KR200210930Y1 - multi-slots type multi-media card changer player compatible with CD changer player - Google Patents

Abstract

The present invention discloses a multi-slot multimedia card changer player compatible with the CD changer player. The multi-slot multimedia card player of the present invention comprises a front panel unit having a plurality of slots for inserting a multimedia card, a signal processing circuit for reading out data recorded on the multimedia card and performing predetermined signal processing, and the front panel unit. And a case for incorporating the signal processing circuit unit, and a socket for connecting to the vehicle CD changer player having a function of receiving data recorded on the CD from the CD changer and reproducing it by voice. The multi-slot multimedia card player employs the same communication protocol as the communication protocol applied to the CD changer and the CD changer playback period in relation to the CD changer player, and performs data communication through the socket. The multi-slot multimedia card player is configured to read and decode data of a designated multimedia card in response to a command transmitted through the socket from the CD changer player, convert the data into an analog signal, and transmit the analog signal to the CD changer player. Is regarded as a CD changer and operates in relation to the CD changer player.

Description

Multi-slots type multi-media card changer player compatible with CD changer player}

The present invention relates to a multi-media card (MMC) player having a changer function. More specifically, the multi-slot multimedia card player is regarded as a CD changer and operates in relation to the CD changer player. The present invention relates to a multi-slot multimedia card changer player that is constructed and compatible with existing compact disc changer player.

Recently, as a next generation of a storage medium using an optical recording method such as a CD-ROM, a data recording medium manufactured in a card form by embedding a flash memory has been in the spotlight. This memory card is called a multimedia card (MMC) or a smart card (Smart card).

You need a player to use this multimedia card as a sound source. A representative example of a multimedia card player is a digital data player such as an MP3 player. MP3 player is a self-contained player. That is, it decodes the sound source data recorded on the multimedia card and finally outputs the playback sound through the earphone jack.

Recently, however, a system using a multimedia card in combination with an audio system of a vehicle has been introduced. For reference, in order to use a multimedia card as a sound source of an audio system of a vehicle, a multimedia card player is required. By utilizing the resources of the car's audio system, the player in this case can simplify its configuration rather than a typical MP3 player. That is, the player does not need to provide resources such as an analog playback circuit or a speaker provided in the vehicle audio system, and the digital sound source data recorded in the multimedia card is made into an audio signal required by the vehicle audio system. You can have a configuration that can give.

Some vehicles have a CD-ROM changer and a CD-ROM changer player. In such a system, the CD-ROM changer player provides the CD-ROM changer with information for selecting a desired CD-ROM by the CD-ROM changer and a predetermined protocol, and the CD-ROM changer responds to the indicated CD-ROM among a plurality of CD-ROMs mounted therein. Select to read and decode the sound source data recorded there, convert the analog signal and provide it to the CD-ROM changer player. The CD-ROM changer player outputs the received analog signal through the speaker.

If the vehicle is equipped with such a system, a more efficient approach is required in constructing a playback system for utilizing a multimedia card as a sound source. In other words, it is necessary to configure a system that does not have redundant resources if possible. Here, the CD-ROM changer and the multimedia card changer player cannot be shared due to the characteristics of the recording medium and must be configured independently, but the CD-ROM changer player can be shared. The CD-ROM changer is a supply device of sound source data when viewed by a CD-ROM changer player. In addition, between these two parties, a contracted communication protocol is used to accurately receive and reproduce sound source data of a desired CD-ROM. Therefore, if the multimedia card changer player is configured to satisfy the communication protocol applied between the CD-ROM changer and the CD-ROM changer player and at the same time as the device for supplying the sound source data that the CD-ROM changer is responsible for, such a multimedia card changer player It can be connected to the CD-ROM changer player as a substitute for the changer. As a result, the CD-ROM changer player can be compatible not only with a CD-ROM changer but also with a multimedia card changer player, so that resources can be shared.

In view of the above points, the present invention can selectively play a desired multimedia card by simultaneously inserting multiple multimedia cards, and the multi-slot having a stable structure in which the multimedia card is not detached or unstable in contact with external shocks. In addition, the present invention provides a multi-slot multimedia card changer player that is connected to an existing CD changer player installed in a vehicle and configured to be recognized and operate like a CD changer and is compatible with an existing CD changer player. do.

1 shows the appearance and use of a multi-slot multimedia card player according to the present invention.

2 is a block diagram showing a configuration of a signal processing circuit unit installed in a multi-slot multimedia card player according to the present invention.

3 shows a terminal connection relationship between a micom of a multimedia card changer player and a master micom of a CD changer player.

4 is a flowchart illustrating a 'playing operation' of the multi-slot multimedia card player according to the present invention.

5 is a diagram illustrating a connection relationship between a microcomputer and a multimedia card for detecting whether a multimedia card is attached or detached to a slot.

6 is a flowchart for explaining the detection and detachment of a multimedia card to a slot during a 'playback operation'.

<Explanation of symbols for main parts of the drawings>

10: Multimedia card changer player 20: Front panel

30: Card insertion slot 40: Cover

42: rib guard 50A: upper case

50B: lower case 60: multimedia card

70: micom 72: card selection unit

74: power supply 76: decoder

78: digital-to-analog converter 80: first amplifier

82: second amplifier 84: socket

86: cable 100: CD changer player

102: operation button unit 110: speaker unit

In order to achieve the above object, the present invention provides a front panel unit having a plurality of slots for inserting a multimedia card, a signal processing circuit for reading out data recorded on the multimedia card and performing predetermined signal processing, and the front panel. A multislot multimedia having a case coupled to the unit and a socket for connecting to a vehicle CD changer player having a function of receiving data recorded on the CD from the CD changer and reproducing it by voice; As a card player,

The multi-slot multimedia card player employs the same communication protocol as the communication protocol applied to the CD changer and the CD changer playback period in relation to the CD changer player, and performs data communication through the socket. Is configured to read and decode data of a designated multimedia card in response to a command transmitted through the socket from the CD changer player, convert the data into an analog signal, and transmit the same to the CD changer player.

The multi-slot multimedia card player provides a multi-slot multimedia card player, characterized in that configured to be recognized and operate as a CD changer in relation to the CD changer player.

The signal processing circuit unit generates card selection information for selecting a specific multimedia card among a plurality of multimedia cards inserted into a slot of the front panel unit in response to a command of the CD changer player transmitted from the socket, and the selected multimedia card. A microcomputer to read recorded data of the microcomputer; A card selection unit which receives the card selection information and selects and enables a multimedia card inserted into a specific slot so that the microcomputer can read data from the selected multimedia card; A decoder which receives the data from the microcomputer and applies the decoding method corresponding to the coding method of the data to decode the data; A digital / analog converter for converting the digital data decoded by the decoder into an analog signal; A signal amplifier for amplifying the analog signal converted by the digital / analog converter and transferring the analog signal to the CD changer player through the socket; And a power supply unit for supplying driving power to each of the components.

Preferably, the digital / analog converter separates and outputs the decoded data into an R-channel signal and an L-channel signal, and the signal amplifier includes a first amplifier for amplifying and outputting the R-channel signal. And a second amplifier for amplifying and outputting the L-channel signal.

In addition, a pull-up resistor is connected to the connection line between the first detection terminal of the microcomputer and the second detection terminal of each multimedia card, and the microcomputer periodically checks the potential level of the first detection terminal by using a timer interrupt. And whether the multimedia card is attached or detached from the slot corresponding to the card selection information at all times.

Meanwhile, the multimedia card player further includes a cover that covers the front panel and supports the multimedia card inserted into the slot so as to stably connect with the connection terminal of the printed circuit board set. The cover has a cover plate having a width that can cover the front of the front panel portion and a latch beam protruding across a central portion of the cover plate. One edge of the cover plate is rotatably coupled to one edge of the front panel portion, and has a structure that stably supports the multimedia card inserted into the slot when the lid is closed.

Further, the slot of the front panel portion, when the multimedia card is inserted, the center portion of one corner is exposed to the outside of the slot, so that the side shape so that the user can grasp the multimedia card inserted in the slot by hand by hand It is round in a bow shape.

Other features and advantages of the present invention will become more apparent with reference to the following detailed description and accompanying drawings that illustrate the features of various embodiments of the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to a preferred embodiment of the present invention.

1 illustrates the appearance of a multi-slot multimedia card player 10 according to the present invention. In the appearance configuration of the multimedia card player 10, the player 10 is coupled to the front panel portion 20 and the front panel portion 20 is a printed circuit board set equipped with a signal processing circuit portion shown in FIG. It has a case (50A, 50B) having a structure that can be built. The cases 50A and 50B are composed of an upper case 50A and a lower case 50B in consideration of assemblability. The signal processing circuit portion of Fig. 2 is connected to the socket 84 via a cable 86, which is connected to the CD-ROM changer regenerator 100 installed in the vehicle. A pair of speakers 110 are connected to the CD-ROM changer player 100.

The front panel unit 20 of the multimedia card player 10 has a plurality of slots for inserting a multimedia card. When the slot 30 is inserted into the multimedia card 60c as shown, the center portion of one corner is exposed to the outside of the slot, the user can grasp the multimedia card inserted in the slot 30 by hand by hand. So that its side shape has a round shape with a bow shape. In addition, the front panel unit 20 is provided with a license plate for assigning a serial number to each of the plurality of slots 30.

On the other hand, in order to prevent the multimedia card from being detached from the slot 30 or the terminal connection of the multimedia card in spite of the external vibration or impact of the multimedia card inserted into the slot 30, the player 10 is covered with a cover. 40 is further provided. The cover 40 covers the front panel 20 to support the multimedia card inserted in the slot 30 so that the connection with the signal processing circuit can be stably maintained. The cover 40 has a latch beam 42 protruding across the center portion of the cover plate having a width that can cover the front of the front panel portion 20. In addition, the cover 40 is rotatably coupled to one side edge of the front panel portion 20 and one side edge thereof to open and close the cover 40, and the latch beam 42 when the cover 40 is closed. ) Is in contact with the multimedia card (60c) is inserted into the slot 30 has a structure that supports stably.

Fig. 2 shows a signal processing circuit for reading out data recorded on the multimedia card and performing predetermined signal processing. This signal processing circuit includes a microcomputer 70, a card selector 72, a power supply 74, a decoder 76, a digital-to-analog converter 78, and signal amplifiers 80 and 82. The signal processing circuit and the CD changer player 100 are connected to exchange signals through the socket 84.

The microcomputer 70 is operated by receiving the operating power from the power supply unit 74, and in response to an operation command instructed by the CD changer player 100 from the socket 84 by a built-in operation program, By controlling the operation, card selection information for selecting a specific multimedia card among a plurality of multimedia cards inserted into the slot is generated, and the recorded data of the selected multimedia card is read and provided to the decoder 76. To this end, the microcomputer 70 is connected to the socket 84, the multimedia card 60, the card selector 72, the decoder 76, the digital-to-analog converter 78 as shown.

When the user selects a specific slot by operating the operation button unit 102 provided in the CD-ROM changer player 100, the microcomputer 70 receives the selection information through the socket 84 to select a corresponding multimedia card. The card selection information CLK [0: 5] is provided to the card selection unit 72 and the card detection end outputs the detection signal DET [0: 7] to check whether the multimedia card is inserted into the corresponding slot.

Always checking whether the multimedia card 60c is inserted into the slot 30 is made by the configuration shown in FIG. That is, the detection terminal DET of the multimedia card 60c and the card detection terminal of the microcomputer 70 are connected by a connection line, and a pull-up resistor R is connected to the connection line. When such a connection is made, when the multimedia card 60c is not inserted into the slot, the card detecting end of the microcomputer 70 detects a 'high' state by a pull-up, and conversely, the multimedia card 60c is inserted into the slot 30. When inserted, the ground voltage, or 'low' state, is detected. As such, the microcomputer 70 may recognize the presence of the multimedia card as a difference in the logic level of the card detection unit.

When it is confirmed that the multimedia card 60c exists in the slot 30, the microcomputer 70 transmits a command signal CMD for reading data to the corresponding multimedia card and reads data DATA from the multimedia card.

In order to support such a read operation of the microcomputer 70, the card selector 72 receives the card selection information CLK [0: 5] from the microcomputer 70, decodes the received card selection information CLK [0: 5], and then decodes it into a specific slot. One inserted multimedia card is selected and enabled so that the microcomputer 70 can read data from the selected multimedia card.

In addition, the microcomputer 70 supplies the driving signal LEDs [0: 7] to the light emitting diodes (LEDs) provided in the respective multimedia card slots 30. That is, a light emitting diode corresponding to the light emitting diode receives a driving signal to emit light in the currently selected slot, thereby illuminating only the number of the license plate corresponding to the light emitting diode so as to visually recognize which slot is currently selected.

The decoder 76 receives the data from the microcomputer and decodes the data by applying a decoding method corresponding to the coding method of the data. For example, when the sound source data recorded on the multimedia card 60 is an MP3 file, a decoder having an MP3 decoding function is employed.

The digital / analog converter 78 converts the digital data decoded by the decoder 76 into an analog signal. The digital / analog converter 78 separates the decoded data into R-channel signals and L-channel signals, respectively.

Accordingly, the signal amplifiers 80 and 82 include a first amplifier 80 for amplifying and outputting the R-channel signal and a second amplifier 82 for amplifying and outputting the L-channel signal. Amplify R-channel and L-channel analog signals separately. The amplified signal is provided to the CD changer player 100 through the socket 84 and finally outputted as voice through the speaker 110.

3 shows a connection relationship for explaining the communication protocol between the microcomputer 70 of the multimedia card player 10 and the master microcomputer 104 embedded in the CD changer player 100, which is a pin arrangement of the socket 84. As shown in FIG. Corresponds to. Terminals 1 and 3 transmit R-channel and L_channel analog signals to the master microcomputer 104, and terminal 2 functions as a ground terminal for the analog signals. The terminal 7 is supplied with a driving voltage of 12 [V] to the power supply unit 74, and the terminal 6 is supplied with an operation control signal for controlling power to be supplied to each part of the multimedia card player, thereby providing transistors Q1 and Q2. Is applied to the base of the. That is, the transistor Q1 is turned on by the operation control signal having a 'high' value, and the power supply of the power supply unit is supplied to the signal amplifiers 80 and 82 and the decoder 76 through the transistor Q1, and the transistor Q2 is also turned on and supplied. The voltage Vcc is supplied to the microcomputer 70 and the microcomputer 70 is reset to enter the operation start state. Command terminal 8 transmits command data on the operation contents instructed by the user to the microcomputer 70. Here, the pull-up resistors R1, R2, R3, and R4 are coupled to the connection line of the eighth terminal so that the data communication can be performed bidirectionally between the microcomputer 70 and the master microcomputer 104. In particular, through this terminal 8, the microcomputer 70 and the master microcomputer 104, for example, 'play', 'stop', 'pause' or go according to a predetermined protocol (search or jump) ', etc., to execute the user's execution command and the corresponding operation is possible.

In particular, in the multimedia card player of the present invention, the driving power (BU + 12V) required by the existing CD changer is used as a power source for driving the microcomputer 70, the power supply unit 74, and the multimedia card. The control signal was used as a power switching signal of the signal amplifiers 80 and 82 and the decoder 78 and connected to the reset terminal of the microcomputer 70. As a result, the operation control signal for turning on / off the mechanism of the existing CD changer may be used as a signal for resetting the microcomputer 70 in the present invention.

As such, the communication protocol defined in the connection relationship between the microcomputer 70 and the master microcomputer 104 is equivalent to that of the existing CD changer and the CD changer player 100. Therefore, when the multimedia card player 10 is connected to the CD changer player 100 instead of the existing CD changer, the multimedia card player 10 is the same as the existing CD changer from the standpoint of the CD changer player 100. Can be recognized.

On the other hand, Figure 4 is a flow chart for explaining the 'play operation' of the multi-slot multimedia card player according to the present invention. When the user turns on the CD changer player 10 (step S10), the operation control signal is 'high' and the microcomputer 70 is supplied with driving power and reset to check whether the multimedia card exists in the designated slot. Initializing the multimedia card inserted into the slot 30 and transmits the result to the CD changer player (100) (S12).

After confirming the existence of the multimedia card, the master microcomputer 104 transmits command data corresponding to a user's operation instruction to the microcomputer 70, and the microcomputer 70 periodically monitors whether such command data is delivered ( Step S16). After determining whether the command data is a command to instruct an operation, a command processing routine corresponding thereto is performed. If the command is a 'play' command (step S18), the microcomputer 70 receives data from the multimedia card. It reads (step S22) and delivers it to the decoder 76 so that sound source data can be decoded (step S24). Subsequently, the decoded digital data is transferred to the digital-to-analog converter 78 and the signal amplifiers 80 and 82 to be converted into analog data, and then the CD changer player 100 is passed through the socket 84 through a signal amplification process. It is delivered to, and finally output through the speaker 110 as a sound (S26, S28 step).

When the operation indicated by the user is other than 'play', the operation routine corresponding thereto is processed (step S20).

6 is a flowchart for explaining detection of detachment of a multimedia card from a slot during a 'playback operation'. The multimedia card player 10 of the present invention is able to recognize the multimedia card being played, as well as other multimedia cards, while being detached from the slot 30 at random.

As mentioned above, when the power is supplied to the multimedia card player 10, the microcomputer 70 first checks each slot in turn to check the existence of the multimedia card, and the multimedia card in which the slot exists is initialized and its tracks. Information and the like are transmitted to the CD changer player 100. However, unlike the CD changer 10, the multimedia card player 10 has a feature of randomly attaching and detaching a multimedia card to a slot while playing. Therefore, there is a need for a technology capable of recognizing a multimedia card newly detached during playback.

The hardware configuration for this is to use the pull-up resistor in Figure 5 described above. That is, when the multimedia card is inserted into the slot, the detection terminal DET connected to the pull-up is changed in potential from high level to low level. Therefore, even if the other multimedia card is removed while playing, the microcomputer 70 completes the playback of the currently playing multimedia card (step S30), and then checks whether the multimedia card is detached or not when the multimedia card is in the slot order (S30). In step S32), if there is a multimedia card in the slot (step S34), the multimedia card is initialized (step S36). Then, since the card information recorded on the multimedia card is read and transmitted to the CD changer player 100 (step S38), unlike the existing CD changer, there is no problem in recognizing it even if the multimedia card is detached during playback. .

As can be seen from the above description, the multimedia card player according to the present invention connects the cable to the multimedia card player of the present invention without changing any device while using the existing CD changer player as it is. The CD changer player simply recognizes the multimedia card player as a CD changer so that it can be operated. Therefore, it is possible to make full use of the resources of the existing CD changer player or the audio reproducing apparatus provided in the car audio system, and thus the configuration of the multimedia card player can be easily configured to the maximum.

In addition, the multimedia card player allows a user to select and play multiple multimedia cards at the same time in a single player, and also to play a multimedia card in another slot while playing a multimedia card inserted in one slot. This can be recognized by a simple configuration even if it is inserted or removed, allowing the user to select a wide range of sound source data and provide user convenience.

Furthermore, the slot on the front panel of the multimedia card player is rounded so that the multimedia card can be pulled out by hand without using a separate ejector or other tool. Due to the impact, the multimedia card is not detached from the slot or the contact becomes unstable, so that the playback sound can be stably enjoyed.

Although described above with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and changed within the scope of the present invention without departing from the spirit and scope of the present invention described in the claims You can. Accordingly, all changes that come within the meaning or range of equivalency of the claims are to be embraced within their scope.

Claims (7)

A front panel portion having a plurality of multimedia card insertion slots, a signal processing circuit portion for reading out data recorded on the multimedia card and performing a predetermined signal processing, and incorporating the signal processing circuit portion in combination with the front panel portion A multi-slot multimedia card player having a case and a socket for connecting to a vehicle CD changer player having a function of receiving data recorded on a CD from the CD changer and reproducing by voice. The multi-slot multimedia card player employs the same communication protocol as the communication protocol applied to the CD changer and the CD changer playback period in relation to the CD changer player, and performs data communication through the socket. Is configured to read and decode data of a designated multimedia card in response to a command transmitted through the socket from the CD changer player, convert the data into an analog signal, and transmit the same to the CD changer player. And the multi-slot multimedia card player is configured to be recognized and operate as a CD changer in relation to the CD changer player. The plurality of signal processing circuits of claim 1, wherein the signal processing circuit part is inserted into a slot of the front panel part in response to a command of the CD changer player transmitted from the socket. A microcomputer for generating card selection information for selecting a specific multimedia card among the multimedia cards and reading recorded data of the selected multimedia card; A card selection unit which receives the card selection information and selects and enables a multimedia card inserted into a specific slot so that the microcomputer can read data from the selected multimedia card; A decoder which receives the data from the microcomputer and applies the decoding method corresponding to the coding method of the data to decode the data; A digital / analog converter for converting the digital data decoded by the decoder into an analog signal; A signal amplifier for amplifying the analog signal converted by the digital / analog converter and transferring the analog signal to the CD changer player through the socket; And And a power supply unit for supplying driving power to each of the components. The first amplifier of claim 1, wherein the digital / analog converter separates and outputs the decoded data into an R-channel signal and an L-channel signal, and the signal amplifying unit amplifies and outputs the R-channel signal. And a second amplifier for amplifying and outputting the L-channel signal. The method of claim 1, wherein a pull-up resistor is connected to the connection line between the first detection terminal of the micom and the second detection terminal of each multimedia card, and the micom uses a timer interrupt to set the potential level of the first detection terminal. Checking periodically, the multi-slot multimedia card player, characterized in that it has a configuration that can always recognize whether the multimedia card is attached or detached to the slot corresponding to the card selection information. The multi-slot multimedia card player according to claim 1, further comprising a cover which covers the front panel and supports the multimedia card inserted into the slot so as to be stably connected to the connection terminal of the printed circuit board set. . The method of claim 5, wherein the cover has a cover plate having a width that can cover the front of the front panel portion and a latch beam protruding across the center portion of the cover plate, One side edge of the cover plate is rotatably coupled to one side edge of the front panel portion, and when the cover is closed, the latch is in contact with the multimedia card inserted into the slot to stably support the structure. Multi-slot multimedia card player. The slot of claim 1, wherein the slot of the front panel portion is exposed to the outside of the slot when the multimedia card is inserted, so that the user can grasp the multimedia card inserted into the slot by hand and pull it out. Multi-slot multimedia card player, characterized in that the side shape is a bow.