KR20050007018A - Portable digital data exchanging system by using infrared device - Google Patents

Abstract

PURPOSE: A mobile digital data exchanger using an infrared device is provided to increase a transmission/reception success rate by providing a high error correction(Reed Solomon) function and accomplish a small type and low power consumption by implementing every component in one chip. CONSTITUTION: An input through an electrostatic capacitance change sensing units(touch pad, sensor)(100,101) is applied to an A/D converter(102) and digitalized. A CPU(103) determines that and performs a suitable command. A RAM(105) has an SRAM structure. A ROM(106) has a mask ROM structure and is programmed before it comes onto the market so that a user can download an application program from a PC through a USB(108) and stores it in a FLASH ROM connected to a FLASH ROM I/F(109). D1 and R2 of an equivalent circuit(capacitance change sensor)(112) of the touch pad and the sensor(100,101) are used to prevent an overshoot, static electricity and latch-up. A CRC(104) inserts an error correction code into transmission data and drives an infrared light emitting/light receiving unit(111) through an Enc/Dec(Encoder/Decoder)(107). A signal from the infrared light emitting/light receiving unit(111) is received through the Enc/Dec(107), demodulated through the CRC(104), and then, displayed on a display unit(110). A signal which has passed the R2 is inputted to the A/D converter(102) to check whether a key has been inputted or not.

Description

Portable digital data exchanging system by using infrared device

The present invention relates to an apparatus and protocol for short-range transmission and reception of digital data between homogeneous devices using infrared light.

Digital data exchange between similar devices such as the electronic business card invented so far is assembled at the manufacturing stage by using a plurality of keys, that is, a power ON / OFF key, a menu key, an UP / DOWN key, and a LEFT / RIGHT key using only a contact type or a rotary switch. This is difficult and can cause failure due to wear in use. Also, it does not have error correction function when receiving data, and the probability of one-time transmission and reception is low only by error detection by CHECKSUM method. In addition, it uses a low-speed method such as UART to upload / download programs or data by connecting to a PC, which is boring for the user. In order to send and receive business card contents with the counterpart in electronic business cards, a dedicated semiconductor chip is required to quickly synchronize devices, correct real-time errors, and process large amounts of data. In the present invention, in order to compensate for the above disadvantages, a capacitive change (voltage fluctuation) by a human hand is detected in addition to a contact key, and a command is received. It has a unique structure of sending and receiving ACK signal for data start, error correction and normal status by sync. In addition, the user can feel convenient because the automatic mode is used to transmit and receive in a continuous process. In the idle mode, the user starts a moment of operation when a user touches a hand on a sensing unit or a touch pad of the device to enable fast driving. Most of the functions are integrated in one chip, and the external passive device has a relatively small configuration. With the above configuration, the core of the present invention is made compact, low power, high speed and high transmission and reception success rate.

The present invention displays a plurality of AD converters for recognizing touch keys, Reed-solomon encoding / decoding for real-time error correction, and compressed image data to achieve miniaturization, low power, high speed, and the highest transmission and reception success rate. In order to have high speed communication with JPEG decoder, PC interface, USB interface, FLASH ROM interface, LCD interface, system control CPU (or MCU) and infrared transmit / receive ENC / DEC should be built in one chip. In addition, multi-stage power saving methods and corresponding operating protocols are required to prolong power life, and the device must be able to operate with a minimum passive element that can be assembled in a compact and thin case.

1 is a block diagram of a portable digital data exchange device of the present invention;

2 is an automatic mode digital data exchange flowchart;

3 is a manual mode digital data exchange flowchart;

4 shows a transmission and reception bit stream configuration;

5 is a finished product drawing

The present invention relates to an apparatus and protocol for short-range transmission and reception of digital data such as video images, music MIDI, learning, business card information, and everyday life information between similar devices using an infrared Tx / Rx device. ,

At the time of manufacture, the USB booting program is written in the boot ROM 106 so that the user can download the system program from the PC via the USB 108 and download his / her own data (business card contents, various files) to be transmitted. do. When the device is normally in the dormant state, when a human hand contacts the sensing unit 101 or the touch pad 100, the device wakes up from the dormant state, that is, the IDLE mode 211, and enters the initial screen 201 state. . In the automatic mode, the CPU 103 receives consecutive 1 and 0 bits (Preamble) for a certain period of time to check the readiness of the counterpart device, and transmits it to the opposite party to inform the counterpart. Depending on which ACK signal is sent first, the master / slave rank is determined. In the manual mode other than the automatic mode, a desired operation is performed by scrolling a menu displayed on the display device 110 with a contact key or touch pad 100. The signal passing through R2 of 112 is inputted to the A / D converter to check the presence of a key in the logic circuit for checking. When the signal is detected, the CPU is awakened from the dormant state to perform a task in command standby or automatic mode. It enters the routine. A preamble signal means a continuous 1 and 0 pattern. The reception mode is long and the transmission mode is shortened to save power. In the automatic transmission / reception mode, after the master and slave ranks are determined, the slave detects the sync signal sent from the master, receives the header information and data, and goes through error correction process. Restore using a decoder. When the reception is normally completed, the display is displayed on the display device 110, and vice versa transmits sync and data to the master. At this time, since they are synchronized with each other, there is no need to transmit / receive preamble signals.

1 is related to the overall hardware system configuration, and the input through the capacitance change detection unit 100 and 101 is applied to the internal chip A / D converter 102 and digitized. The CPU 103 determines this and performs a command corresponding thereto. The RAM 105 has an SRAM structure as the DATA memory of the CPU. The ROM 106 has a mask ROM structure, and is programmed at the time of initial shipment, so that a USER can download an application program from a PC through the USB 108 and store it in a FLASH ROM connected to the FLASH ROM I / F 109. . In the equivalent circuit 112 of the touchpad and the sensing unit, D1 and R2 are used to prevent overshoot, static electricity and latch-up. The CRC 104 inserts an error correction code into the transmission data to drive the infrared light emitting / receiving member 111 through the ENC / DEC 107. In addition, the signal through 111 is received through ENC / DEC 107 and demodulated via CRC 104, and then data is displayed on display 110. FIG. The signal passing through R2 of 112 is input to the A / D converter to check the presence of a key.

Fig. 2 is a flowchart showing the execution procedure in the case of automatically transmitting and receiving among the functions of the digital data exchange apparatus. When the device is taken out, the detection unit 200 checks the capacity change and wakes up the device (201). After the CPU starts the operation and displays the initial screen, the CPU attempts to receive the preamble 203 signal and vice versa in order to synchronize with the operation of the counterpart device. If the A (one device) side receives the preamble received from the B (the other device) side before the other party, the A side becomes the master when the ACK 205 is transmitted and the ACK is received. The B-side device sends a sync signal indicating the start time of the data, and detects the data (206) and starts receiving the data (207). At this time, the reed-solomon method 208 is used to correct an error occurring during transmission. If the error correction range is exceeded, the NG is transmitted and then goes back to the sync detection mode 206. If the error is corrected normally, the content is displayed on the screen and the process proceeds to sending the necessary data to the other party. You can also skip to the Sync send step and go directly to the data transmission mode. After a certain period of time, and after a certain period of time to enter the power saving mode IDLE state 211 and check only the state of the detection unit.

3 is a flowchart in the case of transmitting or receiving in the manual mode. In step 300 to 310, data is transmitted, and a preamble signal 304 is transmitted and a response ACK 306 is received so that an external device can receive the command 303 by a touch key and prepare the external device. When it is started, the synchronization signal sync 307 and the data 308 indicating the start are transmitted. When the reception result is returned from the external device, if NG is returned to 307, and if OK, it returns to the initial screen 302 and ends the operation. In step 311 to step 322, data is received, and a preamble 315 is received for a predetermined period of time in order to check whether there is outgoing data from the receiving device by receiving a receiving command 314 by a touch key. When the preamble is detected, a response ACK 317 is transmitted, a synchronization signal sync 318 indicating the data start of the other party is detected, and data 319 is subsequently received. Through the error correction step 320, the received data determines whether there is an abnormality. If NG, the result is notified to the counterpart and the sync is detected again. If there is no error, go to the initial screen 313 and if there is no command for a certain time, the power saving standby in the IDLE mode (322).

4 shows a bit stream configuration, where preambles 400 and 410 are repeated 1s and 0s, and the transmission cycle is shorter than the reception cycle to save power. In addition, the preamble signal has no error correction bits to reduce power consumption. The ACK signal is 1 byte and it is better to change the transmit and receive code values to improve reliability. Reference numerals 400 to 408 denote bit streams for data transmission, and points 410 to 418 denote bit stream structures for data reception.

Figure 5 shows the shape of the mounted set, the USB connector 502 is for connecting to a device such as a PC used to upload / downloa PC or data or programs at high speed or to charge the built-in rechargeable battery do. The detection unit may be any place such as front or back or side, but it should be manufactured in case of contact with the conductive material in the pocket or storage area. One or more touch pads 504 are used separately from the contact type when the contact type is not required in the function so that the touch pad 504 is recessed inward from the surface.

As described above, according to the present invention, it is possible to perform short-range wireless communication using infrared rays for necessary data in the manual mode when exchanging data, and to automatically perform transmission and reception successively in an automatic mode for access cards and electronic business cards. do. Because of its powerful error correction function, the transmission and reception success rate is high, and all the parts can be implemented on one chip, so it can be designed to be small and low power type. In particular, since the transmission and reception protocol used is a power saving method, it is ideal for long-term use as a small battery.

Claims (7)

Infrared transmitter / receiver uses a device for transmitting and receiving digitized data such as video images, MIDI for music, learning, business card information, and daily life information at a short distance. CPU, RAM, ROM unit, USB I / F unit for connecting to an external device, external flash ROM I / F unit for storing programs and data, CRC unit for error correction of received data, infrared light emitting device In a portable digital data exchange device and a transmit / receive protocol comprising an encoder / decoder section of a digital display, a menu and a display device for displaying received contents, In the sleep state of the device in addition to the contact button, the change of the capacitance by the human hand to initiate the operation of the system through the sensing unit 503 or the touch pad 504 and enters the command standby mode. The method of claim 1, A portable digital data exchange device that receives an operation command by detecting a change in correction capacitance by a 112 and an A / D converter 102 by using a touch pad as well as a contact type or a rotary switch among command input keys. The method of claim 1, In addition to the error extraction by the CHUCKSUM value of the data received from the CRC unit 104, in order to increase the probability of transmission and reception, the digital data exchange has a configuration that can be used to evict and correct the error by embedding an error correction function such as a reed-solomon method. Device. The method of claim 1, In case of transmitting / receiving the contents of the electronic card, it is possible to send or receive data in the manual mode, and in the automatic mode, when the human hand touches the touch pad 504, the digital data exchange to send and receive the data in continuous operation. Device. The method of claim 1, Digital data exchange device that goes through (300) ~ (310) process in the manual mode, (311) ~ (322) process when receiving in the manual mode, and (200) ~ (211) process when transmitting and receiving in the automatic mode. The method according to claim 1 and 5, A digital data exchange apparatus having a transmission protocol that goes through (400) to (408) and a reception protocol that goes through (410) to (418) in data transmission. The method according to claim 1, 5, 6, Digital data exchange device that decides master and slave by minimizing power usage by using preamble transmission / reception method like (419) and checking relative status of homogeneous period.