JPH06225229A - Highly precise information reproduction circuit for video equipment - Google Patents

Abstract

PURPOSE:To prevent omission of a bit and the deterioration of bit gradation at the time of reproducing highly precise information by enlarging an amplitude of auxiliary information so as to decode it at the time of reproducing highly precise information, and executing a processing for reducing the amplitude of highly precise information in the process of decoding or after decoding terminates. CONSTITUTION:A system is controlled in such a way that the output of an a-fold coefficient unit 110 (a>1) is selected in a switch 111, and the output of an analog/digital A/D converter 102 is supplied to a D.C component removal circuit 106 in the period of a vertical non-picture part where auxiliary information are arranged. The output of the D.C removal circuit 106 is decoded in an auxiliary information decoding part 130, and highly precise information which is decoded is dropped so that a signal gain becomes equal to that of a central video period by a 1/a-fold coefficient unit 130. Then, highly precise information with satisfactory reproduction precision can be obtained from the lea-fold coefficient unit 113. Thus, the deterioration of bit precision, which occurs in a highly precise information reproduction circuit, is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video device for receiving a television signal composed of video information and auxiliary information for high definition, and more particularly to a high definition information reproducing circuit for reproducing high definition information from auxiliary information. Regarding

[0002]

2. Description of the Related Art Currently, NTS is used as a terrestrial broadcasting system.
C, PAL, SECAM, etc. The ratio of the horizontal and vertical (aspect ratio) of the screen to be transmitted in all of these broadcasting systems
Are the same, and an aspect ratio of 4: 3 is adopted. However, in recent years, there has been a demand for a wider screen. To achieve widening using the current terrestrial broadcasting, it is desirable to maintain compatibility with conventional receivers. Therefore, when widening, widening is performed within the existing broadcasting system standard with an aspect ratio of 4: 3. There is a need.

Under these circumstances, as a widening technique developed, there are a side panel type, a letterbox type, and a method based on an eclectic type of these. The side panel format is a wide screen (generally, the aspect ratio is 16: 9).
4) is cut out and transmitted by the current broadcasting system, and the remaining portion is frequency-multiplexed and transmitted at the end of the image or the image portion that is overscanned. In addition, the letterbox format is a 4: 3 screen that fits a 16: 9 image into the full screen and fills the remaining part of the 4: 3 screen with auxiliary information for high definition of a 16: 9 image. The format is such that they are arranged and transmitted. The present invention particularly relates to a wide aspect compatible television receiver or a video tape recorder that receives a wide aspect television signal transmitted in a letterbox format or an eclectic format, and a wide broadcast system using the letterbox format thereafter. The outline will be described.

First, the principle of the letterbox wide broadcast transmission system will be described with reference to FIG. In NTSC, each frame is composed of 525 scanning lines, and the effective screen consists of 480 scanning lines. FIG. 11A shows an image having an aspect ratio of 16: 9. First, this image is divided into a low frequency component that can be transmitted even in the current system and a high frequency component that provides a finer resolution. The low-frequency component is converted into 360 scanning lines so that distortion does not occur even with current TVs with an aspect ratio of 4: 3. In addition, information restriction / encoding processing is performed so that high frequency components can be contained within the remaining 120 scanning lines. Then, these high band components and low band components are arranged as shown in FIG. By performing such a scanning number conversion process, it is possible to fit a screen with an aspect ratio of 16: 9 into a screen with an aspect ratio of 4: 3, and even a current 4: 3 television has no distortion 16: 9.
You can see 9 pictures. However, high-definition information is displayed at the upper end and the lower end of the screen. Aspect ratio 16:
The 9-wide wide-aspect compatible image receiver performs a completely reverse process to reproduce a 16: 9 wide screen as shown in FIG. The above is the principle of the wide aspect / letterbox type broadcasting system. Next, the outline of the configurations of these transmitters and receivers will be described.

First, a television signal having an aspect ratio of 16: 9 is generated using a broadcasting system having an aspect ratio of 4: 3. The principle of the transmitting side will be described with reference to FIG. The signal format of the signal source is 525 lines / 60Hz / 1: 1 (aspect ratio 16: 9). The R, G, B signals which are the signal source outputs are supplied to the matrix 50 via the input terminals 47, 48 and 49,
Convert to Y, I, Q signals. The Y, I and Q signals are converted into digital signals by analog-digital A / D converters 44, 46 and 45. The Y, I, and Q signals are stored in 360 scanning lines in the vertical center of the screen, so the number of scanning lines is 480 to 3
Converts to 60 lines, but since it does not generate aliasing components at that time, 360 by vertical low pass filter LPF52
The vertical high frequency components above (TVL / PH) are deleted. And
The number of scanning lines from 480 to 3 by the scanning line number conversion circuit 53
Convert to 360 which is / 4. Y compressed to 360 lines,
The I and Q signals are supplied to the interlace conversion circuit 54, and the odd lines of the odd fields and the even lines of the even fields are selected, and each line is expanded twice to be converted into the interlace format signal. I, Q
Is supplied to the NTS encoding circuit 55, and Y is supplied to one end of the switch 70. The output of the analog-to-digital A / D converter 44 for Y is supplied to the 1/60 second delay circuit 66 and the adder 67 to obtain the average within the frame, and the switch 68 is turned on / off at 60 Hz to generate a 30 Hz image signal. To do. This signal has a sequential transmission rate, is converted into an interlaced transmission rate by the 1/2 rate down circuit 69, and is supplied to the vertical high-pass filter HPF57 and the vertical low-pass filter LPF62. Vertical high-pass filter HPF57 360 ~
The vertical high frequency component of 480 (TVL / PH) is extracted. This vertical high frequency component is frequency-shifted in the vertical direction by the frequency shift circuit 58, and the vertical high frequency component is D. C. ~ 120 (TVL / P
H). This signal is converted to the scanning line number conversion circuit 59.
Input to and convert the number of scanning lines. Here, the original image is composed of 480 scan lines.
Convert to 20 lines. Next, the horizontal high-pass filter LP is used for the vertical high-frequency components with 120 scanning lines per frame.
Supply it to F60 and delete the components above 2 (MHz).

The output of the 1/2 rate down circuit 69 is also supplied to the vertical low-pass filter LPF62, where D. C. Up to 120 (TVL / PH) vertical low frequency components are extracted. The vertical low frequency component is converted by the scanning line number conversion circuit 63 from 480 scanning lines to 120 scanning lines.
Then, by the horizontal bandpass filter BPF64 4.
Extract the horizontal high frequency components from 2 to 6.0 (MHz). By the way, since this frequency component is outside the frequency band of the NTSC Y signal, it cannot be transmitted as it is. Therefore, the frequency shift circuit 64 multiplies the sine wave of 8 (MHz) and frequency-shifts the above component to 2 to 3.8 (MHz) for transmission. From the horizontal low-pass filter LPF60, C. A vertical high frequency component whose band is limited to ˜2 (MHz) is output, and a horizontal high frequency component whose frequency is shifted to 2 (MHz) to 3.8 (MHz) is added by an adder 61, and a line rearrangement circuit 56 Supply to.

The line rearrangement circuit 56 rearranges the vertical and horizontal high-frequency components line by line so that the vertical and horizontal high frequency components are arranged in the upper and lower portions of the screen where there is no image. The auxiliary information signal obtained by the above processing is information that changes in the plus direction and the minus direction around zero for high definition. This is suitable for transmitting this in the non-image part of the image. C. An offset must be added and the D. C. Add an offset.

The video portion of the Y signal output from the interlace conversion circuit 54 and the auxiliary information output from the adder 72 are appropriately switched by the switch 70, and auxiliary information for high definition is arranged above and below the video portion. To switch 70
Control. Then, the Y, I, and Q that have been processed for such a wide aspect conversion are processed by the NTSC encoder.
The signal is supplied to 55 and encoded into a signal of NTSC standard 525/60/2: 1, further converted into an analog signal by a digital-analog D / A converter, and a video signal corresponding to a wide aspect is obtained at the output terminal 41. A simple display on a display device having an aspect ratio of 4: 3 is as shown in FIG. still,
High-definition information is displayed in the upper non-image area and the lower non-image area.

Next, the principle on the side of the receiver that supports an aspect ratio of 16: 9 will be described with reference to FIG. First, a video signal compatible with a wide aspect is supplied to the clamp circuit 101. Since the video signal is normally transmitted through a condenser coupling, D.I. C. The ingredients are lost. In the clamp circuit 101, the pedestal level is set to a predetermined level, and the D. C. Playing ingredients. Then, the output of the clamp circuit 101 is supplied to the analog-digital A / D converter 102 to be converted into a digital signal, and this signal is further supplied to the switch 112. Switch 112
Only the video portion in the center of the screen is supplied to the NTSC decoder 81, and the signal of the non-image portion in which the auxiliary information is arranged is the D.D.
C. The removal circuit 106 is controlled so as to be supplied. The NTSC decoder 81 reproduces Y, I, and Q signals of the image portion, and supplies them to the progressive scan conversion circuit 82. The video in the vertical center of the screen is an interlaced format signal with 360 scanning lines per frame, so Y, I, and Q
The signal is supplied to the progressive scan conversion circuit 82 and converted into a sequential format. This conversion is performed by detecting motion, performing scanning line interpolation within a field in the moving image portion, and performing scanning line interpolation within a frame such that two consecutive fields are superimposed in the still image portion. Y, I, and Q converted into the progressive scan conversion are set to 1 by the scanning line number conversion circuit 83.
Converted from 360 scan lines to 480 scan lines per frame.

On the other hand, the auxiliary information of the upper and lower non-image areas obtained by controlling the switch 112 is D. C. D. of the non-image part added on the transmitting side by the component removing circuit 106. C. Remove the ingredients. In the above clamp circuit 101, D. C. Although the component reproduction is performed and the signal waveform is reproduced faithfully, the D.D. C. The offset level is not reproduced at the absolute level. This is the reference level of the clamp and the D. C. This is because the offset levels do not match. This D. C. In the component removing circuit 106, the D. C. The clamp operation is performed based on the offset value. As an actual method, the transmitting side does not add auxiliary information of high-definition information to a part of the non-image part.
C. We will provide an offset-only area. Then, on the receiving side, the D. C. The signal level in the offset period is obtained, and the detected level is subtracted from the auxiliary information for a predetermined period to add the added D. C. The offset can be completely removed. D. C. The output of the component removal circuit 106 is supplied to the line rearrangement circuit 85 and processed in the reverse of the transmission side to rearrange the signals, and the horizontal low-pass filter LPF87 and the horizontal high-pass filter HPF90 separate the horizontal and vertical components. To do. High-resolution information in the vertical direction can be obtained from the horizontal low-pass filter LPF87,
In this state, the number of scanning lines per frame is 120, and the scanning line number conversion circuit 88 converts the information of 120 scanning lines per frame into 480 lines. Vertical high-definition information is C. Since the frequency is shifted to ~ 120 (TVL / PH), this is frequency-shifted by the frequency shift circuit 89 and returned to the components of 360 to 480 (TVL / PH). In addition, horizontal high-pass filter HPF90 outputs high-definition information in the horizontal direction, and frequency shift circuit 91, horizontal band-pass filter
It is the original frequency band by the filter BPF92
Return to horizontal high-definition information of 4.2 to 6 (MHz). Then, similar to the vertical high-definition information, the scanning line number conversion circuit 93 performs scanning line interpolation on 120 pieces of information per frame, and scanning line 480
Convert to a book. The horizontal high-definition information and the vertical high-definition information are added by the adder 94. These high definition information is 30Hz
Since it is a signal of 2 times, it is rate-up processing by the double rate-up circuit 95, 1/60 second delay circuit 96, switch 97
Control is performed to interpolate in the time direction and convert to a 60 Hz signal. Then, this high-definition information is supplied to the adder 86,
The Y signal of the scanning line number conversion circuit 83 is added.

The I and Q signals obtained from the scanning line number conversion circuit and the Y signal obtained from the adder 86 are converted into analog signals by a digital-analog D / A converter, respectively, and further supplied to the inverse matrix circuit 84 to be supplied to R. , G, B signals. The transmission and reproduction of a wide screen having an aspect ratio of 16: 9 is performed by the processing on the transmitter side and the receiver side described above.

By the way, reproduction of high-definition information on the receiver side can be obtained by performing digital processing such as interpolation, filtering, and frequency shift on the auxiliary information arranged in the non-image area. In these processes, operations such as addition, subtraction, multiplication and division are performed, and the output bit width must be increased with respect to the input bit width in order to ensure accuracy in performing the operation. For example, to add any two data of 8-bit width, the number of bits of the adder output must be expanded to 9 bits. If the number of bits of the output signal of the arithmetic unit is expanded to a bit width capable of expressing the value that the output can take each time the arithmetic operation is repeated, the accuracy does not deteriorate. However, in reality, due to hardware restrictions, the lower bits are truncated while sacrificing some accuracy, thus preventing an increase in hardware. As a result, information loss such as bit loss and bit gray level drop occurs. When reproducing the high-definition information on the receiver side, the auxiliary information arranged in the non-image area is obtained by performing multi-stage arithmetic processing, which causes a significant decrease in accuracy. Originally, the signal level of this auxiliary information is considerably smaller than the level of the central video signal on average, so that when high-definition information reproduction is performed, the bit drop and the bit gradation drop as described above occur. The accuracy of reproduction of high-definition information is severely deteriorated.

[0013]

Since the auxiliary information arranged in the non-picture part is smaller than the amplitude level of the video part on average, when reproducing high definition information from the auxiliary information, bit loss and bit gradation are caused. As a result, the precision of high-definition information reproduction is reduced.

Therefore, in the present invention, it is possible to improve the reproduction quality of high-definition information due to the above-mentioned bit loss and bit gradation deterioration without increasing the number of bits of the analog-digital A / D converter. A high-definition information reproducing circuit of a video device capable of reproducing high-definition information.

[0015]

[Means for Solving the Problems] Structure 1; auxiliary information obtained by arranging video information in a part of an image and encoding high-definition information for making the video information high-definition by a predetermined method. In a high-definition information reproducing circuit of a video device for receiving an analog television signal arranged in a portion other than the video information in the image, an analog-digital conversion means for converting the analog television signal into a digital signal, and the video. In the information period and the auxiliary information period, switching means for changing the output destination of the analog-digital conversion means, level conversion means for increasing the amplitude of the digital signal of the auxiliary information selected by the switching means, The output of the level conversion means is used as an input, and the decoding processing according to a predetermined method is performed. Reproducing the high-definition information, and consists of an auxiliary information decoding means for outputting aligned signals and gain of time of the video information by reducing the amplitude of the high-definition information in after playing process or reproduction.

Configuration 2; The video information in the image is supplemented by arranging the video information in a part of the image and encoding the high-definition information for high-definition of the video information by a predetermined method. In a high-definition information reproducing circuit of a video device which receives an analog television signal arranged in a portion other than information, level conversion means for increasing the amplitude of the television signal, and the television signal during the period of the video information. First switching means for selecting and selecting the output of the level converting means during the period of the auxiliary information; analog-digital converting means for converting the output of the first switching means into a digital signal; A second switching means for changing the output destination of the analog-digital means in the period and the period of the auxiliary information; The high-definition information is reproduced by subjecting the digital signal of the auxiliary information selected by the second switching means to the decoding process of a predetermined method, and the amplitude of the high-definition information is reduced after the reproduction process or after the reproduction. Then, it is composed of an auxiliary decoding means for outputting the signal in the period of the video information in the same gain.

[0017]

With the above structure, when reproducing the high-definition information, the amplitude of the auxiliary information is increased and decoded, and the amplitude of the high-definition information is decreased during the decoding process or after the decoding is completed.

With the above operation, the deterioration of the bit precision, which has occurred in the high-definition information reproducing circuit, can be reduced, and the number of bits for analog-digital A / D conversion is not increased even from auxiliary information having a small amplitude. High-definition information can be reproduced well. With the above configuration 2, the influence of the quantization error that occurs during analog-digital A / D conversion can be further reduced.

[0019]

FIG. 1 shows a first embodiment of the present invention. Compared to the conventional circuit shown in FIG. C. Removal circuit
Between the 106 and the line rearrangement circuit 85, the a-multiplication coefficient unit 114 is
The difference is that a 1 / a multiplication coefficient unit 113 is inserted between the switch 97 and the adder 86. That is, before reproducing the high-definition information, the auxiliary information is once multiplied by a (a> 1) to increase the signal level once and then reproduced, and the reproduced high-definition information is multiplied by 1 / a to reproduce the reproduced signal. I'll bring back the level of. By performing such a process, the error due to the truncation can be made relatively small compared to the level of the reproduced high-definition information, so that the accuracy deterioration can be improved. In the present embodiment, for the sake of convenience of explanation, the 1 / a multiplication coefficient unit 113 is described as being arranged at the subsequent stage of the auxiliary information decoding circuit 130, but it is included inside the auxiliary information decoding circuit 130. I don't care. For example, the effect of the present invention can be obtained even if the frequency shifters 89 and 91 are located after the frequency shifters 89 and 91.

By the way, the amplitude of the auxiliary information arranged in the non-picture area is considerably smaller on average than the amplitude of the central video signal as described above. Therefore, a quantization error that occurs during analog-digital A / D conversion leads to a reduction in reproduction accuracy. In the first embodiment, the auxiliary information decoding circuit
Although the accuracy degradation that occurs in 130 is improved, the quantization error that occurs during analog-digital A / D conversion is also enlarged a times, so the deterioration of the high-definition information decoding image quality caused by the quantization error cannot be improved. .

FIG. 2 shows a second embodiment of the present invention. In addition to the effect obtained in the first embodiment, it is possible to further improve the image quality deterioration of the auxiliary information decoding due to the quantization error as described above. The second embodiment will be described below. First, a 16: 9 wide aspect compatible television signal is supplied to the first clamp circuit 101 and the second clamp circuit 101.
To the clamp circuit 120 of. The first clamp circuit is a D.D. C. The main purpose is to reproduce the component, and its output is supplied to one end of the switch 111. Also,
The second clamp circuit 120 mainly performs a clamping operation in the auxiliary information period which is the non-image part, and the operation is D.D. of the auxiliary information in the non-image part added on the transmitting side. C. The offset level is set approximately at the center of the input dynamic range of the analog-digital A / D converter 102.
The output of the second clamp circuit 120 is supplied to the other end of the switch 111 after having its amplitude increased by the a-multiplication coefficient unit 110. The switches 111 and 112 are controlled at the same timing, the switch 111 selects the output of the first clamp circuit 101 during the central video period, and the switch 112 selects the output of the analog-digital A / D converter 102. NT
It is controlled so that it is supplied to the SC decoding circuit 81. Also,
During the upper and lower non-image areas where auxiliary information is placed, the switch
111 selects the output of the a-multiplier unit 110 (a> 1), and the switch 112 switches the output of the analog-digital A / D converter 102 to the D.D. C. The component removing circuit 106 is controlled so as to be supplied. D. C. The output of the removing circuit 106 is decoded by the auxiliary information decoding unit 130, and the decoded high definition information is dropped by the 1 / a multiplication coefficient unit 113 so that the signal gain becomes equal to the signal gain in the central video period. Good high-definition information with good reproduction accuracy can be obtained from the 1 / a multiplication coefficient unit 113. Switching may be provided between the television input terminal 80 and the first and second clamp circuits 101 and 120. With this switch, the television signal is input to the first clamp circuit 101 during the video period, and the television signal is input to the second clamp circuit during the auxiliary information period which is a non-image portion. Further, the 1 / a multiplication coefficient unit 113 is the auxiliary information decoding circuit as in the first embodiment.
It can be included inside the 130. For example, it may be located after the frequency shifting means 89, 91.

The circuit other than the circuit described above is the same as the conventional example, but will be described again below. Switch 112
Only the video part in the center of the screen is supplied by the NTSC decoder 81,
Further, the signal of the non-image part in which the auxiliary information is arranged is D. C. The removal circuit 106 is controlled so as to be supplied. The NTSC decoder 81 reproduces Y, I, and Q signals of the image portion, and supplies them to the progressive scan conversion circuit 82. Since the image at the center in the vertical direction of the screen is a signal in an interlaced format with 360 scanning lines per frame, Y, I, and Q signals are supplied to the progressive scan conversion circuit 82 to be converted into a sequential format. This conversion is performed by detecting motion, performing scanning line interpolation within a field in the moving image portion, and performing scanning line interpolation within a frame such that two consecutive fields are superimposed in the still image portion. The progressive scan conversion Y, I and Q are converted from 360 scanning lines to 480 scanning lines per frame by the scanning line number converting circuit 83. On the other hand, the auxiliary information of the upper and lower non-image areas obtained by the control of the switch 112 is D. C. D. of the non-image part added on the transmitting side by the component removing circuit 106. C. Remove the ingredients.
In the above clamp circuit 101, D. C. Although the component reproduction is performed and the signal waveform is reproduced faithfully, the D.D. C. The offset level is not reproduced at the absolute level. This is the reference level of the clamp and the D. C. This is because the offset levels do not match. This D. C. In the component removing circuit 106, the D.
C. The clamp operation is performed based on the offset value. As an actual method, the transmitting side does not add auxiliary information of high-definition information to a part of the non-image part. C. We will provide an offset-only area. Then, on the receiving side, the D. C. By obtaining the signal level in the offset period and subtracting the detected level from the auxiliary information for a predetermined period,
Added D. C. The offset can be completely removed. D. C. The output of the component removal circuit 106 is supplied to the line rearrangement circuit 85 and processed in the reverse of the transmission side to rearrange the signals, and the horizontal low-pass filter LPF87 and the horizontal high-pass filter HPF90 separate the horizontal and vertical components. . High-definition information in the vertical direction can be obtained from the horizontal low-pass filter LPF87, but in this state, the number of scanning lines per frame is 120, and the scanning line number conversion circuit 88 allows 120 scanning lines per frame. Convert information to 480 lines. Vertical high-definition information is C. ~ 12
Since it is frequency-shifted to 0 (TVL / PH), this is frequency-shifted by the frequency shift circuit 89, and 360 to 480
Return to the (TVL / PH) component. In addition, horizontal high-pass filter HPF90 outputs high-definition information in the horizontal direction,
Frequency shift circuit 91, horizontal bandpass filter BP
The original frequency band is 4.2 to 6 (MHz) depending on F92
Return to horizontal high definition information. Then, similarly to the vertical high-definition information, the scanning line number conversion circuit 93 converts 120 lines of information per frame into 480 scanning lines. The horizontal high-definition information and the vertical high-definition information are added by the adder 94. Since these high-definition information is a 30 Hz signal, the double rate up circuit 95 performs a rate up process, and the 1/60 second delay circuit 96 and the switch 97 control the time direction interpolation process to obtain a 60 Hz signal. Convert.

FIG. 3 shows a third embodiment of the present invention. This configuration differs from the second embodiment in that the clamp circuit 120 is omitted. D. of the non-image part added on the transmitting side C. The a-multiplication coefficient unit 11 is adjusted so that the offset level is in the center of the dynamic range of the A / D converter 102.
At 0. C. Add. With such a configuration, the dynamic range of the A / D converter 102 can be effectively used and the effect of the present invention can be obtained. As in the second embodiment, a switch that switches between the video period and the auxiliary information period may be provided in the next stage of the clamp circuit 101.

According to the present invention, as shown in the above-mentioned three embodiments, the signal gain of the auxiliary information is increased, and the gain is decreased after the decoding is completed or in the middle of the decoding, so that good high-definition information reproduction is performed. To do. Also,
In the second and third embodiments, the signal level of the auxiliary information is increased in the analog signal state, and the analog-digital A /
It is good to perform analog-digital A / D conversion by effectively using the dynamic range of the D converter, perform high-definition information decoding processing with a large signal gain, and lower the gain after or during the decoding. It is intended to reproduce such high-definition information. Therefore,
In implementing the present invention, various application configurations are conceivable, not limited to the above three examples. Further, the present invention can be implemented not only in a wide aspect receiver, but also in a wide aspect compatible video equipment such as a wide aspect decoder and a wide aspect compatible video tape recorder. Further, the wide aspect ratio is not limited to 16: 9. It should be noted that in constructing the present invention, it is possible to configure a part using a DSP (digital signal processor).

[0025]

As described above in detail, when reproducing the high-definition information contained in the auxiliary information arranged in the upper and lower non-picture portions of the wide aspect broadcast, the amplitude of the auxiliary information is temporarily increased and the decoding is completed. By performing a process of reducing the amplitude afterward or in the process of decoding, bit loss and bit gradation drop that occur during high-definition information reproduction are reduced, and high-definition information can be reproduced well. Also,
When the amplitude of the auxiliary information is increased, if the amplitude is increased in the state of the analog signal, the dynamic range of the analog-digital A / D converter can be effectively used to perform the analog-digital A / D conversion, and thus the quantization error. As a result, the high-definition information can be reproduced even better.

[Brief description of drawings]

FIG. 1 is a configuration block diagram of a wide aspect compatible television receiver showing a first embodiment of the present invention.

FIG. 2 is a configuration block diagram of a wide aspect-compatible television receiver showing a second embodiment of the present invention.

FIG. 3 is a configuration block diagram of a wide aspect compatible television receiver showing a third embodiment of the present invention.

FIG. 4 is a principle diagram of wide aspect broadcasting.

FIG. 5 is a configuration block diagram of a wide aspect broadcast device.

FIG. 6 is an image diagram when a wide aspect broadcast is projected on a television receiver having an aspect ratio of 4: 3.

FIG. 7 is a configuration block diagram of a conventional wide aspect-compatible television receiver.

[Explanation of symbols]

81 ... NTSC decoding, 82 ... sequential scanning conversion circuit, 83 ... scanning line number conversion circuit, 84 ... inverse matrix circuit, 85 ... line rearrangement circuit, 86 ... adder, 87 ... horizontal low-pass filter, 88 ... scanning line number conversion Circuit, 89 ... Frequency shift circuit, 90 ... Horizontal high pass filter HPF, 91 ... Frequency shift circuit, 92 ... Horizontal band pass filter BPF, 93 ... Scan line number conversion circuit, 94 ... Adder, 95 ... Double rate up Circuit, 96 ... 1/60 second delay circuit, 97 ... switch, 101 ... clamp circuit, 102 ... analog-digital A / D converter, 103, 104, 105 ... digital-analog D / A converter, 106 ... D. C. Removal circuit, 110 ... a multiplier, 111 ... Switch, 112 ... Switch, 113 ... 1 / a multiplier, 120 ... Clamp circuit, 130 ... Auxiliary information decoding circuit.

Claims (2)

[Claims] 1. The video information in the image, wherein auxiliary information obtained by arranging the video information in a part of the image and encoding the high-definition information for enhancing the definition of the video information by a predetermined method. In a video device for receiving an analog television signal arranged in a portion other than the above, in the analog-digital conversion means for converting the analog television signal into a digital signal, and in the period of the video information and the auxiliary information period, the analog A switching means for changing the output destination of the digital converting means, a level converting means for increasing the amplitude of the digital signal of the auxiliary information selected by the switching means, and an output of the level converting means as an input, which is predetermined. The high-definition information is reproduced by performing the decoding process of High-definition information reproducing circuit of a video apparatus, characterized by comprising an auxiliary information decoding means for outputting aligned signals and gain of time of the video information by reducing the amplitude of the high-definition information in after playing. 2. The video information in the image, wherein the video information is arranged in a part of the image, and the auxiliary information obtained by encoding the high-definition information for high definition of the video information by a predetermined method is added. In a video device for receiving an analog television signal arranged in a portion other than the above, a level conversion means for increasing the amplitude of the television signal, and selecting the television signal in the period of the video information, the period of the auxiliary information Then, a first switching means for selecting the output of the level converting means, an analog-digital converting means for converting the output of the first switching means into a digital signal, a period of the video information and a period of the auxiliary information. Then, second switching means for changing the output destination of the analog-digital means, and the second switching means The high-definition information is reproduced by subjecting the selected digital signal of the auxiliary information to a decoding process according to a predetermined method, and the amplitude of the high-definition information is reduced after the reproduction process or after the reproduction. A high-definition information reproducing circuit for a video equipment, comprising: an auxiliary decoding means for outputting a signal in the information period and a gain in a uniform manner.