KR100767414B1 - Wireless video transmission and receipt apparatus using a human body - Google Patents

Abstract

A wireless image transmitting/receiving apparatus using the human body is provided to reduce the size of elements or a battery by reducing power consumption during transmission of image signals at a high speed without encoding or decoding them for the purpose of reducing the transmission speed. A transmission frame buffer(22) temporarily stores digital image data outputted from an image reproducing device. A serial digital image interface transmitter(24) converts the digital image data into serial digital data in units of packets including timing information of a clock of the digital data. A transmission circuit(26) amplifies the serial digital data. A transmission electrode(28) contacts with a human body to output the amplified serial digital data to the human body. A reception electrode(38) contacts with the human body to receive the serial digital data which has been converted into a pulse signal through the human body that performs a band pass filter function. A reception circuit(36) restores the pulse signal into the serial digital data. A serial digital image interface receiver(34) restores the restored serial digital data into the clock and the digital image data. A reception frame buffer(32) temporarily stores the restored clock and the digital image data and then outputs them to a screen display unit(40).

Description

Wireless video transmission and receipt apparatus using a human body}

1 is a block diagram illustrating a wireless video transmitting and receiving device according to the present invention;

2 is a waveform diagram for explaining a change in signal waveform in FIG. 1;

3 is a view for explaining a wrist watch type video playback device in which the video playback device 10 and the transmission unit 20 are integrated as an example of a transmission device according to the present invention;

4 is a view for explaining a spectacle-type screen display device in which the screen display device 40 and the receiver 30 are integrated as an example of the reception device according to the present invention;

5 is a view for explaining an example of use of the wireless video transmitting and receiving device of FIG.

<Description of reference numbers for the main parts of the drawings>

10: video playback device 11: watch body

20: transmitter 22: transmission frame buffer

24: serial digital video interface transmitter

26: transmitting circuit 28: transmitting electrode

30: receiving unit 32: receiving frame buffer

34: serial digital video interface receiver

36: receiving circuit 38: receiving electrode

40: display device 50: human body

The present invention relates to a wireless video transmission and reception apparatus, and more particularly, to a wireless video transmission and reception apparatus using a human body.

A general way of viewing images played on a portable image reproducing apparatus is through a small LCD screen included therein. In this case, since the image reproducing apparatus and the screen display apparatus are integrated, it is widely used because it is possible to display high quality images with low cost and no noise. However, there are disadvantages in that the display devices are duplicated when carrying various devices, the screen is inconvenient due to the small screen, and the portable video player must be held by hand in order to view the screen.

In order to solve this drawback, a method of transmitting the image data reproduced by the image reproducing apparatus to the display device using a wire has been used. This wired method has the advantage of being able to transmit a high quality image signal without interference of external noise while being low power at a low price. Representative examples of the wired method include the NTSC method and the RGB method as analog methods, and the DVI and HDMI methods as digital methods. However, the wired method is inconvenient to restrict the user's movement because the connection line is too rough to be used in the human body area, and it is inconvenient to connect the image reproducing device and the screen display device every time.

In order to solve the inconvenience of the wired method, a method using RF has been recently considered, but such an RF method has limitations due to low transmission speed, inter-device interference due to over-the-air use, and high power consumption due to the use of RF input / output terminals. Have.

Therefore, the technical problem to be achieved by the present invention, by transmitting the image information reproduced in the portable video playback device to the screen display device via the human body without the use of wires or antennas, the inconvenience of using the wire system is a disadvantage, The present invention provides a wireless video transmitting / receiving apparatus using a human body that can solve a problem of high power consumption, low transmission speed, and interference with external noise.

In accordance with another aspect of the present invention, there is provided a wireless video transmitting / receiving apparatus including a transmission frame buffer for temporarily storing digital image data output from an image reproducing apparatus, and timing of clocks of digital image data stored in the transmission frame buffer. A serial digital video interface transmitter for converting the information into packet-based serial digital data, a transmission circuit for amplifying the serial digital data converted from the serial digital video interface transmitter, and a serial digital signal amplified by the transmission circuit. A transmitter including a transmission electrode in contact with the human body to output data to the human body; And

The serial digital data is output to the serial digital data from the transmitting electrode and contacts the human body to receive the converted pulse signal through the human body that functions as a band pass filter. A reception circuit for restoring the digital signal; and a serial digital video interface receiver for restoring the serial digital data restored in the reception circuit into a clock and digital image data; and temporarily storing the clock and digital video data restored in the serial digital video interface receiver. And a receiving unit including a receiving frame buffer for outputting the same to the screen display device.

The image reproducing apparatus may be a wristwatch-type image reproducing apparatus which can be worn on a wrist since the body has a watch band. In this case, the transmitting electrode is preferably attached to the back of the clock body.

The screen display device may be a glasses-type screen display device that can be worn on the eyes because the legs are attached like glasses, in which case the receiving electrode is preferably installed on the glasses legs.

The serial digital video interface transmitter may serialize video data by constructing a packet in units of lines of video.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail. The following examples are only presented to understand the content of the present invention, and those skilled in the art will be capable of many modifications within the technical spirit of the present invention. Therefore, the scope of the present invention should not be construed as limited to these embodiments.

1 is a block diagram illustrating a wireless video transmitting and receiving apparatus according to the present invention, and FIG. 2 is a waveform diagram illustrating a change in a signal waveform in FIG. 1.

Referring to FIG. 1, the present invention is largely divided into a transmitter 20 and a receiver 30. The transmitter 20 receives a digital video signal from the image reproducing apparatus 10 and transmits it to the human body 50. The receiver 30 receives a signal from the human body 50 and outputs it to the screen display device 40.

The transmitter 20 is composed of a transmission frame buffer 22, a serial digital video interface transmitter 24, a transmission circuit 26, and a transmission electrode 28.

The transmission frame buffer 22 temporarily stores digital image data output from the image reproducing apparatus 10 and outputs the digital image data to the serial digital image interface transmitter 24. Then, the serial digital video interface transmitter 24 converts the packet into serial digital data in a packet unit in which timing information of a clock is embedded by constructing a packet in line units of the video and serializing the image data. The transmitting circuit 26 amplifies and outputs the serial digital data by inducing an electric field. The output signal of the transmission circuit 26 is transmitted to the human body 50 through the transmission electrode 28 attached to the human body 50.

The receiving unit 30 includes a receiving electrode 38, a receiving circuit 36, a serial digital video interface receiver 34, and a receiving frame buffer 32. The signal passing through the human body 50 is detected by the receiving electrode 38.

The human body 50 has a component similar to physiological saline of 0.9% sodium chloride and has a slight conductivity depending on frequency, so that an electrical signal can be transmitted and has a loss of about 5 to 10 dB due to a resistance component. Also, as shown in FIG. 2, a band pass filter (50a, hereinafter referred to as a 100 MHz band pass filter) that passes a frequency between 2 MHz and 100 MHz.

Since the GNDs of the transmitter 20 and the receiver 30 are separated from each other, low-frequency signals of less than 2 MHz including the DC signal are not transmitted well through the human body 50. In the band between 2MHz and 100MHz, the signal passes through the air due to weak capacitive coupling and other complex actions. For frequencies above 100MHz, the signal cannot pass due to the characteristics of the human body itself. For this reason, the human body 50 functions as a 100 MHz bandpass filter.

Therefore, when the serial digital data 28a (square wave) is output through the transmitting electrode 28 and passes through the human body 50, the receiving electrode 38 has no DC offset and has a width of 5 to 10 ns in positive and negative magnitudes. Sensed by signal 38a.

The receiving circuit 36 amplifies the pulse signal 38a and then detects the pulses using a hysterisis comparator 36a to restore the original serial digital data 28a and output them. Then, the serial digital video interface receiver 34 restores the serial digital data 28a restored in the reception circuit 36 to clock and digital image data. The reception frame buffer 32 temporarily stores the clock and the digital image data restored by the serial digital image interface receiver 34 and outputs them to the display device 40.

As described above, a very weak electric signal detected by the receiving electrode 38 through the human body 50 is sufficiently amplified by the receiving circuit 36 having an input impedance of 50 ohms, and then restored to a digital signal through triggering. Therefore, the wireless video transceiver according to the present invention has the advantage of low power and miniaturization since it can transmit the image data at high speed without additional encoding or decoding work to reduce the transmission speed.

3 is a view illustrating a wrist watch type video playback device in which the video playback device 10 and the transmission unit 20 are integrated as an example of the transmission device according to the present invention. The transmitting electrode 28 is installed on the back of the watch body 11, and the image reproducing apparatus 10 is embedded in the body 11. The flash memory card 12 is installed so that the flash memory card 12 can be inserted into an appropriate place of the body 11.

4 is a view illustrating an eyeglass-type screen display device in which the screen display device 40 and the receiver 30 are integrated as an example of the reception device according to the present invention. The receiving electrode 38 is installed on the leg of the glasses so as to touch the side of the face when a person wears it. The screen display device 40 becomes a part where the eyeglasses are located. The display device may be an LCD or a HUD.

5 is a view for explaining an example of use of the wireless video transmitting and receiving device of FIG. As shown in FIG. 5, even if there is only one transmitting device, image data may be displayed by the plurality of receiving devices 40 through the human body.

As described above, according to the present invention, it is inconvenient to transmit an image signal at high speed through the human body and to receive and view the image signal transmitted through the human body using only one signal electrode without using a conductor or an antenna. This eliminates the need for the use of an antenna, providing convenience in use and eliminating the need for an antenna having difficulty in size or mounting. In addition, since there is no need for additional encoding or decoding to reduce the transmission speed, power consumption can be reduced while performing high-speed transmission, thereby reducing the size of the components and the size of the battery, and having the advantage of miniaturization. In addition, since the video signal is transmitted through the human body rather than air, there is less external noise interference, thereby reducing the transmission error, and thus there is an advantage in that a high quality video can be enjoyed.

Claims (5)

A transmission frame buffer for temporarily storing digital image data output from the image reproducing apparatus, and a serial digital image interface for converting the digital image data stored in the transmission frame buffer into serial digital data in packet units incorporating clock timing information. A transmitter including a transmitter, a transmission circuit for amplifying serial digital data converted by the serial digital video interface transmitter, and a transmission electrode contacting the human body to output serial digital data amplified by the transmission circuit to a human body; And The serial digital data is output to the serial digital data from the transmitting electrode and contacts the human body to receive the converted pulse signal through the human body that functions as a band pass filter. A reception circuit for restoring the digital signal; and a serial digital video interface receiver for restoring the serial digital data restored in the reception circuit into a clock and digital image data; and temporarily storing the clock and digital video data restored in the serial digital video interface receiver. And a receiving unit including a receiving frame buffer for outputting the same to a screen display device. The apparatus of claim 1, wherein the image reproducing apparatus is a watch type image reproducing apparatus which has a watch band on the body and can be worn on a wrist, and wherein the transmitting electrode is attached to a rear surface of the watch body. Video transceiver. The apparatus of claim 1, wherein the screen display device is a spectacle type screen display device that can be worn on the eyes by having legs like glasses, and the receiving electrode is installed on the glasses legs. The apparatus of claim 1, wherein the serial digital video interface transmitter serializes image data by constructing a packet in units of lines of an image. The apparatus of claim 1, wherein the pulse signal received by the receiving electrode is a pulse signal having a width of 5 to 10 ns in a positive and negative magnitude without a DC offset.

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