JPH0884323A - Video signal processor - Google Patents

Abstract

PURPOSE: To display a signal with high definition without deteriorated image quality by multiplexing plural video signals with standard definition in time division onto one channel signal and sending the resulting signal as a high definition video signal. CONSTITUTION: Four kinds of video signals A-D are outputted from four sets of NTSC system television cameras 1-4 and fed to an image processing section 5. In the image processing section 5, the four NTSC system video signals are subject to time division multiplexing into one channel signal and then it is converted into a high definition video signal. The converted output signal is sent to a high definition transmission medium 7 via a transmitter 6. The signal from the high definition transmission medium 7 is received by a receiver 8 and only one desired video signal is extracted by a video selection section 9 and given to a definition conversion section 10, in which the signal is converted into a standard definition video signal. Then the reproduced signal is displayed on an NTSC system television monitor 11, on which a high definition video image is enjoyed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal processing device, and more particularly to a transmission system for high definition video signals.

[0002]

2. Description of the Related Art A so-called HDTV (high-definition television) system has been put into practical use as a method of using a high-definition video signal. However, in this method, MU
What is needed is a television receiver with an SE decoder and a display with an aspect ratio of 16: 9. Since such a television receiver is still expensive, it takes time to spread. Therefore, for the time being, of the images transmitted by the HDTV system, the images of interest to the viewer can be converted to the NTSC system on the receiving side and displayed on the NTSC system monitor receiver for use. It is believed that

[0003]

As described above, there is a problem in that an expensive television receiver is required for reproducing a conventional high definition image.

Therefore, the present invention has been made to solve such a problem, and an object of the present invention is to make use of the feature of transmitting a large amount of video information which the high definition video transmission system has, and to make use of the NTSC television. An object of the present invention is to provide a video signal processing device capable of displaying a video signal using a John receiver.

[0005]

A video signal processing apparatus according to the present invention comprises a multiplexing means for multiplexing video signals from a plurality of television image pickup devices into a signal of one channel, and a high-definition output of the multiplexed output. And a high-definition video signal converting means for converting the converted video signal into a video signal, and a transmitting means for transmitting the converted output.

Further, the video signal processing device according to the present invention is
Selecting means for receiving a transmission signal from the transmitting means and selecting one of a plurality of video signals; and standard definition video signal converting means for converting the selected output into a video signal of standard definition and outputting the video signal. And a display means for displaying the converted output on a screen.

[0007]

The high-definition video transmission system takes advantage of the fact that a large amount of video information can be transmitted. A high-definition video signal is obtained by time-divisionally multiplexing a plurality of standard-definition video signals into one channel signal. To transmit as. On the receiving side, one desired video signal is selected from the selected video signals and displayed on an NTSC system monitor.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a system block diagram of an embodiment of the present invention. In FIG. 1, four types of video signals A to D are output from four NTSC television cameras 1 to 4 and supplied to the image processing unit 5.

In the image processing unit 5, four NTSC video signals are time-division multiplexed as one-channel signals and then converted into high definition video signals. This converted output signal is sent to the high definition transmission medium 7 via the transmission device 6.

The signal from the high-definition transmission medium 7 is received by the receiver 8, the desired one image signal is extracted by the image selecting section 9, and the standard-definition image signal is extracted by the definition converting section 10. It is said that Then, it is reproduced and displayed on the television for receiving television 11 of the NTSC system.

FIG. 2 is a block diagram showing an example of the image processing section 5. The four standard definition video signals A to D are respectively input to the buffers 51 to 54 and temporarily stored therein.
The video signals stored in each of the buffers 51 to 54 are sequentially read by a read signal generated from the control device 58, and are selectively derived by the selector 55 as a serial signal.

An example of the output signal of the selector 55 in this case is shown in FIG. 3A, in which the video signal A is selected during the first 1V (vertical synchronization period) and during the next 1V. Is output after being serialized in a time division manner such that B is selected. That is, the four video signals A to D are time-division multiplexed with the signal of one channel. This multiplexing control is performed by a select signal from the control device 58. The portion X in FIG. 3A is the vertical synchronization signal portion.

The signal a thus multiplexed is compressed by the HDTV converter 56 by an image compression technique and converted into a high definition video signal. The output after this conversion is the selector 5
7 and the identification flags for identifying the respective video signals A to D are inserted into the respective vertical synchronizing signal sections of the corresponding video signal. An example is shown in FIG.

It is assumed that the identification flags 1 to 3 are generated from the video signal identification flag 59.

A concrete example of the video signal selection section 9 and the definition conversion section 10 on the receiving side is shown in FIG. The received video signal is input to the video signal identification flag detection unit 91, the flag inserted in the vertical synchronization signal portion is extracted, and is guided to the control device 94.

The control device 94 compares the preset video selection signal from the outside with the flag and selects only the video signal corresponding to the coincident flag so that the write signal d synchronized with this coincidence timing is selected. It is generated and output to the buffer 93.

On the other hand, the video signal that has passed through the video signal identification flag detecting section 91 is input to the HDTV decoder 92 and the image is restored, and the high definition video signal is converted into the standard definition video signal C. The converted video signal is input to the buffer 93 and is written in the buffer 93 in synchronization with the write signal d from the control device 94.

FIGS. 3C and 3D show the waveform examples of FIGS. 4C and 4D, respectively. Therefore, in this example, only the video signal A is selected as the NTSC television signal from the buffer 93. It will be output in a static manner. The buffer output is displayed on the NTSC television monitor 11.

For example, as described above, when an HDTV system signal is used as the high definition video signal and an NTSC system signal is used as the standard definition video signal, the HDTV system signal is more vertical than the NTSC system signal. Also, since the number of pixels in the horizontal direction is about twice, it is possible to transmit four types of video signals (A to D) to one channel without image deterioration.

As an example of the high definition transmission medium 7,
A medium such as a wireless line, an optical fiber network, or a satellite broadcasting line can be considered.

[0022]

As described above, according to the present invention, four kinds of standard definition video signals are multiplexed into a signal of one channel, converted into a high definition signal and transmitted. 1 of
Since the signal is extracted and returned to a standard definition signal so that it can be monitored by a general receiver, there is an effect that a high definition signal can be enjoyed without deterioration of image quality.

[Brief description of drawings]

FIG. 1 is a system block diagram of an embodiment of the present invention.

FIG. 2 is a diagram showing a specific example of an image processing unit 5 in the block of FIG.

FIG. 3 is an operation waveform diagram of each part showing the operation of the block of FIG.

4 is a diagram showing a specific example of a video selection unit 9 and a definition conversion unit 10 in the block of FIG.

[Explanation of symbols]

 1 to 4 camera 5 image processing unit 6 transmission device 7 transmission medium 8 reception device 9 image selection unit 10 definition conversion unit 11 monitor

Claims (3)

[Claims] 1. A multiplexing means for multiplexing video signals from a plurality of television image pickup devices into a signal of one channel, and a high definition video signal converting means for converting the multiplexed output into a high definition video signal. And a transmission means for transmitting the converted output, the video signal processing device. 2. A selection means for receiving a transmission signal from the transmission means and selecting one of a plurality of video signals, and a standard definition for converting the selected output into a video signal of a standard definition and outputting it. The video signal processing apparatus according to claim 1, further comprising video signal converting means and display means for displaying the converted output on a screen. 3. At the time of the multiplexing, specific information for specifying each of the plurality of video signals is inserted corresponding to each video signal, and the selecting means selects a video signal corresponding to the external specific information. The video signal processing device according to claim 2, wherein