KR100385018B1 - Portable digital media playback apparatus - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital media playback device, which is connected to an external device and includes a communication terminal for receiving voice data from an external device, a power input terminal receiving power from the external device, and a first analog signal applied from the external device. One connector having an analog input terminal for receiving the; A memory unit for storing the voice data input through a connector; A signal processor which decodes the voice data stored in the memory unit and converts the voice data into a second analog signal; By setting a reference voltage of a certain size, if the size of the analog input signal is larger than the reference voltage, it is high. If it is smaller than the reference voltage, it is divided into low and the type of external device is identified according to the high and low. An interface unit for controlling a transmission speed of voice data transmitted from the external device to the memory unit according to the type of the external device; A mixer unit configured to mix and output a first analog signal input from an external device to a second analog signal converted and output from the signal processor according to the type of external device determined by the interface unit; And a power distribution unit connected to a power supply terminal for distributing power applied from an external device, thereby receiving power and digital data from the external device.

Description

Portable digital media playback apparatus

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable digital media playback device including MP3 and AAC. More particularly, the present invention relates to a portable digital media playback device by connecting to an external device including a mobile phone and a computer using a connection connector without a power supply unit in the main body. The present invention relates to a portable digital media player which is supplied with power for driving the device and is provided with additional functions.

The digital media player according to the prior art has a structure in which a battery power is essentially installed in the main body, and the size and weight of the battery power are factors that limit the miniaturization and weight of the portable digital media player. Frequent replacement of battery power is economically burdensome and cumbersome. In addition, if you need to work with a mobile device such as a VOICE RECORDER, a digital media player, and a widely used mobile phone, for example, you can call a mobile phone and simultaneously transfer the contents of the call to the digital voice storage device. Operations such as storing or mixing playback sounds from a digital media player to a mobile phone call counterpart and transmitting them to a mobile phone call were inconvenient and difficult.

The present invention is to solve the conventional problems as described above, and has a structure that can receive power from an external device such as a mobile phone or a computer, portable digital media playback device of a compact, lightweight structure that is easy to carry by reducing the weight and size It is intended to provide.

Another object of the present invention is to provide a portable digital media player having a structure of a connector for automatically detecting a connection between a computer communication port and a communication port of a mobile phone.

Still another object of the present invention is to provide a portable digital media player having a mixer comprising a simple circuit for synthesizing a signal generated from a digital media player and a signal input from an external device such as a mobile phone.

It is still another object of the present invention to provide a portable digital media player having a terminal configuration for minimizing interference between an analog signal and a digital signal input from an external device.

1 is a block diagram of a portable digital media player system according to an embodiment of the present invention.

2 is a diagram illustrating a use state of a portable digital media player of the present invention.

3 is a connector configuration diagram of a digital media player of the present invention.

4 is a circuit diagram of a mixer unit of the digital media player of the present invention.

5 is a connection structure diagram of a connection connector A for connecting a digital media player and a communication terminal (UART) of a mobile phone.

6 is a diagram illustrating a connection structure of a connection connector B for connecting a digital media player and a communication terminal (USB) of a computer.

7 is an enlarged view of a port portion inserted into an external connection terminal 61 of the portable digital media player of the present invention among the configurations of the connection connector A and the connection connector B;

***** Explanation of the main parts of the drawings *****

10: memory 11: RAM

12: ROM 13: Flash memory

20: CPU (CPU) 30: decoder processing unit

31 DS processor 32: A / D converter and D / A converter

33: Mixer Part 34: MIC AMP

35: speaker amplifier (SPK AMP) 40: microphone (MIKE)

50: Speaker 60: Connector Part

61: external connection terminal

62: microphone terminal (MIC) 63: speaker terminal (SPK)

64: power supply terminal (Vcc) 65: digital data transmission and reception terminal (Dp)

66: digital data transmission / reception terminal (Dm) 67: power supply terminal (GND)

70: USB Interface Part

80: General Interface Part

90: Control Key Pad Part

100: Display Part 110: Power Distributor

160: connection connector A 170: connection connector B

The above object of the present invention is a portable digital media playback device that reproduces voice data and is portable, which is connected to an external device, a communication terminal receiving voice data from an external device, a power input terminal receiving power from an external device, and A connector having an analog input terminal for receiving a first analog signal applied from an external device; A memory unit for storing the voice data input through a connector; A signal processor for decoding voice data stored in a memory unit and converting the voice data into a second analog signal; determining a reference voltage having a predetermined magnitude so that the magnitude of the reference voltage is high when the magnitude of the analog input signal is larger than the reference voltage; If smaller, the interface unit for separating the low (Low) to grasp the type of the external device according to the high and low, and controls the transmission rate of the voice data transmitted from the external device to the memory unit according to the type of the external device; A mixer unit configured to mix and output a first analog signal input from an external device to a second analog signal converted and output from the signal processor according to the type of external device determined by the interface unit; And a power distribution unit connected to a power supply terminal for distributing power applied from an external device, thereby enabling a portable digital media playback device to receive power and digital data from the external device. In addition, the above object of the present invention, portable digital media playback apparatus that can play voice data and is portable, connected to an external device, a communication terminal for receiving voice data from an external device, a power source receiving power from an external device A connector having an input terminal and an analog input terminal for receiving a first analog signal applied from an external device; A memory unit for storing voice data input through the connector; A signal processor which decodes the voice data stored in the memory unit and converts the voice data into a second analog signal; By setting a reference voltage of a certain size, if the size of the analog input signal is larger than the reference voltage, it is high. If it is smaller than the reference voltage, it is divided into low and the type of external device is identified according to the high and low. An interface unit for controlling a transmission speed of voice data transmitted from the external device to the memory unit according to the type of the external device; A power distribution unit connected to a power supply terminal for distributing power applied from an external device; And an output device for outputting a second analog signal, which can be achieved by a portable digital media player which can receive power and digital data from an external device, wherein the output device is a speaker jack or an earphone jack. In addition, the object of the present invention is to achieve at least one of a plurality of power input terminals are arranged in the middle, a plurality of analog signal transmission and reception terminals and the plurality of digital data transmission and reception terminals are each adjacent to the center arrangement The plurality of analog signal transmitting and receiving terminals and the plurality of digital data transmitting and receiving terminals, wherein at least one of the remaining power input terminals other than the centrally arranged power input terminal is disposed on the opposite sides with respect to the plurality of power supply terminals. With connector made It can be accomplished by a portable digital media player.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings. 1 is a configuration diagram of a portable digital media player system according to an embodiment of the present invention, wherein the digital media player includes a memory unit 10, a CPI 20, a decoder processing unit 30, and a microphone for receiving sound from an external device. 40), a speaker (SPK; 50) for outputting sound to the outside, a connector (60) for connecting with an external digital device such as a mobile phone or a computer, and a power distribution unit for supplying power applied from an external device to each functional block; (Power Distributor; 110), USB Interface Part (70) for transmitting / receiving digital data with an external device connected via USB (Universal Serial Bus), and general input / output signal processing and another external device and digital General Purpose Interface (80) in charge of data transmission and reception, the control keypad 90 for receiving user input from the outside and the status of the digital media player User consists of a display portion 100 for display to. The decoder processor 30 may include a DSP processor 31, an A / D and D / A converter 32, a mixer 33, a microphone amplifier 34, and a speaker amplifier 35. It is composed of As shown in FIG. 1, the decoder processing unit 30 may be provided by one chip or may be configured by several chips.

In the above configuration, the CPI 20 controls the operation of the entire system and performs a system operation program such as automatically detecting the connection of the external device through the universal interface unit 80 and executing the corresponding communication program. The memory unit 10 includes a ROM 12 for storing a system control program such as a download program, a voice and call recording program, a communication program, a RAM 11 for storing data used for system operation, and digital media data or voice. And a flash memory (FLASH MEMORY) 13 for storing. The decoder processing unit 30 synthesizes the signals input from the two sources using the mixer unit 33, or converts the voice analog signal into digital data using the A / D and D / A converters, or converts the digital data into analog data. Function to decompress and play digital media data in real time according to control signal of CPI 20 by converting to signal or DSP processor 31, or converting voice signal input from external device into digital data and then compressing it. Do it.

The USB interface unit 70 is a circuit for transmitting and receiving digital data with an external device connected via USB according to a control signal of the CPI 20 generated by a type of external device. When connecting to a computer via USB, digital data transmitted / received to the Dp terminal 65 and the Dm terminal 66 of the connector 60 by the control signal of the CPI 20 is used by the CUI 20 data bus. To the memory unit 10 at a transmission rate of 12 Mbps. As a circuit responsible for serial data transmission and reception with an external device connected to a USB device, a detailed circuit technology will be omitted since such a circuit configuration is a known technology.

The control keypad unit 90 functions to deliver digital media playback from the user, search before and after media, record and voice recording during a call, and mix (MIX) the playback sound of the digital media during a call when connected to a mobile phone, It is an input device for receiving input for controlling the download function of digital media.

The display unit 100 is a display unit which informs the user of the state of the digital media player. The universal interface unit 80 is connected to the control keypad 90 and the display unit 100 to perform input / output, and transfers the control signal generated from the connector to the CPI 20 according to the type of external device, and connects to the mobile phone. When a call is made in a closed state, a control signal for bringing the analog switch of the mixer 33 into the closed state is output and transmitted to the mixer 33, and the serial communication ports Rx and Tx are provided with terminals. It is responsible for transmitting and receiving digital data when connected to other external devices. The universal interface unit 80 may be implemented in a single chip with the CPI (20).

The connector 60 is a connection part for connecting a digital media player with an external device such as a mobile phone or a computer, and transmitting and receiving power, digital data and / or analog signals supplied from the external device, and through the connector 60. Power supplied from the device is distributed to each functional block through a power distributor 110. That is, the power divider 110 adjusts a voltage level for applying to each functional block by using power input from an external device and distributes power to each circuit functional block of FIG. 1. Philips TEA 1202TS chip was used as the power splitter 110 used in the present invention.

2 is an explanatory diagram of a use state of a portable digital media player of the present invention, wherein the portable digital media player is connected to a mobile phone through a connection connector A 160, 1) receives power, and 2) a mobile phone capable of data communication. In the case of downloading the digital media using the Internet communication network and stored in the memory unit 10 of the digital media player, or 3) the microphone terminal (62 of Fig. 3) and the headphone terminal (Fig. 3) of the portable digital media player 63), it is possible to transmit / receive a call, record during a call, and play a digital media by mixing with the transmit tone during a call. Digital data transmission and reception when connected to the UART of the mobile phone is performed by the Rp and Tx serial communication terminals of the Dp terminal 65 and Dm terminal 66 of the connector unit 60 and the universal interface unit 80 according to the control signal of the CPI 20. The connection will send and receive digital data at 115.2kbps or 230.4kbps.

The portable digital media player is connected to a computer through the connection connector B 170 to 1) receive power for driving the digital media, and 2) download the digital media from the computer.

When connected to a USB port of a computer, digital data is transmitted and received to the Dp terminal 65 and Dm terminal 66 of the connector unit 60 by the control signal of the CPI 20, and then input to the USB interface unit 70. . The USB interface unit 70 transmits and receives digital data using a transmission rate (12Mbps) and a transmission protocol suitable for USB. The digital data of the USB interface unit 70 is input and output to the memory unit 10 at a transmission rate of 12 Mbps using the data bus of the CPI.

In this case, the movement path of the digital data by the external device classification control signal (USB / UART control signal of FIG. 1) generated from the connector 60 uses the USB interface unit 70 or the universal interface unit 80. As described above, power input through the connector 60 is converted into an appropriate voltage level by the voltage divider 110 and then supplied to each functional unit.

3 is a connector configuration diagram of a digital media player of the present invention, wherein an external connection terminal 61 for connecting to an external device is a microphone terminal (MIC) 62 and a speaker terminal (SPK) 63 which are analog signal transmission / reception terminals. And power supply terminals (VDD, GND) 64 and 67, and digital data transmission and reception terminals (DP and DM) 65 and 66. The analog signal transmission and reception terminals 62 and 63 are applied to the decoder processing unit 30, and the speaker terminal 63 of the analog signal terminals is connected to the interface unit 80 as a control generation terminal for distinguishing an external device. The speaker terminal 63 is connected to a ground part and a relatively large value resistor before being connected to the internal functional block of the device, thereby preventing leakage current and simultaneously identifying the types of external devices connected to the digital media player. A voltage was allowed to be applied. In other words, when connected to a mobile phone, the speaker output is applied at 0 volts or AC component during a call, and the "LOW" voltage of the output of several tens of mV to several hundred mV or less is applied. . The universal interface unit 80 transmits the voltage applied to the speaker terminal 63 to the CPI 20, and the CPI 20 reads the appropriate control signal and then sends an appropriate control signal to the USB interface unit 70 or the universal interface unit 80. ), The appropriate communication speed and communication path are selected.

The power supply terminals (VDD, GND) 64 and 67 are connected to the power distributor 110 to supply power to external devices to the functional units of the digital media player, and the digital data transmission / reception terminals DP and DM 65 and 66 are connected to the USB interface 70 and the universal interface 80 to efficiently transmit and receive digital media data from an external device.

4 is a circuit diagram of a mixer unit of the digital media player of the present invention. The mixer unit 33 includes a first combining unit 120 having a two input and one output terminal, a second combining unit 130, a third combining unit 140, and a first analog switch 150. The first input terminal 121 and the second input terminal 122 of the first combining unit 120 are connected to the output terminal of the D / A converter 32 and the speaker terminal 63 of the connector 60, respectively, The output terminal 123 of the first combining unit 120 is connected to the input terminal of the speaker amplifier 35. The third input terminal 131 and the fourth input terminal 132 of the second combining unit 130 are connected to the speaker terminal 63 of the connector 60 and the output terminal of the amplifier 34 of the microphone, respectively, The output terminal 133 of the combiner 130 is connected to the input terminal of the A / D converter 32. The fifth input terminal 141 and the sixth input terminal 121 of the third combining unit 140 are connected to the output terminal of the amplifier 34 of the microphone and the output terminal of the D / A converter 32, respectively, The output terminal 143 of the combining unit 140 is connected to one end of the first analog switch 150. The other end of the first analog switch 150 is connected to the microphone terminal 62 of the connector 60 and is opened or closed by a mixer control signal. The microphone terminal of the connector 60 is connected to the audio input terminal of the external device and the sputter terminal of the connector 60 to the audio output terminal of the external device, respectively.

When the user operates the "play" button on the control keypad, the first analog switch is in an open state, and the digital media data stored in the compressed state in the form of MP3 or AAC bit stream in the memory unit 10 is stored in the DS process. After decompression through the (31) and reproduced as an analog signal using the D / A converter 32, and then through the first synthesis unit 120, input to the speaker amplifier 35, amplified and then headphones Alternatively, the user can hear the sound after converting the sound through the speaker 50. Here, the sprinkler amplifier 35 and the speaker 50 function as a voice output stage of the apparatus, and the microphone 40 and the microphone amplifier 34 function as voice input stages of the apparatus.

When the digital media player and the mobile phone of the present invention are connected, a telephone call can be made using the microphone 40 and the headphone 50 which are connected by using the digital media player. When a call is received through the cellular phone during the reproducing operation of the digital media player, the first analog switch 150 is closed by the mixer control signal.

When a call signal to be called to the mobile phone arrives, the signal is input to the digital data transmission / reception terminals DP, DM 65 and 66 of the connector unit 60 using the connection connector A 160, and then the general interface unit. 80 is applied. The universal interface unit 80 transmits a call signal to the CUI 20. The CPI 20 generates a mixer control signal through the universal interface 80, and the generated control signal closes the first analog switch 150 of the mixer 33. The mobile phone detects this by using an internal function circuit and transfers it to the call state.

The first analog switch 150 is closed by the mixer control signal during the mobile phone call. In this case, the call voice output is input to the speaker terminal 63 of the connector 60 by the first synthesizer 120. Through the speaker amplifier 35 is output through the user can check the contents of the call voice output. In this case, when the digital media player is continuously played, the output of the D / A converter 32 is combined with the voice output of the call by the first synthesizer 120, so that the user can reproduce the contents of the call and the digital media player. You will hear the composite of the signal.

In this case, the call history that the user intends to transmit through the microphone 40 is input to the microphone terminal 62 of the connector 60 through the third synthesizing unit 140, and then transferred to the call counterpart through the mobile phone. At this time, when the digital media player is continuously played, the playback signal of the digital media output from the D / A converter 32 is combined with the call history to be delivered by the third synthesizer 150 and then the other party. To be delivered to.

The call recording is performed after the voice signal of the user, which is output from the microphone 40, and the voice signal of the other party, which are input from the speaker terminal 63 of the connector 60, are synthesized by the second synthesizer 130. This is possible by being input to the conversion unit 32. The input call content is compressed by the DS processing unit and then stored in the memory unit 10.

5 is a diagram illustrating a connection structure of the connection connector A 160 connecting the external connection terminal 61 of the digital media player and the communication terminal UART of the mobile phone. Connector A is for mobile phone microphone (MIC) terminal, microphone (MIC) terminal of digital media player, mobile phone speaker (SPK) terminal, speaker (SPK) terminal for digital media player, mobile phone VDD power terminal and digital media player. Connect the Vcc power supply terminal of the mobile phone, the digital data transmission terminal (TXD) of the cellular phone and the DP terminal of the digital data terminal of the digital media player, and the DM terminal of the digital data terminal of the mobile phone digital data transmitter (RXD) and the digital media The ground power terminal, nRFR terminal and nCTS terminal of the mobile phone are connected to the ground power terminal of the digital media player. Terminal configuration connected to the mobile phone shown in Figure 5 may vary depending on the type of mobile phone. That is, the nRFR terminal and the nCTS terminal are special terminals used in a mobile phone terminal of "LG information communication" which is one of the electronics companies in Korea.

FIG. 6 is a diagram illustrating a connection structure of the connection connector B 170 connecting the external connection terminal 61 of the digital media player and the communication terminal (USB) of the computer. Connection connector B 170 is a computer VDD power terminal and a Vcc power terminal of a digital media player, a DP terminal of a computer digital data D + terminal and a digital data terminal of a digital media player, a computer digital data D- terminal and a digital media player. The DM power terminal and the ground power terminal of the computer are respectively connected to the ground power terminal of the digital media player, and in particular, the VDD power terminal of the computer is connected to the speaker (SPK) terminal of the digital media player. The voltage level applied to the speaker (SPK) terminal of the digital media player is different when connecting and when connecting a mobile phone.

FIG. 7 is an enlarged view of a port portion inserted into the external connection terminal 61 of the portable digital media player of the present invention among the configurations of the connection connector A 160 and the connection connector B 170, and centers the power supply voltage Vcc terminal. An analog signal terminal consisting of a microphone (MIC) and a speaker (SPK) is arranged at the upper portion thereof, and a digital signal terminal composed of the digital data DP and DM is disposed at the lower portion thereof, and a ground terminal is disposed outside thereof. It has a terminal configuration. As shown in FIG. 7, interference between the analog signal and the digital signal applied can be minimized by disposing a power supply terminal between the analog signal input terminal and the digital signal input terminal.

The equivalent circuit in the case where the power supply terminals are not disposed between the digital data terminal and the analog signal terminal but arranged next to each other can be represented as shown in FIG. 7B. In other words, it can be said that the analog signal terminal and the digital data terminal each form one pole plate of the capacitor. In the drawing, the analog signal terminal can be represented by the pole plate A, and the digital data terminal can be represented by the pole plate D. When A is a digital signal and D is an analog signal, the AC (AC) component of the digital signal affects D and conversely, the AC component of D affects A. In the latter case, since the voltage level of the digital signal is relatively small, it is less affected. However, in the former case, the analog signal is affected by the digital signal and causes unwanted noise.

Therefore, when the pin arrangement is formed as shown in FIG. 7A, it can be seen as an equivalent circuit as shown in FIG. 7C, where the AC component of the terminal D flows through the capacitor and flows to Vcc or the ground terminal. There is no impact, and vice versa.

Since the portable digital media player of the present invention can receive power from an external device, it is possible to provide a compact and lightweight portable digital media player that does not require a separate power supply device.

In addition, the portable digital media player of the present invention is provided with a connector for automatically detecting the connection between the computer communication port and the communication port of the mobile phone it is possible to be freely connected to the computer or mobile phone.

By using a wireless data communication device such as a mobile phone, the signal reproduced by the digital media playback device is provided by a synthesis unit capable of synthesizing the sound signal generated from the digital media playback device of the present invention with an audio signal input from an external device such as a mobile phone. There is an advantage that can be transmitted freely.

Since the interference between the analog signal and the digital signal input from the external device can be minimized by the digital media player having the connection terminal configuration proposed in the present invention, high-quality digital media can be reproduced.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary and should be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. . Therefore, the true scope of protection of the present invention should be defined by the technical spirit of the appended claims.

Claims (11)

delete delete delete delete delete delete In the portable digital media playback device that reproduces voice data and is portable, A communication terminal receiving the voice data from the external device, a power input terminal receiving power from the external device, and an analog input terminal receiving a first analog signal applied from the external device; One connector having; A memory unit for storing the voice data input through the connector; A signal processor for decoding the voice data stored in the memory unit and converting the voice data into the second analog signal; By setting a reference voltage of a predetermined magnitude, if the magnitude of the analog input signal is greater than the magnitude of the reference voltage, the signal is high. If the magnitude of the analog voltage is smaller than the magnitude of the reference voltage, the signal is divided into a low level. An interface unit which grasps a type of device and controls a transmission rate of the voice data transmitted from the external device to the memory unit according to the type of the external device; A mixer unit configured to mix and output the first analog signal input from the external device to a second analog signal switched and output by the signal processing unit according to the type of the external device determined by the interface unit; And And a power distribution unit connected to the power supply terminal for distributing power applied from the external device, so that power and digital data can be received from the external device. In the portable digital media playback device that reproduces voice data and is portable, A communication terminal receiving the voice data from the external device, a power input terminal receiving power from the external device, and an analog input terminal receiving a first analog signal applied from the external device; One connector having; A memory unit for storing the voice data input through the connector; A signal processor for decoding the voice data stored in the memory unit and converting the voice data into the second analog signal; By setting a reference voltage of a predetermined magnitude, if the magnitude of the analog input signal is greater than the magnitude of the reference voltage, the signal is high. If the magnitude of the analog voltage is smaller than the magnitude of the reference voltage, the signal is divided into a low level. An interface unit which grasps a type of device and controls a transmission rate of the voice data transmitted from the external device to the memory unit according to the type of the external device; A power distribution unit connected to the power supply terminal for distributing power applied from the external device; And And an output device for outputting the second analog signal, so that power and digital data can be applied from the external device. The method according to any one of claims 7 to 8, At least one of the plurality of power supply terminals is disposed at the center, and the plurality of analog signal transmission and reception terminals and the plurality of digital signal transmission and reception terminals are respectively disposed adjacent to each other with respect to the power supply terminal disposed in the center. A portable digital media playback device. The method of claim 9, And at least one of the remaining power input terminals other than the centrally arranged power input terminal is disposed outside the plurality of analog signal transmission / reception terminals and the plurality of digital signal transmission / reception terminals. The method of claim 9, And at least one terminal of the plurality of analog signal input terminals has a resistor connected to a ground portion at a front end of the analog signal input terminal.