JPH08223543A - Television signal processing unit - Google Patents

Abstract

PURPOSE: To prevent production of disturbance noise caused by an identification control signal in a video signal onto a conventional system television receiver by starting the processing from a video signal of a prescribed horizontal line in counted horizontal lines. CONSTITUTION: A synchronizing signal separator section 1 gives a signal Sh resulting from separating a horizontal synchronizing signal Sh and a vertical synchronizing signal Sv from a video signal Vi to a counter 2. The counter 2 counts number of horizontal lines based on the signal Sh and gives a digital count to a video signal processing section 3. In the 2nd generation high definition television system, a video signal, a reinforcement signal and an identification control signal are transmitted. The identification control signal is inserted to a horizontal line of 22H, 285H of a video signal start line of the existing system. The processing section 3 is designed to start processing from 23rd or 286th horizontal line. Thus, the horizontal lines 22nd and 285th with the identification control signal inserted to them are cut off and the signal is not in existence in an output Vo and then production of disturbance is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television signal processing device, and more particularly to a high definition television signal (ED) compatible with a current NTSC television signal.
It relates to video signal processing for TV-II).

[0002]

2. Description of the Related Art Currently, in Japan, NT is the standard method.
As is well known, the first-generation high-definition television broadcasting (EDTV-I to clear vision) compatible with the SC system has been implemented. This high-definition television broadcasting aims to improve the image quality in the NTSC system, which is a standard system.
Main features include conversion to non-interlaced scanning method. In addition, the video aspect ratios are all 4 to 3.

On the other hand, satellite high-definition broadcasting (HD
TV) is in the stage of practical use, but the high-definition broadcast has an image aspect ratio of 16: 9, which is a wide image. Due to the influence of the above-mentioned high-definition broadcasting and the like, in recent years, a widening receiver of 16: 9 has attracted attention. This widening,
The second-generation high-definition television broadcasting (EDTV) is aimed at achieving higher image quality and higher sound quality.
-II) The EDTV-II is the current standard system (NTS
Although it is a system compatible with the C system), it has a wide aspect ratio of 16: 9.

Therefore, in the conventional receiver (4: 3), the ED
Although it is possible to receive a TV-II type signal, as shown in FIG.
B) occurs. Then, in the same EDTV-II system, by using the non-picture part, a supplemental signal such as a vertical frequency high frequency signal (VH) or a vertical-time frequency signal (VT) for improving the image quality of the main picture part is provided. It is supposed to be transmitted. In addition to the above, an "identification control signal" for identifying the EDTV-II system is transmitted. The positions (scanning line numbers) where the identification control signal is superimposed are 22H and 285H which are the uppermost portions of the image area. It should be noted that the reason why this position is adopted is that other horizontal lines within the vertical blanking period have already been used for other purposes, and need to be stored in a VTR or the like.

[0005]

As described above, in the broadcasting signal by the second generation high definition television system (EDTV-II) aiming at realization of widening and high image quality, in addition to the video signal, the reinforcement signal and The identification control signal is transmitted. Among them, the identification control signal is inserted into the horizontal lines of 22H and 285H which are the current standard video signal start lines. Therefore, as a result of starting the video processing from the horizontal lines (22H and 285H) in the receiving device which is premised on the reception of the current standard system with the aspect ratio of 4: 3, the identification control signal component is displayed as noise on the upper part of the screen. The problem occurs. An object of the present invention is to provide a television signal processing device that solves the above problems.

[0006]

SUMMARY OF THE INVENTION According to the present invention, in the required video signal processing such as conversion processing of an interlaced video signal including even fields and odd fields into a non-interlaced video signal, A counter for counting the number of horizontal lines based on a horizontal synchronizing signal separated from the video signal, data relating to the number of horizontal lines from the counter, and the video signal of the interlace system are input, and the video signal of the non-interlace system is input. A video signal processing unit for performing necessary video signal processing such as conversion into a video signal, and the signal processing of the video signal processing unit is performed in each of an even field and an odd field of the number of horizontal lines counted by the counter. Changed to start the signal processing from the video signal of a predetermined horizontal line There is provided a revision signal processor.

[0007]

The counter counts horizontal lines based on the input horizontal synchronizing signal and sends the data to the video processing section. Count data from a counter and a video signal to be processed are input to the video processing unit. The video processing unit starts required video processing from the 23rd line or the 286th line in horizontal line counting by the counter. As a result, the 22nd line and the 285th line are cut.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A television signal processing device according to the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a main part showing an embodiment of a television signal processing device according to the present invention, and FIG. 2 is a block diagram of a main part showing the same or another embodiment. In FIG. 1, Vi is an analog video signal, 1 is a sync signal separating unit that separates a horizontal sync signal Sh and a vertical sync signal Sv from the video signal Vi, and 2 is a horizontal signal based on the horizontal sync signal Sh from the sync signal separating unit 1. A counter for counting lines, 3 is a video signal processing unit for performing a required video signal processing, and Vo is an output video signal after the above processing. In addition, in FIG.
The same components are denoted by the same reference numerals, 11 is an identification unit for identifying whether or not it is an identification control signal, 12 is a horizontal signal that requires signal processing by the video signal processing unit 13 based on the identification result of the identification unit 11. A control unit that controls the video signal processing unit 13 so as to start from the line.

Next, the operation of the present invention will be described with reference to EDTV-II.
Will be described as a target signal. First, FIG. 1 will be described. The sync signal separation unit 1 changes the horizontal sync signal Sh from the video signal Vi.
And the vertical sync signal Sv. Among these, the horizontal synchronizing signal Sh is sent to the counter 2. The counter 2 counts the number of horizontal lines based on the horizontal synchronizing signal Sh and sends the count data to the video signal processing unit 3. Video signal processing unit 3
Is set so that the required processing is started from the 23rd horizontal line or the 286th horizontal line. Thereby, the signal processing is started from the 23rd line or the 286th line by the horizontal line number counting by the counter 1, and the horizontal lines 22 and 2 in which the identification control signal is inserted.
85 lines will be cut and output Vo
Does not appear in.

The processing performed by the video signal processing section 3 is as follows.
Analog to digital conversion (A / D conversion), same A
For example, conversion of an interlaced input video signal after D / D conversion into a non-interlaced video signal and generation of a required blanking signal. The above is the case where the start of the signal processing is fixed, but this may be switched to the conventional processing or the processing according to the present invention depending on the input video signal. FIG. 2 considers this switching. 2 is different from FIG. 1 in that an identification unit 11 and a control unit 12 are provided. The sync signal separation unit 1 and the counter 2 are the same as those in FIG. The count data from the counter 2 and the video signal Vi are input to the identification unit 11, and the horizontal line 22 or 28 of the video signal is input.
It is determined whether the signal on the fifth line is a normal video signal or an identification control signal. The identification signal can be identified because its content is different from that of a normal video signal. For example, all of the same identification control signal or a salient feature portion is prepared in advance as a reference signal (memory or the like), and this is compared with the signal on the 22nd line or the 285th line to determine whether it is a normal video signal,
Alternatively, the identification control signal is identified.

Based on the identification by the identification unit 11, the control unit 12
Controls the video signal processing unit 13 to start the video signal processing from the 22nd line or the 285th line when the signal of the horizontal line 22nd line or the 285th line is a normal video signal, and When the line signal is the identification control signal (EDTV-II), the video processing is started from the 23rd line or the 286th line of the horizontal line as in FIG. As a result, the video information on the 22nd or 285th line at the time of normal broadcasting will not be lost.

[0012]

As described above, according to the present invention, the second-generation high-definition television system in which the current first-generation high-definition television system (EDTV-I) is further upgraded in terms of image quality and aspect ratio, etc. In (EDTV-II), it is possible to prevent the occurrence of interfering noise that the identification control signal included in the video signal of the same system gives to the television receiver of the conventional system. The EDTV-II system has a video aspect ratio of 16: 9 and is wider than the conventional system of 4: 3, but is compatible with the conventional system receiver and can be received. Therefore, according to the present invention, it is possible to receive an EDTV-II signal in a device premised on signal reception of the conventional system without causing any problems.

[Brief description of drawings]

FIG. 1 is a principal block diagram showing an embodiment of a television signal processing device according to the present invention.

FIG. 2 is a block diagram of main parts showing another embodiment of the television signal processing device according to the present invention.

FIG. 3 is an explanatory diagram of a video aspect ratio for understanding the present invention.

[Explanation of symbols]

 1 sync signal separation unit 2 counter 3 video signal processing unit 11 identification unit 12 control unit 13 video signal processing unit Vi input video signal Vo output video signal Sh horizontal sync signal

Claims (4)

[Claims] 1. A horizontal synchronization signal separated from an interlaced video signal in a required video signal processing such as a conversion processing of an interlaced video signal including an even field and an odd field into a non-interlaced video signal. A counter for counting the number of horizontal lines based on the above, the data relating to the number of horizontal lines from the counter, and the video signal of the interlace system are input, and the same video signal is converted into a video signal of the non-interlace system. A video signal processing unit for performing video signal processing, wherein the signal processing of the video signal processing unit is performed from a video signal of a predetermined horizontal line in an even field and an odd field of the number of horizontal lines counted by the counter. A television program characterized by starting processing. Signal processing equipment. 2. The television signal processing apparatus according to claim 1, wherein the processing of the video signal in the video signal processing unit is started on the 23rd horizontal line or the 286th horizontal line. 3. A horizontal synchronizing signal separated from the interlaced video signal in required video signal processing such as conversion processing of an interlaced video signal composed of even fields and odd fields into a non-interlaced video signal. A counter for counting the number of horizontal lines based on the above, the data relating to the number of horizontal lines from the counter, and the video signal of the interlace system are input, and the signals of predetermined horizontal lines in the even field and the odd field are respectively subjected to specific control. An identification unit for identifying whether the signal is a signal or not, a video signal processing unit that receives the interlaced video signal and performs required video signal processing such as conversion of the video signal to a non-interlaced video signal; The video signal processing in the video signal processing unit is based on the identification of the identification unit. A television signal processing device, comprising: a control unit that controls the identification unit and the video signal processing unit so as to start each of the required horizontal lines. 4. The start of processing of the video signal in the video signal processing unit is the 23rd or 286th horizontal line when the identification in the identification unit is a specific control signal, and the horizontal line in the case where the identification is not the specific control signal. 22
The television signal processing apparatus according to claim 3, wherein the television signal processing apparatus is the line 285 or the line 285.