KR920010940B1 - Television display device and the same method in pip - Google Patents

Abstract

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Description

TV display device with picture-in-picture display function and picture-in-picture display method

1 is a diagram for explaining a picture in picture display method of the present invention.

2 is a view for explaining the conversion of the injection player.

3 is a block diagram showing an embodiment of a picture-in-picture display device of the present invention.

4 is a circuit diagram of a coefficient address generator included in the memory control circuit of FIG.

5 is a timing chart of signals of respective parts of the coefficient address generator of FIG.

6 is a timing chart of signals of respective parts of a pit circuit in phase.

7 is a diagram for explaining the deviation of a sampling pattern.

8 is a block diagram showing a second embodiment of this invention.

9 is an explanatory diagram of a memory control circuit.

The present invention displays a video signal from a Han signal source in an interactive area of a display device based on a video signal included in a television signal generated by two signal sources, and displays the video signal from the other signal source on the screen. A television display device and a picture-in-picture display method having a picture-in-picture display function displayed on a part of an image area in a conversational area.

Picture-in-picture function for receiving NTSC-type television signals transmitted from two broadcasting stations, and displaying, as a reduced picture, an image by the other video signal in a part of the display area of the image displayed by one television signal. A television receiver (hereinafter, abbreviated as PinP TV display device) having a structure is disclosed (Japanese Patent Application Laid-open No. TH59-37913). An overview of the prior art is described below.

Such a PinP TV receiver has two field memories for storing the first and second fields of the video signal of a small screen, and a first field for detecting whether the TV signal of the interactive area is the first field or the second field. The detection circuit and the second field detection circuit for detecting the TV signal in the large-scale image area and the first field or the second field, the TV signal in the interactive area are the second field and the TV signal in the digest area are the first. The field has a memory controller that delays the reading of a small picture video signal in the horizontal scanning period.

The object of the prior art is to prevent the interlace relation from reversing and obtain an appropriate image when the TV signal of the interactive area is the second field and the video signal of the digestive area is the first field. In recent years, as a TV system, a high quality television system has been proposed in addition to the standard television system.

In such a state, for example, it is considered to display an image by a standard television system TV signal in a part of an interactive region by a TV signal of a high definition TV (HDTV) system. It is becoming.

A method of band-compressing and transmitting the high-definition television signal (60 fields of 1125 lines) has been proposed. The proposed scheme includes multiple subsample transmission schemes using field value and interframe offset subsampling.

One of the proposed multi-sub sample transmission schemes includes a scheme called MUSE (Multiple Sub-Nyquist Sampling Encoding).

The decoder of the MUSE method is as follows. In other words, the transmission signal is subjected to A / D conversion, digital signal processing is performed, and the original signal is restored to the original high-definition TV signal, and then D / A conversion is used as an analog signal. In this case, a clock signal of A / D conversion and digital signal processing is formed by dividing from a 97.2 MHz original oscillation signal in phase synchronization with a synchronization signal included in a video signal.

In addition, in the current standard TV system, for example, the NTSC system, a color carrier of 3.58 MHz is generated in synchronization with the color bust signal included in the horizontal blanking period when the required color information is extracted from the carrier color signal.

However, the standard television system, for example, the NTSC system and the high-definition television system, differs in specification.

For example, in the NTSC system, the aspect ratio of the screen is 4: 3 and 525 players / frame. On the other hand, in the high-definition television system, the aspect ratio of the screen is 16: 9 and the player is 1125 / frame. .

The frequency of the horizontal synchronizing signal and the vertical synchronizing signal is also different. Therefore, it is not possible to simply display a small picture of the TV signal of the standard television system in a part of the conversational area of the TV signal of the high quality television system.

Accordingly, one object of the present invention is to display a video signal from one signal source on an interactive area of a screen of a TV display device based on a video signal included in a television signal of another standard generated from two signal sources, There is provided a television display device capable of displaying a video signal from the other signal source on a part of an interactive area of a screen. It is also an object of the present invention to provide a PinP TV display device capable of displaying a screen by a video signal of a TV system in a part of an interactive area by a TV signal of an HDTV system.

It is still another object of the present invention to provide a PinP TV display device for converting a horizontal scan player in which a horizontal scan player of a standard video signal is adapted to an aspect ratio of an HDTV system in a television display device having a picture-in-picture display function. To provide.

A further object of the present invention is to simplify the overall configuration by using both an oscillation source for interactive image formation and an oscillation source for digestion formation in a television display device having a picture-in-picture display function.

Another object of the present invention is to provide a video signal of the HDP system and the standard TV signal of the PinP TV display device without the deterioration of image quality even if the field frequency is different. In some areas, display is performed by combining a video image of a standard video signal.

In simple terms, the present invention provides a first receiver circuit for receiving a first TV signal of a first television signal and a second television signal having different specifications generated from two signal sources and a second method of a standard method. The second received signal for receiving the TV signal and the second video signal included in the second TV signal in a part of the conversational area by the first video signal included in the first TV signal. A television receiver having a picture-in-picture display control circuit for displaying an image, wherein the display control circuit generates a first clock signal based on a synchronization signal included in a first TV signal. A second clock signal for generating a second clock signal having a frequency L / K (where K and L are natural numbers) times the color carrier, in synchronization with the color burst signal included in the generating means and the second TV signal; Generating means; A second clock signal generating means for generating a second clock signal and the number of horizontal scanning lines of the second TV signal based on the screen by the first TV signal and the screen by the second TV signal Horizontal scan line number converting means for converting to a predetermined number; recording clock generating means for generating a recording clock signal in which the second clock signal is mirrored by a predetermined phase of a clock period every one horizontal period; and the recording clock generating means. A second video signal read from the memory of the memory device for recording a second video signal from the horizontal scanning line converting stage and reading from the first clock signal at a recording clock generated by the first clock signal; And a substituting means for substituting for the video signal.

In operation, in order to replace the image by the second television signal with a part of the conversation by the first television signal, it is necessary to make the first TV signal and the second TV signal the same signal band.

To this end, the first video signal is recorded in the memory at a frequency K / L times the color carrier included in the second TV signal, and is synchronized with the synchronization signal included in the first TV signal. You can read using.

Then, the clock signal L / K times the frequency of the color part carrier wave is shifted in phase by a predetermined clock period every scan line and every frame.

Thus, the sample position of each scan line is displaced. For the purpose of eliminating such a shift in the sample position, a clock signal in which the second clock signal is shifted in phase by a predetermined clock period every horizontal period is generated by the recording clock generating means, and the clock signal is converted into the recording clock signal. The video signal included in the second TV signal is recorded in the memory.

As a result, the transition of the sample position is eliminated. The video signal included in the second television signal is replaced with a part of the dialogue by the video signal included in the first television signal. The number of horizontal scan lines is converted by the horizontal scan bow converting means for reducing the deformation of the image. By this conversion operation, a small screen without any deformation can be projected.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

It is a figure for demonstrating the PinP display method of this invention of FIG. Referring to the figure, the PinP TV receiver 1 is based on the TV signal of the HDTV system, and the interactive image 3 is displayed on the water pipe 2, and the TV signal of the standard system (for example, NTSC system). On the basis of this, an image (4) of the fire fighter is shown in the water pipe (2).

The video signal of the HDTV system is restored by a MUSE decoder included in the PinP TV receiver 1. The frequency of the clock signal used for this restoration is 92.7 MHz as indicated by the conventional example.

The frequency of the color carrier carrier of the NTSC system is 3.58 MHz. Therefore, when the PinP TV receiver 1 that displays a combination of a portion of an image of a high-definition television system-type TV signal and an image of an NTSC-type TV signal is read and recorded in a field memory, The recording frequency is L / K times 3.58MHz (K, L = 1,2,3, ...) and the reading frequency is 1 / Q times the original frequency 97.2MHz (1,2,3, ...). ), The circuit configuration is simple and economical since no new oscillator is required.

Here, the readout frequency of the video signal for image reproduction from the field memory is set to 1/2 of the original oscillation frequency and coincides with the maximum clock frequency of digital signal processing of the MUSE decoder.

By doing in this way, the video signal by NTSC system can be made into the same signal band as MUSE decoder signal, and the display which combined the video image on the interactive image can be performed.

高)와 대화상의 화고와의 비는 1:3 정도가 바람직스럽다. 본 실시예의 화고비는 1/3로 한 것을 설명한다.In this case fire extinguishing

It is desirable that the ratio between the height and the dialogue height is about 1: 3. The picture ratio of this embodiment is set to 1/3.

To realize this relationship, the number of field memory write scans is 5.37 MHz (L = 3, K = 2), and the read frequency from the field memory is 48.6 MHz (97.2 MHz / 2, that is, Q = 2).

However, since the frequency of 5.37 MHz is 1365/4 times the horizontal frequency of 15.75 KHz of the NTSC system, the phase shifts by 1/4 clock per frame for each horizontal syringe (see Fig. 7).

Therefore, by shifting the phase of the clock signal for recording by 1/4 clock every one horizontal period and every one frame, it is possible to eliminate the distortion of the image due to the phase shift. In the case of selecting such a frequency relationship, the horizontal scan line of the digestive system is installed as follows, and when the frequency (f _sc ) and the original frequency (f _oc ) of the color carrier are expressed in decimal (素 數), Done.

Moreover, the horizontal scanning frequency fH (HD) of the high-definition television system and the horizontal scanning frequency fN (NTSC) of the NTSC system are represented by the following equations, respectively.

Since the units of televisions expressing the size of the pixels differ between the horizontal and vertical directions, first, quantum televisions are matched.

Here, (sec) is used in the sense of the time required to scan the pixel as a unit in the vertical direction (TV) and in a unit in the horizontal direction.

This relationship is achieved when the aspect ratio 9:16, the sample rate 1 / 74.25 MHz effective scanning player 1035 (TV), and the effective pixel number 1920 are used from the Broadcasting Technology Association (BTA) S-001 standard.

It becomes In other words,

Becomes

In addition, M scan lines of the digestive video signal (where M≤N) are formed from NTSC NRODML scan lines, and the video signals of the high-definition television system before 12/11 time axis extension output from the MUSE decoder are digested. When replacing with a commercial video signal, the following relationship must be established for an aspect ratio of 3: 4 x 11/12.

X: Digestive level effective injection time

In other words,

It becomes

Substituting this formula (8) into this equation (8),

When the video clock signal is written to the memory, the clock clock frequency is set to WCK, and the read clock frequency from the memory is set to RCK.

ηH: The horizontal effective syringe-to-interval ratio of the current broadcast (NTSC) is 0.83. finally,

It becomes

If you calculate this (11),

It becomes

In other words, when the scanning line conversion is performed from 1.466 to one, the displayed image does not have any deformation of the figure. However, the closest scanning line conversion from 1.466 to one is difficult to make the circuit scale large. Scan line conversion is facilitated by setting an allowable range for deformation of the figure there.

For example, if a value of ± 1% is set as the allowable range of figure deformation, N / M should be within the range of the following equation.

If a natural number having the smallest N.M within this range is selected, N / M = 13.9. That is, the scanning line conversion from 13 to 9 may be performed.

2 is a diagram for explaining the conversion of the scanning lines from the thirteen to the nine. Referring to the same figure, A ″ to N1 and A ′ to N1 ′ on the right side respectively indicate the scanning lines of the first field and the second field according to the NTSC method, and I to X and I ′ to X ′ on the left side respectively represent HDTVs. The scanning line of the digestive tract displayed on the image is displayed.

For example, in order to produce nine scanning lines I-IV from the thirteen scanning lines A-M at equal intervals, the following calculation may be performed based on the current scanning line and the scanning line preceding one horizontal period.

,(0,0),

(0,0),

(0,0),

를 13개의 주사선마다에 순회시키는 것에 의하여 9개의 주사선을 만들어 낼 수가 있다.That is, the pair of coefficients (0.0), (1,0),

, (0,0),

(0,0),

(0,0),

It is possible to generate nine scanning lines by circulating each of the thirteen scanning lines.

For example, in FIG. 2, when the current signal is in FIG. 2C, the current signal C is multiplied by a factor of 4/9, and the signal B before one horizontal period is multiplied by a factor of 5/9. By adding these, the scanning line signal II can be obtained.

In the case where the current signal is C ', the current signal C' is multiplied by a coefficient of 6/9, and the signal B 'before the horizontal period is multiplied by a coefficient of 3/9, and these are added to add a scan line signal of II'. You can get

As described above, an image can be made by 433 horizontal scanning lines of the NTSC system. In the above embodiment, the read clock signal frequency is 48.6 MHz RCK and the write clock frequency Wck 5.37 MHz, but the read clock frequency is 1 / Q times the original source frequency of the HDTV system as described above. It can be set in the range, and the recording clock frequency may also be L / K times (L and K are natural numbers) of 3.58 MHz.

The conversion ratio (N / M) of the scanning athlete can be determined based on the frequency relationship and the height and tolerance of the image with respect to the dialogue image of the digestion. Collecting these frequency relations and the conversion ratios of the scanning athletes are shown in Tables 1 and 2 below. In addition, the present embodiment is within an error of 1% in the frequency relationship of the third row of Table 1.

NTSC horizontal effective scan rate: rHoff (NTSC) = 0.85

NISC vertical effective scan rate: rVeff (NTSC) = 0.935

TABLE 1

TABLE 2

3 is a block diagram showing an embodiment of a PinP TV receiver for realizing the PinP television display method. With reference to the figure, the phase broadcast signal received at the antenna 11 is supplied to the tuner 12 and the MUSE signal from this tuner 12 is supplied to the MUSE decoder 13. This MUSE signal is compressed at 8.1MHzDP band at the transmitting side. In this MUSE decoder 13, the MUSE signal is A / D converted, the A / D conversion output is digital signal processed, and a high-definition television system video signal SV1 having a sampling frequency of 48.6 MHz is obtained.

In this case, a clock signal synchronized with the synchronization signal included in the MUSE signal is output from the voltage controlled oscillator 14, and digital signal processing is performed based on this clock signal. In this way, the TV signal SV1 output from the decoder 13 is supplied to the insertion circuit 16 as a TV signal for the interactive area.

The vertical synchronizing signal and the horizontal synchronizing signal formed in the MUSE decoder 13 are supplied to the memory control circuit 25 as an interactive synchronizing signal.

On the other hand, the terrestrial broadcast signal received at the antenna 21 is supplied to the tuner 22, and the intermediate frequency signal from the tuner 22 is supplied to the intermediate frequency amplification and detection circuit 23, and the detection circuit 23 is provided. The NTSC video signal SV2 outputted from the A / D converter 26 is supplied to the A / D converter 26. The video signal SV2 converted from the A / D converter 26 into a digital signal is supplied to a counter 29 composed of a ROM (lead only memory), and after the predetermined coefficient is multiplied by the counter 29, the adder 30 Is supplied.

The video signal SV2 is supplied to a counter 28 made up of ROM with a delay element 27 having a delay time in the horizontal period interposed therebetween, and multiplied by a predetermined coefficient. The output of counter 28 is supplied to adder 30. The output signal of this adder 30 is supplied to the field memories 32 and 33 of the memory circuit 31, and is written to these memories 32 and 33 by field replacement. The video signal SV2 from the circuit 23 is supplied to the synchronous separation circuit 24.

The vertical synchronizing signal and the horizontal synchronizing signal separated by the synchronizing separation circuit 24 are supplied to the memory control circuit 25 as a digestive synchronizing signal. The coefficients multiplied by the counters 28 and 29 are supplied to the memory control circuit 25 based on the digestive synchronization signal. The coefficients multiplied by the counters 28 and 29 are controlled by the coefficient ROM address control portion included in the memory control circuit 25 based on the digestive synchronization signal. 4 is a circuit diagram showing an example of the coefficient ROM address control portion 50 included in the memory control circuit 25, and FIG. 5 is a timing chart of the coefficient ROM address control portion 50. As shown in FIG.

Referring to Figs. 4 and 5, the ROM address control section 50 uses a reset vertical synchronization signal as a reset input to count a horizontal horizontal synchronization signal for output, and outputs a 4-bit address signal. And a binary counter 52 for counting the vertical synchronization signal for fire extinguishing and outputting a 1-bit field detection signal.

The coefficient ROM address control section 50 is a circuit for implementing the conversion from the thirteen to nine of the above described scanning lines. Since the coefficients used for the conversion of the scanning player are filtered every thirteen scanning lines, and again different in the field, the output 4 bits of the hexadecimal counter 51 and the frame from the memory control circuit 25 to the ROMs of the counters 28 and 29 are converted. Control is performed by supplying the address 5 signal of a total of 5 bits of detection signal.

In this way, the signals obtained by delaying the current signal output from the A / D converter 26 and the current signal output from the delay element 27 by one horizontal period are multiplied by the counters 28 and 29, respectively. 30). As a result, 13 to 9 scan line transformations are performed. The video signal SV2 from the IF detection circuit 23 is supplied to the band amplifier circuit 36, and the color burst signal extracted from the band amplifier circuit 36 is supplied to the phase detector circuit 37.

The phase error signal from the phase detection circuit 37 is supplied to the voltage controlled oscillator (VCO) 38, and the output signal of the voltage controlled oscillator 38 is divided between the divider 39 having a division ratio of 1/3. And the phase detection circuit 37 is supplied. The phase detection circuit 37, the voltage controlled oscillator 38, and the divider 39 constitute an automatic phase control circuit, and the voltage controlled oscillator 38 is in phase synchronization with the color burst signal. A sinusoidal signal having a frequency three times the color carrier of 3.58 MHz is output.

Although the sinusoidal signal is not shown in the figure, after the waveform is shaped, the division ratio is supplied to the divider 40 having 1/2. In this way, the frequency divider 40 outputs a clock signal of 5.37 MHz, which is 3/2 times the frequency of the color carrier. The horizontal synchronizing signal separated by the synchronizing separation circuit 24 is supplied to the quaternary counter 35 to obtain a signal of four horizontal period periods. This four horizontal synchronizing signal is supplied to the switching position 34 as a control signal.

On the other hand, the output signal of the divider 40 is supplied to the phase shift circuit 41 and four clock signals whose phases are delayed by 1/4 clock period as shown in the output waveform diagram of FIG. 6 (the frequency is 5.37 MHz). Are generated, and these four clock signals are supplied to respective terminals of?,?,?, And? Of the changeover switch 34, respectively. The output signals selected as a, b, c, d in sequence every horizontal period by the control signal from the quaternary counter 35 are supplied to the AD converter 26 as a clock signal for sampling and the memory circuit 31 It is supplied as a clock signal for recording. The frequency of 5.37 MHz is 1365/4 times the horizontal frequency of the NTSC system, and the phase is shifted by 1/4 clock period every scan line and every frame.

If this is used as it is as a clock signal, it becomes a sampling pattern as shown in FIG. 7, and a spatial transition occurs. In the figure, 0 is the 4th Nth frame, X is the 4n + 1th, (triangle | delta) is a 4n + 2th, (square) is a sample position in a 4n + 3th frame.

Since the phase shift circuit 41 and the changeover switch 34 are provided, a 5.37 MHz signal out of phase by 1/4 clock period is used as the clock signal as described above. Is corrected. A voltage of 97.2 MHz is output from the voltage controlled oscillator 14, and this frequency signal is supplied to a frequency divider 15 having a dividing ratio 1/2, and a frequency of 48.6 MHz at this frequency divider 15. Signal is output. This signal is supplied to the memory circuit 31 as a clock signal for reading.

In the memory control circuit 25, as in the prior art (Japanese Patent Publication), on the basis of the interactive synchronization signal and the digestive image synchronization signal, the video signals for the interactive image and the digestive image are of the first field or the second field. Is determined. The reading from the memory circuit 31 is controlled as if it is done from the field memory on the side not being written. At this time, when the video signal SV1 is the second field based on the above-described determination result, and the video signal for the video image read out from the memory circuit 31 is the first field, the video signal for the video image is read. Is controlled to delay by one scan line.

The video signal SV3 for the digestive image read out from the memory circuit 31 is supplied to the insertion circuit 16. In the embedding circuit 16, the video signal SV3 for video images is replaced locally with the video signal SV1 for interactive video supplied from the MUSE decoder 13. As shown in FIG. The synthesized video signal output from this replacement circuit 16 is supplied to the time axis decompression circuit 17, and the time axis decompression of 12/11 is performed.

This is because the video signal SV1 output from the MUSE decoder 13 has a time axis compressed at 11/12. The synthesized video signal output from this time base extension circuit 17 is converted into an analog signal by the D / A converter 18. The converted analog signal is supplied to the water pipe 20 with the image amplifier circuit 19 interposed therebetween.

As a result, in the water pipe 20, a combined image in which part of the screen by the video signal SV1 is locally replaced by the video signal SV3 is displayed on the screen.

Incidentally, in the above embodiment, only the luminance signal has been described for the sake of simplicity, but the color signal is similarly processed. As described above, according to this example, the clock frequency read from the memory circuit 31 is 48.6 MHz, which coincides with the maximum clock frequency of the digital signal processing of the MUSE decoder. It can be displayed by replacing locally on the upper surface.

In this case, since a signal having a frequency of 3/2 times the phase shifted 3.58 MHz every 1/4 clock period is used as the clock signal for recording, spatial phase shift can be corrected. .

Incidentally, in the above-described embodiment, although the NTSC system is displayed as the standard system, the present invention can be similarly applied to a television display device employing the PAL system or the SECAM system.

By the way, the PinP TV receiver of FIG. 3 is as follows for the purpose of making the interlace relationship appropriate as in the conventional example (Japanese Patent Publication).

In other words, when the interactive TV signal is the second field and the digestive TV signal is the first field, the reading of the video image signal is delayed by one horizontal period. As a result, the problem that the position of the image is shifted by one horizontal scanning line is included. Consider the case of the combination of the HDTV system and the NTSC system. The field frequency of the currently adopted HDTV is 60 Hz, the field frequency of the NTSC system is 59.94 Hz DLAMFH, and the shift of one horizontal scan line causes deterioration in image quality.

PinP TV receivers that can solve this problem are shown in FIG. 8 and FIG.

However, the same reference numerals are given to portions overlapping with the third and fourth drawings, and description thereof is omitted. The output signal of the adder 30 (the video image signal for sub-images) is sequentially recorded in the three field memories 43, 44, and 45 constituting the memory circuit 42 one by one.

As described above, the video signal of the video area to be substituted (substituted) in part of the interactive area is read out from the three field memories 43, 44 and 45 in the memory circuit 42. The field of the video signal of the read picture area should be the field of the video signal of the picture area equal to the current field of the video signal of the interactive picture area. The three field memories are controlled by the memory control circuit 25 so that the read address does not precede the write address.

9 is a block diagram showing details of the memory control circuit 25.

The vertical synchronization signal for fire extinguishing is supplied as a clock input to the ternary counter 46, whereby the write memory selection signal is output. The write memory selection signal is supplied to the changeover switch 51 as a control signal to select the field memory to be recorded.

In addition, the write clock (second clock signal) obtained by the switching switch 34 with a quarter-clock cycle shifted phase and the digestive image synchronization signal are supplied to the write address generation circuit 53 to form a write address. The created write address is supplied to the specific field memory selected by the changeover switch 51 to record the video image signal.

The read clock (first clock signal) and the interactive synchronization signal obtained by the divider 15 are supplied to the read address generating circuit 54 so that the read address is generated therein and the generated read address is transferred to the changeover switch 52. Is supplied to the selected field memory to read out the video image signal.

The digestive synchronization signal is supplied to the field detection circuit 47 again, and the logic level L or H is outputted depending on whether the current field is the first field or the second field. The interactive synchronization signal is similarly supplied to the field detection circuit 48, and the logic level L or H is output by whether the current field is the first field or the second field.

Both of the digestive field detection signal and the interactive field detection signal are supplied to the exclusive logic circuit 49 to generate a field determination signal. This field determination signal is supplied to the read memory selection circuit 50 together with the write memory selection signal to generate the read memory selection signal.

The above-described changeover switch 52 is controlled by this read memory selection signal. The read memory selection circuit 50 can be configured by a ROM which uses the write memory selection signal and the field determination signal as address inputs.

Table 3 shows the truth table of this decision logic.

TABLE 3

Read Memory Selection Logic

As is apparent from Table 3, for example, when the recording memory is the field determination signal L in the field memory 43, i.e., the large picture image signal is the same polarity field (the same field), the field memory 44 is not being recorded. In 45, the field memory 44 of the interactive video signal and the same polarity field is selected as the read memory.

When the recording memory is the field determination signal H in the field memory 43, that is, the large picture signal is a bipolar field (another field), the interactive memory synchronization signal and the field memory of the same polarity field among the field memories 44 and 45 are used. 45 is selected as the read memory.

Thus, the read control can be performed by the memory selection logic for the following reasons. In other words, the video signals for the video images are sequentially stored in the field memories 43, 44 and 45 in units of three fields such as the first field, the second field, the first field, the second field, ... to be.

By performing this read processing, the first and second fields for the digested image to be inserted can be matched with the relationship between the first and second fields for the interactive image.

Therefore, the field frequency is increased due to the difference in the signal format of the large picture, such that the video signal for a conversation is a high-definition television signal (the field frequency is 60 Hz) and the video signal for the video is a current standard television signal (the field frequency is 59.95 Hz). In other cases, the image quality deterioration due to the positional shift of the image does not occur.

In this way, the video image signal read out from the memory circuit 42 is provided to the video image replacement circuit 16 as described above.

As described above, by configuring the memory circuit in the three-field memory, there is no need to perform interface correction such as delaying the reading of the video image signal by only one horizontal syringe.

Therefore, when the interactive video signal is a combination of two types, such as a video signal and a current television signal, in a high-definition television signal by local substitution of an image of another television signal, the difference between the small and large image signal modes Although the field frequency is different, the image quality deterioration due to the positional shift of the image can be significantly improved.

In addition, the memory control circuit 25 of FIG. 9 can be applied to a picture-in-picture receiver in which picture signals are displayed as picture-in-picture images according to a standard method. As a result, the drawback of position shift for one horizontal scanning line can be eliminated. You can get rid of it.

Although the invention has been described in detail, the spirit or scope of the invention is not limited by the examples, the description or the claims.

Claims (11)

First television signal receiving means (11 to 13) for receiving a first television signal of a first color television standard system including a horizontal synchronizing signal and a vertical synchronization signal of a rating specified by the first color television standard system; And a second television signal receiving a second television signal of a second color television standard system including a horizontal synchronization signal, a vertical synchronization signal color burst signal, a video signal, and a color signal of a rating specified by the second color television standard system. Television signal receiving means 21 to 23 and the first and second television signal receiving means 11 to 13 and 21 to 23, respectively, to display images of the first and second television signals. In the interactive display area of the image display means 17 to 20 and the screen of the image display means 17 to 20, the image by the first television signal is displayed, and the image in the interactive area is displayed. In the image area, the image by the second television signal which locally replaces the image by the first television signal is displayed, whereby the image by the second television signal is displayed on the image by the first television signal. And a composite image display control means for displaying a composite image to be fitted on the screen of the image display means, wherein the composite image display control means includes a horizontal synchronizing signal and a vertical synchronizing signal included in the first television signal. L / K times (K, L) of the color carriers in synchronization with the first clock signal generating means (14) for generating the first clock signal correlated with the color burst signal included in the second television signal. Is a natural number based on the second clock generating means (37 to 40) for generating a second clock signal having a frequency of K? Scanning player converting means (28 to 30) for converting the number of signal scanning lines of the two television signals into a number in which the scanning lines of the image of the first television signal in the interactive area are included in the height of the digesting area; A plurality of columns of one recording clock signal in which the second clock signal is shifted in phase by the clock period selected to correct a phase shift between the period of the second clock signal and the scanning period of the second television signal every one horizontal period; The recording clock generating means (35, 40, 41) and the second video signal from the scanning player converting means (28-30) are generated by the recording clock signal from the recording clock generation number (35, 40, 41). Memory means 25, 31, 43-45 which are written in response to and read in response to the first clock signal and second television signals read out by the memory means 25, 31, 43-45. Correlating to the video signal A television display device having a picture-in-picture display function, comprising: a replacement means (16) for substituting part of a video signal included in the television signal of (1). 2. The horizontal synchronizing signal according to claim 1, wherein said first clock generating means is coupled to said first television receiving means (11 to 13) and is included in a first television signal from said first television receiving means. And a voltage controlled oscillator (14) for generating a clock signal in phase synchronization with the vertical synchronizing signal. 2. The phase lock loop as set forth in claim 1, wherein the second clock signal generating means (37 to 39) phase-locks a color burst signal included in the second television signal to a frequency L times the color carrier. a picture-in-picture display function comprising a means (37,38) and 1 / K division means (39) for dividing the phase-synchronized signal generated by the phase lock loop means (37,38) by 1 / K. TV display. 2. The recording clock generating means (35, 40, 41) according to claim 1, wherein the recording clock generating means (35, 40, 41) performs the period of the second clock signal and the horizontal scanning of the second television signal every one horizontal period. Phase shifting means (40,41) coupled to the phase shifting means (40,41) for shifting by a predetermined phase of a clock period selected to correct a phase shift with the period to generate a plurality of clock signal sequences different from each other by a predetermined phase; And selecting means (35) for selecting, for each scan line, one of the plurality of clock signal strings obtained from the phase shift means in response to a horizontal synchronizing signal included in the second television signal, and having a picture-in-picture display function. Display. The video signal between the preceding syringes and the current horizontal scan which are delayed by one horizontal syringe in response to the horizontal synchronizing signal included in the second television signal. Two coefficient multiplying means (28,29) for multiplying different coefficients to the video signal of the period, and adding means (30) for adding two multiplication values from the coefficient multiplying means (28,29); A television display device having a picture-in-picture display function. 2. An image according to claim 1, wherein said memory means (25, 31, 43-45) are included in a second television signal in response to a period of a write clock generated from said write clock generating means (35, 40, 41). Three field memories (31, 43 to 45) in which a signal is written and read out from the recorded video signal in response to a period of the first clock signal generated from the first clock signal generating means (14); First field detection means 48 for detecting whether the video signal of the interactive area currently being scanned is a first field or a second field based on the horizontal synchronizing signal and the vertical synchronizing signal included in the first television signal. And a second detecting whether the second video signal currently being recorded is in the first field or the second field based on the horizontal synchronizing signal and the vertical synchronizing signal included in the second television signal. Field detection means 47, and In response to the determination signals of the first and second field detection means 47 and 48, the three fields of memory 31, 43 to 45 are the same fields as the first video signal currently being scanned and A picture display apparatus having a picture-in-picture display function comprising read memory selecting means (50) for selecting a field memory not being recorded. First television signal receiving means (11 to 13) for receiving a first television signal of a first color television standard system including a horizontal synchronizing signal and a vertical synchronization signal of a rating specified by the first color television standard system; And a second television signal receiving a second television signal of a second color television standard system including a horizontal synchronization signal, a vertical synchronization signal color burst signal, a video signal, and a color signal of a rating specified by the second color television standard system. The first and second television signal receiving means 21 to 23, and the first and second television signal receiving means 11 to 13, 21 to 23, respectively. A television display device comprising image display means (17 to 20) for displaying an image of two television signals, wherein the first television signal is displayed in the interactive area of the screen of the image display means. Displaying an image and displaying an image by a second television signal which locally replaces the image by the first television signal in the digestion region in the interactive region, whereby the image by the first television signal A method of displaying a composite image into which this image is inserted on a screen of said image display means, wherein L / K times of color carriers (KL is a natural number) in synchronization with a color burst signal included in said second television signal. Generating a clock signal having a frequency of K? L) and selecting the clock signal to correct a phase shift with the period of horizontal scanning of the second television signal every one horizontal period of the second television signal. Generating a plurality of columns of the recording signal, which are sequentially shifted in phase by a predetermined phase in a clock cycle, and included in the first television signal; Is a step generated by the read clock signal correlated with the horizontal synchronizing signal and the vertical synchronizing signal, and the number of scanning lines of the second television signal is converted into the interactive region based on the ratio of the height of the interactive region and the height of the digest region. Converting the scanning line of the image of the first television signal in the number contained within the height of the digestion region, recording the second video signal in the field memory in response to the period of the recording clock signal; Reading a second video signal from a field memory from a field memory in response to the period of the read clock signal, and outputting a video signal correlated with a second television signal read from the field memory to the first television signal. Picture-in-picture in a television display device having a picture-in-picture display function comprising steps of substituting a part of a video signal included Specifications law. First television signal receiving means (11 to 13) for receiving a first television signal of a first television standard system including a first synchronization signal and a video signal of a rating defined by the first television standard system; A second synchronizing signal and a video signal comprising a second synchronizing signal and a video signal of a rating specified by a second television standard system, including a second synchronizing signal and a video signal of a rating specified by a second color television standard system; A second television signal receiving means (21 to 23) for receiving a second television signal of a television standard type, and the first and second television signal receiving means, the first and second television signals being Image display means (17 to 20) for displaying an image, and the first television signal in the interactive area on the screen of the image display means (17 to 20) to display an image, and to display the first tell. Fire-extinguishing image in an interactive region in which the image of the first television signal is locally substituted for displaying a composite image having the image of the second television signal set on the image of the vision signal on the screen of the image display means. A composite image display control means for displaying an image by said second television signal in said area, said composite image display control means being synchronized with a second synchronizing signal included in said second television signal; Means for generating a signal; means for generating a read clock signal in synchronization with a first synchronization signal included in said first television signal; and said second recorded therein in accordance with a period of said generated clock clock signal. A video signal having a video signal contained in a television signal and also read and recorded therefrom in accordance with a period of the generated read clock signal. Three field memories 43 to 45 each having first field detection means 48 for detecting whether a video signal included in the first television signal is a first field or a second field; Second field detection means 47 for detecting whether a video signal included in the two television signals is a first field or a second field, and detection provided by the first and second field detection means 47,48. Means 50 for selecting a field memory which is not currently being recorded in said three field memories 43-45 and which has a same field as the field of said first video signal currently being scanned in response to the signal; TV display. The television display apparatus according to claim 8, wherein said first television standard system is the same as said second television standard system. 10. The television display of claim 8 wherein the field frequency of the first television standard is essentially the same as the frequency of the second television standard. First television signal receiving means (11 to 13) for receiving a first television signal of a first television standard system including a video signal of a rating defined by the first television standard system and a first synchronization signal; And second television signal receiving means (21) for receiving a second television signal of a second television standard system including a video signal of a rating specified by the second television standard system and a second synchronization signal. 23, image display means 17 to 20 coupled to the first and second television signal receiving means for displaying images of the first and second television signals, and a screen of the image display means. The image display means (17 to 20) to display a composite image on the image by the first television signal in the interactive area, and having the image of the second television signal positioned in the image of the first television signal. A composite image display control means for displaying an image by said second television signal of a digestion region in said interactive region while locally replacing the image of said first television signal for displaying, said composite image display The control means includes means (35, 40, 41) for generating a recording clock signal in synchronization with a second synchronization signal included in the second television signal, and a first synchronization signal included in the first television signal. Means (14,15) for generating a read clock signal in synchronism with the first and second television signals; Scanning player converting means 28 to 30 for converting the scanning player of the image of the signal into a number corresponding to the height of the digestive region, and the scanning recorded therein as a period of the generated recording clock signal. Three field memories 43 to 45 each having the video signal provided from the means 28 to 30 and having the write video signal read therefrom as a period of the generated read clock signal, and the first television. First field detecting means 48 for detecting whether a video signal included in the signal is a signal of a first field or a second field, and a video signal contained in the second television signal is a first field or a first. It is not currently being recorded in response to the detection signal provided from the second field detection means 47 and the second frame detection means 47 and the first frame detection means 48 for detecting whether it is the second field signal. And means (50) for selecting from the field memories (43 to 45) a field memory having the same field as the video signal contained in the first television signal being scanned.

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