KR0152856B1 - Multi-screen ghost cancelling method and apparatus - Google Patents

Abstract

The present invention relates to a multi-screen corresponding ghost removal method and a device thereof. In the related art, an ghost removed image is displayed only on the main screen, and a remaining screen or sub-screen is displayed on the screen where ghost is not removed. It caused the deterioration of the. In order to improve this point, the present invention has been devised to display each screen as a ghost-removed screen when displaying a multi-screen such as PIP or POP, and the present invention removes ghost components from each input signal when the multi-screen is on. It is possible to prevent deterioration of image quality and to improve the ghost removal performance of the main signal by cascading N digital filters in the case of multi-screen off.

Description

Multiple screen ghost removal method and device

1 is a block diagram of a conventional magnetic screen processing apparatus.

2 is a block diagram of a conventional ghost removal apparatus.

3 is a block diagram of a conventional ghost removing function built-in screen processing apparatus.

4 is a signal flow diagram for conventional ghost cancellation.

5 is a block diagram of a multi-screen ghost removing apparatus of the present invention.

FIG. 6 is an exemplary diagram illustrating generation of a filter enable signal in FIG.

7 is a block diagram showing digital filter partitioning in FIG.

8 is a signal flow diagram for removing the multi-screen corresponding ghost of the present invention.

* Explanation of symbols for main parts of the drawings

501,508,519 ~ 524: Switch 502,503,504: A / D converter

505: synchronization separation and clock generator 506: timing generator

507: First-in, first-out memory 509: Digital signal processing unit

510: RAM 511: ROM

512: microcomputer 513,514,515: D / A converter

516,517,518: Digital Filter

The present invention relates to a ghost elimination technology of a multi-screen TV system, and more particularly, to a multi-screen corresponding ghost elimination method and apparatus for improving overall image quality by displaying each screen as a ghost-free screen when the multi-screen is displayed. It is about.

Multi-screen refers to the display of multiple sources by dividing the TV screen into several areas. For example, there are various types such as PIP, POP 3 screen POP, and 9 screen TV.

The picture in picture (PIP) is a display function in which a part of a screen is divided by a picture display device to display another picture on the main picture, and a high frequency (RF) signal or an external device signal can be simultaneously viewed.

The conventional magnetic screen processing apparatus includes an A / D converter 101 for converting an analog video signal into a digital signal as shown in FIG. 1, and a synchronization and clock generator 102 for generating a synchronization signal and a clock for performing the magnetic screen processing. ), And a sub picture processing unit 103 which processes and edits the digital picture data into a sub picture signal by the synchronization signal and clock, and digital signals of the sub picture image processed by the sub picture processing unit 103 as analog signals. The D / A converter 104 for converting, the signal synthesizing unit 105 for synthesizing the main video signal and the sub-screen video signal of the D / A converter 104, and the sub-screen image to be superimposed on the main image. It is composed of a sub picture control unit 106 that controls the signal synthesizing unit 105.

In addition, a ghost phenomenon occurs in the TV, which means that the TV signal transmitted from a broadcasting station is reflected by a mountain or a building, and merges with a main signal so that an image overlaps twice on the TV screen.

In order to remove such ghost phenomenon, a ghost canceller is adopted. When a GCR (Ghost Canceller Reference) signal, which is a reference signal that can remove ghost on a specific line, is detected and transmitted from a broadcast station, the ghost canceller receives a reference signal (GCR). Signal) is stored in the first-in, first-out memory inside, and the ghost component is extracted by comparing with the received GCR signal, and then the coefficient value to remove the ghost is calculated and filtered by the internal digital filter. Will be removed.

As shown in FIG. 2, a conventional ghost eliminator separates an A / D converter 201 for digital signal processing and an synchronous separation and clock for receiving an analog image signal and generating vertical synchronization, horizontal synchronization signals and clock signals. A generator 202, a timing generator 203 for generating various timing signals required for the ghost eliminator, a first-in first-out memory 204 for storing data of a specific section of the input signals, and calculated filter coefficients A digital filter 205 for removing ghost components by values, a D / A converter 206 for converting a digital video signal from which ghosts have been removed by the digital filter 205 into an analog signal, and analyzing ghost removal A digital signal processing unit 207 for obtaining filter coefficient values for the memory, a ROM for storing a program and a GCR signal for ghost elimination, and a data RAM for operation of the ghost eliminator. 208, a microcomputer 210 for controlling the operation of the ghost eliminator, and a signal switching unit 211 for switching the video signal passing through the ghost eliminator and the non-passing video signal.

The conventional magnetic screen processing apparatus with a ghost elimination function is composed of the combination of FIG. 1 and FIG.

That is, a divider 302 for distributing the high frequency signal RF received at the antenna 301, tuners 303 and 304 for tuning the output frequency of the divider 302, and this tuner 303 and 304 Sub-screen processing unit 305 and 306 for converting the output high-frequency signal to the intermediate frequency signal IF and the high-frequency signal input from the external device signal and the inter-frequency processing unit 305 on the sub-screen The control unit 308, the ghost removal unit 309 for removing ghost components among the high frequency signals input from the intermediate frequency processing unit 306, and the A / V switching unit for selecting the main and sub picture among the external device signal and the high frequency signal ( 310, a microcomputer 307 for generating a tuner control signal, an intermediate frequency control signal, a sub picture control signal, a ghost elimination control signal, and an A / V switching control signal, which are various control signals required for a TV system, Main output from the A / V switching unit 310 No. and characters consists of the screen signals to be correlated 313, image signal processor 311, 312 for respectively converting a video signal to display on.

Referring to the operation of the conventional device as follows.

When the high frequency signal received from the antenna 301 is distributed by the distributor 302 and input to the tuners 303 and 304, the tuner 303 and 304 are tuner control signals supplied from the microcomputer 307. By tuning the corresponding frequency, respectively, and transmits to the intermediate frequency processing unit (305, 306).

The intermediate frequency processing unit 305, 306 converts the image high frequency signals inputted from the tuners 303 and 304 into the intermediate frequency signal by the intermediate frequency control signal of the microcomputer 307, and then the sub picture control unit 308. ) And the ghost removal unit 309.

The magnetic screen controller 308 receives the magnetic screen control signal of the microcomputer 307 and processes the image signal input from the intermediate frequency processor 305 or an external terminal, and the ghost removing unit 309 is the intermediate frequency processor. When the ghost component of the main video signal input at 306 is removed, the input signal is input to the A / V switching unit 310.

The A / V switching unit 310 is controlled by the A / V switching control signal input from the microcomputer 307 to control the screen selection and the image source.

The main signal output from the A / V switching unit 310 is input to the image signal processing unit 311 and the sub-screen signal is input to the image signal processing unit 312 and processed respectively, and then is output to the water pipe 313. Lose.

The water pipe 313 displays the main image and the sub-screen image at the same time.

The ghost removal operation is performed as shown in the signal flow diagram of FIG. 4 in the ghost removal unit 309 configured as shown in FIG.

First, when the power is turned on or the TV channel is changed, the microcomputer 210 outputs the digital signal processing control signal so that the digital signal processing unit 207 is reset and initialization of the ghost removal operation is performed. Of the digitally changed image data at, only the GCR component is written to the first-in first-out memory 204.

The control signal for writing only the GCR component in the first-in first-out memory 204 is controlled by the synchronous separation and clock generator 202 and the timing generator 203.

That is, the synchronization separation and clock generator 202 inputs the clock signal locked to the vertical and horizontal synchronization signals and the color carriers among the analog video signals to the timing generator 203. Only the GCR data is stored by comparing and analyzing these input signals to find a predetermined GCR section and applying a write control signal / WE to the first-in first-out memory 204.

The timing generator 203 multiplies and supplies the clock signal inputted from the synchronous separation and clock generator 202 to a clock frequency required for each block 201, 205, 206, and 204 of the ghost eliminator.

In addition, when the timing generator 203 outputs a control signal for digital signal processing, the digital signal processor 207 checks the process, vertical, horizontal synchronization signal, and clock of the timing generator 203 among the control signals. A check of the signal allows you to decide whether to read the input data or reset the system.

When the digital signal processor 207 analyzes the control signal for processing the digital signal input from the timing generator 203 and determines that the signal is normal, the digital signal processor 207 outputs a read control signal (/ RF) to the first-in, first-out memory 204 and stores the GCR. The data is read.

Thereafter, the digital signal processing unit 207 checks the data read from the first-in first-out memory 204 by the program stored in the ROM 209 and compares the ghost elimination by comparing the ghostless GCR data stored in the ROM 209. The filter coefficient is calculated and the calculated coefficient is checked. If there is no abnormality, the filter coefficient is output to the digital filter 205.

In addition, the digital signal processing unit 207 determines whether GCR data is included in a normally defined section in the input data checking process, and also checks the filter coefficients to perform coefficient checks to prevent image degradation during severe ghosting over a specific range. The control signal according to whether it can be removed or not is fed back to the microcomputer 210.

The digital filter 205 removes the ghost by applying an appropriate operation to the ghost position by the address data of the coefficient data input from the digital signal processor 207 and outputs the ghost to the D / A converter 206.

The D / A converter 206 converts the ghost-free digital video signal into an analog signal and outputs it to the switch 211.

The switch 211 is controlled by the microcomputer 210, and switches the signal passing through and not passing through the ghost eliminator by ON / OFF control of the ghost eliminator.

When the above process is completed, one ghost removal operation is completed, and in order to remove ghost from the next input signal, the digital signal processor 207 changes the error of the signal read from the first-in first-out memory 204 and the ghost situation. In order to cope with, the coefficients are recalculated through a wait state process for coefficient updating, and the updated coefficient values are input to the digital filter 205.

However, in the conventional multi-screen TV, the ghost removal operation displays the ghost removed image only for the main screen, and the remaining screen or sub-screen is displayed without the ghost removed, causing unbalance of image quality and deterioration of the overall image quality. It became.

According to the present invention, the current main signal is only removed from the ghost in the conventional multi-screen TV, and the ghost is not removed from the main screen. The purpose of the present invention is to provide a ghost elimination method and apparatus for multi-screen TV which improves the overall image quality by displaying each screen as a ghost-removed screen when displaying a multi-screen such as PIP or POP.

In order to achieve the above object, the present invention provides a method for determining whether the filter coefficients calculated from the input data are abnormal after system initialization, and determining whether the filter coefficients are in the multi-screen off mode if the filter coefficients are not abnormal in the above step. De-ghosting the filter coefficients calculated in the multi-screen off mode, recalculating the filter coefficients to determine whether the filter coefficients are abnormal, and sequentially selecting input signals in the multi-screen on mode. And calculating the filter coefficients by adjusting the address data and determining whether the filter coefficients are abnormal.

In addition, the present invention is the first signal input means for sequentially selecting the N input signals to perform the above steps, and the horizontal and vertical synchronization signal with respect to the input signal of the first signal input means and the clock Synchronizing separation and clock generating means for generating a signal, timing generating means for generating N clock signals by receiving the horizontal and vertical synchronizing signals of the synchronization separating and clock generating means and clocks for system operation; N A / D conversion means for digitally converting the N input signals based on a clock signal, second signal input means for sequentially selecting outputs of the N A / D conversion means, and the second signal First-in, first-out memory for storing the ghost elimination reference signal GCR among the outputs of the input means, and ghost elimination reference signal GCR stored in the first-in, first-out memory to calculate the ghost elimination. Digital signal processing means for generating address data and filter coefficients for the < RTI ID = 0.0 > and < / RTI > (N-1) switches for respectively selecting (N-1) output signals of the N A / D conversion means when the screen is on; N digital filter means for removing ghosts mixed in the outputs of the N A / D conversion means with filter coefficients and address data of the digital signal processing means, and the outputs of the N digital filter means when multiple screens are selected, respectively. Analog conversion between N switches for connecting the last stage and the first stage when the multi-screen is off, (N-1) switches for cascading the N digital filter means when the multi-screen is off, and the outputs of the N digital filter means. Microcomputer to control the ghost elimination operation by outputting a multi-screen control signal to the digital signal processing means according to the N D / A conversion means and the user's key input. It is composed of.

The N digital filter means are one digital filter which is divided into several areas by the address of the digital signal processing means to remove ghosts.

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

An embodiment of the present invention is shown in FIG. 5 and its control method is shown in the signal flow diagram in FIG.

FIG. 6 shows the generation of a filter enable signal that enables the digital filter, and FIG. 7 shows a method of dividing the digital filter, which is important in ghost elimination during multi-screen operation.

According to an exemplary embodiment of the present invention, as shown in FIG. 5, N A / D converters 502, 503, 504 for digital conversion in response to each of the input signals IN ₁ to IN _N , and N digital filters for removing ghosts. 516, 517, 518, a switch 501 for switching N analog video signals, and a synchronous separation and clock generator for separating output signals of the switch 501 from horizontal and vertical sync signals and clock signals suitable for respective input characteristics. And a clock signal CLK1 to CLKN, a write control signal / WE, and a digital signal, which are timing signals required for the multi-input ghost elimination operation by receiving the output signals of the synchronous separation and clock generator 505. A timing section 506 for generating a signal processing control signal, a switch 508 for switching the output signals of the N A / D converters 502, 503, 504, and a specific section among the signal sources selected by the switch 508; To store GCR data A first-in-first-out memory 507 and a digital signal processor for generating address data related to a ghost removal coefficient and a ghost position, a filter enable signal (/ FE), a switching control signal, and a read control signal (/ RE). 509, a ROM 511 for storing a program for removing ghost and GCR data, a RAM 510 for storing data for ghost removing, and a user's information to the digital signal processor 509. And a microcomputer 512 which receives the feedback signal F / B of the digital signal processor 509 and informs the user, and a D / A converter which converts the ghost-free digital video signal of each signal into an analog signal ( 513,514,515, switches 520,519 for switching the output signals of the A / D converters 503,502 to the digital filters 517,518 or D / A converters 514,513, and the N digital filters 516,517,518 when multiple screens are off. ) And switches 521 and 524 for switching to connect sequentially, and switches 522 and 523 for switching the output signals of the digital filters 517 and 518 to the D / A converters 514 and 513. FIG.

The switches 501, 508, 519, 520, 521, 522, 523, 524 are controlled by the digital signal processor 509 to perform a switching operation corresponding to an input source.

The digital filters 516, 517, and 518 may perform filtering on each signal source by the switching operations of the switches 519, 520, 521, 523, and 524, or may filter only one signal by the cascade connection.

Referring to the operation and effect of the embodiment of the present invention configured as described above are as follows.

First, when the switch 501 switches by the switching control signal of the digital signal processor 509, each input signal IN _{1 to} IN _N is sequentially selected and input to the synchronous separation and clock generator 505. Lose.

When the respective input signals IN ₁ to IN _N are input, the synchronous separation and clock generator 505 generates horizontal and vertical sync signals and clocks suitable for each input characteristic and outputs them to the timing generator 506. .

The timing generator 506 compares and analyzes these input signals to generate clocks CLK1 to CLKN necessary for the ghost elimination operation, and provides a write control signal / WE to the first-in first-out memory 507 to provide a specific section. Only data is stored in the first-in, first-out memory 507, and the control signal for digital signal processing is supplied to the digital signal processing unit 509 so that the digital signal processing unit 509 provides filter coefficients for checking timing signals and removing ghosts. Ask for help.

At this time, the A / D converter 504 converts an analog video signal, which is an input signal, into a digital signal locked to the clock CLK1 and supplies it to the digital filter 516, and the switch 508 is connected to the digital signal processor 509. Since the digital signal of the A / D converter 504 is selected by the control, only the line (GCR signal data) of a specific section is stored in the first-in, first-out memory 507.

When the A / D converters 502 and 503, which are supplied with the clocks CLK2 to CLKN from the timing generator 506, respectively, digitally convert each input signal, the digital image signal is converted into a digital filter by the switching operation of the switches 519 and 520. 518,517 or D / A converters 513,514.

In this case, the switch 508 operates in correlation with the switches 519 and 520 by the switching control signal of the digital signal processing unit 509 to select only one signal among the outputs of the A / D converters 504, 503 and 502 to select the first-in first-out memory ( 507).

The first-in-first-out memory 507 stores only specific section data (GCR data) by the write control signal / WE of the timing generator 506, and then read control signal (/ RE) of the digital signal processor 509. By the digital signal processor 509.

The digital signal processor 509 controls the operation by the digital signal processing control signal of the microcomputer 512. When the operation signal is input, the digital signal processor 509 checks the control signal for processing the digital signal of the timing generator 506. If not, the GCR data of the first-in, first-out memory 507 is compared with the GCR data contained in the ROM 511 to calculate a coefficient value capable of removing ghosts.

The digital signal processor 509 generates a switching control signal for controlling the switches 501, 508, 519, 520, 521, 522, 523, 524 by the multi-screen on / off signal input from the microcomputer 512, and the filter enable signal (/ FE) and the address. Data, coefficient data, and the like are adaptively supplied to the N digital filters 516, 517, and 518.

Generation of the filter enable signal (/ FE) by the digital signal processing unit 509 is performed by allocating an appropriate bit from the address data when performing the digital signal processing 601, as shown in FIG. By generating the filter enable signal (F / E1-F / EN) that can operate each digital filter.

Therefore, when the multi-screen ON operation is set by the control of the microcomputer 512, the digital signal processing unit 509 selects each signal source IN ₁ to IN _N to the N digital filters 516, 517 and 518, respectively. A switching control signal is output to supply and address data and coefficient data corresponding to each of the N digital filters 516, 517, and 518 are supplied.

That is, when the screen is on, the digital signal processing unit 509 sequentially calculates the count data by sequentially storing the first to Nth signals in the first-in first-out memory 507 by the switching operation of the switch 508. After storing at 510, the N digital filters 516, 517, and 518 are output to the N digital filters 516, 517, and 518.

Here, the output signals of the digital filters 518 and 517 are input to the D / A converters 513 and 514 by the switching operations of the switches 519, 520, 523 and 522, and the D / A converter 515 is switched by the switching operations of the switch 521. The output signal of the digital filter 516 is input.

Accordingly, the N digital filters 516, 517, and 518 filter to the ghost position and size by the address data and the coefficient data of the digital signal processor 509 to remove ghosts from each signal, and the ghosts are removed. The D / A converters 513, 514, and 515 are outputted as ghost-free analog signals, respectively.

Conversely, when the multi-screen off operation is set by the microcomputer 512, the digital signal processing unit 509 switches the switches 521, 524 to connect the N digital filters 516, 517, 518 to the cascade connection.

Here, the D / A converters 513 and 514 receive signals from the A / D converters 502 and 503 by the switching operations of the switches 519, 520, 523 and 522, and the D / A converters 515 receive N by the switching operations of the switches 521, 520, 519, 523 and 522. The filtered signal is sequentially input through the two digital filters 516, 517, and 518.

Accordingly, the output signal of the A / D converter 504 is sequentially filtered through the N digital filters 516, 517, and 518, and then an analog signal from which ghost is removed is output from the D / A converter 515.

On the other hand, the method of dividing the digital filter for removing the ghost as shown in Figure 7, the data input terminal (IN), cascade input terminal (CI), cascade output terminal (N) in each of the independent N digital filters (701, 702, 703) CO) and the signal output terminal OUT may be switched by the switching control signal of the digital signal processing unit 509.

That is, when the multi-screen is on, the switch 705 selects the output terminal OUT of the digital filter 701 in which the signal of the A / D converter 711 is input to the terminal IN and the cascade input terminal CI is grounded. Output to the D / A converter 714, the switch 706 selects and filters the output signal of the A / D converter 712 to the input terminal IN of the digital filter 702, and switches 707 Inputs the output OUT of the digital filter 702 to the D / A converter 705, and a switch 709 is connected to the data input terminal IN of the digital filter 703 at the last stage. The output signal of 713 is selected and supplied, and the output OUT of the digital filter 703 is input to the D / A converter 716.

The switches 704 and 708 are connected to the ground side to ground the cascade input terminal CI of the digital filters 702 and 703, and the cascade output terminal CO of the digital filters 701, 702 and 703 is opened.

Accordingly, by performing the multi-screen division as described above, the signals filtered by the D / A converters 714, 715, and 716 are output.

On the contrary, when the multi-screen is off, the switches 704 and 708 switch to the cascade output terminal CO of the digital filters 701 and 702 and the switch 705 is connected to the output terminal OUT of the digital filter 703. Switch to the

That is, the cascade output CO of the digital filter 701 is connected to the cascade input terminal CI of the digital filter 702, and the input cascade output CO is sequentially connected to the cascade input CI of the next filter. Supply.

As a result, the output signal of the A / D converter 711 is sequentially supplied to the D / A converter 714 through the N digital filters 701, 702, and 703, thereby improving the ghost removal performance.

In addition, referring to FIG. 8, the multi-screen corresponding ghost elimination operation is reset by the digital signal processing control signal of the microcomputer 512, and the digital signal processing unit 509 is reset (801) to perform system initialization ( 802).

Thereafter, the control unit for digital signal processing of the timing generator 506 is analyzed to check whether there is an error in timing signal generation (803). If there is no error, the following process is performed. Repeat.

If there is no abnormality in the timing signal generation, the stored data of the first-in-first-out memory 507 is read (804), and it is checked whether the input data matches the data stored in the ROM 511 (i.e., GCR data) (805). If there is a match, a filter coefficient operation 806 is performed by performing the following process, and if not, the system initialization operation 802 is repeated again.

When the filter coefficient calculation 806 is finished, it is checked whether the coefficient is abnormal, that is, whether it is out of a predetermined ghost elimination range size (807). If there is no error, the multi-screen off is determined (808). The system initialization operation 802 is repeated.

On the other hand, if an abnormality is determined by determining whether the timing is abnormal (803), the input data is abnormal (805), or the filter coefficient is abnormal (806), the system initialization operation (802) is repeated and the feedback is returned to the microcomputer (512). A signal (F / B) is provided to inform the user of the malfunction status of ghost removal.

When the multi-screen is off, the digital signal processor 509 transfers the calculated filter coefficients to all N digital filters 516, 517 and 518 (809). The address data and the coefficient data are adapted to the cascade connection of the digital filters 516, 517 and 518. It is adjusted to pass coefficients.

Thereafter, in the wait state, the input data is analyzed to update the coefficients, the coefficients are calculated through the coefficient recalculation operation 811, and the process is performed to determine whether the filter coefficients are abnormal. It will improve performance.

In addition, when the screen is on, the number i of the input terminals is increased by one to obtain the coefficient of another signal source (812), and the filter coefficient (x) is obtained and stored in the first-in first-out memory 507 (813).

Then, the address data for dividing the N digital filters 516, 517, 518 is adjusted (814), the coefficient data corresponding to the signal source is passed to the corresponding digital filter to remove the ghost, and it is determined whether 'i' is 'N'. If it matches, in step 817 of setting 'i' to 1, a calculation corresponding to the number of multiple screens is performed, and then the switching 818 of the switch is controlled.

Then, the control unit switches back to operation 803 for determining whether the timing signal is abnormal while controlling the switching of the switch, and repeats the above operation, thereby performing the ghost removal operation for the multi-screen.

As described in detail above, the present invention removes ghost components from each input signal when multi-screen is on, thereby preventing deterioration of the overall image quality, and when multi-screen is off, cascading N digital filters to cascade the main signal to remove ghosts. It is effective to improve the function.

Claims (10)

A first step of determining whether the filter coefficients calculated from the input data are abnormal; a second step of determining whether the filter coefficients are abnormal in the first step; In step 3, a first screen ghost removal step of performing ghost removal with the filter coefficients calculated in step 2 and recomputing the filter coefficients after a predetermined time delay, and ghost removal operation for each screen in the second screen on mode. The multi-screen corresponding ghost removal method characterized in that the fourth step of performing a multi-screen ghost removal step. The method of claim 1, wherein the first step comprises: a first step of determining whether there is no abnormality in the generation of the timing signal; a second step of determining whether or not the input data is abnormal if the timing signal is not abnormally generated in the first step; In step 2, if there is no abnormality in the input data, the third process of determining whether or not an abnormality is generated by calculating a filter coefficient for the input data; and if the abnormality occurs in each of the above processes, the fourth process of informing the abnormal state while performing system initialization. Multi-screen corresponding ghost removal method characterized in that made. The ghost elimination method according to claim 1, wherein the ghost elimination operation of the third stage is performed by a digital filter divided into N regions by address data. The method of claim 1, wherein the fourth step includes selecting a next input signal to calculate filter coefficients and adjusting address data, and transmitting a filter coefficient calculated in the first process to perform ghost removal. And a third process of determining whether the signal of the N (N is 2 or more) screen and the process until the signal of the N screen is returned to the first step if it is not the signal of the N screen. And a fifth process of repeating a fourth process of setting a signal from the first screen if the signal of the Nth screen is selected and then returning to the first step. A first signal input means for sequentially selecting N input signals, a synchronous separation and clock generation means for separating a horizontal and vertical sync signal with respect to an input signal of the first signal input means, and generating a clock; Timing generating means for receiving the horizontal and vertical synchronizing signals of the synchronization separating and clock generating means and a clock for system operation, and generating N clock signals; and the N input signals based on the clock signal of the timing generating means, respectively. N A / D conversion means for digital conversion, second signal input means for sequentially selecting outputs of the N A / D conversion means, and ghost removal reference signal (GCR) among the outputs of the second signal input means. And a digital signal for calculating address data and filter coefficients for ghost cancellation by computing a ghost cancellation reference signal (GCR) stored in the memory means. N digital filter means for removing ghosts mixed into the outputs of the N A / D conversion means by the processing means, the filter coefficients and the address data of the digital signal processing means, and the analog conversion of the output of the digital filter means. And a D / A conversion means and a microcomputer for outputting a multi-screen control signal to the digital signal processing means in accordance with a user's key input to control the ghost elimination operation. A plurality of first switch means for outputting the output of the plurality of A / D conversion means to the plurality of digital filter means when the multi-screen on, and to each of the plurality of D / A conversion means when the multi-screen off, A plurality of second switch means for connecting the plurality of digital filter means by cascade when the multi-screen is off, and outputs the outputs of the plurality of digital filter means to the plurality of D / A conversion means, respectively when the multi-screen is on, and when the multi-screen is off And a plurality of third switch means for outputting the cascade-connected last digital filter means to the first stage D / A conversion means. 7. The multi-screen corresponding ghost elimination device according to claim 5 or 6, wherein the N digital filter means are one digital filter in which N ghost elimination areas are divided by address data of the digital signal processing means. The ghost elimination method according to claim 1, further comprising an initialization step of initializing the system before performing the first step. The method of claim 1, wherein after the third step of removing the first screen ghost, a step of returning to the first step of determining whether the filter coefficient calculated from the input data is abnormal is performed. . The method according to claim 1, wherein after the fourth step, the multi-screen ghost removal step, returning to the first step is performed.