JPH07193794A - Television signal receiver - Google Patents

Abstract

PURPOSE:To obtain a reproduced picture prevented from the deterioration of picture quality by providing this television (TV) signal receiver with a judging means for judging a case that the synthesis of a reinforcing signal included in an input signal is not correctly conducted. CONSTITUTION:An identification (ID) signal judging/controlling means 102 checks the property of an input signal inputted to an input signal terminal 101 and judges whether the input signal is a reproduced signal from a home VTR or not. At the time of judging that the input signal is not a reproduced signal from the home VTR, the means 102 controls an EDTV signal processing means 103 so as to coduct EDTV signal processing using a normal reinforcing signal. In this case, an EDTV signal processed by changing both of horizontal frequency and vertical frequency to high bands is sent to a picture tube 104. The means 102 controls the means 103 so as to conducted EDTV signal processing without using the reinforcing signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver capable of receiving second generation EDTV broadcasting.

[0002]

2. Description of the Related Art Currently, standardization of a second-generation EDTV aiming at widening and high image quality is in progress. In this second-generation EDTV, widening is performed in a letterbox format, and for high image quality, horizontal high range (HH signal), vertical high range (VH signal), vertical-time high range (VT signal).
Will be reinforced.

In the letterbox format, a wide signal is vertically compressed to fit within the current aspect. At this time, the VH and VT signals are multiplexed on the non-image portions generated above and below.

The VT signal is a reinforcement signal for improving progressive scanning on the receiver side, and the VH signal is a reinforcement signal in the vertical high range lost due to vertical compression associated with the letterbox format.
Only stationary parts are reinforced.

It has been considered to modulate and multiplex these color enhancement sub-carriers (fsc) in order to make them less visible as interference in the non-picture part of the current receiver.

The second-generation EDTV described above is described, for example, in Technical Report VOL. 17,
NO. 65 broadcasting system (October 28, 1993) 19-2
Page 4, Ishikura et al. “LD (vertical-time reinforcement) / VH (vertical reinforcement)
Prototype of signal multiplexing letterbox EDTV ”.

A method for identifying these supplemental signals of the second generation EDTV broadcast on the receiver side is described in, for example, Technical Report of the Television Society of Japan, VOL. 17, NO. 6
5 broadcasting system (October 28, 1993), pp. 43-48, Fukuroku et al., "EDTV-II identification control signal".

Further, as a conventional technique relating to the second generation EDTV, there is JP-A-4-157887.

[0009]

In the above-mentioned prior art, when a signal is recorded once in a recording / reproducing apparatus such as a home-use VTR and then the reproduced signal is displayed on a television receiver, the image quality is improved by a reinforcement signal. However, there is a problem that the quality of the reproduced image is deteriorated.

This deterioration will be described below. In the second-generation EDTV broadcasting system, since the color subcarrier is modulated by the reinforcement signal, the spectrum of the reinforcement signal exists in the same high frequency band of the video signal as the color signal band. When the signal of the second generation EDTV broadcasting system including this reinforcement signal is recorded on a home VTR, Yokoyama et al., "Introduction to Home VTR", (Corona, October 15, 1981), 28-3
As described on page 2, after being separated into a color signal and a luminance signal, the color signal is converted into a low frequency and the luminance signal is converted into a high frequency and recorded. A comb filter is usually used to separate the color signal and the luminance signal. The comb filter separates a color signal and a luminance signal by adding and subtracting signals at positions separated by one line. Therefore, when a signal according to the second-generation EDTV broadcasting system is recorded using a domestic VTR, the reinforcement signal is recorded as a color signal that is calculated by a comb filter. Then, information different from the original reinforcement signal is recorded in the VTR by the calculation by the comb filter. Further, when the signal is reproduced from the VTR, the signal is reproduced by being jittered due to the expansion of the tape or the like, so that the reinforcing signal portion is also reproduced by being jittered. Therefore, if the signal reproduced from this VTR is used to be projected on the second generation EDTV receiver, a signal different from the original reinforcement signal is used to synthesize it with the main screen, resulting in higher image quality. Not only that, but the reproduced image is rather deteriorated.

An object of the present invention is to solve the above-mentioned problems and to record and reproduce on a home VTR a second generation EDTV.
Another object of the present invention is to provide a second-generation EDTV receiver capable of obtaining a reproduced image without deterioration in image quality even if a signal according to a broadcasting system is used.

[0012]

In order to achieve the above-mentioned object, according to the present invention, a reinforcement signal extracting means for extracting a reinforcement signal multiplexed into an input signal, and an output of the reinforcement signal extracting means are combined with an input signal. A television characterized by comprising reinforcement signal synthesizing means and determination means for determining when reinforcement signals included in an input signal are not correctly synthesized, and controlling the reinforcement signal synthesizing means by the output of the determination means. A receiver was installed.

[0013]

The reinforcing signal extracting means extracts the reinforcing signal multiplexed with the input signal from the input signal. The reinforcement signal synthesizing means synthesizes the output of the reinforcement signal extracting means with the input signal.
Further, the determining means determines, based on the state of the input signal, the case where the reinforcement signal is not correctly synthesized. When it is determined by the determination output of the determination means that the reinforcement signals are not correctly synthesized, the reinforcement signal synthesis means is controlled so that only the input signal is synthesized without using the reinforcement signal. Output as means. On the other hand, when it is determined by the determination output of the determination means that the reinforcement signal is correctly combined, the reinforcement signal combining means is controlled to use the reinforcement signal, so that the normal second-generation EDTV has a high level. It is possible to obtain a picture quality screen.

[0014]

EXAMPLES Examples of the present invention will be described below.

FIG. 1 is a block diagram of an embodiment according to the present invention. In FIG. 1, 101 is an input signal terminal,
Reference numeral 102 is an identification signal determination control means, 103 is an EDTV signal processing means, and 104 is a picture tube. Next, the operation of FIG. 1 will be described. The identification signal determination control means 102 checks the nature of the input signal input to the input signal terminal 101 and determines whether the input signal is a reproduction signal from a home VTR. If it is determined that the input signal is not the reproduction signal from the home VTR, the identification signal determination control means 102.
Controls the EDTV signal processing means 103 to perform EDTV signal processing using a normal reinforcement signal. Therefore, in this case, since the EDTV signal whose horizontal frequency band is increased and vertical frequency band is increased is sent to the picture tube 104, it is possible to view a high quality image. on the other hand,
When it is determined that the input signal is the reproduction signal from the home VTR, the identification signal determination control unit 102 causes the EDTV.
The signal processing means 103 controls so as to perform EDTV signal processing without using the reinforcement signal. In this case, the EDTV in which the horizontal frequency band and the vertical frequency band are not increased
Since the signal is sent to the picture tube 104, it is possible to view the unobstructed video from the augmentation signal.

Further, the identification signal judgment control means 102
In addition to the determination as to whether or not the signal is a reproduction signal from the home VTR, the identification signal in the input signal input to the input signal terminal 101 is examined to determine whether or not the signal is a second generation EDTV signal. If it is determined that the input signal is the second generation EDTV signal, the picture tube 104 is controlled independently of the determination as to whether the input signal is the reproduction signal from the home VTR.
Enlarges the received signal to fill the wide screen and displays it. On the other hand, when it is determined that the input signal is not the second generation EDTV signal, the picture tube 104 is controlled so that the received signal is not enlarged and displayed. Thus, by using the configuration of FIG. 1, it is possible to always view the output image of the television receiver with the optimum image quality according to the input signal and the optimum display size.

Regarding the second-generation EDTV signal format and transmission / reception device, Technical Report V of the Television Society of Japan.
OL. 17, NO. 65 broadcasting system (October 2, 1993)
8th) Pages 19-24, Ishikura et al. "LD (Vertical-time reinforcement) /
VH (Vertical Reinforcement) Signal Multiplexing Letterbox EDTV Prototype "and is omitted here.

FIG. 2 is a block diagram showing FIG. 1 in more detail. In FIG. 2, means having the same functions as those in FIG. 1 are given the same circuit numbers as in FIG. In FIG. 2, 201 is a reinforcement signal reproducing means, 202 is a switching means, and 203 is a synthesizing means. The operation of FIG. 2 is the same as that of FIG. 1, and the identification signal determination control means 102 checks the property of the input signal input to the input signal terminal 101 and determines whether the input signal is a reproduction signal from a home VTR. judge. If the identification signal determination control means 102 determines that the input signal is not the reproduction signal from the home VTR, the identification signal determination control means 102 outputs the reinforcement signal reproduction means 201 as the switching means 202 output. The switching means 202 is controlled so that the EDTV signal processing means 10
3 performs the EDTV signal processing using the normal reinforcement signal. Therefore, in this case, the synthesizing means 203
Since the output of the reinforcing signal reproducing means 201 and the input signal on the input terminal 101 are combined, the EDTV signal whose horizontal frequency band and vertical frequency band have been widened is received by the picture tube 104.
It is possible to project high-quality images to be sent to.

On the other hand, when the identification signal determination control means 102 determines that the input signal is the reproduction signal from the home VTR, the identification signal determination control means 102 outputs 0 as the switching means 202 output. So that the switching means 2
02 so that the EDTV signal processing means 103 performs the EDTV signal processing without using the reinforcement signal. In this case, the output of the synthesizing unit 203 sends the EDTV signal, which does not synthesize the reinforcement signal, to the picture tube 104, so that an image without interference from the reinforcement signal can be displayed.

In addition to the determination as to whether or not the signal is a reproduction signal from a home VTR, the identification signal determination control means 102 checks the identification signal of the input signals input to the input signal terminal 101, and the input signal is It is determined whether the signal is a second generation EDTV signal. If the identification signal determination control unit 102 determines that the input signal is the second generation EDTV signal, the identification signal determination control unit 102 receives the image so that the output of the combining unit 203 is enlarged to fill the wide screen. Tube 10
Control 4 On the other hand, when the identification signal determination control means 102 determines that the input signal is not the second generation EDTV signal, the identification signal determination control means 102 causes the output of the synthesizing means 203 not to enlarge the wide screen. 104
To control. Therefore, when the second generation EDTV broadcast in which the video information is transmitted in a wide aspect ratio of 16: 9 is received, the display image is automatically enlarged and displayed on the wide screen, and otherwise, the wide screen is displayed. Since the display is not enlarged, it is possible to always display an optimum size.

As described above, by using the configuration shown in FIG. 2, the output image of the television receiver can be always displayed with the optimum image quality according to the input signal, and the display output of the optimum display size can be performed. Become.

A more detailed embodiment according to the present invention will be described with reference to FIG. In FIG. 3, 101 is an input signal terminal, 102 is an identification signal determination control means, 104 is a picture tube, 301 is a switching means, and 302 is a three-dimensional Y / C /
HH separation means, 303 is motion detection means, 304 is demodulation means, 305 is switching means, 306 is addition means, 307
Are color demodulation means, 308 and 309 are low-pass frequency pass filter means, 310 and 311 are scanning line number conversion means, 312 is fsc demodulation means, 313 is horizontal expansion means, 314 is high-pass frequency pass filter means, and 315 is low. Band-pass filter means, 316 motion adaptive scanning line interpolation means, 317 filter means, 318 motion detection means, 319 LD /
VH separation demodulation means, 320 is filter means, 321, 3
22 is a switching means, 323, 324, 325 is an adding means, 326 is a scanning line number converting means, 327 is an adding means, 3
28 is a scanning line number conversion means, 329 is a vertical frequency shift means, 330 is a matrix means, 331 is a display control means,
Reference numeral 332 is a switching means.

The operation of this embodiment will be described below. First, the signal processing of the main image section will be described. 3D Y / C / H
The H separation means 302 performs motion adaptive Y / C / HH separation based on the motion detection signal from the motion detection means 303,
A luminance signal, a color signal, and a horizontal frequency high-frequency signal are separated and extracted from the main image portion signal of the input signal. After this, the demodulation means 304
Demodulates a horizontal frequency high frequency signal into a baseband signal. Then, the adding means 306 adds the output of the demodulating means 304 which is the output of the switching means 305 and the Y signal of the output of the three-dimensional Y / C / HH separating means 302 to reinforce the horizontal frequency high frequency component. Get the luminance signal.

On the other hand, the color demodulation means 307 is a three-dimensional Y / C.
The C signal output of the / HH separating means 302 is converted into two types of baseband color difference signals (I signal and Q signal). Then, with respect to each color difference signal, after removing harmonics by the low-pass frequency pass filter means 308 and 309, the number of scanning lines is converted by the number of scanning lines conversion means 310 and 311.
A progressive scan signal of 480 lph is obtained.

Next, the signal processing of the non-picture portion will be described. The switching circuit 301 is a non-image part period fsc demodulation means 3
12 is connected. The fsc demodulation means 312 demodulates the non-picture part signal. After that, the horizontal expansion means 313 expands the fsc demodulation means 312 on the original time axis. Then L
The D / VH separation demodulation means 319, based on the motion detection signal output from the motion detection means 318, performs the motion adaptive LD / VH.
Separate demodulation is performed to obtain an LD signal and a VH signal. The low-pass filter means 315 extracts the low-pass component of the main picture portion signal. Then, the filter means 317 and 320 perform SSKF (Sym) on the low frequency component of the luminance signal and the LD signal.
metric short kernelfilte
Inverse conversion of r) is performed. Then, the adding means 325 adds the respective signals. Further, the adding means 323 adds the luminance signal and the LD to form a main scanning line. by the way,
Since there is no reinforcement signal for the high frequency component of the luminance signal, the conventional motion adaptive scanning line interpolation is performed by the motion adaptive scanning line interpolation means 316. Field interpolation is performed in the still region, and line interpolation is performed in the moving image region. Scan line conversion means 3
Reference numeral 26 converts the 360 lph sequential scanning signal output from the adding means 323 and 324 into a 480 lph wide sequential scanning signal.

On the other hand, the scanning line conversion means 328 uses the LD / V
Scan line conversion and vertical shift processing are performed from the VH signal which is another separated output of the H separation demodulation means 319. This allows
A luminance signal having a vertical high frequency component is reproduced. Then, the addition unit 327 adds the output of the scanning line conversion unit 326 and the output of the vertical shift unit 329, whereby a signal in which the vertical component is reinforced can be obtained.

The matrix means 330 has a luminance signal, an I signal, which is a progressive scanning signal of 480 lph described above,
After converting the Q signal into an RGB signal, it is sent to the picture tube 104 to display a wide-range high-quality image. This allows the recipient to view the high quality video.

The switching means 305, 321, 322 are
When it is determined that the output of the identification signal determination control unit 102 is not the signal from the home VTR, the input on the side other than 0 is used, and the normal image quality enhancement processing by the reinforcement signal is achieved. On the other hand, when it is determined that the output of the identification signal determination control means 102 is the signal from the home VTR, the input of 0 is used. Then, since the influence of the reinforcement signal is eliminated, the image quality is not deteriorated when the home VTR is received. Further, when it is determined that the output of the identification signal determination control means 102 is not the signal from the home VTR, the switching means 332 receives the output of the high frequency pass filter and reproduces the reinforcement signal described above. However, if it is determined that the signal is from the household VTR, the switching unit 332 does not use the output of the high-frequency pass filter 314, but uses the output of the adding unit 306 as it is. By doing so, the interpolated signal in the entire band can be produced.

Further, the display control means 331 and the picture tube 1
When the output of the identification signal determination control unit 102 detects the second generation EDTV, the display unit 04 enlarges the display and can output a powerful image that effectively uses the wide screen. On the other hand, the output of the identification signal determination control means 102 is
When the second-generation EDTV is not detected, it is possible to display without expanding and display and output the display information of the normal current broadcast without any loss. Incidentally, supplementing the control method of the enlarged display of FIG. 3, the display control in the horizontal direction of the screen is performed by the display control means 331 to enlarge the display, and the display control in the vertical direction of the screen is performed in the vertical direction of the picture tube 104. This is realized by changing the deflection amount of the deflection circuit. The control method of the enlarged display is not necessarily performed as shown in FIG. 3, and the display control in the screen horizontal direction may be performed by the control of the horizontal deflection circuit or the display control in the screen vertical direction may be performed by the signal processing.

Here, an example of the identification signal will be described.
FIG. 4 is an example of the identification signal. The detailed contents of this identification signal are described in Technical Report VOL. 17,
NO. 65 broadcasting system (October 28, 1993) 43-4
P.8, "Study of EDTV-II Discrimination Control Signals" by Fukinuki et al. Here, a part related to the present invention will be described.

The identification signals are the video signals 22H and 285H.
Is superimposed on. After the color burst signal, there is a confirmation signal called a reference signal. This reference signal is a 2-bit digital signal of which the first is 1 and the second is 0. After this reference signal, there is a 2-bit letterbox ON / OFF signal. And after this,
After the 1-bit signal indicating 0 continues, information indicating the actual control content of the identification signal is added. The information indicating the control content of the identification signal is not a baseband signal, but a signal obtained by modulating the color subcarrier with the information indicating the control content. Then, after this, a confirmation function signal for confirming that this line is a line on which an identification signal is put is added. The point to be noted here is that the control content of the identification signal is not a baseband digital signal but a signal obtained by modulating a color subcarrier.

When recording a video signal in a home VTR, a comb filter is used to separate it into a color signal and a luminance signal, and the color signal is recorded in the low frequency range and the luminance signal is recorded in the high frequency range. . The comb filter used in a home VTR has, for example, a configuration shown in FIG. In this figure, 501 is an input terminal, 502 is a 1H delay means, 503.
Is a subtracting means, 504 is a coefficient means, 505 is a band pass filter, 506 is a color signal output terminal, 507 is subtracting means, 5
Reference numeral 08 is a luminance signal output terminal. In the NTSC system, the chrominance signal is inverted between lines and the luminance signal is in-phase between lines. Therefore, the signal obtained by delaying the input signal by the 1H delay means 502 and the input signal on the input terminal 501 are subtracted by the subtraction means 503.
Thus, when the subtraction is performed, a color signal having double the amplitude can be obtained at the output of the subtraction unit 503. Then, this color signal is multiplied by a coefficient of 0.5 times by the coefficient means 504 and passed through the band pass filter 505, whereby a color signal of 1 time can be obtained at the color signal output terminal 506. Then, the obtained color signal is subtracted from the original input signal by the subtracting means 5.
If the luminance signal is subtracted by 07, the luminance signal is output to the luminance signal output terminal 50.
8 can be obtained.

Then, what happens when the identification signal described above is recorded in a home VTR will be described below.
This will be described with reference to waveform diagrams. FIG. 6 shows a signal waveform of 21H, which is 1H before the identification signal, and a signal waveform of 22H where the identification signal exists. When this signal is input for recording in a home VTR, it is separated into a luminance signal and a chrominance signal by a comb filter. At this time, as shown in FIG. 6A, the color burst signal exists in 21H, but the identification signal does not exist. Therefore, if the comb filter process is performed between the signals of 21H and 22H, the color signal is generated. With respect to, the level of the color burst part does not change, but the level of the part where the content of the identification control exists is halved. This waveform has the waveform shown in FIG. 6C and is recorded as a 22H color signal.

On the other hand, for the luminance signal, the subtraction means 507 of FIG. 5 is used to convert the input signal into the color signal output terminal 506.
Since it is obtained by subtracting the upper color signal, the waveform is a waveform obtained by subtracting the waveform of FIG. 6C from the waveform of FIG. 6B (FIG. 6D). This waveform is recorded as a luminance signal of 22H. After this, this home VTR
When the signal recorded from is reproduced, the color signal is as shown in FIG.
(C), the waveform of FIG. 6 (d) is obtained as the luminance signal,
Finally, a signal obtained by adding the luminance signal and the color signal is output from the output terminal of the home VTR. This output waveform is shown in FIG. Here, comparing the identification signal before being recorded in the home VTR with the identification signal reproduced from the home VTR, as can be seen from FIG. 6, the signal reproduced from the home VTR is a color burst signal. The ratio between the level and the level of the signal indicating the content of the identification control is the VT for home use.
Different from the one before recording in R. By utilizing this, it is possible to determine that the signal is from the home VTR.

FIG. 7 shows an example of the configuration of the identification signal determination control means for determining the signal from the home VTR according to the present invention.

In FIG. 7, 702 is vertical sync separation means, 703 is vertical capture means, 704 is horizontal sync separation means, 705 is horizontal capture means, 706 is reference signal detection means, 707 is identification signal level detection means, 7
Reference numeral 08 is an integrating means, 709 is a burst signal level detecting means, 710 is an integrating means, 711 is a comparing means, and 712 is an identification signal determination control signal. The vertical sync separating means 702 separates the vertical sync signal from the input signal. The vertical fetching means 703 outputs a signal indicating the fetching position of 22H based on the vertical synchronizing signal output from the vertical synchronizing separating means 702. Further, the horizontal sync separation means 704 separates the horizontal sync signal from the input signal. Horizontal capturing means 705
Outputs an output indicating a reference signal detection position with reference to the horizontal synchronization signal output from the horizontal synchronization separating means 704. The reference signal detection means 706 determines the signal at the reference signal position of 22H, and determines that the signal at that position is a signal having a first 1 and a signal having a second 0. If it is determined that the reference signal exists, a gate signal indicating the position where the identification signal exists is generated and sent to the identification signal level detecting means 707.
The identification signal level detecting means 707 detects the maximum level of the color subcarrier component while the gate signal from the reference signal detecting means 706 is open. And the integrating means 7
08, the maximum value of the identification signal level detecting means 707 is integrated a predetermined number of times. On the other hand, the burst level detecting means 709 detects the maximum level of the burst signal of the input signal. Then, the level of the burst signal is obtained by integrating a predetermined number of times by the integrating means 710. Here, if the signal is not from the home VTR, the level of the identification signal does not change, so the burst signal level and the identification signal level are equal. On the contrary, when the signal from the home VTR is received, the identification signal of this signal is affected by the comb filter operation, and the amplitude level of the identification signal becomes half of the burst signal level. Therefore, by looking at the output of the comparing means 712 in FIG. 7 and detecting whether the output of the level detecting means 707 of the identification signal is the same as or half of the output of the burst signal level detecting means 709, a VTR for home use can be obtained. It is possible to determine whether or not it is a reproduction output.

FIG. 8 shows the configuration of the identification signal determination control means for determining the signal from the home VTR according to another embodiment of the present invention.

In FIG. 8, 802 is vertical sync separation means, 803 is vertical capture means, 804 is horizontal sync separation means, 805 is horizontal capture means, 806 is reference signal detection means, 807 is identification signal level detection means, 8
08 is an integrating means, 809 is a burst signal level detecting means, 810 is an integrating means, 811 is a comparing means, 812 is an identification signal determination control signal, 813 is a band pass filter means,
Reference numeral 814 is a detection means, 815 is a low-pass filter means, 8
Reference numeral 16 is a color burst extraction means, and 817 is a color subcarrier generation means. The vertical sync separating means 802 separates the vertical sync signal from the input signal. Vertical capture means 803
Outputs with reference to the vertical synchronizing signal which is the output of the vertical synchronizing separating means 802, which indicates the capture position of 22H.
Further, the horizontal sync separation means 804 separates the horizontal sync signal from the input signal. The horizontal fetching means 805 outputs an output indicating a reference signal detection position with reference to the horizontal synchronizing signal output from the horizontal synchronizing separating means 804.
The reference signal detection unit 806 determines the signal at the reference signal position of 22H, and determines that the signal at that position is a signal having a first 1 and a signal having a second 0. on the other hand,
The band pass filter means 813 extracts a color signal component from the input signal on the input terminal 801. Then, the color burst extraction means 816 uses the band pass filter means 81.
Of the three outputs, only the period in which the color burst exists is extracted. The color subcarrier generating means 817 reproduces continuous color subcarriers with reference to the output of the color burst extracting means 816. Then, the detecting means 814 outputs the color subcarrier generating means 8 to the output of the bandpass filter means 813.
Multiply 17 outputs. Then, the low-pass filter means 8
Reference numeral 15 extracts a low frequency component from the output of the detecting means 814. In this way, the low pass filter means 81
A baseband color signal is obtained at the five outputs. If the reference signal detection means 806 determines that the reference signal is present in the input signal, the identification signal detection means 807 detects the average value level while the gate signal from the reference signal detection means 806 is open. To do. Then, the integrating means 808 integrates the average value of the identification signal detecting means 807 a predetermined number of times. On the other hand, the burst level detecting means 809 detects the average value level of the color burst signal of the input signal. Then, the integrating means 81
The level of the burst signal is obtained by integrating a predetermined number of times with 0. Here, when the signal is not from the home VTR, there is no change in the level of the identification signal with respect to the color burst signal, so the color burst signal level and the identification signal level are equal. On the contrary, when the signal from the home VTR is received, the identification signal of this signal is affected by the comb filter operation, and the amplitude level of the identification signal becomes half of the color burst signal level. Therefore, by looking at the comparison means output 812 in FIG. 8, it is detected whether the level detection output of the identification signal is the same as or half of the level of the color burst signal to determine whether it is a home VTR reproduction output. Can be determined. As described above, the configuration of FIG. 8 determines whether the identification signal modulating the color subcarrier is once demodulated and returned to the baseband signal, and whether it is a home VTR reproduction output.
For this reason, the level of the color subcarrier signal is detected at a lower frequency than in the configuration of FIG. 7, and the determination becomes more stable.

As described above, by using these identification signal determination control means, when it is determined that the signal is from the home VTR, the EDTV processing by the reinforcement signal is controlled so as not to be performed. It is possible to eliminate the image quality deterioration at the time of receiving the VTR signal.

Further, in the configuration of FIG. 3, the switching means 32
1 and 322 are formed, they do not necessarily have to be at this position. For example, as shown in FIG. 9, switching means 901
The same effect as that of FIG.

By the way, in the above description, a home VTR
When it is determined that the signal is from, the influence of the reinforcement signal is eliminated by switching the reinforcement signal to 0.
As described below, the level of the reinforcement signal may be reduced. FIG. 12 shows this configuration. FIG. 12 has almost the same configuration as FIG. A different point is that an amplitude control means 1201 is configured instead of the switching means 202. When the identification signal determination means 102 determines that the VTR is for home use, the amplitude of the amplitude control means 1201 is controlled to be small. Even in this case, the same effect as that of FIG. 2 can be obtained.

Similarly, the configuration of FIG. 10 can be considered corresponding to FIG. In FIG. 10, the switching means 3 in FIG.
05, the amplitude control means 1001 also corresponds to the switching means 321, 322, and the amplitude control means 1002,
1003 corresponds. With this configuration, when the identification signal determination control means 102 is used to determine that the VTR is for home use, the amplitude control means 1001, 1002, 1003.
Is controlled to reduce the amplitude.

Further similarly, FIG. 11 corresponding to FIG.
The following configurations are possible. In FIG. 11, the amplitude control means 1101 corresponds to the switching means 305 in FIG. 9, and the amplitude control means 1102 corresponds to the switching means 901. With this configuration, when the identification signal determination control unit 102 is used to determine that the VTR is for home use, the amplitude control units 1101 and 1102 may be controlled to reduce the amplitude.

Finally, the identification signal determination control means 102 will be described in more detail.

FIG. 13 is a block diagram of the identification determination control means 102. In FIG. 13, 1301 is an input terminal, 1302 is a low-pass filter, 1303 is a band-pass filter, 1304 is a detection means, 1305 is a low-pass filter, 1306 is a color burst extraction means, 1307.
Is a color subcarrier generating means, 1308 is an abnormal signal detecting means for detecting an abnormal signal of a home VTR, 1309 is a decoding means for detecting the signals of bits 1 to 5 of the identification signal, 1310 is a slice level setting means, 1311
Is a decoding means for detecting the signals of bits 6 to 23 of the identification signal, 1312 is an error correction means, 1313 is an interface means, and 1314 is an output terminal. Next, the operation of FIG. 13 will be described. Input terminal 1301
A video signal is input to. Low pass filter 1302
Removes high frequency components of the input signal. Then, the period in which the signal modulating the color subcarrier is present in the identification signal is removed, and the signal waveform in the period from bits 1 to 5 remains. The output of this low pass filter 1302 is H
There are bits that represent levels and bits that represent L levels. Therefore, the H level can be detected by obtaining the maximum value in the period of bits 1 to 5, and the L level can be detected by obtaining the minimum value. This H
An intermediate value between H level and L level is obtained from the level and L level values, and the threshold value for binarizing the values of bits 1 to 5 is set. By performing binary discrimination using the threshold value with the decoder 1309, stable binarization is possible regardless of the signal level of the identification signal. Decoder 1309
The output binarizes the signal from bits 1 to 5,
It is sent to the interface means 1313.

On the other hand, the band pass filter means 1303 is
The color signal band is extracted from the video signal on the input terminal 1301. The color burst extraction means 1306 extracts a color burst signal from the output of the bandpass filter 1303.
Then, the color subcarrier generation means 1307 generates a color subcarrier synchronized with the phase of the color burst signal from the color burst extraction means 1306. The detection means 1304 synchronously detects the output of the bandpass filter 1303 using the output of the color subcarrier generation means 1307. Then, the low pass filter means 1305 removes the harmonic component from the output of the detection means 1304. Then, the baseband identification signal is obtained at the output of the low-pass filter means 1305. The output of this low pass filter means 1305 is still a multi-valued signal. Therefore, the decoding means 1311 binarizes using the output of the low-pass filter means 1305. by the way,
With respect to the output of the low-pass filter means 1305, the H level is +1 and the L level is -1 with 0 as a reference, so 0 may be used as the identification value for binarization. Then, the error detection / correction means 1312 performs error detection and correction on the output of the decoding means 1311 and sends the corrected signal to the interface means 1313.

The abnormal signal detecting means 1308 obtains the level ratio between the color burst signal and the part of the identification signal where the color subcarrier is modulated, from the output of the low pass filter 1305. Then, as described above, the reproduced signal from the home VTR and the non-reproduced signal are distinguished from each other based on this level ratio, and the determination result is determined by the interface means 1313.
Send to. The interface means collects the information from the above means and sends it to the system.

The further identification signal determination control means 102 will be described in detail.

FIG. 14 is a block diagram of the identification determination control means 102. In FIG. 14, reference numeral 1401 is an input terminal, 1402 is a low-pass filter, 1403 is a band-pass filter, 1404 is a detection means, 1405 is a low-pass filter, 1406 is a color burst extraction means, and 1407.
Is a color subcarrier generating means, 1408 is an abnormal signal detecting means for detecting an abnormal signal of a domestic VTR, 1409 is a decoding means for detecting the signals of bits 1 to 5 of the identification signal, 1410 is a slice level setting means, 1411
Is a decoding means for detecting the signals of bits 6 to 23 of the identification signal, 1412 is an error correction means, 1413 is an interface means, 1414 is an output terminal, 1415 is a switching means, 1416 is a delay means, and 1417 is a noise removal means. , 1418 are memory means. Next, FIG.
The operation of will be described. A video signal is input to the input terminal 1401. The switching means 1415 inputs the input terminal 1401 for the period from bits 1 to 5 of the identification signal.
From the delay means 1416 are selectively output for the period from bits 6 to 23. The low pass filter 1402 removes the high band component of the input signal during the period from bits 1 to 5 of the identification signal. Then, the signal waveform in the period in which the signal modulating the color subcarrier in the identification signal exists is removed,
The signal waveform of the period of bits 1 to 5 remains. The noise removing unit 1417 removes noise from the output of the low-pass filter unit 1402 while using the memory unit 1418.
The output of the noise removing unit 1417 has a bit indicating the H level and a bit indicating the L level. Therefore,
The H level can be detected by obtaining the maximum value in the period of bits 1 to 5, and the L level can be detected by obtaining the minimum value. The intermediate value between the H level and the L level is obtained from the values of the H level and the L level,
This is used as a threshold value for binarizing the values of bits 1 to 5. The decoder 14 performs binary discrimination using this threshold value.
By performing the processing in 09, stable binarization is possible regardless of the signal level of the identification signal. The output of the decoder 1409 binarizes the signal of bits 1 to 5 and sends it to the interface means 1413.

On the other hand, the bandpass filter means 1403 is
The color signal band is extracted from the video signal on the input terminal 1401. The color burst extraction means 1406 extracts a color burst signal from the output of the bandpass filter 1403.
Then, the color subcarrier generation means 1407 generates a color subcarrier synchronized with the phase of the color burst signal from the color burst extraction means 1406. The detection means 1404 synchronously detects the output of the bandpass filter 1403 using the output of the color subcarrier generation means 1407. Then, the low pass filter means 1405 removes harmonic components from the output of the detection means 1404. Then, the baseband identification signal is obtained at the output of the low-pass filter means 1405. The output of this low pass filter means 1405 is still a multi-valued signal. Switching means 1415 uses bit 6 of the identification signal.
The output of the low-pass filter means 1405 is output for the period in which the signals from 1 to 23 exist.

Here, the reason why the delay means 1416 is provided will be briefly described. The delay unit 1416 uses the noise removing unit 1417 later to remove noise.
This is because a time interval is set so that the information in the period from bits 1 to 5 and the information in the period from bits 6 to 23 do not overlap. That is, until the identification signal is finally decoded, the boundary between the period of bits 1 to 5 and the signal of bits 6 to 23 is unknown. Therefore, it is necessary to capture in advance the period before and after the period considered to be the bit 1 to 5 and the period before and after the period considered to be the period from the bit 6 to 23. In this way, to switch the switching means 1415 and perform noise removal by multiplexing these periods,
The bits 1 to 5 and the bits 6 and after need to take in the preceding and following periods to some extent, and the delay means 1416 is required.

The low pass filter means 1402 removes the high frequency component of the identification signal in the period from bits 6 to 23. Here, the identification signals of bits 6 to 23 are baseband. The noise removing means 1417 uses the memory means 1418 while using the low-pass filter means 1402.
Remove noise from the output. Then, the decoding means 1411 binarizes using the output of the noise removing means 1417. By the way, the output of the noise removing unit 1417 has an H level of +1 and an L level of -1 with 0 as a reference, so 0 may be used as an identification value for binarization. Then, the error detection / correction means 1412 is the decoding means 141.
Error detection and correction are performed on one output, and the corrected signal is sent to the interface means 1413. Here, the control of the noise removing unit 1417 will be briefly supplemented. Since the identification signal is provided with the field number and the frame number as information, the error correction code added by including this information also differs from field to field and from frame to frame. Since the field number and frame number are each represented by 1 bit, these numbers are 1 in 4 fields.
Go around. Noise removing means 1417 including error correction code
It is necessary to observe this sequence in order to operate correctly. If no error correction code is used,
You don't have to follow this sequence.

The abnormal signal detecting means 1408 obtains the level ratio between the color burst signal and the part of the identification signal where the color subcarrier is modulated, from the output of the low pass filter 1405. Then, as described above, the reproduction signal from the home VTR and the non-reproduction signal are distinguished from each other based on this level ratio, and the result of this determination is determined by the interface means 1413.
Send to. The interface means collects the information from the above means and sends it to the system.

[0054]

As described above, since the signal from the recording / reproducing apparatus such as a home VTR can be automatically discriminated by implementing the present invention, the deterioration of the image quality due to the reinforcement signal in this case is eliminated. There is an effect that a generation EDTV receiver can be realized. Further, when the signal is not from a recording / reproducing device such as a home VTR, a high-quality image can be achieved by a normal reinforcement signal. Therefore, a second-generation EDTV reception that always obtains an optimum image quality according to the property of the input signal. There is an effect that the machine can be realized.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a television signal receiving apparatus of the present invention.

FIG. 2 is a block diagram showing an embodiment of another television signal receiving apparatus according to the present invention.

FIG. 3 is a block diagram showing an embodiment of another television signal receiving apparatus according to the present invention.

FIG. 4 is a waveform diagram for explaining an identification signal.

FIG. 5 is a block diagram for explaining an example of the configuration of a comb filter.

FIG. 6 is a waveform diagram for explaining a change in an identification signal waveform when recorded on a home VTR.

FIG. 7 is a block diagram showing an embodiment of an identification signal determination control means.

FIG. 8 is a block diagram showing another embodiment of the identification signal determination control means.

FIG. 9 is a block diagram showing another embodiment of the television signal receiving apparatus according to the present invention.

FIG. 10 is a block diagram showing another embodiment of the television signal receiving apparatus according to the present invention.

FIG. 11 is a block diagram showing another embodiment of the television signal receiving apparatus according to the present invention.

FIG. 12 is a block diagram showing another embodiment of the television signal receiving apparatus according to the present invention.

FIG. 13 is a more detailed block diagram of the identification signal determination control means according to the present invention.

FIG. 14 is a more detailed block diagram of another identification signal determination control means according to the present invention.

[Explanation of symbols]

 101 ... Input signal terminal 102 ... Identification signal determination control means 103 ... EDTV signal processing means 104 ... Picture tube

Front Page Continuation (72) Inventor Tsutomu Noda 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa, Ltd.Hitachi Ltd. Media & Video Research Laboratories (72) Inventor Katsunobu Kimura 292, Yoshida-cho, Totsuka-ku, Yokohama, Kanagawa Hitachi, Ltd. Visual Media Research Center

Claims (8)

[Claims] 1. A television signal receiving apparatus, comprising: a judging means for judging a state of a reinforcement signal multiplexed on an input signal, wherein the contents of the processing are changed by the output of the judging means. 2. A reinforcement signal extracting means for extracting a reinforcement signal multiplexed into an input signal, a reinforcement signal synthesizing means for synthesizing an output of the reinforcement signal extracting means with an input signal, and whether the input signal is a signal from a recording / reproducing apparatus. And a determination means for determining whether or not
A television signal receiving device, characterized in that the reinforcement signal synthesizing means is controlled by the output of the judging means. 3. A reinforcement signal extracting means for extracting a reinforcement signal multiplexed into an input signal, a reinforcement signal synthesizing means for synthesizing the output of the reinforcement signal extracting means with an input signal, and whether the input signal is a signal from a recording / reproducing apparatus. And a determination means for determining whether or not
A television signal receiving apparatus, wherein the level of the reinforcement signal is set to 0 by the output of the determination means. 4. A reinforcement signal extracting means for extracting a reinforcement signal multiplexed with an input signal, a reinforcement signal synthesizing means for synthesizing an output of the reinforcement signal extracting means with an input signal, and whether the input signal is a signal from a recording / reproducing apparatus. And a determination means for determining whether or not
A television signal receiving apparatus, characterized in that the level of the reinforcement signal is reduced by the output of the judging means. 5. A judging means for judging the state of an input signal by calculating the level of an identification signal and the level of a color burst signal. 6. A first means using a setting means for setting a slice level of an input signal and an output of the slice level setting means.
Means for decoding the identification signal in the period, the detecting means for detecting the input signal, the level of the color burst signal superposition period in the output of the detecting means, and the second subcarrier in which the color subcarrier is modulated using the control signal. A judging means for judging a state of an input signal, comprising: an abnormal signal detecting means for detecting an abnormal signal by comparing and calculating a level of an identification signal of a period. 7. A means for determining the state of an input signal, wherein whether or not to magnify and display the output video signal is determined from information of only the first period in the input signal. 8. A television signal receiving apparatus, wherein the judging means according to claim 5, 6, or 7 is used as the judging means according to claim 1, 2, 3, or 4.