KR20010026610A - Digital media device using wireless bidirectional transceiving system and having real-time monitoring function - Google Patents

Abstract

PURPOSE: A digital media device using a wireless bidirectional transceiving system is provided to use a transceiver having wireless transmitting/receiving functions, and to have a real-time monitoring function, so as to wirelessly transmit MP3 data and to simultaneously write the MP3 data in an MP3 player as listening to the data. CONSTITUTION: When MP3 data is read from a memory(70) on the basis of a micro computer(10), and when the MP3 data is spread in an MP3 decoder(20), the MP3 decoder(20) decodes the MP3 data and outputs digital music data. A D/A(Digital to Analog) converter(30) converts the digital music data into analog data. Analog information on the analog data is current-amplified in an amplifier(50) via an analog signal current amplifying buffer(40). The analog information is transmitted to a final speaker or a head. An analog signal passing through the buffer(40) is connected to a 'LINE OUT' terminal to be connected with other audio apparatuses.

Description

Wireless Bi-Directional Digital Media Device with Real-Time Monitoring {.}

The present invention relates to a playback device of MP3, that is, MPEG 1 Layer 3, which uses a transceiver having a wireless transmission and reception function to wirelessly transmit MP3 data while writing MP3 data to an MP3 player and simultaneously listening to the data. The present invention relates to a digital media device of a wireless two-way transmission / reception scheme having a time monitoring function.

As shown in FIG. 1, the system configuration of the existing MP3 player reads data from the memory 70 having MP3 data and sprinkles the data to the MP3 decoder 20 as shown in FIG. 1. The digital music data is output by decoding the digital music converter. The analog data is output through the digital analog converter 30 that analogizes the digital data. The small signal analog information is sufficiently amplified by the amplifier 50 and then transferred to the final speaker. It is configured to be.

Here, MP3 data is mainly supplied from personal computer. MP3 data is supplied using print port or USB (Universal Serial Bus). In this case, some signal conversion is required between microcomputer (10) and personal computer. Performing this is the print interface 105.

In this case, a print cable or a USB-only cable is required. Therefore, a connection operation between a computer and an MP3 player is required when sending or receiving MP3 data. Moreover, all existing MP3 player devices write MP3 data to the device. At the time of writing, the recorded data cannot be confirmed or heard at all.

Therefore, there is considerable inconvenience such as the inability to check the sound quality or sound pressure level of the music being recorded, and the recording has to be cumbersome to install a cable every time between the computer and the MP player.

The present invention is characterized by the real-time monitoring function at the time of recording so as to eliminate the inconvenience caused by the installation of the cable during the recording of these two problems, and at the same time to check the recording status.

Recently, the MP3 player has developed a lot according to the rapid market demands. The present invention has solved the complicated installation problem due to the cable connection during recording, which has been the biggest problem in the portable and stationary MP3 players. Just as there is a line monitoring function when recording on a general audio device, the MP3 device implements such a function.

The present invention is a system configuration for reading and playing digital media data from any storage device in a device for playing and storing MPEG information.

Between the arbitrary storage device and the device for reproducing and storing the MPEG signal has a serial-to-parallel conversion device for a serial data transmission and reception structure, and a transmission and reception module for transmitting and receiving data, the serial-to-parallel conversion device and the The receiving module is provided in each of the above-described arbitrary storage devices and devices for reproducing and storing MPEG signals, and the transmission and reception method is achieved by adopting a digital modulation method.

1 is a system configuration diagram of an existing MP3 player

2 is a system configuration diagram of the present invention

3 is a flowchart in a download-only mode of the present invention.

4 is a block diagram of a wireless receiver of the present invention

5 is a block diagram of a wireless transmitter of the present invention

6 is a wireless data and modulation scheme of the present invention

7 is a sensitivity characteristic diagram of the infrared communication transmitter and receiver of the present invention.

8 is a signal processing format diagram for MP3 real-time monitoring of the present invention

[Explanation of symbols on the main parts of the drawings]

10: Micom 20: MP3 Decoder

30: Digital Analog Converter 40: Buffer

50: amplifier 60: key matrix

70: memory 80: LCD

90: LCD controller

100,130,210,220: IR signal and serial / parallel signal interface

110,120: Infrared transceiver module

140: PC or data storage device

2 is a system configuration diagram of the present invention;

The MP3 decoder 20 decodes the data and outputs digital music data by reading the data from the memory 70 having the MP3 data around the microcomputer 10 and sprinkling the data onto the MP3 decoder 20. The analog data is output through the digital analog converter 30 that converts the analog signal, and the small signal analog information is sufficiently amplified by the amplifier 50 through the analog signal current amplification buffer 40 to the final speaker or headphones. Configured to be delivered.

In addition, the analog signal passing through the buffer 40 is also connected to the LINE OUT terminal for connection with other audio equipment.

Here, the key matrix 60 is provided with switches that are in charge of various controls of the device, and the main functions thereof are PLAY, STOP, FF, BACK DOWNLOAD, PLAT MODE (one song, continuous ..), volume up / down, The power is based on the control port of the microcomputer 10 and the program in the microcomputer 10.

In addition, in order to indicate various operating states of the MP3 player, such as the operation state of the device, the title of the music, the song content, the play mode, the volume state, etc., the LCD controller 90 receives the state data of the device from the microcomputer 10 and displays the LCD ( 80).

In the DOWNLOAD mode, the IR & S / P INTERFACE (100, 130) and the infrared transmitting / receiving modules (110, 120) work together to transfer the PC or data storage device (140) and MP3 data. Configured to perform write or read operations.

Referring to the operation of the microcomputer 10 of the present invention in the form of a flowchart, as shown in FIG. 3, the microcomputer 10 initializes all ports, decodes, key matrices, and other external interfaces. In other words, reset is performed.

Next, the microcomputer 10 enters a state waiting for a command and performs a download routine in the downloading mode by key checking whether the download mode is in the downloading mode or not. When the key input is PLAY and the MP3 player starts playing, the MP3 player starts to play the MP3 music. When the BACK or FF song selection key is entered, the MP3 player moves back and forth from the stored song. In this mode, the user can switch to another song during playback, depending on whether the input key is BACK or FF.

Although not shown in the flowchart, it is possible to perform various other functions such as a song playback mode, that is, one song repeat mode or a stored song sequence playback mode.

The above flowchart description is for the download only mode.

Figure 2 is a block diagram of a wireless receiving module of the present invention, a combination of the main configuration of the receiving unit of the infrared wireless transmitting and receiving unit 110 and the aforementioned infrared communication and serial-to-parallel conversion interface (IR & S / P INTERFACE) in detail It is for explanation.

That is, a photodiode 150 for receiving an infrared signal in the 900 nm to 1000 nm band, an amplifier 160 for amplifying the received signal, and a bandpass filter for deriving only some necessary components in the 900 nm to 1000 nm band among the amplified signal components ( 170) and then the demodulated or detected signal through the envelope detector 180 for demodulating the original signal from the modulated signal passes through the hysteresis comparator 190 and then through the inversion switching transistor Q1 and then again. Through the electricity 200, the above-described infrared communication and serial-to-parallel conversion interface (IR & S / P INTERFACE) 210 through the serial data signal is converted in parallel and transferred to the final microcomputer 10.

According to the method of the microcomputer 10, the serial data may be directly input to the microcomputer 10 without using the above-described serial-to-parallel conversion interface 210.

The reason why the envelope detector 180 is used is that the modulation is selected according to the ASK (Amplitude Shift Keying) method, that is, whether the data state is 1 or 0, as shown in FIG. Because.

In other words, when the data is 1, it is developed as hundreds of KHz, and when the data is 0, the oscillation is maintained at 0 without any oscillation. Therefore, the envelope detector 180, which is used for demodulation of the amplitude modulated signal which is frequently used in general communication, is used. Write simply takes data.

4 is a system configuration diagram of a wireless transmitter of the present invention, which combines the main configuration of the transmitter of the infrared wireless transmitter / receiver 110 and the above-described infrared communication and serial / parallel conversion interface (IR & S / P INTERFACE). To do that.

The data input in parallel from the microcomputer 10 is converted to serial data format in the infrared communication and parallel conversion interface 220, and then the data and the oscillator 240 are modulated in the AND gate 230, so that the data of FIG. As shown in FIG. 260, ASK modulation is applied to the base of the transistor Q2 for driving the infrared LEDs IR1 and IR2 to excite the infrared LEDs IR1 and IR2 configured in series to transmit infrared signals.

The wavelength band of this outgoing infrared signal is an infrared signal of 900 nm-1000 nm.

4 and 5 are the same as the operation structure of the infrared ray transmitting and receiving module 120 and the IR & S / P INTERFACE 130 mentioned in the description of FIG. 2. Do.

In other words, IR & S / P INTERFACE (100 & 130) and infrared transmission / reception module of symmetrical structure between MICOM 10 and PC or data storage device 140 to enable infrared communication. (110, 120) is present.

FIG. 6 shows a radio data and modulation structure of the present invention and shows an ASK (Amplitude Shift Keying) method.

The ASK communication method is analogous to amplitude modulation in analog communication. When ASK modulation is performed on the original data 250, the modulated output oscillates when the data is 1 and stops when the data is 0. It shows such a form.

That is, the ASK-modulated signal is transmitted to the infrared component (900 nm to 1000 nm) wavelength by the infrared LED (IR1) (IR2) to move the space, and the photodiode 150 receives the signal to envelope decode the signal. If the original data 250 is in the form.

FIG. 7 shows the light intensity 270 of the infrared light emitting diode and the reception sensitivity 280 of the photodiode, both of which have a large value in the wavelength range of 900 nm to 1000 m.

This indicates that the infrared transmitter and the infrared receiver have the same characteristic gains in the same wavelength band, so that transmission and reception are performed properly.

In addition to the above-described wavelength band, the infrared light emitting diode and the photodiode can be designed by changing the applied wavelength band as much as the configuration and configuration in any wavelength band.

8 is for explaining a signal processing scheme for MP3 real-time hearing of the present invention.

The MP3 decoder 20 of FIG. 2 is an MP3 via an infrared communication and serial-to-parallel interface (IR & S / P INTERFACE) (100,130) and infrared transmission / reception module (110, 120) from a PC or data storage device 140. The MP3 decoder 20 receives the data and converts the MP3 data into an analog audio signal. The time when the MP3 decoder 20 receives the MP3 data from the PC or the data storage device 140 is t1, that is, DECODER DATA REQUEST TIME of FIG. 8.

The data received in the form of a packet is decoded as much as the amount of MP3, and the decoding result signal is restored and reproduced as an analog signal through the buffer 40 or the amplifier 50 of the next stage.

In the system operation structure of the decoder, after the DECODER DATA REQUEST TIME, there is an interval time t2 of several ms. During this t2 time, the microcomputer 10 writes the MP3 data to the memory 70.

Then, the second MP3 packet data for playback is received for the period t3 as described above, followed by the audio playback of the MP3 data received for the period t1, and then the MP3 data received for the period t2 is returned to the memory 70. Light it up.

Thus, during t1, t3, t5, ..., MP3 data is received from the external PC or storage device through the external interface and played back first, and t2, t4, t6. The WRITING operation on the configured memory on the MP3 player side allows the actual playback and recording operations to be performed simultaneously. This means that real-time monitoring downloads are possible.

Therefore, MP3 recording time is almost the same as the actual song playback time.

However, although the writing speed may be different in the download-only mode generally applied to date, as shown in the operation flowchart of FIG. 3, two modes of the download-only mode and the real-time hearing mode described above are selected in the download mode. You can do it with

The above-mentioned wireless data transmission and reception method will be a method using an infrared signal, but recently, wireless transmission / reception using RF (RADIO FREQUENCY) within the RF allowable frequency range of 400 MHz or 900 MHz is possible at a short distance. Transceiving a transceiver in each of the RF modules 110 and 120 can be easily converted to an RF wireless data transmission method.

In the case of the infrared communication method is possible in the short-range, it is difficult to apply in the long distance and there is a problem that the wireless data is broken if there is an obstacle on the data transmission and reception path.

However, compared to RF method, there is no crosstalk, and it has strong characteristics against external noise and electromagnetic wave.In the case of RF method, distance limitation is less than that of infrared method and it is strong against obstacles, but weakness such as noise or interference is weak. .

In addition, since the infrared communication method is a situation that a notebook has almost adopted a standard infrared communication protocol called IRDA in recent years, the infrared communication method of the present invention is also complied with this, it can be seen that its application and application range is very wide.

The present invention can solve various inconveniences caused by the wired download function adopted by the conventional MP3 player, that is, cable connection, unnecessary accessory addition, and cost increase. When you write MP3 data to a playback device, you can not only execute the download but also implement real-time monitoring technology that allows you to record while listening to the sound of music recorded like a normal audio device. It can be applied to various applications such as mobile, portable and industrial.

Claims (4)

In a system configuration for reading and playing digital media data from any storage device in a device for playing and storing MPEG information, A serial-to-parallel converter for serial data transmission / reception structure between the arbitrary storage device and the device for reproducing and storing the MPEG signal; It has a transmission and reception module for transmitting and receiving data, and the serial-to-parallel converter and the transmission and reception module are installed in each of the arbitrary storage device and the device for reproducing and storing the MPEG signal, A digital media apparatus of a wireless two-way transmission / reception scheme, wherein the transmission / reception scheme employs a digital modulation scheme. The digital media apparatus of claim 1, wherein the digital modulation scheme employs an ASK (Amplitude Shift Keying) scheme. On devices that play and store MPEG information, In order to realize simultaneous playback and storage, WRITING is performed on the storage device by writing the digital packet information inputted to the storage device for several milliseconds after the read time of the digital packet information required to reproduce the MPEG signal from an arbitrary storage device. The digital media device having a real-time monitoring function, characterized in that for repeating the READ operation of reading the packet information and the WRITING operation of the digital packet information input to the storage device sequentially. The digital media device having a real-time monitoring function according to claim 3, wherein the MPEG information can be divided into a structure that doubles playback and storage from any storage device and a download-only mode for increasing the download speed.