KR20040078379A - Mp3 multi-controller for car and signal analysis algothim - Google Patents

Abstract

PURPOSE: An MP3 multi controller for a car is provided to receive control signals through an 8-pin cable, and to control a CD-ROM drive to perform specific functions corresponding to each control signal, in order to directly utilize a control panel of a car audio. CONSTITUTION: A CD-ROM drive(10) reproduces data. An outer input device(20) transmits the data. A microcomputer(110) has a data conversion program for generating specific control signals according to a data signal transmitted from a car audio(200), and controls an MP3 decoder(140) by specific control signals generated by performing a predetermined control operation according to a driving program recorded in a ROM. The MP3 decoder(140) decodes MP3 data, and converts it into audio data. A DAC(150) re-converts the audio data into an analog audio signal. An 8-pin cable(30) transmits the control signals to the microcomputer(110), and transmits the analog audio signal to the car audio(200). A control panel generates the data signal. The car audio(200) outputs the audio signal through a speaker(210).

Description

MP3 MULTI-CONTROLLER FOR CAR AND SIGNAL ANALYSIS ALGOTHIM for Vehicles

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an MP3 player for use in a vehicle, and in particular, a compact disc in which MP3 data is stored in a CDROM drive used in a general computer. In addition to listening to music through the car audio, the user can press the function buttons such as track 1, stop, and track 2 on the control panel of the car audio CD drive according to the selected operation. The present invention relates to an MP3 multi-controller (MPC Multi-Controller; MMC) for controlling to perform a specified operation.

In general, the car audio in the car is basically equipped with a radio and a cassette player to listen to the radio or listen to music on a tape, but the CD player driving the compact disc has a cost-effective effect and space utilization. Or, due to the hassle of the replacement of the CD was not installed additionally, or a separate CD changer (CD Changer) was often provided inside other parts of the vehicle, for example.

The CD changer is equipped with a plurality of CDs at once, and under the control of the control panel of the car audio, the user can play the desired CD, or find the desired track and play more effective use, such as the advantage of enabling the cable Since it is connected through the inside of the vehicle, there was a problem that excessive time and cost according to the mounting.

On the other hand, the car audio is provided with a control panel on the front, the control panel is a device such as a radio, cassette player (CD Player), CD player (CD Player) to support the additional installation of the CD player or CD changer There are a plurality of selection buttons for selecting an operation and a plurality of function buttons predetermined to perform a specific operation according to the selected device.

The CD is a record made using a pulse signal modulation (PCM) method that converts an audio signal to digital at high speed for recording and reproducing music, and then fixes the audio signal at the time of reproduction. Then, the laser beam is used to detect and reproduce the signal stored in the groove.

The CD has a low noise and excellent sound quality because the reproduction method is made by non-contacting by laser beam, but has a disadvantage of having a limited storage time such as 74 minutes or 80 minutes due to the large data capacity of the voice signal.

Therefore, various studies have been conducted to reduce the data capacity of the audio signal, and a recently generalized method is the MP3 compression method.

The MPEG Audio Layer-3 (MP3) is one of the high-quality audio compression techniques defined by MPEG1, and because of the advantage that it can be compressed to 50 times that of a normal CD while maintaining sound quality close to a general CD, It is widely used for audio on demand (AOD) and internet FM radio broadcasting on the Internet based on TCP.

Therefore, the CD can be inserted into a CD-ROM drive of a personal computer (PC), and the recorded songs can be extracted, compressed into MP3, and transferred to the Internet, as well as a CD-writer. You can save 130 to 150 MP3 songs on one CD, and then listen to music through a separate MP3 drive program on your computer, or listen to music through an external device with MP3 drive program. It may be.

On the other hand, since the car audio mounted on the vehicle does not have driving means for playing the MP3 data, a method of listening to music by connecting a separate external device through an external input port of the car audio and driving the external device is provided. Was used.

However, since the method requires driving the external device and connecting an external input port in order to listen to music stored in MP3, it is quite cumbersome, and in particular, a plurality of function buttons (1) provided in the control panel of the car audio Since the external device is not controlled by burn track play, random, stop, etc., the user selects and plays a desired music among a plurality of music stored as MP3 in the CD inserted in the external device, or in a random manner. There was a problem that can not use at all the functions provided in the conventional control panel such as playing this.

The present invention has been made to solve the above problems, connected to the CD (CDC) cable provided on the back of the car audio MP3 decoder embedded 8-pin cable of MP3 multi-controller built-in, again MP3 Multi After connecting the controller and the CD-ROM drive with the ID cable and the power cable, turn on the power of the car audio and press the CD selection button on the control panel to operate the MP3 Multi Controller. Converts three data into an analog audio signal and outputs the converted audio signal to a car audio speaker through an 8-pin cable, and a control signal generated when a user presses a specific function button on the control panel is output through an 8-pin cable. It is delivered to the controller so that it can perform a specific function corresponding to each control signal. By controlling the CD-ROM drive, it is an object of the present invention to provide a vehicle MP3 multi controller that can directly utilize the control panel provided in the car audio.

1 is a perspective view schematically illustrating a state in which an MPP multi controller for a vehicle according to the present invention is connected to a car audio;

FIG. 2 is an enlarged perspective view of the MP3 multi controller shown in FIG. 1;

3 is a block diagram schematically illustrating an operation state of an MP3 multi controller according to the present invention;

Figure 4 is a signal flow diagram schematically showing the data flow of MP3 multi-controller and car audio according to the present invention,

5A is a state diagram schematically illustrating that an 8-byte signal and a 2-byte signal cross over time in the signal flow diagram shown in FIG. 4;

5B is a schematic diagram illustrating an example in which a car audio is operated according to an 8-byte signal transmitted from an MP3 controller.

5C is a schematic diagram showing an example of a control name generated by an MP3 controller according to a 2-byte signal transmitted from a car audio;

6 is a block diagram schematically illustrating a process of receiving a 2-byte data signal transmitted from a car audio to a CD changer, analyzing the signal through a signal analysis algorithm, and storing the same in an MP3 controller.

FIG. 7 is a circuit diagram schematically illustrating a main circuit unit of an MPP multi controller for a vehicle as an embodiment of the present invention; FIG.

FIG. 8 is a circuit diagram schematically showing an MP3 decoder unit of an MP3 multi controller for a vehicle as an embodiment of the present invention;

FIG. 9 is a circuit diagram schematically illustrating a data interface unit of an MP3 multi controller for a vehicle according to an exemplary embodiment of the present invention.

<Brief description of symbols for the main parts of the drawings>

10: CDROM drive 20: External input device

30: 8-pin cable 40: CD-ROM power cable

50: ID cable

100: MP3 Multi Controller (MMC) 101: Serial Port

102: additional power connection 103: ID port

104: CD-ROM power connection 105: External input port

110: micro-controller 111: buffer

112: expansion port 113: connection port

114: address decoder 115: CD-ROM operation LED

120: RAM 130: ROM

140: MP3 Decoder 150: DAC

200: car audio 201: CD cable

202: control panel 203: CD changer

210: speaker

300: signal algorithm analysis unit 310: signal converter

320: signal capture 330: computer (PC)

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view schematically illustrating a state in which an MPP multi controller for a vehicle according to the present invention is connected to a car audio, FIG. 2 is an enlarged perspective view of the MP3 multi controller shown in FIG. 1, and FIG. FIG. 4 is a block diagram schematically showing an operation state of an MP3 multi controller according to the present invention. FIG. 4 is a signal flow diagram schematically showing a data flow between MP3 multi controller and car audio according to the present invention, and FIG. 5A is shown in FIG. FIG. 5B is a state diagram schematically illustrating the intersection of an 8-byte signal and a 2-byte signal according to time in the signal flow diagram, and FIG. 5B illustrates an example in which a car audio is operated according to an 8-byte signal transmitted from an MP3 controller. 5C is a schematic diagram illustrating an MP3 multi-controller generated according to a 2-byte signal transmitted from a car audio. Figure 6 is a schematic diagram showing the name of the embodiment, Figure 6 is a block diagram showing a schematic diagram of the process of receiving a two-byte data signal transmitted from the car audio to the CD changer through a signal analysis algorithm and stored in the MP3 multi controller 7 is a circuit diagram schematically showing a main circuit unit of an MP3 multi controller for a vehicle as an embodiment of the present invention, and FIG. 8 is an MP3 decoder unit of an MP3 multi controller for a vehicle as an embodiment of the present invention. FIG. 9 is a circuit diagram schematically illustrating a data interface of an MP3 multi controller for a vehicle as an embodiment of the present invention.

As shown in FIG. 1, the vehicle MP3 multi-controller 100 according to the present invention is connected to the CD cable 201 of the car audio 200 by an 8-pin cable 30 and used in a general computer. Since the ID is connected to the CD-ROM drive 10 through a cable 50, the CD-ROM drive 10 is controlled by receiving power and data signals through the 8-pin cable 30, and the CD-ROM drive 10 is a CD-ROM power source. Power is supplied from the MP3 Multi-Controller 100 through a cable 40, MP3 data of the CD inserted into the CD-ROM drive 10 through the built-in MP3 decoder 140 and the house 150 Converted to an analog audio signal and delivered to the car audio 200 through the 8-pin cable 30 is configured to allow the user to enjoy the desired music.

That is, the MP3 multi controller 100 has a serial port 101 for connecting an 8-pin cable 30 to the front side as shown in FIG. 2A, and an additional external device. Additional power connection 102 is provided to supply power to the.

In addition, as shown in FIG. 2B, the rear portion of the MP3 controller 100 is connected to an ID port 103 for connecting an ID cable 50 and a power terminal of the CD-ROM drive 10. A CD-ROM power supply unit 104 for supplying power to the drive 10 is provided, and a plurality of external input ports 105 are provided to support input from an external sound source generator.

Hereinafter, the internal operation of the MP3 multi-controller 100 according to the present invention will be described in detail according to the configuration portion by a block diagram.

MP3 multi-controller 100 according to the present invention is a CD-ROM drive 10 for reproducing the data stored in the CD as shown in Figure 3, the external provided in the MP3 multi-controller 100 as an external sound source playback device An external input device 20 for transferring data through the input port 105 and a data conversion program are built in the ROM 130 to generate a specific control signal according to the data signal transmitted from the car audio 200. By performing a predetermined control operation according to the recorded drive program, a microcomputer 110 for generating a specific control signal to control the MP3 decoder 140 and a ROM including a drive program for controlling the microcomputer 110 are stored. 130, and temporarily loading or buffering the data transferred from the CD-ROM drive 10 decodes the RAM 120 and the MP3 data transferred from the CD. An MP3 decoder 140 that decodes and converts the audio data into an audio data, a DAC 150 that reconverts the converted audio data into an analog audio signal, and a control generated from the car audio 200. The 8-pin cable 30 for transmitting the signal to the microcomputer 110 and at the same time the analog audio signal reconverted from the home 150 to the car audio 200, and the user can select the sound source device or operation state And a control panel 202 for generating a data signal so that the audio signal transmitted through the 8-pin cable 30 is output to the outside through the speaker 210 mounted on the vehicle. It is.

The CD cable 201 drawn out at the rear of the car audio 200 mounted on the vehicle is connected to the 8-pin cable 30, the 8-pin cable 30 is an embodiment of the present invention, the first pin The right audio output, pin 2 is CD changer on, pin 3 is data, pin 4 is battery power, pin 5 is ground, pin 6 is NC, pin 7 is left audio output, pin 8 is audio grounding. .

That is, the battery power of the vehicle is transferred to the MP3 multi controller 100 and the CD-ROM drive 10 according to the present invention through the fourth pin of the 8-pin cable 30, the car audio 200 and the third pin. Data exchange is performed between the MP3 controllers 100.

Therefore, as shown in FIG. 4, the 8-byte data signal ① generated by the MP3 multi controller 100 is periodically transmitted to the car audio 200 through pin 3 of the 8-pin cable 30. It is possible to display the information of the MP3 data currently being played in the LCD window (not shown) of the two-byte data signal generated when pressing the control panel 202 of the car audio 200 is an 8-pin cable It is transmitted to MP3 multi controller 100 through pin 3 of 30, and according to the transmitted data signal, the microcomputer 110 generates a predetermined control signal to drive MP3 decoder 140 to select the selected track. An operation such as outputting music is performed.

The flow of data for transmitting the 8-byte data signal ① and the 2-byte data signal ② through the pin 3 of the 8-pin cable 30 in the MP3 controller 100 and the car audio 200 is shown in FIG. 5a to 5c will be described in more detail.

As shown in FIG. 5A, the 8-byte data signal ① is periodically generated by the MP3 controller 100 according to the present invention so as to display a state where MP3 data of the CD-ROM drive 10 is executed. The two-byte data signal ② is a kind of interrupt signal that is generated temporarily when a user presses any function button on the control panel 202 of the car audio 200.

The 8-byte data signal (1) has an 8-byte data structure containing specific contents as shown in the embodiment of FIG. 5B, and during playback, a sound source generator, track display, The 8-byte data signal having the minute display and the second display is periodically generated and transmitted to the car audio 200 through the 8-pin cable 30.

That is, the MP3 controller 100 periodically generates a data signal value of the MP3 data that is currently driven, for example, an 8-byte data signal ① including CD, 5 tracks, 42 minutes, and 23 seconds. As time passes, the data signal value changes continuously.

In addition, when the two-byte data signal ② is generated, as shown in FIG. 5C, the microcomputer 110 generates a specific control signal designated according to the input data signal value. The MP3 decoder 140 is controlled according to the control signal to perform the selected operation.

For example, when the 2-byte data signal ② is inputted as (1, 2), the microcomputer 110 controls the MP3 decoder 140 to play from the initial track, and (2, 5) If input, it executes to play the next track of the music that is currently in progress. If (5, 7) is input, it executes to play track 3, and if (7, 5) is input, track 5 To play the game.

On the other hand, since the first byte of the two-byte data signal (2) is assigned to a specific instruction, the number of cases is a total of 256, and all car audios sold in Korea are included in the number of cases.

In general, since different types of car audio are installed in different vehicles, the first byte of the 2-byte data signal ② generated by the car audio may be different for each vehicle. However, since different commands are not set for the same data value of the first byte for compatibility between products, the present invention analyzes data values for all commercially available car audio, implements a signal analysis algorithm, and then codes data. The conversion program is embedded in the MP3 controller.

In the case where both 2-byte data values of the 2-byte data signal (2) are used as instructions, the same can be applied using the signal analysis algorithm.

That is, in the MP3 multi-controller 100 of the present invention, through the signal analysis of all the car audio 200 used in the vehicle, the two-byte data signal (②) when each function button is pressed is arranged in a table. In this case, even when the MP3 multi-controller 100 is connected to any car audio 200, the commands specified in the function buttons of the car audio 200 can be correctly executed.

Hereinafter, the data conversion and processing in the car audio 200 and the signal analysis algorithm analysis unit 300 mounted on the vehicle will be described step by step according to the block diagram shown in FIG. 6.

First, since a process of detecting an analog signal output from the car audio 200 is required, an input port of the CD cable 201 and the signal converter 310 connecting the car audio 200 and the CD changer 203 is required. (Not shown) is connected to receive the data signal output from the third pin of the CD cable (2010).

The analog signal transmitted to the input port of the signal converter 310 is converted into a digital signal through a sampling process.

The converted digital signal is captured by the signal capture unit 320 as a 2-byte digital signal and transferred to the computer (PC) 330.

The computer 330 displays the transmitted two-byte digital signal on a monitor (not shown) to accumulate and record the corresponding function button and the generated digital signal together, and separately displays and records the other digital signals when they are inputted. The 2-byte data signal according to the function button is organized into a table to implement a signal analysis algorithm (Algorithm) in which the 2-byte digital signal and one control signal are matched one-to-one.

The signal analysis algorithm is coded by a data conversion program and stored in the MP3 multi controller 100 by a ROM writer (not shown), so that when the user presses a function button of the car audio 200, the MP3 controller The control signal CD-ROM 10 is controlled by outputting a control signal corresponding thereto at 100.

That is, the data conversion program completed through the signal analysis algorithm analysis unit 300 to match the two-byte signal generated in the car audio 200 and the control signal of the MP3 controller corresponding to the specified command 100 As a conversion program, when a user presses a function button of the car audio 200, music data corresponding to MP3 data stored in the CD-ROM drive 10 is played.

Since the two-byte digital signal is specified for each function button, when controlling the MP3 decoder 140 through the microcomputer 110 to perform an operation according to the input of the two-byte digital signal, the car audio 200 It is possible to utilize all the functions specified in the control panel 202 of the) as it is.

On the other hand, as an embodiment for implementing the present invention, Figure 7 to Figure 9 constitutes a simplified circuit diagram, the components used in the circuit diagram can be replaced with other components to exhibit the same effect, the development of the technology Accordingly, since the one-chip circuit that integrates a plurality of components can be configured and used, the scope of the present invention is not limited by the above circuit diagram.

Switching unit of the present invention can not only play a general music CD or MP3 in the CD-ROM drive 10, but also to listen to music through the other external input device 20, and stable signal A well-known signal stabilization circuit is added for the operation, and since a well-known circuit generally used in the conventional switching circuit is used, a detailed description thereof will be omitted.

7 is a main circuit unit of the present invention, a data conversion program is stored in a built-in ROM so that a specific control signal can be generated according to a data signal transmitted from a car audio 200. The microcomputer 110 to control the MP3 decoder 140 by generating a specific control signal by performing a control operation of the ROM 130, a ROM 130 to store a drive program to control the microcomputer 110, and a CD-ROM drive ( RAM 120 temporarily loading the data transferred from 10) and the conversion data transferred from ROM 130, and a plurality of buffers 111 used as temporary data storages to prevent bottlenecks of data. And, an expansion port 112 for supporting input / output of the microcomputer 110 and other external devices, a plurality of connection ports 113 or jacks for connection with other circuits, and data decode of data. A plurality of circuit components for this consists of an electrical address decoder 114 connected to the.

The microcomputer (MCU) 110 is a small CPU (CPU) mainly used for control purposes, and unlike the CPU used in a general computer, a memory is often embedded in a chip.

As an embodiment of the present invention, a programmable 8052 series having 256 bytes of internal RAM and 8 KB of internal ROM is used, and a data conversion program is implemented in which a signal analysis algorithm stored in internal ROM is implemented. Is inserted or stored through the ROM writer in the manufacturing stage.

In addition, as another embodiment of the present invention, the microcomputer 110 may use AT89C51SND1C. The AT89C51SND1C has an internal memory in the form of EEPROM, so that a user can write and erase a program. There is an advantage that can be prepared, since there is a built-in decoder there is an advantage that the circuit design as a one-chip (One-chip) without the need for the MP3 decoder 140.

8 is an MP3 decoder unit of the present invention. The MP3 decoder 140 converts compressed data into a normal data signal according to a data signal and a control signal transmitted through the connection port 113, 150, the home 150 converts the data signal into an analog audio signal and transmits the data signal to the car audio 200 through the left and right audio pins of the 8-pin cable 30. At 200, MP3 can be played through the speaker 210.

Meanwhile, the digital to analogue converter (DAC) 150 is a device for converting a digital voice signal into an analog voice signal, and the audio data decompressed by the MP3 decoder 140 is a digital signal, which is car audio. In order to output through the speaker 210 of (200), it is necessary to convert back to an analog signal, and the device that performs this role is the home 150.

In the present invention, the house 150 is a reproduction method of a signal having a sampled discrete specific value, that is, a standard value. The DAC is converted into low-pass filtering after the D / A conversion of the discrete signal to the original analog signal. Will be handled closely.

9 is a schematic view of an interface unit according to the present invention, wherein the expansion port 112 is provided to support input / output with another external device, and the connection port 113 has a main circuit unit and an interface unit in one PC ratio. (PCB) can be omitted, and the CD-ROM operation LED 115 is provided to check the operation of the CD-ROM drive, the ID port 103 (IDE Port) is a CD-ROM drive 10 or A tape backup device or the like is configured to conform to the standard in an AT attachment packaged interface (ATAPI) for connecting to a general IDE interface.

The vehicle MP3 multi-controller 100 according to the present invention is an 8-pin cable of the MP3 multi-controller 100 in which the MP3 decoder 140 is built into the CD (CDC) cable provided at the rear of the car audio 200. Connect the 30, and again connect the MP3 Multi controller 100 and the CD-ROM drive 10 with the ID (IDE) cable (50) and the CD-ROM power cable (40), the power of the car audio (200) Turn on and press the CD (CDC) selection button in the control panel 202, the MP3 multi-controller 100 converts the MP3 data stored in the CD-ROM drive 10 to an analog audio signal and the converted audio signal To the speaker 210 of the car audio 200 through the 8-pin cable 30, the control signal generated when the user presses a specific function button of the control panel 202 through the 8-pin cable 30 Passed to MP3 multi controller 100 In the MP3 multi-controller 100, by controlling the CD-ROM drive 10 to perform a specific function corresponding to each control signal, it is possible to directly utilize the control panel 202 provided in the car audio 200. In addition to using all the functions of the car audio 200 mounted on the vehicle, a plurality of external input ports 105 and the additional power connection unit 102 provided in the MP3 controller 100 may be provided. There is an effect that can effectively utilize the external sound source device.

Claims (5)

In a car audio device, CD-ROM drive drive to play data stored in CD, external input device to transfer data through external input port provided in MP3 Multi Controller as external sound source playback device, and specific control according to data signal transmitted from car audio There is a built-in data conversion program to generate a signal and performs a predetermined control operation according to the drive program recorded in the ROM to generate a specific control signal to control the MP3 decoder and the drive program to control the micom. A ROM that is stored, a RAM that temporarily loads or buffers data transferred from the CD-ROM drive, and an MP3 decoder that decodes the MP3 data transferred from the CD into audio data. And converting the converted audio data into an analogue. DAC reconverting to audio signal, 8-pin cable for transmitting the control signal generated from the car audio to the microcomputer and transmitting the analog audio signal reconverted in the house to car audio, and the user Or a control panel for generating a data signal so as to select an operation state, wherein the analog audio signal transmitted through the 8-pin cable is output to the outside through a speaker mounted on a vehicle. Vehicle MP3 multi controller and signal analysis method. The method of claim 1, The microcomputer uses a programmable 8052 series having 256 bytes of internal RAM and 8 KB of internal ROM for a vehicle. The method of claim 1, The microcomputer has an internal memory in the form of EEPROM, which allows the user to write and erase programs, and uses the AT89C51SND1C, which enables one-chip design by replacing the MP3 decoder with an internal decoder. Multi controller and signal analysis method. In the signal analysis algorithm embedded in MP3 controller, Receiving a data signal output from pin 3 of the CD cable by connecting a CD cable connecting the car audio with the CD changer and an input port of the signal converter; Converting an analog signal transferred to an input port of the signal converter into a digital signal through a sampling process; Capturing the converted digital signal into a digital signal through a signal capture unit and transferring the converted digital signal to a computer (PC); The computer displays the transmitted digital signal on the monitor, accumulates and records the corresponding function button and the generated digital signal together, and separately displays and records the other digital signals when they are input. Implementing a signal analysis algorithm (Algorithm) in which the digital signal and one control signal are matched one-to-one; The signal analysis algorithm is encoded by a data conversion program (coded) and stored in the MP3 multi-controller (100) by a ROM writer, characterized in that the vehicle MP3 multi-controller and signal analysis method. The method of claim 4, wherein The signal capture unit displays a digital signal converted through a signal converter on a monitor of a computer in units of 2 bytes to accumulate and record a specific button and a generated digital signal together, and to separately record and record when a different digital signal is input. Vehicle MP3 multi-controller and signal analysis method characterized in that.