JPH02250466A - Television receiver and video signal recording reproducing or reproducing device and multiplex signal reproducing device - Google Patents

Abstract

PURPOSE:To reproduce a picture with high quality by deciding an equalizing quantity while using an output signal or an input signal of a waveform equalizing means as a reference signal. CONSTITUTION:A changeover means 103 switches a video detection output from a tuner of a television receiver and a video signal of VTR reproduction and outputs the output to a picture display device 110 via a ghost eliminating device 105. Thus, when a picture is observed by the display device 110, ghost is eliminated. Then it is not required to provide respective ghost elimination devices for each television receiver tuner for the video recording of other program of the VTR and the picture whose ghost is efficiently eliminated is displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a television receiver and a video signal recording/reproducing or reproducing apparatus having a function of removing a voice from a transmitted television signal.

[Conventional technology]

A method for removing interference caused by ghosts in current television broadcast receivers is as described in Japanese Patent Publication No. 62-41394, in which a group of delay elements is set up and a signal delayed by the time corresponding to the ghost is sent from the group of delay elements. It is known that after selection, the amplitude is removed by a gain polarity adjustment circuit that corresponds to the level of the ghost. A known method for measuring ghost delay time is to measure the time between the edge of a vertical sync pulse of a television signal and the edge of a vertical sync pulse caused by a ghost, as described in Japanese Patent Publication No. 61-60658. ing.

In addition, studies are underway to transmit the signals necessary for accurately detecting the delay time and amplitude of ghosts from broadcasting stations, and the idea is to insert a reference signal for ghost canceller control within the vertical retrace period of a normal video signal. Regarding, October 1987
This is shown in Nikkei Electronics, published on May 19th, pages 213 to 225, ``Broadcasting by inserting reference signal for ghost canceller control into television signal''.

[Problem to be solved by the invention]

The above-mentioned conventional technology uses a ghost cancellation reference signal (hereinafter referred to as OCR) for removing and eliminating ghosts in television receivers.
(abbreviated as "signal"), but V'l is especially useful when used in combination with a VTR, etc. that receives, records, and reproduces television signals.
No consideration was given to the connection operation between the television receiver and VTR when recording and playing back programs using 'H', which could lead to malfunctions in the handling of ghost cancellation reference signals during VTR recording and ghost removal equipment during VTR playback. There were issues such as gender.

An object of the present invention is to efficiently record OCR signals in VTR recording and reproduction and to remove ghosts during reproduction.

Another object of the present invention is to provide a V'l'R that efficiently records OCR signals.

Still another object of the present invention is to provide a VTR text multiplex signal reproducing apparatus for recording and reproducing text multiplex signals.

[Means to solve the problem]

In order to achieve the above purpose, the television receiver KV'
A switching means having an input for l'R recording and reproduction and a signal processing means provided in front of the ghost removal device are provided, a means for recording a GCR signal of a television signal is provided in a VTR, and a switching means is provided in the VTR reproduction. VTR (1
111 and recorded on the VTR, the ghost removal device is operated based on the 9OCR signal. A signal processing means is provided in front of the ghost removal device to properly detect the OCR signal recorded on the VTR, thereby stabilizing the operation of the ghost removal device.

In order to achieve the above object, a VTR is provided with a separation control means to record the OCR signal as a luminance signal when recording the OCR signal.

In addition, in order to achieve the above-mentioned other object, the text multiplex reproduction device is provided with a switching means having an input for VTR recording and reproduction, and the VTR is provided with means for recording a text multiplex signal of a television signal, In V'l'R reproduction, the switching means is set to the VTR side to reproduce the character multiplex signal recorded in V'l'H.

[Effect]

The switching means switches between the video detection output from the tuner of the television receiver and the video output of VTR playback, and outputs the same to the image display device via the ghost removal device.
Since ghosts can be removed when images are viewed by a display device, ghost-free images can be efficiently displayed without requiring a ghost removal device for each television receiving tuner in a VTR reverse program brass picture.

The signal processing means absorbs the OCR signal and the video signal recorded on the V'J'H by operating the ghost removal device with reference to the synchronization signal of the video signal, and the gap caused by switching the head of the VTR. Therefore, the ghost removal device can operate stably.

Since the separation control means can record the OCR signal as a luminance signal, the OCR by the luminance signal color signal separation circuit of the VTR can be recorded.
Waveform deformation of the signal can be removed, making the operation of the ghost removal device stable and highly accurate.

The switching means of the text multiplex reproduction device can switch between the detection output from the tuner of the television receiver and the V'l'R reproduction output and input it to the text multiplex signal processing device, so that the signal can be transmitted by television broadcasting. In addition to teletext information, information once recorded on V'l'R can also be recorded and reproduced.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. 10
1 is an antenna, 102 is a chainer, 103 is a switching circuit,
104 is a signal processing circuit, 105 is a ghost removal circuit, 1
06 is a waveform equalization circuit, 107 is a detection control circuit, 108 is a timing circuit, 109 is a video signal processing circuit, 110 is a display device, 111 is a video signal input terminal, and the above constitutes a television receiver. There is. 121 is an antenna,
122 is a tuner, 125 is a switching circuit, 124 is an input terminal, 125 is a luminance color separation circuit, 126 is a luminance signal recording processing circuit, 127 is a color signal recording processing circuit, 128 is a recording amplifier, 129 is a recording head, 130 is a recording medium, 131
132 is a reproduction head, 132 is a reproduction amplifier, 135 is a luminance signal reproduction processing circuit, 134 is a color signal reproduction processing circuit, 135 is a synthesis circuit, 136 is a video signal output terminal, and the above is V.
It constitutes 'l'R. A television signal input from the - antenna 101 and selectively detected by -102 passes through the switching circuit 103, passes through the signal processing circuit 104, and is applied to the ghost removal circuit 105. Signal processing circuit 104
In the case of a broadcast television signal, it is passed through without any special processing. The ghost removal circuit 105 includes a waveform equalization circuit 106, a detection control circuit 107, and a timing circuit 108. The timing circuit 108 extracts one horizontal scanning period with the vertical blanking period of the video signal into which the OCR signal is inserted, and performs the detection control circuit 107 using a clock signal obtained from a color burst or the like.
and controls the waveform equalization circuit io6. In this figure, the detection control circuit 107 extracts the GCk signal from the output signal of the waveform equalization circuit 106, and the equalization amount of the waveform equalization circuit 106 (if the waveform equalization circuit is configured with a transversal filter) is set to eliminate the ghost. , its tap coefficient), it is constructed using a so-called negative feedback loop. In the ghost removal circuit 105, the video signal from which the ghost has been removed is used by the video signal processing circuit 109 and the display device 110 to display the video of the television signal on a cathode ray tube.

On the other hand, a television signal input from an antenna 121 and selectively detected by a tuner 122 passes through a switching circuit 123 and is separated into a luminance signal and a color signal by a luminance color separation circuit 125. These signals are processed by a luminance signal reproduction processing circuit 126 and a color signal reproduction processing circuit 127, respectively, and recorded on a recording medium 130 via a recording amplifier 128 and a recording head 129. The other input of the switching circuit 125 is an input terminal 124 from another video device.゛Good signals recorded on the recording medium 130 are sent to the playback head 1S1,
The luminance signal and the color signal are extracted by the reproduction amplifier 132, processed by the luminance signal reproduction processing circuit 135 and the color signal reproduction processing circuit 134, respectively, and then sent to the synthesis circuit 1.
35 into a composite signal of the television signal, which is then passed through the video signal output terminal 156 and the video signal input terminal 111 to the display device 110, which is a cathode ray tube of the television receiver, through the switching circuit 103 of the television receiver, etc. The image is captured. In this case, the OCR signal etc. fluctuate over time (jitter) due to the so-called skinny effect caused by the head switching K that switches every field of the VTR, so the signal processing circuit 104 uses a circuit that absorbs this fluctuation and processes the signal according to the fluctuation. A signal is sent to timing circuit 108 to generate a timing clock. Also for home use V'
The composite signal output from J'H is based on the horizontal synchronization signal because the frequency relationship between the color burst, color signal subcarrier, etc. and the horizontal synchronization signal is not preserved as accurately as in the composite signal of the television signal. 'The signal processing circuit 104 also operates the ghost removal circuit 105 such as the timing circuit 108 and the detection control circuit 107 using the clock signal. Detailed explanation will be given from the 8th factor to FIG. 12. Also,
The antenna 121 is generally used in common with the antenna 101, and may be used in the same way in the present invention. According to this embodiment, even when receiving and viewing television broadcasts, VTRK recorded Later, when viewing a television receiver, the ghost removal circuit 105 is operated using the nine OCR signals transmitted in the television broadcast as a reference signal, so when a person watches the cathode ray tube of the television receiver, whether it is broadcast or VTR playback. Since ghosts can be removed and viewed, an efficient video playback and reception device can be constructed.In addition, OCR signals can be viewed with video signal bandwidth of 4
．． Since it has frequency component information for all 2MHz,
V! It is also useful as a reference signal for automatic correction of frequency characteristics caused by recording and reproducing 'R, and the ghost removal device 1
05 also enables automatic frequency characteristic correction, which also has the effect of obtaining good image quality.

Further, in this embodiment, the recording device is shown as a V'l'R example, but it can also be used for general video devices such as recordable video disk players and magnetic disk devices.

The second factor shows another embodiment of the present invention. Components with the same symbols as in FIG. 1 indicate the same functions.

The difference between this embodiment and FIG. 1 is that the ghost removal circuit to50
The same effect as in FIG. 1 can be obtained except that the input of the &output control circuit 107 is used as the input signal of the waveform equalization circuit 106.

FIG. 3 shows still another embodiment of the present invention.

Reference numeral 301 denotes a separation control circuit, and the same reference numerals as in FIG. 1 indicate the same functions.

The separation control circuit 301 controls the operation of the luminance color separation circuit 125 to be interrupted during the vertical blanking period of a television signal such as an OCR signal in order to record the OCR signal as a luminance signal.

According to this embodiment, since the OCR signal can be accurately recorded as a luminance signal on the VTR, it is possible to stabilize the operations of ghost removal and frequency characteristic correction.

FIG. 4 shows still another embodiment of the present invention.

Reference numeral 401 is a reference signal generation circuit, and other components having the same symbols as the first factor indicate the same functions.

Reference signal generation circuit 401, television signal OC
When a signal with the same specifications (format) as the R signal is generated and an OCR signal is received from a broadcast station that is not transmitted during television broadcasting, or from other video equipment such as a video camera, the input terminal 125 and switching circuit 124 By simultaneously recording the signal from the reference signal generation circuit 401 when recording via the VTR, automatic frequency characteristic correction can be performed by the signal processing circuit 104 and the ghost removal circuit 105 during VTR reproduction. Also,
When creating a V'l'R soft tape or a video disc, the reference signal generating circuit 401 can similarly perform automatic frequency characteristic correction by recording a signal in the same format as the OCR signal at the same location in the vertical blanking. can be done.

According to this embodiment, since an OCR signal can be generated and recorded, frequency characteristics can be automatically corrected during playback, and a good image can be enjoyed.

FIG. 5 shows still another embodiment of the present invention.

501 and 502 are switching circuits, 503 is a luminance color separation circuit,
504 and 109 are video signal processing circuits, 505° is a luminance signal input terminal, 506 is a color signal input terminal, 507 is a luminance signal output terminal, 508 is a color signal output terminal, and other numbers are the same as in Fig. 1. indicate the same function.

This embodiment shows a case where the VTR has separate luminance signals and chrominance signals and reproduces them without using a composite signal of a television signal. In this case, the luminance signal reproduction processing circuit 13
3 is applied to the signal processing circuit 104 via a luminance signal output terminal 507 and a luminance signal input terminal 505. Since the OCR signal is recorded as a luminance signal, it is processed by the signal processing circuit 104 and then applied to the ghost removal circuit 105 via the switching circuit 501, where the ghost is removed using the OCR signal as a reference. After that, the switching circuit 501
A luminance signal is applied to a video signal processing circuit 504 via a switching circuit 502 that is linked to the video signal processing circuit 504 . On the other hand, the output of the color signal reproduction processing circuit 134 is applied to the video signal processing circuit 504 via the color signal output terminal 508, the color signal input terminal 506, and the truncated circuit 502. Video processing is performed using these luminance color signals, and an image is obtained on the display device 110.

In this embodiment, ghost removal was performed using only the luminance signal, but since the sensitivity of human vision to color is lower than the sensitivity to luminance, it is believed that a good image can be obtained using only the luminance signal.

According to this embodiment, a VTR having luminance and color separation output terminals
It also enables ghost removal and automatic frequency characteristic correction, and has the effect of allowing you to enjoy good images.

FIG. 6 shows still another embodiment of the present invention.

Reference numeral 106B indicates a waveform equalization circuit, and other components having the same symbols as in FIG. 5 indicate the same functions.

The difference from the fifth factor is that the waveform equalization circuit 1 also applies to color signals.
06B is provided to perform ghost removal, etc. O
Since the CR signal is included in the luminance signal, the waveform equalization circuit 106B is controlled by the output of the detection control circuit 107 that controls the waveform equalization circuit 106.

According to this embodiment, there is an effect that ghosts are removed from color signals, and even better images can be enjoyed.

7th still another embodiment of the present invention will be shown.

Components with the same symbols as in FIG. 1 indicate the same functions.

In this embodiment, an example of a television receiver is shown in which the V'l'R output is R-modulated and inputted to the antenna 101 without using the switching circuit 103.

The signal processing circuit 104 detects the frequency relationship between the color burst of the video signal output from the tuner 102 and the horizontal synchronizing signal, detects the timing of the horizontal synchronizing signal for each shift field, and automatically switches the timing according to the quality of the video signal. The ghost removal circuit 105 is used. The signal processing circuit 1
04 is shown in FIGS. 8 to 12.

According to this embodiment, the signal processing circuit 104 uses V'J
Even when a reproduced signal from a signal such as 'R' is input to the antenna, ghosts are removed, so that a good image can be enjoyed.

FIG. 8 shows an embodiment of a signal processing circuit according to the present invention.

801 is a synchronous separation circuit, 802 is a PLL circuit,
Components with the same symbols as in FIG. 1 indicate the same functions.

As mentioned in Fig. 1, due to the skinny of V'I'R, the horizontal synchronizing signal and OCR signal fluctuate temporally for each field of the television signal υ, and the color burst signal of the VTR output becomes the horizontal synchronizing signal. Since the timing and frequency relationship with the OCR signal and the on-air television signal have not been determined, the synchronization separation port I! The output of PLL 801 and the output of PLL 802 locked to that output are used. First, synchronous separation circuit 8
01 maintains the vertical synchronization signal and the horizontal synchronization signal, obtains the timing of the OCR signal in the horizontal scanning period with the vertical blanking period, and generates a clock signal (generally 910fi) with the frequency fIoN times the horizontal synchronization signal. It is added to the ghost removal circuit 105.

According to this embodiment, in order to operate the boss removal circuit based on the horizontal synchronization signal, the clock signal that closely matches the timing with the OCR signal is used as the reference.
This has the effect of providing good performance such as ghost removal.

FIG. 9 shows another embodiment of the signal processing circuit of the present invention. 9
01 is an analog-digital conversion circuit (hereinafter abbreviated as ADC), 902 is a memory, 903 is a clock regeneration circuit,
904 is a PLL, and the same symbols as in FIG. 8 indicate the same functions.

In this embodiment, the gaps 1-, etc. generated by the VTR are transferred to the ADC9.
01 once as a digital signal, and the clock regeneration circuit 90
Memory 902 with the clock signal according to the skinny obtained in step 3.
The memory 90 is stored in the PLL 904 using an averagely constant clock signal without responding to skinny etc.
2) Output the signal stored in C. A so-called jitter absorption memory 902 is used. Note that the PLL9040 has a long time constant and maintains the same response characteristics as the PLL802 described above.

According to this embodiment, since jitter such as skinny can be absorbed by the signal processing circuit, there is an effect that in addition to performance such as excellent ghost removal, it is possible to enjoy a good image with less jitter.

The tenth factor shows still another embodiment of the signal processing circuit of the present invention. 100s is a color burst separation circuit, 1004 is a PLL circuit, and 1005 is a clock difference detection switching circuit.Those with the same symbols as in FIG. 8 indicate the same functions.

The difference from FIG. 8 is that when reproducing V'rR, the output signal from the PLL circuit 802 is used, and when receiving an on-air television signal, the output signal from the PI, I, and circuit 1004 is used. Using the color burst obtained by the color burst separation circuit 1003, a PLL circuit 1004 obtains a four-wave signal (generally 4 fsa) having the color AM wave frequency f8a(1)M times the television signal. This signal is used for on-air television signal reception gIAK. PL when playing V'l'R
Output clock signal of L circuit 802 and PLL circuit 1004
Since the output signal is different from the four-way signal, the PL,
The output of the L circuit 802 is transferred to the clock difference detection switching circuit 1005.
It is automatically determined and switched, and added to the timing circuit 108. Note that this switching can also be determined by the selection of the switching circuit 102. However, in the case shown in the example of FIG. 7, automatic discrimination is more effective.

According to this embodiment, since the signal processing circuit can appropriately switch and use the clock signal according to the input video signal, there is an effect that excellent performance can be obtained with good ghost removal.

FIG. 11 shows still another embodiment of the signal processing circuit of the present invention. 1101 is a switching circuit, 1102 is a filter, 11
03 is a synchronization separation switching control circuit, and those having the same symbols as the other first factors indicate the same functions.

This embodiment is effective when an OCR signal or the like is subjected to waveform distortion in a brightness/color separation circuit of a VTR. OCR
A filter 1102 is used for direct planking signals such as signals.
The switching circuit 1101 and the synchronization separation switching control circuit 1103 apply the signal that has passed through the filter 1102 to the ghost removal port W&105, and during the video signal period, the signal before passing through the filter 1102 is applied to the ghost removal circuit 1105. A simple filter is an L/PF that cuts off the color signal band.

According to this embodiment, since the OCR signal can be filtered, the present ghost removal circuit 105 operates when reproducing the signal recorded through the V'f'H luminance color separation circuit, and can remove a certain amount of ghost. effective. Also,
This also has the effect of preventing abnormal operation of the ghost removal circuit which attempts to correct the waveform distortion of the reference signal due to the waveform distortion of the GOR signal caused by the luminance/color separation circuit.

FIG. 12 shows still another embodiment of the signal processing circuit of the present invention. 1201 is an inverse brightness color separation filter, 1202 is a subtraction circuit, and 1203 is a delay circuit.Those having the same symbols as in FIG. 11 indicate the same functions.

In this embodiment, an inverse luminance color separation filter 1201 composed of a delay circuit 1203 that delays a signal by a horizontal scanning period and a subtraction circuit 1202 generates a luminance color signal composed of a general one horizontal scanning period delay and addition circuit. Obtain the inverse characteristics of the luminance signal separation system of the separation circuit, and calculate the OC of the vertical blanking period.
This corrects the R signal and the like.

As a result, according to this embodiment, the waveform distortion of the OCR signal caused by the V'l'H luminance color separation circuit can be corrected, so that the operation of the ghost removal circuit 105 can be stabilized, and it is possible to enjoy good images. There is an effect that can be done.

As mentioned above, specific examples of the signal processing circuit 104 are shown in FIGS. 8 to 12. Although the explanation has been given using Q as an example, the specific embodiment of the signal processing circuit 104 is similarly applicable to the seventh factor from FIG.

FIG. 13 shows another embodiment of the invention. Reference numeral 1301 is a stability detection circuit, and those having the same reference numerals as those in the narrow tube 1 designate the same functions.

In this embodiment, abnormal operation of the ghost removal circuit 105 is prevented by providing the stability detection circuit 1301. Specific examples of the stability detection circuit 1501 are shown in FIGS. 14 to 17. When the stability detection circuit 1301 determines that the ghost removal circuit 105 may become unstable, the stability method detection circuit 1301 detects the detection circuit 107.
by controlling the equalization amount of the waveform equalization circuit 106 to a certain constant value,
For example, it is fixed to a characteristic in which no waveform equalization is performed (flat frequency characteristic).

According to this embodiment, when the ghost removal circuit 105 becomes unstable due to detection control by the stability detection circuit 1301, the equalization is performed by fixing the equalization amount of the waveform equalization circuit 106 to a constant value. Since the ghost removal circuit can be interrupted, abnormal operation of the ghost removal circuit can be prevented, which has the effect of eliminating the possibility of abnormal images being generated.

FIG. 14 shows an embodiment of the stability detection circuit of the present invention.

1301 is a stability detection circuit, 1401 is a fluctuation detection circuit, and the same symbols as in FIG. 8 indicate the same functions.

A fluctuation detection circuit 1401 determines the magnitude of frequency fluctuation of the clock signal obtained by the PLI circuit 802. If the frequency fluctuation is large, the detection control circuit 10
7 to fix the amount of waveform equalization to a certain constant value.

If the frequency fluctuation of the output signal from the PLL circuit 802 is large, the interval between the synchronization signals of the video signal is unstable, and there is a high possibility that the ghost removal circuit will operate abnormally.

However, according to this embodiment, since the fluctuation can be detected and waveform equalization can be stopped, there is an effect that there is no possibility of displaying an abnormal image.

FIG. 15 shows another embodiment of the stability detection circuit of the present invention. 1501 is a circuit for determining the amount of equalization, and other 1s
In the figure, the same reference numerals as No. 148 indicate the same functions.

The detection control circuit 1
If the equalization amount obtained by 07 shows an extreme value above or below a certain value, it is limited to a certain range of values.

According to this embodiment, since the equalization amount of the waveform equalization circuit 106 can be limited to a certain range, there is an effect that even if an abnormal operation of the ghost removal circuit 105 occurs, there is no possibility of displaying an abnormal image.

FIG. 16 shows still another embodiment of the stability detection circuit of the present invention. Reference numeral 1601 is a switching determination circuit, and the same reference numerals as in FIGS. 13 and 14 indicate the same functions.

A switching determination circuit 1601 detects that the switching circuit 103 is connected to the video signal input terminal 111 side, fixes the equalization amount of the waveform equalization circuit 1060, and stops the operation of the ghost removal circuit 105. It is.

When the switching circuit 103 is connected to the video signal input terminal 111 side, there will be no OCR signal for on-air television broadcasts such as V'l'R.
Since there are fluctuations due to differences in the relationship between ti and f8G, deviations, etc., operating the ghost removal circuit 105 based on such a signal has a very high possibility of abnormal operation. .

According to this embodiment, the connection of the switching circuit 103 can be detected by the switching determination circuit 1601, and the equalization amount of the waveform equalization circuit 106 can be fixed at a certain value, so that the effect of preventing abnormal operation of the ghost removal circuit 105 is achieved. be.

FIG. 17 shows still another embodiment of the stability detection circuit of the present invention. Reference numeral 1701 indicates a comparison and difference discrimination circuit, and reference numeral 1702 indicates an averaging circuit.Those having the same reference numerals as those in FIGS. 15 and 14 indicate the same functions.

The averaging circuit 1702 extracts the OCR signal input to the detection control circuit 107 and averages the OCR signals of a plurality of times within one horizontal period to obtain an average OCR signal of one horizontal period. A comparison difference determination circuit 1701 detects the difference between this average OCR signal and a certain GCm'l signal. A small difference indicates that the transmission path is stable due to ghosts, and a large difference indicates that the transmission path is unstable and the OCR signal is uncertain. Therefore, if the difference is greater than a certain value, the waveform equalization circuit 1
The ghost removal circuit 105 fixes the equalization amount of 06 to a constant value.
stop the operation. Note that when obtaining the average OCR signal, it is necessary to interrupt the waveform equalization operation by the detection control circuit 107 and the waveform equalization circuit 106.

According to this embodiment, since the ghost removal operation can be stopped when the OCR signal is uncertain, there is an effect that there is no possibility of displaying an abnormal image.

FIG. 1B shows yet another embodiment of the invention.

1801 is a text multiplex signal processing circuit, 1802 is a display device, and those with the same symbols as in Figure 3 indicate the same functions.During the vertical blanking period of television broadcasting, text multiplex broadcasting also exists, and By using the VTR described in FIG. 3, a character multiplex signal is also recorded on the VTR, and information is obtained by the character multiplex signal processing circuit 1801 and display device 18o2 upon reproduction. Note that the display device 1802 may be the display device 110, but in this figure, a dedicated display device such as a printer is also considered and is described with a different symbol.

According to this embodiment, since a VTRK multiplex signal can also be recorded and reproduced, it is effective when combining subtitle programs of a text multiplex broadcast and recording the same.

FIG. 19 shows yet another embodiment of the present invention.

1901 is a character multiplex signal generation circuit υ, and other 18th
Items with the same symbols as in the figure indicate the same functions.

The text multiplex signal generator 1901 generates a signal in the same format as the text multiplex signal of the television signal, records it on a VTRK, and when playing it back, separately from the video signal, sends it through the text multiplex signal processing circuit 1801. indicate.

According to this embodiment, since signals other than video signals can be multiplexed recorded on the VTR as character multiplexed information, there is an effect that a large amount of information can be recorded on the same tape.

FIG. 20 shows yet another embodiment of the present invention.

Components with the same symbols as in FIGS. 3 and 18 indicate the same functions.

In this embodiment, OCR signals and text multiplex signals transmitted during the vertical blanking period of television broadcasting are recorded on a VTR, ghosts are removed using the OCR signals during playback, and text multiplex information is transmitted from the text multiplex signal. Processing circuit 180
1 to demodulate.

According to this embodiment, both the character multiplex signal and the OCR signal can be transmitted to the VTR.
Since both can be used during playback, it is very effective to use the ghost-removed image and the subtitled program of a teletext broadcast at the same time. Further, although the transmission of the text multiplex signal is also subject to waveform distortion due to ghosts, since the ghost is removed by the ghost removal circuit 105, there is also the effect that the text multiplex signal can be accurately demodulated.

FIG. 21 shows yet another embodiment of the present invention.

Components with the same symbols as in FIGS. 12 and 20 indicate the same functions.

In this embodiment, the reverse luminance color separation filter 1201 uses V! 'H is corrected using the inverse characteristics of a general luminance color signal separation circuit.

According to this embodiment, since the distortion of the luminance signal due to general V'l'H can be corrected, it is possible to demodulate the character multiplex signal.

〔Effect of the invention〕

According to the present invention, since ghost removal can be performed based on the OCR signal even when reproducing signals recorded on a VTR by the signal processing means and switching means provided in front of the ghost removal device, it is possible to reproduce high-quality images. be.

Furthermore, since the OCR signal is a reference signal for the entire video signal band, it also has the effect of correcting deterioration in frequency characteristics during recording and reproduction of a VTR.

Further, according to the present invention, since luminance color separation control such as during the vertical blanking period can be performed, it is possible to record signals during the vertical blanking period such as OCR signals and character multiplex signals.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention, FIG. 2 is a block diagram showing another embodiment of the present invention, and FIGS.
FIG. 8 is a block diagram showing still another embodiment of the present invention.
FIG. 9 is a block diagram showing another embodiment of the signal processing circuit of the invention, and FIGS. 10 to 12 are block diagrams showing one embodiment of the signal processing circuit of the invention. 13 is a block diagram showing another embodiment of the present invention; FIG. 14 is a block diagram showing an embodiment of the stability detection circuit of the present invention; FIG. , FIG. 15 is a block diagram showing another embodiment of the stability detection circuit of the invention, FIGS. 16 to 17 are block diagrams showing still another embodiment of the stability detection circuit of the invention, and FIG. Figure to 2nd
FIG. 1 is a block diagram showing yet another embodiment of the present invention. Explanation of symbols 103...Switching circuit, 104, 104...
... Signal processing circuit, 105 ... Ghost removal circuit, 108 ... Timing circuit, 301 ...
...Separation control circuit, 801...Synchronization separation circuit, 802.1004...PLL circuit, 902.
... Memory, 1501.1301 ... Stability detection circuit, 1801 ... Character multiplex signal processing circuit.

Claims (1)

[Claims] 1. A television tuner that selects and detects a television transmission signal and outputs a video composite signal, and an output signal of the tuner and an output signal of another video device that outputs the video signal. A switching means for inputting and outputting a signal that selects one of the signals or synthesizes a plurality of them, a signal processing means for processing the output signal of the switching means, and a waveform equalization for correcting the output signal of the signal processing means. and detection control means for determining the equalization amount of the waveform equalization means using the output signal or input signal of the waveform equalization means as a reference signal. 2. A first tuner of a television that selects and detects a television transmission signal and outputs a video composite signal, and a luminance color separation means that separates the output signal of the first tuner into a luminance signal and a color signal; storage means for processing each output signal of the luminance and color separation means and recording it on a recording medium; a reproduction means for detecting and reproducing the signal from the recording medium; and a reference for a video composite signal of the output signal of the first tuner. A video signal recording and reproducing device comprising a separation control means for stopping the operation of the luminance color separation means so that one period or the entire period of the vertical blanking period of the video signal including the signal period can be recorded as a luminance signal, and a television. a second tuner of the television that selects and detects a video transmission signal and outputs a video composite signal; and a switching device that switches between the output signal of the second tuner and the output signal of the reproducing means of the video signal recording and reproducing device. a signal processing means for processing the output signal of the switching means; a waveform equalization means for correcting the output signal of the signal processing means; and a waveform equalization means using the output signal or input signal of the waveform equalization means as a reference. 1. A video signal reproducing apparatus comprising: a television receiver provided with detection control means for determining an equalization amount of the means; 3. A reference signal generating means for generating the same reference signal as the reference signal transmitted during the vertical blanking period of the video composite signal transmitted by the television transmission signal is provided, and the reference signal is generated during the vertical blanking period of the video signal. a television tuner that selects and detects a television transmission signal and outputs a video composite signal; an output signal of the tuner and a reproduction output signal of the video signal recording and reproduction apparatus; a switching means for switching, a signal processing means for signal processing the output signal of the switching means, a waveform equalization means for correcting the output signal of the signal processing means, and a 1. A video signal reproducing device comprising: a television receiver provided with detection control means for determining the equalization amount of the waveform equalization means; 4. An input terminal for a video signal reproducing or recording/reproducing device that separates and outputs the luminance signal and color signal of the video signal, and a television tuner that selects and detects the television transmission signal and outputs the video composite signal. , means for switching between the output signal of the tuner and input terminals of the luminance signal and color signal of the video signal reproducing or recording/reproducing device; a signal processing means for processing the output signal of the switching means; and a signal processing means for processing the output signal of the switching means; detection control means for determining the equalization amount of the waveform equalization means using the output signal or input signal of the waveform equalization means for correcting the output signal as a reference signal; A television receiver characterized in that it uses only the output signal of a luminance signal from a signal reproduction or recording/reproduction device. 5. A television tuner that selects and detects a television transmission signal and outputs a video composite signal, a signal processing means that processes the output signal of the tuner, and a waveform equalizer that corrects the output signal of the signal processing means. and detection control means for determining the equalization amount of the waveform equalization means using the output signal or input signal of the waveform equalization means as a reference signal. 6. As the signal processing means, a reference clock signal generator that inputs and outputs a video signal and generates a reference clock signal that is an integral multiple or an integral multiple of an integer of the horizontal synchronizing signal of the video signal, using the horizontal synchronizing signal as a reference. means is provided, and when the switching means selects an input signal other than the television tuner, the reference clock signal which is the output of the reference clock signal generation means is transmitted to both or one of the waveform equalization means and the detection control means. 5. The television receiver according to claim 1, wherein the television receiver is used as a reference clock for the television receiver. 7. The television receiver according to claim 1, wherein the signal processing means comprises time axis correction means for absorbing time axis jitter of the video signal. 8. Analog-to-digital conversion means for converting a video signal into a digital video signal as the time axis correction means;
A memory for storing the output signal of the analog-to-digital conversion means, a synchronization separation means for separating a synchronization signal from the video signal, and a clock signal synchronized with the horizontal synchronization signal of the synchronization separation means, which reproduces a clock signal synchronized with the write clock of the memory. 8. The television set according to claim 7, further comprising a clock reproducing means for regenerating a horizontal synchronizing signal of the synchronization separating means, and a PLL means for reproducing a clock signal that averagely matches the horizontal synchronizing signal of the synchronization separating means and using it as a read clock for the memory. John receiver. 9. As the signal processing means, a first standard that inputs and outputs a video signal and generates a reference clock signal that is an integral multiple or an integral multiple of the horizontal synchronizing signal of the horizontal synchronizing signal of the video signal. a clock signal generation means, a second reference clock signal generation means for generating a reference clock signal based on the color carrier burst signal of the video composite signal, and a reference clock signal that is an output of the second reference clock signal generation means; A clock difference detection circuit is provided to detect the frequency or phase difference between the clock signal and the reference clock signal which is the output signal of the first reference clock signal generating means, and when the difference between the clock signals is larger than a certain value, When the output of the first reference clock signal generation means is smaller than a certain value, the output of the second reference clock signal generation means is used as a reference clock for both or one of the waveform equalization means and the detection control means. The television receiver according to claim 1 or claim 5, wherein the television receiver is used as a television receiver. 10. The output signal of the video signal processing means is input, one period or the entire period of the vertical blanking period of the video signal including the reference signal period of the video composite signal is filtered, and the output is input to the waveform equalization means. 10. The television receiver according to claim 1, further comprising a filter added to the filter. 11. The television receiver according to claim 10, wherein the filter is a low-pass filter that cuts off or attenuates a color signal band of the video composite signal. 12. The filter is provided with a subtraction means for obtaining a difference between two input signals, and a delay means for delaying the output by a time corresponding to the horizontal scanning period or vertical scanning period of the video signal, and the output of the delay means is subjected to the subtraction. 11. The television receiver according to claim 10, wherein the input signal is returned to one input of the means. 13. Providing a waveform equalization stability detection means, and fixing the equalization amount of the waveform equalization means to a certain constant value by controlling the detection control means with an output signal of the waveform equalization stability detection means. A television receiver according to any one of claims 1 to 12, characterized in that: 14. The television receiver according to claim 13, wherein the waveform equalization stability detecting means includes determining means for determining the magnitude of frequency fluctuation of the clock signal of the reference clock signal generating means. 15. The waveform equalization stability detection means includes a determination means for determining the magnitude of the equalization amount of the waveform equalization means obtained by the detection control means. TV receiver. 16. The television reception according to claim 13, wherein the waveform equalization stability detection means includes a determination means for determining that the switching means has selected an input signal other than the television tuner. Machine. 17. The waveform equalization stability detection means averages the reference signal used as a reference for the detection control means a plurality of times, and calculates the uncertainty of the reference signal by the difference between the averaged reference signal and each reference signal. 14. The television receiver according to claim 13, further comprising means for determining uncertainty in the reference signal to be detected. 18. A television tuner for selectively detecting a television transmission signal and outputting a video composite signal, a luminance color separation means for separating the output signal of the tuner into a luminance signal and a color signal, and a luminance color separation means for separating the output signal of the tuner into a luminance signal and a color signal A recording means for processing output signals individually and recording them on a recording medium, and a video signal recording and reproducing apparatus for detecting and reproducing signals from the recording medium, wherein a video signal including a reference signal period of the video composite signal of the output signal of the tuner is provided. A video signal recording and reproducing apparatus characterized in that a separation control means is provided for stopping the operation of the luminance color separation means so that one period or the entire period of the vertical blanking period of the signal can be recorded as a luminance signal. 19. In a video signal recording or reproducing device that records or records and reproduces video signals on a recording medium, generating a reference signal that is the same as the reference signal transmitted during the vertical blanking period of the video composite signal transmitted by the television transmission signal. What is claimed is: 1. A video signal recording or recording/playback device characterized in that the video signal recording or recording/playback device is provided with a reference signal generating means for performing multiplex recording during a vertical blanking period of the video signal. 20. A video recording medium in which the same reference signal as the reference signal transmitted during the vertical blanking period of a video composite signal transmitted by a television transmission signal is multiplexed and recorded during the vertical blanking period of the video signal. 21. Reproducing a recorded video recording medium in which the same reference signal as the reference signal transmitted during the vertical blanking period of the video composite signal transmitted by the television transmission signal is multiplexed in the vertical blanking period of the video signal. Video signal reproducing device. 22, a first tuner for a television that selects and detects a television transmission signal and outputs a video composite signal;
a luminance/color separating means for separating an output signal of the tuner into a luminance signal and a color signal; a recording means for processing each output signal of the luminance/color separating means and recording it on a recording medium; and detecting a signal from the recording medium. a reproducing means for reproducing, and the forty-first
Separation control for stopping the operation of the luminance/color separation means so that one period or the entire period of the vertical blanking period of the video signal including the character multiplex signal period of the video composite signal of the output signal of the tuner is included in the recording as a luminance signal. a second tuner of a television that selects and detects a television transmission signal and outputs a video composite signal; an output signal of the second tuner and the video signal recording device; A character multiplexing reproduction device comprising a switching means for switching an output signal of a reproduction means of a reproduction device, and a character multiplexing receiver provided with a character multiplexing signal processing means for processing an output signal of the switching means into a character multiplexing signal. 23. Vertical blanking of the video signal by providing a character multiplex signal generation means for generating a character multiplex signal of the same format as the character multiplex signal transmitted during the vertical blanking period of the video composite signal transmitted by the television transmission signal. A video signal recording and reproducing device that records a character multiplex signal in a period, a television tuner that selects and detects a television transmission signal and outputs a video composite signal, and an output signal of the tuner and the video signal recording and reproducing device. A character multiplexing receiver comprising a character multiplexing receiver provided with a switching means for switching between a reproduced output signal and a character multiplexing signal processing means for processing an output signal of the switching means into a character multiplexed signal. playback device. 24. A video recording medium in which a character multiplex signal of the same format as the character multiplex signal transmitted during the vertical blanking period of the video composite signal transmitted by the television transmission signal is multiplexed and recorded during the vertical blanking period of the video signal. . 25. A video recording medium in which a character multiplex signal of the same format as the character multiplex signal transmitted during the vertical blanking period of the video composite signal transmitted by the television transmission signal is multiplexed and recorded during the vertical blanking period of the video signal. A character multiplex playback device or a video signal playback device for playing back.