JPH0795537A - Drop-out compensator - Google Patents

Abstract

PURPOSE:To perform satisfactory drop-out compesation while simplifying circuit scale and preventing complement due to continuous reproduced images or unnatural reproduced images with time deviation. CONSTITUTION:When drop-out is not generated, a switching circuit 22B is changed over to an FM demodulator 20 and the output is supplied to a temporary de-emphasis device 24. When the drop-out is detected, the output of a frame memory 24B is selected at the switching circuit 22B and this output is supplied to the temporary de-emphasis device 24. Namely, the frame memory 24B of the temporary de-emphasis device 24 is used in place of a frame memory used for storing complementary data in the case of drop-out compensation. Therefore, the frame memory on the side of the drop-out compensator is unnecessitated, and the circuit scale is simplified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dropout compensating device such as a VTR for compensating for a signal missing due to dropout.

[0002]

2. Description of the Related Art A VTR has a basic structure as shown in FIG. 7, for example. First, the recording system will be described with reference to FIG. 1A. The video signal to be recorded is supplied to the recording system signal processing unit 10, where various signal processing required for recording is performed. The processed video signal is supplied to the recording amplifier 14 after being FM-modulated by the FM modulator 12, where it is amplified and recorded on the tape 16 by a recording head (not shown).

Next, the reproducing system will be described with reference to FIG. 1B. The video signal reproduced from the tape 16 by the reproducing head (not shown) is supplied to the FM demodulator 20 after being amplified by the preamplifier 18. It The demodulated video signal is then subjected to dropout compensation by the dropout compensator 22 and noise removal by the temporal de-emphasis device 24. After that, the video signal is supplied to the reproduction system signal processing unit 26 for reproduction processing, and the final video signal is output from the VTR. In addition,
The temporal de-emphasis device 24 may not be provided.

Here, the dropout compensator 22 is set to 1
The video signal before the frame is held, and when dropout occurs during VTR playback and the video signal is missing,
The held signal is embedded in the missing signal. As a result, it is possible to reduce image distortion due to dropout.

The dropout compensator 22 has a structure as shown in FIG. 8, for example, and the input side of the FM demodulator 20 is connected to a dropout detection circuit 22A. The output side of the FM demodulator 20 is connected to one switching input side of the switching circuit 22B, and the frame memory 22C is connected to its input / output side.

The operation of the dropout compensator 22 will be described. The frame memory 22C holds the output of the switching circuit 22B, that is, the dropout compensator 22, for one frame period. The dropout detection circuit 22A checks whether or not a dropout has occurred by checking the amplitude level of the reproduction signal input from the tape side. The switching circuit 22B normally selects an input signal and outputs it as it is.

However, when a dropout is detected by the dropout detection circuit 22A, the signal one frame before stored in the frame memory 22C is selected and output instead of the output of the FM demodulator 20. in this way,
The method of compensating dropout by interpolating with the data of one frame period before is used when the dropout is continuously generated for several to several tens of times the horizontal scanning period of the video signal. It has the feature that it can effectively reduce turbulence.

A dropout compensator using a frame memory is disclosed in Japanese Patent Laid-Open No. 60-245382. In addition, JP-A-63-155
Japanese Patent No. 81 discloses a dropout compensating circuit for compensating according to the degree of correlation of an image between fields, frames and adjacent scanning lines.

Next, the temporal de-emphasis device 2
Reference numeral 4 is for holding a video signal for one frame and extracting a noise component by utilizing frame correlation of an image to reduce noise.

The temporal emphasis device 24 is
For example, the configuration is as shown in FIG. 9, and the first subtractor 24A is provided on the input side. This subtractor 24
The output side of A is connected to the minus (subtraction) input side of the second subtractor 24C via the frame memory 24B,
The output side is connected to the negative input side of the third subtractor 24F and the input side of the second coefficient unit 24G via the first coefficient unit 24D and the limiter 24E, respectively.
The output side of the coefficient unit 24G is connected to the minus side of the subtractor 24A. The output side of the dropout compensator 22 is connected to the plus input sides of the subtractors 24A, 24C and 24F, respectively.

The operation of this apparatus will be described. For example, it is assumed that one frame of image signal is stored in the frame memory 24B. The subtracter 24C subtracts the image signal stored in the frame memory 24B from the image signal of the next frame supplied from the dropout compensation device 22. Since the image signal has frame correlation, the difference obtained by this subtraction is extracted as a noise component. The noise component is supplied to the subtractor 24F after signal processing by the coefficient unit 24D and the limiter 24E. Subtractor 2
At 4F, this noise component is subtracted from the input image signal to remove noise.

On the other hand, the noise component is supplied to the subtractor 24A after being processed by the coefficient unit 24G, where it is subtracted from the input image signal. Then, the image signal from which the noise after the subtraction is removed is stored in the frame memory 24B. After that, the above operation is repeated. When the gain of the coefficient unit 24G is not 1, the image signal stored in the frame memory 24B does not match the output signal, but the difference obtained by subtracting the output of the frame memory 24B from the input image signal is regarded as noise. The image signal of the frame memory 24B is a signal having a high correlation with the current image signal.

[0013]

However, the above conventional techniques have the following disadvantages. (1) A frame memory is required for each of the dropout compensation device 22 and the temporal de-emphasis device,
The circuit scale becomes large. (2) When playing the unrecorded part of the video tape,
When the dropout occurs continuously for one frame period or more, the contents of the frame memory are not updated, and the image stored in the frame memory lastly continues to be output.

(3) When dropouts occur continuously at a specific position on the screen due to a scratch on the video tape, the contents of the frame memory are not updated for that part. However, other parts will be updated with new images. For this reason, the image of the old time is output for the portion corresponding to the dropout, and the reproduced images include the images of different times, which gives an unnatural impression.

The present invention focuses on these points,
A first object is to provide a dropout compensator capable of simplifying the circuit scale. A second object is to provide a dropout compensating device capable of performing good compensation without continuously reproducing the same image or reproducing an unnatural image with a time lag. .

[0016]

To achieve the above object, a first invention is a first memory means for storing a signal of a previous screen, a dropout detecting means for detecting a dropout in a current screen, Thus, when the dropout is detected, the dropout compensating device having the switching means for outputting the stored signal of the first memory means in place of the signal of the current screen stores the dropout information in the previous screen. It is determined that the dropout continuously occurs at a specific position on the screen by referring to the second memory means for performing the dropout detection, the detection result by the dropout detection means, and the dropout information of the second memory means. Sometimes, output limiting means for limiting the signal output of the first memory means is provided.

According to a second aspect of the present invention, the noise reduction process based on the signal correlation is performed by using the second memory means for the signal which has been subjected to the signal complement when the dropout occurs by using the first memory means. In the dropout compensating device connected to the subsequent stage, the noise reducing means performs both the first memory means and the second memory means and uses the output of the second memory means to generate the dropout. It is characterized by performing time signal complementation.

A third aspect of the invention is a noise reducing means for performing noise reduction processing based on signal correlation using the second memory means for the output signal of the dropout compensating apparatus of the first aspect. In a dropout compensator connected in stages, the first memory means and the second memory means are used in common, and the output of the second memory means is used to perform signal complement when a dropout occurs. Is characterized by.

[0019]

According to the present invention, the complement of the signal is limited when the dropouts occur continuously at a specific position in the frame or field. This prevents the reproduction of continuous images and the reproduction of unnatural images with a time lag. Further, according to the present invention, the memory means for storing the signal of the front screen in the dropout compensating device and the memory means for storing the signal in the noise reducing means in the latter stage are combined, and the circuit scale is reduced.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the dropout compensating device according to the present invention will be described in detail below with reference to the accompanying drawings. The same reference numerals are used for the same components as those of the above-described conventional technique or components corresponding to the conventional technique. <First Embodiment> First, a first embodiment will be described with reference to FIG. In addition, in FIG.
(Corresponding to the FM demodulator to the temporal de-emphasis device in (B)) is shown.

As shown in the figure, one input side of the switching circuit 22B of the dropout compensation device 30 is connected to the output side of the FM demodulator 20 as in the conventional example, but the other input side is connected. Is temporal de-emphasis device 2
The output side of the fourth frame memory 24B is connected.
The other components are the same as in the conventional example.

Next, the operation of the first embodiment will be described. First, when the dropout does not occur, the switching circuit 22B is switched to the FM demodulator 20.
Therefore, the output of the FM demodulator 20 is directly supplied to the temporal de-emphasis device 24, and the temporal de-emphasis device 24 operates normally as in the conventional example.

Next, when a dropout occurs,
The output of the frame memory 24B is selected in the switching circuit 22B, and this is the temporal de-emphasis device 24.
Will be supplied to. Therefore, the central subtractor 24
In C, both positive and negative inputs have the same value,
As a result, the difference output becomes "0". Therefore, the coefficient unit 24
The signal fed back to the input side through D, the limiter 24E and the coefficient unit 24G is also "0", and the content of the frame memory 24B is directly output from the subtractor 24A. Therefore, side effects such as oscillation in a loop including the frame memory 24B do not occur. The output of the subtractor 24F on the output side is also the frame memory 24.
It becomes the same data as the contents of B.

The content stored in the frame memory 24B is signal data that serves as a reference for extracting a noise component in the temporal de-emphasis device 24, and is a signal that is highly correlated with and similar to the current signal. Therefore, it is a preferable signal as a signal used for complementing dropout compensation.

As described above, according to the first embodiment, the frame memory of the temporal de-emphasis device is used instead of the frame memory used to store the complementary data in the dropout compensation. Therefore, the frame memory on the side of the dropout compensator becomes unnecessary, and the circuit configuration can be simplified. Further, the control means for driving the frame memory can be reduced.

<Second Embodiment> Next, a second embodiment will be described with reference to FIG. This embodiment is an embodiment in which a vertical de-emphasis device 42 is provided between the dropout compensation device 40 and the temporal de-emphasis device 24, as shown in FIG. The broken line portion of A) is shown in FIG. The vertical de-emphasis device 42 is for reducing noise based on the vertical correlation of signals.

In these figures, the output side of the switching circuit 22B of the dropout compensation device 40 is connected to the vertical de-emphasis device 42.
B, the output side of the vertical de-emphasis device 42 is connected to the input side of the other switching circuit 40A. Also,
The detection output side of the dropout detection circuit 22A is connected to the switching circuit 40A. And this switching circuit 4
The output side of 0A is connected to the subtractor 24A of the temporal de-emphasis device 24. Other configurations are similar to those of the first embodiment.

Next, the operation of the second embodiment as described above will be described. First, if dropout is not detected,
The switching circuit 22B is switched to the FM demodulator 20 side, and the switching circuit 40A is switched to the vertical de-emphasis device 4.
It is switched to the 2 side. Therefore, the output of the FM demodulator 20 is supplied to the vertical de-emphasis device 42 for vertical de-emphasis processing, and the processed signal is supplied to the temporal de-emphasis device 24.

Next, when the dropout is detected, the switching circuit 22B is switched to the frame memory 24B side and the switching circuit 40A is switched to the output side of the switching circuit 22B. That is, although the dropout compensation is performed, the vertical de-emphasis device 42 is bypassed and the process is not performed.

When a dropout occurs, the output data of the frame memory 24B is used by the vertical de-emphasis device 42, but the data of this frame memory 24B is the data already subjected to the vertical de-emphasis process. Therefore, if bypass processing is not performed, vertical de-emphasis processing will be duplicated. In order to avoid such overlapping vertical de-emphasis processing, bypass processing of the vertical de-emphasis device 42 by the switching circuit 40A is performed.

The processing of dropout compensation and temporal de-emphasis is the same as in the first embodiment. As described above, the present embodiment is applicable when there is another processing device between the dropout compensation device and the temporal de-emphasis device and it is necessary to prevent the processing from being duplicated. It is suitable. If the processing may be repeated, it is not necessary to provide the switching circuit 40A in FIG.

<Third Embodiment> Next, a third embodiment will be described with reference to FIGS. 3 and 4. This example
When dropouts continue for two or more frame periods at the same position on the screen, the frame complement dropout compensation is stopped from the second frame.

In FIG. 3, the dropout compensation device 5
In addition to the FM demodulator 20, the mute circuit 50B and the frame memory 22C are connected to the input side of the 0 switching circuit 50A. Further, the output side of the dropout detection circuit 22A has the dropout memory 5A in addition to the switching circuit 50A.
This dropout memory 5 is also connected to 0C.
The output side of 0C is connected to the switching circuit 50A. As in the above-described embodiment, the frame memory 24B of the temporal de-emphasis device 24 may be connected to the switching circuit 50A instead of the frame memory 22C (see the broken line in the figure).

Of the above parts, the dropout memory 50C is a 1-bit width memory having the same delay time as that of the frame memory 22C (or 24B), and the position on the screen where the dropout occurred is 1 It has a function of holding for a frame period. That is, the output of the dropout memory 50C is 1 at the corresponding position on the screen.
Indicates whether there was a dropout before the frame period.

The switching circuit 50A refers to the dropout information in the current frame supplied from the dropout detection circuit 22A and the dropout information of one frame before supplied from the dropout memory 50C, and is referred to in FIG. It has a function of switching and outputting any one of a, b, and c. Further, the mute circuit 50B has a function of outputting a constant value that is visually inconspicuous on the screen, for example, a signal that becomes a black level for a luminance signal and becomes colorless for a color signal.

Next, the operation of the third embodiment will be described. When it is determined from the output of the dropout detection circuit 22A that there is no dropout in the current frame: In this case, the switching circuit 50A switches to the FM demodulator 20, and the output a of the FM demodulator 20 remains as is for the temporal de-emphasis device. 24. In this case, the operation is performed regardless of the output of the dropout memory 50C.

When it is judged from the output of the dropout detection circuit 22A that there is a dropout in the current frame, and from the output of the dropout memory 50C that there is no dropout in the previous frame: In this case, the same as in the previous embodiment. The output c of the frame memory 22C (or the frame memory 24B) is the temporal de-emphasis device 2
4 is supplied. That is, it operates as a normal frame complement dropout compensation device.

When it is judged from the outputs of the dropout detection circuit 22A and the dropout memory 50C that there is a dropout in both the current frame and the previous frame: In this case, the output b of the mute circuit 50B by the switching circuit 50A. Are supplied to the temporal de-emphasis device 24. Table 1 below summarizes such output selection operations.

[0039]

[Table 1]

Next, the operation of the above embodiment will be described with reference to FIG. For example, it is assumed that the signal of the (n-1) th frame has no dropout as shown in FIG. Then, it is assumed that the dropout DO exists at the same position in the nth frame and the (n + 1) th frame, as shown in FIGS. Nth in FIG.
If the second frame is the current frame, there is no dropout in the previous frame, so the above condition is satisfied. Therefore, with respect to the dropout DO portion, the signal of the (n-1) th frame which is the previous frame is complemented, and the output image becomes as shown in FIG.

Next, assuming that the (n + 1) th frame in FIG. 11C is the current frame, the nth frame which is the previous frame.
The dropout DO will also be present in the second frame. In this case, if supplementation is performed as in the prior art,
Since the signal of FIG. 6D is stored in the frame memory 22C (or the frame memory 24B), the signal of the (n-1) th frame in the (n + 1) th frame as shown in FIG. Will be included. That is, the image becomes unnatural with time lag.

However, in this embodiment, the above condition is satisfied in such a case, and the dropout DO
The output of the mute circuit 50B is selected for the portion of. Therefore, the output image becomes as shown in FIG. As described above, according to this embodiment, when the dropout occurs continuously for two frames or more at a specific position on the screen, the output of the mute circuit is selected instead of the output of the frame memory. Therefore, the data of two frames or more before is not used for complementation, and it is possible to perform favorable dropout compensation while preventing reproduction of an unnatural image with a time lag.

<Fourth Embodiment> Next, a fourth embodiment will be described with reference to FIG. In the fourth embodiment, if dropouts occur continuously for two frames or more,
Instead of the mute signal output of the third embodiment, the data of the previous line (horizontal scanning line) is complemented.

In FIG. 5, the dropout compensation device 6
0 is the line complement compensator 62 and the frame complement compensator 6
Includes 4 and. The line complement compensator 62 includes a switching circuit 62A and a line memory 62B, and the frame complement compensator 64 includes a switching circuit 64A, a dropout memory 50C, and a frame memory 22C (or a frame memory 24B). Dropout detection circuit 22A
The output side of is connected to the switching circuits 62A and 64A and the dropout memory 50C, respectively.

Of these, the line memory 62B of the line complement compensator 62 is for storing the output of the switching circuit 62A for one line and outputting it with a delay of one line period. That is, when dropout occurs in the next line, the switching circuit 62A outputs the data of the previous line from the line memory 62B to perform dropout compensation for line complement. Next, the frame complement compensator 64 has a configuration in which the mute circuit is removed from the third embodiment, and the switching operation of the switching circuit 64A is performed as shown in Table 2 below.

[0046]

[Table 2]

That is, when the dropouts occur continuously over two frames, the line complement compensator 62.
The output is selected and output. Next, the operation of the fourth embodiment as described above will be described. First, in the switching circuit 62A of the line compensation compensator 62,
When there is no dropout, the output A of the FM demodulator 20 is selected, and when dropout occurs, the output B of the line memory 62B is selected. Line memory 62B
Stores this switching output for one line period and prepares for dropout of the next line. In this way, line complement dropout compensation is performed.

Next, in the frame complement compensator 64, the switching circuit 64A is switched as shown in Table 2 above. When it is determined from the output of the dropout detection circuit 22A that there is no dropout: In this case, the switching circuit 6
It is switched to the line compensation compensator 62 by 2A, and the output a of the line compensation compensator 62 is directly supplied to the temporal de-emphasis device 24. Since the dropout detection circuit 22A determines that there is no dropout, line complement in the line complement compensator 62 is also not performed. Therefore, in this case, the output A of the FM demodulator 20 is directly applied to the temporal de-emphasis device 24.
Will be supplied to. Further, this operation is performed regardless of the output of the dropout memory 50C.

When it is determined from the output of the dropout detection circuit 22A that there is a dropout in the current frame, and from the output of the dropout memory 50C that there is no dropout in the previous frame: In this case, the same as in the previous embodiment. The output c of the frame memory 22C (or the frame memory 24B) is the temporal de-emphasis device 2
4 is supplied. More specifically, regarding the dropout portion, first, B is selected by the line complement compensator 62 to perform line complement, and the frame complement compensator 6 is further added.
In step 4, c is selected and frame complement is performed. Therefore, as a result, c is selected instead of A and frame complement is performed. That is, in this case, the device operates as a normal frame complement dropout compensation device.

When it is judged from the outputs of the dropout detection circuit 22A and the dropout memory 50C that there is a dropout in both the current frame and the previous frame: In this case, the switching circuit 64A causes the line complement compensator 62 to detect the dropout. The output a is supplied to the temporal de-emphasis device 24. In the line interpolation compensator 62, line complement is performed, and consequently B is supplied to the temporal de-emphasis device 24.

That is, similarly to the third embodiment, when the dropout occurs continuously at two or more frames at a specific position on the screen, the output of the frame memory 22C is not selected. Therefore, the data of two or more frames before is not used for complementation, and the reproduction of an unnatural image with a time lag is prevented. Further, at this time, since the image data of one line before is complemented, more natural complementation is possible for the dropout of an image having a small number of lines.

<Fifth Embodiment> Next, a fifth embodiment will be described with reference to FIG. This embodiment is basically the same as the fourth embodiment, but the same effect can be obtained without using the dropout memory 50C. As described above, the dropout memory 50C is a memory that stores 1-bit width data indicating that there is a dropout. If there is a dropout, the contents of the frame memory 22C are not used. The present embodiment focuses on such a point, and is used as a dropout memory without increasing the bit width of the frame memory 22C.

In the figure, the clear circuit 72A is connected to the input side of the frame memory 22C of the frame complement compensator 72 of the drop compensator 70, and the clear detection circuit 72B is connected to the output side of the frame memory 22C. Has been done. The output side of the clear detection circuit 72B is connected to the switching circuit 64A instead of the dropout memory 50C. The output side of the dropout detection circuit 22A is also connected to the clear circuit 72A. The other structure is the same as that of the fourth embodiment.

Of these, the clear circuit 72A is provided for the frame memory 22C when the dropout is detected.
It is for clearing the data just before the input of.
This data is cleared by setting the data in the dropout portion to data that is not normally used as image data, eg, "0". The clear detection circuit 72B is for detecting whether or not the output of the frame memory 22C includes clear data.

Next, the operation of this embodiment will be described. When dropout is detected, the clear circuit 72A clears the data in that portion. As a result, the frame memory 22C stores the data of one frame before the dropout portion is cleared.
Then, in the clear detection circuit 72B, the frame memory 2
Clear detection of the 2C output is performed. Since the data is cleared when there is a dropout, this clear detection makes it possible to determine whether or not there was a dropout one frame before.

The result of this clear detection is the switching circuit 64A.
Is supplied to. Therefore, the input of the switching circuit 64A is the same as in the fourth embodiment, and the switching selection is the same as in Table 2 above. On the other hand, since the line compensation compensator 62 is the same as that of the above-mentioned embodiment, the compensation operation and output selection are the same as those of the fourth embodiment in this embodiment. That is, according to the present embodiment, the same effect as that of the above embodiment can be obtained without using a large-scale dropout memory.

In this embodiment, the frame memory 22
The dropout part of C is cleared. However, as shown in Table 2, the data stored in the frame memory 22C is used only when there is no dropout one frame before, so the data of the cleared portion is not used. Therefore, there is no particular impact due to data clear.

The present invention is not limited to the above embodiment, and includes, for example, the following. (1) The coefficient value setting of the coefficient unit of the temporal de-emphasis device may be appropriately performed as necessary. (2) In the above-described embodiment, the dropout compensation is performed by the frame complement, but the field may be used as a unit.
The same applies to the temporal de-emphasis device, and field correlation may be used instead of frame correlation.

[0059]

As described above, the dropout compensator according to the present invention has the following effects. (1) When the dropouts occur continuously at a specific place, the signal complement is limited, so that the same image is continuously reproduced, or an unnatural image with a time lag is reproduced. Good dropout compensation can be done. (2) Since the memory means is used both as the dropout compensation device and the noise reduction means, the circuit scale can be simplified.

(3) The circuit scale is simplified because the signal complement is limited when the dropouts continuously occur at a specific location, and the memory means is used both as the dropout compensation device and the noise reduction means. Along with
It is possible to perform good dropout compensation without continuously reproducing the same image or reproducing an unnatural image with a time lag.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a first embodiment of a dropout compensation device according to the present invention.

FIG. 2 is a configuration diagram showing a second embodiment of the present invention.

FIG. 3 is a configuration diagram showing a third embodiment of the present invention.

FIG. 4 is an explanatory diagram showing an operation of the third embodiment.

FIG. 5 is a configuration diagram showing a fourth embodiment of the present invention.

FIG. 6 is a configuration diagram showing a fifth embodiment of the present invention.

FIG. 7 is a block diagram showing a basic configuration of a VTR.

FIG. 8 is a configuration diagram showing an example of a conventional dropout compensation device.

FIG. 9 is a configuration diagram showing an example of a conventional temporal de-emphasis device.

[Explanation of symbols]

22, 30, 40, 50, 60, 70 ... Dropout compensation device, 22A ... Dropout detection circuit (dropout detection means), 22B, 40A, 50A, 62A,
64A ... Switching circuit (switching means, output limiting means), 22
C, 24B ... Frame memory (first and second memory means), 24 ... Temporal de-emphasis device (noise reduction means), 24A, 24C, 24F ... Subtractor, 24
D, 24G ... Coefficient device, 24E ... Limiter, 42 ... Vertical de-emphasis device, 50B ... Mute circuit (output limiting means), 50C ... Dropout memory (second memory means), 62 ... Line complement compensator, 62B ... Line memory, 64, 72 ... Frame complement compensator, 72A ... Clear circuit, 72B ... Clear detection circuit (output limiting means).

Claims (3)

[Claims] 1. A first memory means for storing a signal of a previous screen, a dropout detection means for detecting a dropout in a current screen, and a dropout detection means for replacing the signal of the current screen. A dropout compensating device including a switching means for outputting a storage signal of the first memory means, a second memory means for storing dropout information on a previous screen, and a detection result by the dropout detecting means. An output limit that limits the signal output of the first memory unit when it is determined that the dropouts occur continuously at a specific position on the screen with reference to the dropout information of the second memory unit. And a dropout compensating device. 2. A noise reducing means for performing noise reduction processing based on signal correlation by using the second memory means for a signal which has been subjected to signal complementation when a dropout occurs by using the first memory means. However, in the dropout compensation device connected to the subsequent stage, the first memory means and the second memory means are used in common and the output of the second memory means is used to complement the signal at the time of dropout occurrence. A dropout compensation device characterized by performing. 3. Noise reduction means for performing noise reduction processing on the output signal of the dropout compensation device according to claim 1 based on signal correlation using the second memory means,
In the dropout compensation device connected to the subsequent stage, the first memory means and the second memory means are used in common, and the output of the second memory means is used to perform signal complementation when a dropout occurs. A dropout compensation device characterized by the above.