KR970002342Y1 - Video and audio transmitting apparatus for video recording system - Google Patents

Abstract

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Description

Video and audio transmission device for video recording and playback system

1 is a schematic diagram of a conventional video and audio transmission device applied to a camcorder.

2 is a block diagram of a video and audio transmission device for a video recording and reproducing system according to an embodiment of the present invention.

3 is a cross-sectional view of a camcorder to which a video and audio transmission device according to an embodiment of the present invention is applied.

＊ Explanation of symbols on main parts of drawing

25: image processing circuit 26: audio processing circuit

28-32: 1st-3 FM modulator 34-38: 1st-3 drive part

40 to 44: first to third infrared light emitting elements 46 to 50: infrared light receiving elements

52 to 56: first to third FM demodulator 58, 62: first and second connection ports

60: monitor

The present invention relates to a video and audio transmission device for transmitting a video signal and an audio signal generated in a video recording and reproducing system or an integrated video recording and reproducing system to a display device. It is ideal for video and audio transmission devices that can be transmitted wirelessly.

A typical video recording and reproducing system is a system for reproducing video and audio signals recorded on a recording medium, and recording video and audio signals on a recording medium, such as a video cassette recorder (hereinafter referred to as a VCR). An image recording and reproducing system incorporating a camera is a system having a function of capturing an image of a subject and encoding the image of a subject into a video signal in addition to a recording and reproducing function of a video and an audio signal, such as a camcorder. The VCR and camcorder have a video and audio transmission device for transmitting the reproduced video and audio signals to a television, which is a display device, for displaying the reproduced video and audio signals. To this end, the conventional video and audio transmission apparatus has a frequency multiplexing circuit and a frequency converter for multiplexing and converting the reproduced video and audio signals and transmitting the converted video and audio signals in the form of high frequency signals to the television receiver through the air. Or a transmission cable for transmitting the reproduced video and audio signals to the television as it is, and connecting ports for connecting the transmission cable to a television and an image recording and reproducing apparatus. A video and audio transmission apparatus for frequency-multiplexing and converting the reproduced video and audio signals in the form of high frequency signals and transmitting them through the air is disclosed in US Patent Publication No. 5,045,948, published on September 31, 1991. The video and audio transmission device disclosed in Japanese Patent Publication No. 5,045,945 multiplexes and converts video and audio signals reproduced by a VCR into high frequency signals having a frequency band of 902 to 928 MHz, and transmits the multiplexed and converted high frequency signals through the air. . However, the conventional video and audio transmission apparatus disclosed in U.S. Patent No. 5,045,948 transfers to a remote transmission of reproduced video and audio signals, while transmitting the reproduced video and audio signals in the form of high frequency signals through the air. In order to receive the transmission frequency band in order to have a problem that hamper the effective use of the radio transmission frequency of the general public. In addition, the conventional wireless video and audio transmission device has a problem in that it causes inconvenience to users by allowing a user to operate a tuner included in a video and audio signal due to external influences during transmission, and also included in a television set as a user. Was hugging.

On the other hand, the video and audio transmission apparatus using a transmission cable is effective in preventing the effective utilization of the radio transmission frequency of the wireless video and audio transmission apparatus and the distortion and noise generation of the video and audio signals to be transmitted, but the reproduced video and When watching audio, the user has to bear the trouble of connecting the transmission cable, and also has a problem that the connection port is damaged due to frequent connection of the transmission cable. The problem of the wired video and audio transmission apparatus will be described with reference to FIG.

Referring to FIG. 1, the camcorder 10 having the first connector 4 mounted on the bottom surface of the pedestal 12 so as to have a locking step for outputting the reproduced or captured video signal and the reproduced audio signal to the outside. It is settled in the recessed part 24 formed in the upper surface. The main portion 24 of the pedestal 10 is provided with a second connector 16 to be connected to the first connector 14 installed on the camcorder 10, and the second connector 16 is connected to the transmission lines. The third to fifth connectors 18 to 22 are connected to each other. The third to fifth connectors 18 to 22 are connected to video and audio input terminals of a television (not shown), respectively. The camcorder 10 is separated from the pedestal 12 when the subject is photographed, and when the video and audio recorded on the cassette tape are played back, the lower part is coupled to the latching jaw and the first connector 14 is formed. It is placed in the recessed part 24 of the pedestal 12 by the pressure and thrust applied by the user to connect to the two connectors 16.

As described above, the conventional video and audio transmission apparatus consisting of transmission lines and connections is frequently connected and disconnected from the camcorder and television by the user to transmit the video and audio signals reproduced on the camcorder. It has a problem that it is damaged and a connection defect of a connection port occurs. In addition, the conventional video and audio transmission apparatus has a problem that the user burdens the user hassle to connect or disconnect the connection roll camcorder and television.

Accordingly, an object of the present invention is to provide a video and audio transmission apparatus for a video recording and reproducing apparatus capable of transmitting video and audio signals reproduced from a recording medium to a display device without using a radio transmission frequency band and a transmission cable.

In order to achieve the above object, the video and audio transmission apparatus for a video recording and reproducing system of the present invention includes frequency modulating means for frequency modulating a reproduced video signal and an audio signal, a frequency modulated reproduced video from the frequency modulating means, and Transmission conversion means for converting and transmitting an audio signal into an optical signal form, and photoelectric conversion means for receiving an optical signal transmitted from the all-optical conversion means and converting it into a frequency-modulated video and audio signal having an electrical signal; And frequency demodulating the frequency-modulated video and audio signals from the photoelectric conversion means to generate playback video and audio signals and to supply the generated playback video and audio signals to the display device.

Other objects and advantages of the present invention in addition to the above objects will become apparent from the detailed description of the following embodiments with reference to the accompanying drawings.

Hereinafter, with reference to FIGS. 2 and 3 attached to an embodiment of the present invention will be described in detail.

Referring to FIG. 2, an image processing circuit 25 for reproducing a video signal recorded on a cassette tape (not shown) embedded in the main body 64 of a camcorder and reproducing an audio signal recorded on the cassette tape Camcorder to which the video and audio transmission apparatus according to an embodiment of the present invention having a sound processing circuit 26 for the present invention is described. The video signal reproduced by the image processing circuit 25 is frequency-modulated in a first frequency modulator 28 (hereinafter referred to as an FM modulator) 28 and supplied to the first driver 34. The voice processing circuit 26 separates the reproduced voice signal into an L-channel voice signal having voice and an R-channel voice signal having music, and divides the separated L-channel voice signal and the R-channel voice signal into second and third FM modulators. Supply to (30, 32). The second FM modulator 30 modulates the L channel voice signal from the voice processing circuit 26 to supply the frequency-modulated L channel voice call to the second driver 36, and the third FM modulator 32. ) Also FM modulates the R channel voice signal from the voice processing circuit 26 to supply the FM modulated R channel voice signal to the third driver 38. Then, the first driver 34 flashes the first infrared light emitting element 40 according to the logic change of the FM modulated video signal from the first FM modulator 28 so that the FM modulated video signal is an infrared signal type. To be sent out.

The second driver 36 flashes the second infrared light emitting element 42 according to the amplitude change of the FM modulated L channel voice signal from the second FM modulator 30 so that the FM modulated L channel voice signal is an infrared signal. To be sent in the form. In addition, the third driver 38 also flashes the third infrared light emitting element 44 in accordance with the amplitude change of the FM modulated R channel voice signal from the third FM modulator 32, so that the FM modulated R channel voice signal is generated. It transmits in the form of infrared signal. As a result, the first to third infrared light emitting devices 40 to 44 convert the FM-modulated video and audio signals into optical signals.

The comcoder system receives the infrared signals transmitted from the first to third infrared light emitting devices 40 to 44, respectively, and converts the infrared signals into the form of electrical signals. The first and third frequency demodulators are referred to as FM demodulators. Camcorder base 66 which has the 1st-3rd infrared light receiving elements 46-50 which respectively supply to 52-56 is provided. The electrical signal output from the first infrared light emitting device 40 has an FM modulated playback video signal, and the electrical signal output from the second infrared light emitting device 42 is an FM modulated L channel audio signal. The electrical signal output from the infrared light receiving element 44 has an FM modulated R channel voice signal. The first FM demodulator 52 frequency demodulates the electrical signal from the first infrared ray photoelectric element 46 to generate a reproduced video, and connects the demodulated reproduced video signal to the connection terminal 58 of the first connector 58. -1) and to the television 60 via the transmission line 59-1. The second FM demodulator 54 frequency demodulates the electrical signal from the second infrared optical element 48 to generate an L-channel audio signal, and the third FM demodulator 56 passes to the third infrared light receiving element 50. R-channel voice signal is generated by frequency demodulation of the electrical signal. Further, the second connector 59 is a first to third connection terminals 58-1 to 58 that are supplied with video signals, L-channel and R-channel audio signals from the first to third FM demodulators 52 to 56, respectively. -3), wherein the first to third connection terminals 58-1 to 58-3 of the first connection port 58 are connected to the television (1) through the first to third transmission lines 59-1 to 59-3. 60). Meanwhile, the second connector 62 also receives the first connection terminal 62-1 connected to the image processing circuit 25 and the reproduced L channel and R channel audio signals, respectively, to receive the reproduced video signal. The second and third connection terminals 62-2 and 62-3 connected to the audio processing circuit 26 are provided. The first to third connection terminals 62-1 to 62-3 of the second connector 62 are connected to the television 60 by a transmission line (not shown).

Then, the television 60 processes the video signal and the audio signal supplied from the first connector 58 or the second connector 62 via the transmission line so that the user can view it.

In FIG. 3, a camcorder with a video and audio transmission apparatus according to an embodiment of the present invention having a camcorder order body 64 having a first circuit board 68 and a pedestal 66 having a second circuit section 69 is provided. The order system is shown. Three through holes 70 to 74 are formed in the bottom of the camcorder order body 64, and the light emitting lead is formed in the through holes without the first to third infrared light emitting elements 34 to 38 being led to the outside. It is installed to be exposed to misuse.

The first to third infrared light emitting elements 34 to 38 are connected to the first circuit board 68. In addition, a second connector 62 is provided on the rear wall surface of the camcorder order body 64, and the second connector 62 is connected to the first circuit board 68. On the other hand, the pedestal 66 has a recess portion 76 formed on the upper surface so as to insert the lower end of the camcorder order body 64, the recess portion 76 has a through hole formed in the bottom surface of the camcorder order body 64 Three through holes 78 to 82 are formed to face the fields 70 to 74, respectively. The through holes 78 to 82 formed in the recess 76 are provided so that the first to third infrared light receiving elements 46 to 50 are exposed without being led out to the outside, and the first to third infrared light receiving elements 46 to 82 are exposed. 50 is connected to the second circuit board 69. A first connector 58 connected to the second circuit board 69 is provided on the rear wall of the pedestal 66. In addition, the first to third infrared light emitting devices 34 when the lower end of the camcorder body 64 is placed in the recessed portion 76 of the pedestal 66. The infrared signal from each of the first to third infrared light emitting elements 34 to 38 opposed to each other is received.

As described above, the present invention is to carry the reproduced video and audio signal to the optical signal such as infrared transmission so that the general public can effectively utilize the radio transmission frequency and can remove the transmission cable. In addition, the present invention has an advantage of eliminating ancillary operations such as connection of a transmission cable and operation of a tuner when viewing a playback video and an audio signal reproduced on a recording medium.

And while the spirit of the present invention has been described with reference to one embodiment, it will be understood by those skilled in the art that the present invention may be implemented by changing or modifying within the spirit and scope of the present invention. For example, circuits and infrared light emitting elements installed on the base of the camcorder are installed in the television, and circuits and infrared light emitting elements installed on the main body of the camcorder are installed in the VCR to transmit the video and audio reproduced by the VCR to the television. Can be. Therefore, the spirit and scope of the present invention will be limited by the scope of the following utility model registration claims.

Claims (5)

Frequency modulating means for frequency modulating a reproduced video signal and an audio signal, all-optical converting means for converting and transmitting a frequency-modulated reproduced video and audio signal from the frequency modulating means into an optical signal form, and the all-optical converting means Photoelectric conversion means for receiving an optical signal transmitted from the optical signal and converting the optical signal into a frequency-modulated video and audio signal having an electrical signal, and performing frequency demodulation on the frequency-modulated video and audio signal from the photoelectric conversion means. And a frequency demodulation means for generating a signal and for supplying the generated playback video and audio signal to a display device. 2. The apparatus according to claim 1, wherein the all-optical converting means comprises: a first driver for blinking a first light emitting element in accordance with an amplitude of a frequency-modulated reproduced video signal from the frequency modulating means, and a frequency modulating from the frequency modulating means; And a second drive unit for blinking the second light emitting digit according to the amplitude of the reproduced audio signal. The video and audio transmission device for a video recording and reproducing system according to claim 2, wherein the first and second light emitting devices are infrared light emitting devices. The reproduction video signal according to claim 1, wherein the reproduction audio signal includes a left audio signal having a voice component and a right music signal having a music component, wherein the frequency modulating means performs frequency modulation on the reproduction video signal to perform frequency modulation. A first frequency modulator for supplying to the all-optical converting means, a second frequency modulator for supplying the reproduced audio signal of the left channel with frequency modulation by frequency-modulating the reproduced sound signal of the reproduced left channel; And a third frequency modulator for frequency modulating the reproduced audio signal of the right channel to supply the reproduced audio signal of the right channel with frequency modulation to the all-optical converting means. 5. The apparatus as claimed in claim 4, wherein the all-optical change means includes: a first light emitting element flashing in accordance with an amplitude of a frequency-modulated playback video signal from the first frequency modulator, and a frequency-modulated left side from the second frequency modulator. And a third light emitting device which flickers according to the amplitude of the reproduction audio signal of the channel, and a third light emitting device which flickers according to the amplitude of the reproduction audio signal of the right channel which is frequency-modulated from the third frequency modulator. A video and audio transmission device for a video recording and playback system.