JP2004088690A - Image receiver and image transmission system including the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image receiver which can display correct time and output a time signal. <P>SOLUTION: If a received image is delayed as in the case where a broadcast is viewed and listened at an arbitrary place via a portable television which cannot directly receive radio waves from a broadcasting station, the correct time can be displayed by adding time data from the standard clock 10 to the image received by the image receiver and displayed on the screen. Thus, a clock at hand can be set correctly by the time displayed on the television image. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a video receiving apparatus and a video transmission system including the same, and more particularly to a video receiving apparatus that receives a wirelessly transmitted video signal and a video transmission system including the video receiving apparatus.
[0002]
[Prior art]
FIG. 11 is a block diagram showing a schematic configuration of a conventional video transmission system. In FIG. 11, the video transmission system 60 includes a video transmission device 30 and a video reception device 40.
[0003]
The video transmission device 30 includes a video input terminal 31, an audio input terminal 32, a video analog / digital conversion circuit (hereinafter, referred to as a video A / D conversion circuit) 33, a data compression circuit 34, a wireless transmission circuit 35, a voice analog / digital A conversion circuit (hereinafter, referred to as an audio A / D conversion circuit) 36, an antenna terminal 37, and an antenna 38 are included.
[0004]
The video input terminal 31 is connected to a data compression circuit 34 via a video A / D conversion circuit 33, and the audio input terminal 32 is connected to a data compression circuit 34 via an audio A / D conversion circuit 36. An output terminal of the data compression circuit 34 is connected to an antenna terminal 37 via a wireless transmission circuit 35, and an antenna 38 is connected to the antenna terminal 37.
[0005]
The video receiving device 40 includes an antenna 41, an antenna terminal 42, a wireless receiving circuit 43, a data expansion circuit 44, a video digital / analog conversion circuit (hereinafter, referred to as a video D / A conversion circuit) 45, a video output terminal 50, and an audio digital. / Analog conversion circuit (hereinafter referred to as audio D / A conversion circuit) 49 and audio output terminal 51.
[0006]
The antenna 41 is connected to an antenna terminal 42, and the antenna terminal 42 is connected to a data expansion circuit 44 via a wireless reception circuit 43. The output terminal of the data decompression circuit 44 is connected to the video output terminal 50 via the video D / A conversion circuit 45 and to the audio output terminal 51 via the audio D / A conversion circuit 49.
[0007]
Next, the operation of the video transmission system 60 shown in FIG. 11 will be described. In the video transmitting device 30, the video input terminal 31 and the audio input terminal 32 are connected to a video reproducing device such as a VTR (not shown). The analog video signal input from the video playback device to the video input terminal 31 is converted into a digital video signal by the video A / D conversion circuit 33 and input to the data compression circuit 34.
[0008]
The analog audio signal input from the video playback device to the audio input terminal 32 is converted into a digital audio signal by the audio A / D conversion circuit 36 and input to the data compression circuit 34.
[0009]
The data compression circuit 34 performs data compression on the input digital video signal and digital audio signal, and converts the data into a data compressed video / audio signal. The wireless transmission circuit 35 converts the data compressed video / audio signal into a high-frequency signal (RF), and transmits the high-frequency signal (RF) from the antenna 38 to the video receiver 40.
[0010]
In the video receiving device 40, a high-frequency signal (RF) from the video transmitting device 30 is received by an antenna 41 and converted into an original data compressed video / audio signal by a wireless receiving circuit 43. The data expansion circuit 44 expands the data compressed video / audio signal and converts it into the original digital video signal and digital audio signal.
[0011]
The digital video signal is converted into an original analog video signal by the video D / A conversion circuit 45 and output from the video output terminal 50. The digital audio signal is converted into an original analog audio signal by the audio D / A conversion circuit 49 and output from the audio output terminal 51.
[0012]
If the video output terminal 50 and the audio output terminal 51 are connected to, for example, an external input terminal of a television (not shown), an image and a voice from a video reproducing device such as a VTR (not shown) connected to the video transmitting device 30 are transmitted to the video receiving device. It can be viewed on a television (not shown) connected to 30.
[0013]
[Problems to be solved by the invention]
However, the conventional video transmission system has a problem in that a delay occurs by the time required for data compression and data decompression, and the time display and the time signal are later than the actual time. For this reason, the time at hand and the time signal displayed on the television image could not be set accurately. This delay time is about 1 second in the case of the MPEG2 specification, for example.
[0014]
Therefore, a main object of the present invention is to provide a video receiving apparatus and a video transmission system capable of performing accurate time display and time signal output.
[0015]
[Means for Solving the Problems]
A video receiving apparatus according to the present invention includes: a wireless receiving circuit that receives an input high-frequency signal; a data decompression circuit that returns a data compression signal included in the received high-frequency signal to an original digital video signal and digital audio signal; It includes a video digital / analog conversion circuit for converting a video signal into an analog video signal, and an audio digital / analog conversion circuit for converting an input digital audio signal into an analog audio signal. In this video receiving apparatus, clock means for outputting a time data signal indicating time, on-screen display means for adding a time data signal to an analog video signal to display time data on a screen, and Control means for controlling the on-screen display means so as to add the time data signal to the analog video signal for a predetermined display time.
[0016]
Preferably, the time data signal is added to the analog video signal from a predetermined display time before the standard time to the standard time.
[0017]
Preferably, a display time adjusting means for adjusting the display time to a desired time is further provided.
[0018]
Preferably, a time signal sound adding means for adding a time signal to the analog audio signal to generate a time sound is provided, and the control means includes a predetermined additional time based on a time data signal from the clock means. Only the time signal sound adding means is controlled to add the time signal signal to the analog audio signal.
[0019]
Preferably, the time data signal is added to the analog audio signal from a predetermined additional time before the standard time to the standard time.
[0020]
Preferably, the time signal signal adding means further includes a switching circuit for temporarily stopping the audio signal being transmitted during the time signal signal addition period and switching to the time signal sound.
[0021]
Preferably, a time signal sound addition time adjusting means for adjusting the time for adding the time signal signal to a desired time is further provided.
[0022]
Preferably, a first selection unit for selecting whether or not to use the function of the on-screen display unit is further provided.
[0023]
Also, preferably, the first selecting means includes a switch for selecting whether to use the function of the on-screen display means according to on / off.
[0024]
Preferably, the first selecting means includes an input terminal for inputting an external control signal.
[0025]
Preferably, the first selecting means includes a remote control light receiving means for receiving the infrared remote control signal, converting the signal into an electric signal, and transmitting the electric signal to the control means.
[0026]
Preferably, a second selecting means for selecting whether to use the function of the time signal signal adding means is further provided.
[0027]
Preferably, the second selecting means includes a switch for selecting whether to use the function of the time signal sound adding means depending on ON / OFF.
[0028]
Preferably, the second selecting means includes an input terminal for inputting an external control signal.
[0029]
Preferably, the second selection means includes a remote control light receiving means for receiving the infrared remote control signal, converting the signal into an electric signal, and transmitting the electric signal to the control means.
[0030]
Preferably, the time data signal adding means further replaces the analog video signal with a blue-back video signal for displaying a blue-back background, and adds the time data signal to the blue-back video signal.
[0031]
Further, the video transmission system according to the present invention is a video analog / digital conversion circuit for converting an input analog video signal to a digital video signal, and an audio analog / digital conversion circuit for converting an input analog audio signal to a digital signal. A video transmission device including a data compression circuit for compressing digital video signals and digital audio signals, and a radio circuit for converting the compressed video and audio signals from the data compression circuit into high-frequency signals and transmitting the high-frequency signals; And an apparatus.
[0032]
BEST MODE FOR CARRYING OUT THE INVENTION
[Embodiment 1]
FIG. 1 is a circuit block diagram showing a schematic configuration of a video transmission system 1 according to Embodiment 1 of the present invention. 1, the video transmission system 1 includes a video transmission device 30 and a video reception device 2. The video transmitting device 30 is the same as that shown in FIG.
[0033]
The video receiving device 2 includes an antenna 3, an antenna terminal 4, a wireless receiving circuit 5, a data decompression circuit 6, a video D / A conversion circuit 7, an on-screen generation circuit 8, a control circuit 9, a standard clock 10, a video output terminal 12, An audio D / A conversion circuit 11 and an audio output terminal 13 are included.
[0034]
The antenna 3 is connected to an antenna terminal 4, and the antenna terminal 4 is connected to a data expansion circuit 6 via a wireless reception circuit 5. The output terminal of the data expansion circuit 6 is connected to an on-screen generation circuit 8 via a video D / A conversion circuit 7. The output terminal of the on-screen generation circuit 8 is connected to the video output terminal 12. The output terminal of the data decompression circuit 6 is also connected to the audio D / A conversion circuit 11, and is connected to the audio output terminal 13 via the circuit 11. The output terminal of the standard timepiece 10 is connected to the on-screen generation circuit 8 via the control circuit 9.
[0035]
Next, the operation of the video transmission system 1 shown in FIG. 1 will be described. The video transmission device 30 is connected to a video playback device such as a VTR (not shown). Although a detailed description is omitted, the video signal and the audio signal from the video reproducing apparatus are subjected to data compression, converted into a high-frequency signal, and transmitted from the antenna 38.
[0036]
In the video receiving device 2, a high frequency signal (RF) from the video transmitting device 30 is received by the antenna 3, and is converted into the original data compressed video / audio signal by the wireless receiving circuit 5. The data decompression circuit 6 decompresses the data compressed video / audio signal and converts it into an original digital video signal and digital audio signal. The output signal of the data decompression circuit 6 is converted by the video D / A conversion circuit 7 into the original analog video signal, and is also converted by the audio D / A conversion circuit 11 into the original analog audio signal.
[0037]
The analog video signal generated by the video D / A conversion circuit 7 is input to an on-screen generation circuit 8, a standard time display signal is added by the on-screen generation circuit 8, and output from a video output terminal 12. The video transmission system 1 can be used, for example, by connecting the video transmission device 30 to a VTR that can directly receive radio waves from a broadcast station, and installing the video reception device 2 on a portable television that cannot directly receive radio waves from a broadcast station. In some cases, the user may view a broadcast at an arbitrary place.
[0038]
The on-screen generation circuit 8 is controlled by a control circuit 9 connected to a standard clock 10. The control circuit 9 is formed of, for example, a microcomputer and includes first to third ports P1, P2, and P3. Switches SW1, SW2, and SW3 are connected to the first to third ports P1, P2, and P3, respectively.
[0039]
FIG. 2 is a flowchart showing the operation of the control circuit 9. In this flowchart, on-screen display is performed from t seconds before the time signal time to the time signal time.
[0040]
In step S1, it is detected whether or not the third port P3 of the control circuit 9 is set to the "L" level by the switch SW3. If the third port P3 is at the "H" level, the process proceeds to step S2. If it is not the "H" level (if it is the "L" level), the process returns to step S1, and the on-screen display is not performed.
[0041]
In step S2, if the clock data from the standard clock is 59 minutes (60-t) seconds, the process proceeds to step S3, the time data is displayed on the screen, and the process proceeds to step S4. If not, the process returns to step S1 and repeats until the clock data from the standard clock reaches 59 minutes (60-t) seconds.
[0042]
In step S4, if the clock data from the standard clock is not 00:00, the process returns to step S3, and the time data is kept displayed on the screen. When the clock data from the standard clock reaches 00:00, the process proceeds to step S5, where the on-screen display is turned off, and the process returns to step S1.
[0043]
Therefore, according to the first embodiment, it is possible to set whether to perform on-screen display or not, and to set on-screen display from t seconds before the time signal time to the time signal time.
[0044]
FIG. 3 is a flowchart showing a method for setting the on-screen display seconds (t seconds) for performing on-screen display from t seconds before the time signal time to the time signal time in the operation of the control circuit 9.
[0045]
In step S11, it is detected whether or not the first port P1 of the control circuit 9 is set to the “L” level by the switch SW1, and if it is the “L” level, the process proceeds to step S14, where 1 second is added to t seconds. Then, the process returns to step S11. If it is at the "H" level (not at the "L" level), the process proceeds to step S12 to detect whether or not the second port P2 of the control circuit 9 is at the "L" level by the switch SW2. , "L" level, the process proceeds to step S13, where 1 second is subtracted from t seconds. If it is at the "H" level (not at the "L" level), the process returns to step S11. Therefore, the on-screen display seconds (t seconds) can be set to an arbitrary number of seconds.
[0046]
[Embodiment 2]
FIG. 4 is a circuit block diagram showing a schematic configuration of the video receiving device 20 according to the second embodiment of the present invention.
[0047]
In FIG. 4, in the video receiving apparatus 20, a high frequency signal (RF) received by the antenna 3 is converted by the wireless receiving circuit 5 into an original data compressed video / audio signal. The data decompression circuit 6 decompresses the data compressed video / audio signal and converts it into an original digital video signal and digital audio signal. The output signal of the data decompression circuit 6 is converted by the video D / A conversion circuit 7 into the original analog video signal, and is also converted by the audio D / A conversion circuit 11 into the original analog audio signal.
[0048]
The analog audio signal generated by the audio D / A conversion circuit 11 is input to the time signal generation circuit 15 via the sound mute switch 14, and the time signal generation circuit 15 adds the time signal signal to output the audio signal. Output from terminal 13. The audio mute switch 14 and the time signal generating circuit 15 are controlled by a control circuit 16 connected to the standard timepiece 10.
[0049]
The control circuit 16 is composed of, for example, a microcomputer and includes first to fifth ports P1, P2, P3, P4, and P5. Switches SW4, SW5, SW6, and SW7 are connected to the first to fourth ports P1, P2, P3, and P4, respectively, and P5 is connected to the audio mute switch 14.
[0050]
FIG. 5 is a flowchart showing the operation of the control circuit 16 shown in FIG. In this flowchart, a time signal sound is output from t seconds before the time signal time to the time signal time.
[0051]
In step S21, the control circuit 16 detects whether or not the fourth port P4 is set to “L” level by the switch SW7, and if it is “H” level, the process proceeds to step S22. If it is not the "H" level (if it is the "L" level), the process returns to step S21, and the time signal is not output.
[0052]
In step S22, the control circuit 16 detects whether or not the third port P3 is set to the “L” level by the switch SW6. If the third port P3 is “L” level, the process proceeds to step S23, where the third port P3 is set via the fifth port P5. Then, the audio mute switch 14 is controlled to cut off the audio signal from the audio D / A conversion circuit 11, that is, to mute the audio, and the process proceeds to step S24. If it is not the "L" level (if it is the "H" level), the audio mute is not performed, and the process shifts to step S24.
[0053]
In step S24, if the clock data from the standard clock 10 is 59 minutes (60-t) seconds, the process proceeds to step S25, a time signal is generated, and the process proceeds to step S26. If not, the process returns to step S21 and repeats until the clock data from the standard clock 10 reaches 59 minutes (60-t) seconds.
[0054]
In step S26, if the clock data from the standard clock 10 is not 00:00, the process returns to step S25, and the time signal continues to be output. When the clock data from the standard clock 10 reaches 00:00, the process proceeds to steps S27 and S28, where the time signal is stopped, and if the audio mute is performed, the audio mute is released and the process returns to step S21.
[0055]
Therefore, according to the second embodiment, the setting of whether or not to output the time signal, the setting of whether or not to mute the sound, and the setting of the time signal output from t seconds before the time signal to the time signal time. Can be realized.
[0056]
FIG. 6 shows a method of setting the time signal sound generation seconds (t seconds) for outputting the time signal sound from the time t seconds before the time signal time to the time signal time in the operation of the control circuit 16 of the video receiving device 20. It is a flowchart.
[0057]
In step S31, the control circuit 16 detects whether or not the first port P1 is set at the “L” level by the switch SW4. If the first port P1 is at the “L” level, the process proceeds to step S34, where one second is set for t seconds. And returns to step S31. If it is at the "H" level (but not at the "L" level), the process proceeds to step S32. In step S32, the control circuit 16 detects whether or not the second port P2 is set to the “L” level by the switch SW5. If the second port P2 is “L” level, the control circuit 16 proceeds to step S33 and sets t seconds to 1 second. Subtract. If it is at the "H" level (not at the "L" level), the process returns to step S31. Therefore, the number of seconds (t seconds) of the time signal sound generation can be set to an arbitrary number of seconds.
[0058]
[Embodiment 3]
FIG. 7 is a circuit block diagram showing a schematic configuration of a video receiving device 21 according to Embodiment 3 of the present invention.
[0059]
Referring to FIG. 7, this video receiving apparatus 21 differs from video receiving apparatus 2 of FIG. 1 in that external control input terminal 17 is added. In the video receiver 21, the external control input terminal 17 is connected to the control circuit 9, and the presence or absence of the on-screen display and the setting of the on-screen display seconds (t seconds) described in the first embodiment are set by the external control signal. Is possible. Therefore, since there is no need to directly operate the switches SW1 to SW3, the presence / absence of on-screen display and the setting of the on-screen display seconds (t seconds) can be easily performed.
[0060]
[Embodiment 4]
FIG. 8 is a circuit block diagram showing a schematic configuration of a video receiving device 22 according to Embodiment 4 of the present invention.
[0061]
Referring to FIG. 8, video receiving apparatus 22 differs from video receiving apparatus 20 of FIG. 4 in that external control input terminal 18 is added. In the video receiver 22, the external control input terminal 18 is connected to the control circuit 16, and the presence / absence of the time signal sound, the presence / absence of the sound mute, and the time signal sound generation seconds (described in the second embodiment) by the external control signal. t seconds). Therefore, since there is no need to directly operate the switches SW4 to SW7, it is possible to easily set the presence / absence of the time signal sound, the presence / absence of the sound mute, and the number of seconds (t seconds) of the time signal sound generation.
[0062]
[Embodiment 5]
FIG. 9 is a circuit block diagram showing a schematic configuration of a video receiving device 23 according to Embodiment 5 of the present invention.
[0063]
In FIG. 9, the video receiving device 23 is obtained by combining the video receiving devices 21 and 22 shown in FIGS. 7 and 8 into one, and replacing the external control input terminals 17 and 18 with a remote control light receiving unit 19. The output terminal of the remote control light-receiving unit 19 is connected to the control circuit 9 and the control circuit 16, and the presence or absence of the on-screen display and the number of seconds of the on-screen display (t seconds) described in the third embodiment are performed by the remote control light-receiving unit 19. , The presence / absence of a time signal sound, the presence / absence of an audio mute, and the setting of the time signal sound generation seconds (t seconds) described in the fourth embodiment.
[0064]
Embodiment 6
FIG. 10 is a circuit block diagram showing a schematic configuration of a video receiving device 24 according to Embodiment 6 of the present invention.
[0065]
10, in the video receiving apparatus 24, a blue-back generating circuit 25 is connected between an output terminal of the video A / D conversion circuit 7 and an input terminal of the on-screen generating circuit 8. A control circuit 26 is connected to the blue-back generating circuit 25, and a switch SW8 is connected to a port P1 of the control circuit 26.
[0066]
If the port P1 of the control circuit 26 is at "L" level, the blue-back generating circuit 25 operates, the output signal of the video D / A conversion circuit 7 is stopped, and the video signal for displaying the blue-back is output. If the signal is at the “H” level (not the “L” level), the blue-back generating circuit 25 does not operate, and the video signal from the video D / A conversion circuit 7 is output as it is. Therefore, in the sixth embodiment, the background of the time signal display unit is set to blue, so that the time signal display is easy to see.
[0067]
The embodiments disclosed this time are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.
[0068]
【The invention's effect】
As described above, in the video receiving apparatus according to the present invention, the wireless receiving circuit that receives the input high-frequency signal, and returns the data compression signal converted from the received high-frequency signal to the original digital video signal and digital audio signal A data decompression circuit, a video digital / analog conversion circuit for converting a digital video signal into an analog video signal, and an audio digital / analog conversion circuit for converting an input digital audio signal into an analog audio signal, indicating a standard time. Clock means for outputting a time data signal, on-screen display means for adding a standard time data signal to the analog video signal, and adding a time data signal to the analog video signal for a predetermined display time based on the time data signal Control means for controlling the on-screen display means as described above. Therefore, the conventional problem that the time display required for compression / expansion of video data delays the time display from the broadcasting station is solved, and the time display displayed on the television image becomes accurate.
[0069]
Preferably, the time data signal is added to the analog video signal from a predetermined display time before the standard time to the standard time. In this case, since the time display disappears after the standard time, the received original image without the time display is displayed.
[0070]
Preferably, a display time adjusting means for adjusting the display time to a desired time is further provided. In this case, a desired display time can be set before the start of the time signal time display so as not to interfere with the program being viewed.
[0071]
Preferably, further, a time signal sound adding means for adding a time signal to the analog audio signal to generate a time sound is provided, and the control means includes a predetermined time addition signal based on time data from the clock means. The time signal sound adding means is controlled so that the time signal signal is added to the analog audio signal only for the time. Therefore, not only on-screen display but also accurate time signal sound can be output from the speaker.
[0072]
Preferably, the time data signal is added to the analog audio signal from a predetermined additional time before the standard time to the standard time. In this case, since the time signal is not output after the standard time, the received original sound without the time signal is output.
[0073]
Also preferably, the time signal sound adding means includes a switching circuit for temporarily stopping the audio signal being transmitted during the time signal sound addition period and switching to the time signal sound. Therefore, by temporarily stopping the audio signal being transmitted, the time signal can be heard more effectively.
[0074]
Preferably, a time signal sound addition time adjusting means for adjusting the time for adding the time signal signal to a desired time is further provided. Therefore, it is possible to adjust a desired time signal sound adding time before starting the time signal time display so as not to hinder a program or the like being viewed.
[0075]
Preferably, a first selection unit for selecting whether or not to use the function of the on-screen display unit is further provided.
[0076]
Also, preferably, the first selecting means includes a switch for selecting whether to use the function of the on-screen display means according to on / off.
[0077]
Preferably, the first selecting means includes an input terminal for inputting an external control signal.
[0078]
Preferably, the first selection means includes a remote control light receiving means for receiving the infrared remote control signal, converting the signal into an electric signal, and transmitting the electric signal to the control means.
[0079]
Preferably, a second selecting means for selecting whether to use the function of the time signal signal adding means is further provided.
[0080]
Preferably, the second selecting means includes a switch for selecting whether to use the function of the time signal sound adding means depending on ON / OFF.
[0081]
Preferably, the second selecting means further includes an input terminal for inputting an external control signal.
[0082]
Preferably, the second selection means is provided with a remote control light receiving means for receiving the infrared remote control signal, converting the signal into an electric signal, and transmitting the electric signal to the control means. Therefore, if desired, it is possible to set on / off of the on-screen display, on / off of the time signal, and control thereof by using a switch built in the main body, a control signal from the outside, or a remote controller.
[0083]
Preferably, the time data signal adding means further replaces the analog video signal with a blue-back video signal for displaying a blue-back background, and adds the time data signal to the blue-back video signal. Therefore, even when there is no video signal being transmitted, it is possible to display the on-screen time on the blue screen background on the television screen.
[0084]
Also, in the video transmission system according to the present invention, a video analog / digital conversion circuit for converting an input analog video signal to a digital video signal, and an audio analog / digital conversion circuit for converting an input analog audio signal to a digital signal A video transmission device including: a data compression circuit for compressing data of a digital video signal and a digital audio signal; and a radio circuit for converting a compressed video and audio signal from the data compression circuit into a high-frequency signal and transmitting the signal. An apparatus is provided. Therefore, according to the present invention, the problem that the time display and the time signal sound are delayed in the video transmission system that performs data compression / expansion is solved.
[Brief description of the drawings]
FIG. 1 is a circuit block diagram illustrating a schematic configuration of a video transmission system according to a first embodiment of the present invention.
FIG. 2 is a flowchart showing an operation of the control circuit shown in FIG.
FIG. 3 is another flowchart showing the operation of the control circuit shown in FIG. 1;
FIG. 4 is a circuit block diagram illustrating a schematic configuration of a video receiving device according to a second embodiment of the present invention.
FIG. 5 is a flowchart showing an operation of the control circuit shown in FIG. 4;
FIG. 6 is another flowchart showing the operation of the control circuit shown in FIG. 4;
FIG. 7 is a circuit block diagram showing a schematic configuration of a video receiving device according to a third embodiment of the present invention.
FIG. 8 is a circuit block diagram showing a schematic configuration of a video receiving device according to a fourth embodiment of the present invention.
FIG. 9 is a circuit block diagram showing a schematic configuration of a video receiving device according to a fifth embodiment of the present invention.
FIG. 10 is a circuit block diagram illustrating a schematic configuration of a video receiving device according to a sixth embodiment of the present invention.
FIG. 11 is a block diagram illustrating a schematic configuration of a conventional video transmission system.
[Explanation of symbols]
1,60 video transmission system, 2,20,21,22,23,24,40 video receiving device, 3,41 antenna, 4,42 antenna terminal, 5,43 wireless receiving circuit, 6,44 data expansion circuit, 7 , 45 video D / A conversion circuit, 8 on-screen generation circuit, 9, 16, 26 control circuit, 10 standard clock, 11, 49 audio D / A conversion circuit, 12, 50 video output terminal, 13, 51 audio output terminal , 14 audio mute switch, 15 hour alarm sound generation circuit, 17, 18 external control input, 19 remote control light receiving section, 25 blue back generation circuit, 30 video transmission device, 31 video input terminal, 32 audio input terminal, 33 antenna terminal, 34 data compression circuit, 35 wireless transmission circuit, 36 video D / A conversion circuit, 37 transmission antenna terminal, 38 transmission antenna.

Claims (17)

A wireless receiving circuit that receives an input high-frequency signal, a data decompression circuit that converts a data compression signal converted from the received high-frequency signal back to an original digital video signal and digital audio signal, and converts a digital video signal to an analog video signal A video digital / analog conversion circuit for converting an input digital audio signal into an analog audio signal, and a video digital / analog conversion circuit for converting an input digital audio signal into an analog audio signal.
Clock means for outputting a time data signal indicating the time;
On-screen display means for adding the time data signal to the analog video signal and displaying time data on a screen,
A video receiving apparatus comprising: a control unit that controls the on-screen display unit so as to add the time data signal to the analog video signal for a predetermined display time based on the time data signal. The video receiving apparatus according to claim 1, wherein the time data signal is added to the analog video signal from a time before the predetermined display time before a standard time to a standard time. 3. The video receiving apparatus according to claim 1, further comprising a display time adjusting unit that adjusts the display time to a desired time. Further, a time signal sound adding means for adding a time signal to the analog audio signal to generate a time signal,
The control means controls the time signal signal adding means to add the time signal signal to the analog audio signal for a predetermined additional time based on a time data signal from the clock means. The video receiving apparatus according to claim 1, wherein the video receiving apparatus performs the processing. 5. The video receiving apparatus according to claim 4, wherein the time data signal is added to the analog audio signal from the time before the predetermined additional time before the standard time to the standard time. 6. The video according to claim 4, wherein the time signal sound adding means includes a switching circuit for temporarily stopping the audio signal being transmitted during the time signal sound addition period and switching to the time signal sound. Receiver. 7. The video receiving apparatus according to claim 4, further comprising a time signal sound adding time adjusting means for adjusting a time for adding the time signal signal to a desired time. . The video receiving apparatus according to any one of claims 1 to 7, further comprising a first selection unit that selects whether to use the function of the on-screen display unit. . 9. The video receiving apparatus according to claim 8, wherein the first selection unit includes a switch for selecting whether to use the function of the on-screen display unit according to on / off. 9. The video receiving apparatus according to claim 8, wherein said first selecting means includes an input terminal for inputting an external control signal. 11. The video receiving apparatus according to claim 10, wherein the first selection unit includes a remote control light receiving unit that receives an infrared remote control signal, converts the signal into an electric signal, and transmits the electric signal to the control unit. 12. The video receiving apparatus according to claim 4, further comprising a second selecting unit for selecting whether to use the function of the time signal signal adding unit. apparatus. 13. The video receiving apparatus according to claim 12, wherein the second selecting unit includes a switch for selecting whether to use the function of the time signal signal adding unit according to ON / OFF. 13. The video receiving apparatus according to claim 12, wherein said second selecting means includes an input terminal for inputting an external control signal. 15. The image receiving apparatus according to claim 14, wherein the second selection unit includes a remote control light receiving unit that receives an infrared remote control signal, converts the signal into an electric signal, and transmits the electric signal to the control unit. Further, the time data adding means replaces the analog video signal with a blue-back video signal for displaying a blue-back background, and adds a time data signal to the blue-back video signal. Item 16. The video transmission / reception device according to any one of items 15 to 15. A video analog / digital conversion circuit for converting an input analog video signal to a digital video signal, an audio analog / digital conversion circuit for converting an input analog audio signal to a digital signal, and converting the digital video signal and digital audio signal 17. A video transmission device including a data compression circuit for compressing data, and a radio circuit for converting a compressed video / audio signal from the data compression circuit into a high-frequency signal and transmitting the signal, and any one of claims 1 to 16. A video transmission system provided with the video receiving device according to claim 1.

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