP3 file, and a digital-to-analog converter (45) for converting digital data to analog data. The method of claim 1, The output device 50 is a compact disc (CD) type, characterized in that it comprises an amplifier (AP) for amplifying the analog signal at a predetermined ratio and a speaker (SP) for outputting the amplified signal in the form of sound MP3 player.