JPH06197320A - Television signal processor - Google Patents

Abstract

(57) [Summary] [Objective] In a television signal processing method called a so-called letter box method, the number of scanning lines of 360 is expanded to 480. [Structure] A video signal composed of 360 scanning lines is output to the line memory 5, and the line memories 5, 6, 7,
Transfer to 8 and 9. Coefficient unit 1 for output of each line memory
The filters 6, 17, 18, 19, 20 are respectively multiplied, and these are added by the adder 21 to form a filter in the vertical axis direction. By stopping the writing of the video signal to the line memory for one horizontal scanning period out of the four horizontal scanning periods, the video signal composed of 360 scanning lines is read over the period of 480 scanning lines. [Effect] The filter in the vertical axis direction can be configured by efficiently using the memory.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention does not change the aspect ratio of an image having an aspect ratio different from the aspect ratio of the image defined by the standard of the transmission method within the same transmission band as the current television broadcasting. The present invention relates to a method and apparatus for processing a television signal that fits in an image frame defined by the above standard and transmits an image having a higher image quality than the current television broadcasting.

[0002]

2. Description of the Related Art Current broadcasting is based on the NTSC [National Television System Committee].
ision System Committee)] scanning line number 52
5 lines, 2: 1 interlace scanning, luminance signal horizontal bandwidth 4.2
Specifications of MHz and aspect ratio 4: 3 (for example, bibliographic broadcasting technology, bibliography, color television, edited by the Japan Broadcasting Corporation,
Japan Broadcast Publishing Association, 1961), but with this background, it is compatible with current television broadcasting, and the television that can receive a video with an aspect ratio of 16: 9 on the receiving side. John signal processing methods have been proposed (for example, Society of Motion Picture and Television Eng.
ineers, 133rd SMPTE Technical Conference, Preprint
No.133-67, "A Decoder for Letter-Box Type Wide As
pect EDTV System ").

The transmitting side converts a television signal having 480 effective scanning lines into 360 scanning lines, and the receiving side converts a television signal having 360 effective scanning lines into 480 scanning lines. Television signal processing methods have been proposed (for example, Technical Report of Television Society VOL.1).
4, NO.28, PP.19-24, May, 1990 "See letterbox wide EDTV encoder / decoder". In the method of converting the number of effective scanning lines from 360 to the number of scanning lines of 480, a scanning line with a signal amplitude of 0 is virtually inserted, and the number of scanning lines is quadrupled to 1440. After the signal having 1440 scanning lines is passed through a low-pass filter (low-pass filter) in the vertical direction, one scanning line is extracted every three lines, so that a television having 480 scanning lines without aliasing distortion. Convert to signal. The present invention particularly relates to this vertical low pass filter (low pass filter).

A conventional example relating to the present invention will be described below with reference to the drawings. (FIG. 3) is a television signal processing device that is compatible with current television broadcasting and can receive a video with an aspect ratio of 16: 9. In this television signal processing device, a video signal having an aspect ratio of 16: 9, which is composed of 360 central scanning lines among 480 effective scanning lines of the television signal, is input from an input terminal 1 and this video signal is output. After being temporarily stored in the field memory 2, it is output from the terminal 3 to the line memory 5 and transferred to the line memories 6, 7, 8, and 9 in order, and each connection terminal 1
0, 11, 12, 13, 14 for the pixel array in the vertical direction on the video screen obtained simultaneously, coefficient units 16, 1
The calculation by 7, 18, 19, 20 and the adder 21 is performed to form a vertical filter. At this time, the coefficient values K ₀ , K ₁ , K ₂ , K ₃ , and K ₄ multiplied by the coefficient units 16, 17, 18, 19, and 20 for each horizontal scanning period are rewritten by the coefficient controller 15.

Further, each time the memory controller 4 reads out the signals corresponding to three scanning lines from the field memory 2, the signals forming the third scanning line are read out twice consecutively to scan three lines. 4 signals that make up a line
Reading is performed over the same time as reading a scan line of a book.
If the scanning lines are sequentially read out from the field memory 2 while repeating such a method, a video signal that requires a vertical scanning period of 360 scanning lines can be used for a vertical scanning period of 480 scanning lines without changing the horizontal scanning period. It can be read by applying. That is, this signal is temporally vertically expanded by 4/3.

FIG. 4 shows how data is read from the field memory 2 by the method described above. The numbers in the figure indicate the numbers for each scanning line. In the example of FIG. 4, the (n-1) th, (n + 2) th, (n + 5) th,
The (n + 8) th scanning line is read twice in a row. In the last state, the pixels on the (n + 5) th, (n + 6) th, (n + 7) th, and (n + 8) th scanning lines are synchronously output to the respective terminals of the column connection of the line memory 2.

[0007]

As described above, in the conventional television signal processing method and processing apparatus, since the signals constituting the same scanning line are read from the field memory twice in succession, the line memories connected in cascade are connected. Of the connection terminals of, one out of four terminals outputs the same data as any of the other three terminals, and the coefficient unit is always 4
One out of four is not used, and one out of four line memories for constructing the filter is wasted.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a television signal processing method and a processing apparatus which are highly efficient in use for a line memory and a circuit connected in cascade.

[0009]

In order to solve the above problems, a television signal transmitting method and a television transmitting apparatus according to the present invention include:
Aspect ratio 16: 9 composed of 360 effective scanning lines
When the signals forming each scanning line are sequentially read from the field memory storing the video signal of, the signals forming the three scanning lines are read, and then the reading for one scanning line is stopped and the signals are connected in cascade. By also stopping the writing to the line memory, a video signal that requires a vertical scanning period of 360 scanning lines is read out by performing a vertical scanning period of 480 scanning lines without changing the horizontal scanning period. Is vertically expanded by 4/3 in the vertical direction.

[0010]

The present invention can be easily performed by the above method.
The number of scan lines can be expanded to 480. Further, as compared with the case of the configuration in the conventional example, even when the same number of line memories are used, it is possible to configure a television signal processing device having a long coefficient that configures a filter, so that it is possible to improve vertical frequency response. it can.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A television signal processing method and processing apparatus according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the television signal processing of the present invention.
Method and processor for television signal processor
The lock diagram is shown. First, the center of 480 effective scanning lines
Aspect ratio of 16:
The video signal 9 is input from the input terminal 1. This video signal
Is temporarily stored in the field memory 2 and then written from the terminal 3.
Output to the line memory 5, and the line memories 6, 7, 8, 9 in order.
Transfer to. Each connection terminal 10, 11, 12, 13, 14
The vertical pixel arrangement on the video screen obtained simultaneously from
On the other hand, the coefficient units 16, 17, 18, 19, 20 and the adders
Perform a calculation by the calculator 21 to construct a vertical filter.
To achieve. At this time, the coefficient units 16, 17,
Value K of the coefficient to be multiplied by 18, 19, 20₀, K₁,
K₂, K₃, K _FourIs rewritten by the coefficient controller 15
It

Further, each time the memory controller 4 reads out signals corresponding to three scanning lines from the field memory 2, the scanning is stopped for one horizontal scanning line period. At the same time, writing to the line memories 5, 6, 7, 8, 9 is stopped. The line memory can usually read the data written in a certain one horizontal scanning period in the next one horizontal scanning period, but in the horizontal scanning period next to the one horizontal scanning period in which the writing is not performed, The same data as the data read one horizontal scanning period before is read. That is, in the horizontal scanning period next to the horizontal scanning period in which writing to the line memory is stopped, the connection terminals 10, 11, 1 are connected.
The same signal as in the horizontal scanning period before that period is repeatedly output to 2, 13, and 14.

By the method described above, the connection terminal 1
The state of the signals read to 0, 11, 12, 13, and 14 will be described with reference to FIG. n, (n + 1), (n +
2) and the like refer to the respective scanning lines, and indicate the number of the scanning line in the field of the television signal. At the beginning of the time axis shown in the figure, the nth
(N-1) th, (n-2) th, (n-3) th,
The signal on the (n-4) th scanning line is synchronized with the terminal 10,
It is shown that the data is output to 11, 12, 13, and 14. The memory control signal has an "H" state and an "L" state. In the "H" state, the line memories 5, 6, 7, 8, which are read from the field memory 2 and connected in cascade,
Stop writing to 9. In the "L" state immediately after the memory control signal is "H", the terminals 10, 11, 1
At the outputs of 2, 13, and 14, the same signal on the scanning line as that obtained when the immediately preceding memory control signal is in the "H" state is obtained in synchronization. This memory control signal is 4
By setting to "H" once in the horizontal scanning period, the time required to read all the data from the field memory 2 is expanded to 4/3.

By repeating the above operation,
If the scanning lines are sequentially read from the field memory 2, the video signal that requires a vertical scanning period of 360 scanning lines can be read over the vertical scanning period of 480 scanning lines without changing the horizontal scanning period. , Which stretches the signal vertically in time.

In the present embodiment, the degree to which the memory control signal is set to the "H" state is set to once in four horizontal scanning periods, but the present invention is not limited to this. For example, once in five horizontal scanning periods. Then, the signal is temporally expanded by 5/4 in the vertical direction.

In this embodiment, the original broadcasting system is the NTSC system, the number of effective scanning lines is 480, and the number of scanning lines of the input video signal is 360. However, the present invention is not limited to this. Further, the number of line memories and the number of coefficient units are set to 5, but this is to simplify the description.
It is not limited to this.

[0018]

As is apparent from the above description, according to the present invention, the NTSC can be used without interference in the existing television receiver.
The 16: 9 video can be received within the performance of the standard, and the dedicated receiver can efficiently scan the number of scanning lines in a broadcasting system that can receive a 16: 9 video with a higher definition aspect ratio. be able to. Further, the frequency response in the vertical direction can be improved as compared with the conventional configuration.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of a television signal processing device of the present invention.

FIG. 2 is a timing diagram showing the operation of the television signal processing method of the present invention.

FIG. 3 is a block diagram showing an example of a conventional television signal processing device.

FIG. 4 is a timing chart showing the operation of a conventional television signal processing method.

[Explanation of symbols]

 1 signal input terminal 2 field memory 3 signal connection terminal 4 memory controller 5, 6, 7, 8, 9 line memory 10, 11, 12, 13, 14 signal connection terminal 15 coefficient controller 16, 17, 18, 19, 20 coefficient device 21 adder 22 signal output terminal

Front page continuation (72) Hideyo Kamihata 1006 Kadoma, Kadoma City, Osaka Prefecture, Matsushita Electric Industrial Co., Ltd. Person Yasuo Yasumoto 1006 Kadoma, Kadoma-shi, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (10)

[Claims] 1. A filter for delaying a television signal by a delay unit connected in cascade for one unit period, multiplying these outputs by a multiplier, and adding them together. A television signal processing method, characterized in that input of a signal to the control unit is controlled so as to be stopped for one unit period every several unit periods. 2. A television signal in which an image having an aspect ratio different from the aspect ratio of the image defined by the standard of the transmission system is fitted in the image frame defined by the standard without changing the aspect ratio. The television signal processing method according to claim 1, wherein the input is an input. 3. The television signal processing method according to claim 1, wherein one unit period is one horizontal scanning period of the television signal. 4. The television signal processing method according to claim 1, wherein the delay means for delaying the signal for one unit period is a line memory. 5. The television signal processing method according to claim 1, wherein the filter is a filter for converting a sampling frequency. 6. The television signal processing method according to claim 1, wherein the filter is a filter for converting the number of scanning lines of the television signal. 7. A plurality of delay units connected in cascade and each delaying a signal by one unit period, a plurality of coefficient multipliers for multiplying outputs of the plurality of delay units by a coefficient, and the plurality of coefficients. A television signal processing device, comprising: an adder for adding outputs of the units; and a control means for stopping the input of the plurality of delay means connected in cascade for one unit period every several unit periods. 8. A television signal in which an image having an aspect ratio different from the aspect ratio of the image defined by the standard of the transmission system is fitted in the image frame defined by the standard without changing the aspect ratio. The television signal processing device according to claim 7, which is an input. 9. The television signal processing device according to claim 7, wherein one unit period is one horizontal scanning period of a television signal. 10. The television signal processing apparatus according to claim 7, wherein the delay means is a line memory.