JPH07312740A - Video signal recording and reproducing device - Google Patents

Abstract

PURPOSE:To allow the device to cope with both High Vision and ATV system video signals A, B by converting the number of effective scanning lines ESb of the ATV system video signal into the number of effective scanning lines ESa of the High Vision system and converting the ESa of a reproduced signal into the ESb. CONSTITUTION:An input video signal aa of the High Vision system is given to one input terminal of selection means 2, 5 and an input video signal bb of the ATV system is given to a scanning line conversion means 1. The means 1 converts the signal bb into a conversion video signal 1a having the number of effective scanning lines (ES) being 1035 lines of the signal aa and the converted signal is given to the other input terminal of the means 2, from which the signal aa or 1a is selectively outputted. A recording processing means 3 records the selected signal 2a onto a recording medium TT, the signal is reproduced by a reproduction processing means 4, from which the signal 4a having ES of 1035 lines is outputted. The signal 4a is converted into a signal 6a whose scanning line is ES of 1080 lines by a scanning line conversion means 6 via a selection means 5. Thus, the device copes with both the signals aa, bb and the signals are displayed on HDTV, ATV monitors 9, 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal recording / reproducing apparatus.

[0002]

2. Description of the Related Art In Japan, so-called high-definition broadcasting has been put into practical use as a high-definition TV system. According to this, the number of effective scanning lines is 1035 (10 in the MUSE method).
(32 lines), the horizontal effective scanning time is 25.9 μ, and thus an image having an aspect ratio of horizontal: vertical = 16: 9 can be obtained.

On the other hand, as a standard for high image quality, A
There is a TV, and its 30 Hz, 2: 1 mode has almost all parameters related to the TV system, such as the total number of scanning lines, vertical synchronizing frequency, horizontal synchronizing frequency, and horizontal effective period, which are equal to those of high definition. However, the number of effective scanning lines is different between the two standards. That is, the number of effective scanning lines in HDTV is 103
The number of effective scanning lines of ATV is 1 while it is 5
The number is 080. On the other hand, as an apparatus capable of recording a high-definition image signal, for example, "UNIHI" which is a standard for business use, and "W-VH" which is a standard for home use.
S "is known. Since the W-VHS standard allows recording in the NTSC system as well, the number of scan lines that can be recorded is MU.
There are 1032 effective scanning lines of the SE method.

[0004]

However, both standards have 10
Since 80 scanning lines cannot be recorded, there is a drawback that recording cannot be performed when an ATV image signal is input.

Although the monitor has a few percent overscan, when the recording medium on which 1035 or 1032 effective scanning lines are recorded is displayed on the ATV monitor, 45 or 48 effective scanning lines are displayed. Is not displayed,
There was a risk that the image quality would deteriorate.

Furthermore, when a recording medium on which 1035 or 1032 effective scanning lines are recorded is displayed on an ATV monitor, since the effective scanning lines are different, a vertically long screen is formed by about 4% and the image is distorted. There was a drawback.

[0007] Therefore, the object of the present invention is to solve the above drawbacks.

[0008]

The present invention provides the following configurations in order to solve the above problems.

The first invention is a first input video signal according to the first TV system having a relatively small number of effective scanning lines and a second input according to a second TV system having a relatively large number of effective scanning lines. A video signal recording / reproducing device for selectively recording / reproducing a video signal, wherein the number of effective scanning lines of the second input video signal is the first scanning line.
Scanning line conversion means for converting the number of effective scanning lines of the input video signal into a first converted video signal and outputting the first converted video signal, the first converted video signal and the first input video signal. Selection means for outputting a selection signal obtained by selection, recording processing means for performing recording processing on the selection signal and recording it on a recording medium, and reproduction processing for performing reproduction processing on a signal reproduced from the recording medium. A reproduction processing means for outputting a signal, and a second scanning line for converting the number of effective scanning lines of the reproduced signal into the number of effective scanning lines of the second input video signal to output a second converted video signal. Converting means and means for supplying the reproduction signal to the first output terminal for the first TV system and supplying the second converted video signal to the second output terminal for the second TV system. The present invention provides a video signal recording / reproducing device characterized by having.

A second invention is a first input video signal according to the first TV system having a relatively small number of effective scanning lines and a second input according to a second TV system having a relatively large number of effective scanning lines. A video signal recording / reproducing device for selectively recording / reproducing a video signal, wherein the number of effective scanning lines of the second input video signal is the first scanning line.
Scanning line conversion means for converting the number of effective scanning lines of the input video signal into a first converted video signal and outputting the first converted video signal, the first converted video signal and the first input video signal. A first selection unit that outputs a first selection signal obtained by selection, a recording processing unit that performs a recording process on the first selection signal and records the recording medium on a recording medium, and the first recording unit outputs the first selection signal from the recording medium. Reproduction processing means for performing reproduction processing on the signal obtained by reproducing the selection signal and outputting the reproduction signal, and second selection means for selecting the first input video signal and the reproduction signal and outputting the second selection signal. And the second
Scanning line conversion means for converting the number of effective scanning lines of the selection signal into the number of effective scanning lines of the second input video signal and outputting a second converted video signal, the reproduction signal and the reproduction signal. The first output video signal obtained by selecting the first selection signal and the first T
The second output video signal obtained by selecting the second conversion video signal and the second input video signal is supplied to the third selection means for supplying the first output terminal for the V system to the second output video signal. And a fourth selecting means for supplying the second output terminal for the TV system to the video signal recording / reproducing apparatus.

A third invention is a video signal recording / reproducing apparatus according to the first and second inventions, wherein the first scanning line converting means is constituted by thinning means for thinning out effective scanning lines. The present invention provides a video signal recording / reproducing device that does.

A fourth invention is a video signal recording / reproducing apparatus according to the first and second inventions, wherein the first scanning line converting means is constituted by thinning means for thinning out effective scanning lines, and The second scanning line converting means is composed of an interpolating means for interpolating the average value of the scanning line immediately before and the scanning line immediately after the scanning line thinned out by the first scanning line converting means. A playback device is provided.

A fifth invention is the video signal recording / reproducing apparatus according to the first and second inventions, wherein the first scanning line converting means is a vertical low-pass filter for attenuating a high frequency component in the vertical direction. The present invention provides a video signal recording / reproducing device, characterized in that the video signal recording / reproducing device has a memory means for absorbing a time lag due to a decrease in the number of scanning lines.

A sixth invention is a video signal recording / reproducing apparatus according to the first and second inventions, wherein the first scanning line converting means is a motion detecting means for detecting a motion amount, and the motion detecting means. Provided is a video signal recording / reproducing apparatus having a vertical low-pass filter for attenuating a high-frequency component in the vertical direction based on the detection result of the means, and a memory means for absorbing a time shift due to a decrease in the number of scanning lines. To do.

[0015]

1 is a block diagram for explaining an embodiment of a video signal recording / reproducing apparatus according to the present invention, FIG. 2 is a conceptual diagram for explaining a scanning line, and FIG. 3 is a view for explaining the first embodiment. Two
4 is a block diagram for explaining the scanning line converting means of FIG. 4, FIG. 4 is a block diagram for explaining the second scanning line converting means in the second embodiment, and FIG. 5 is a timing chart for explaining FIG. 6 is a block diagram for explaining the first scanning line converting means in the third embodiment, FIG. 7 is a timing chart for explaining FIG. 6, and FIG. 8 is a scanning line number at the time of recording in the third embodiment. 9 is a conceptual diagram for explaining the conversion operation, FIG. 9 is a block diagram for explaining the second scanning line conversion means in the third embodiment, FIG. 10 is a timing chart for explaining FIG. 9, and FIG. 3 is a conceptual diagram for explaining the conversion operation of the number of scanning lines at the time of reproduction in the third embodiment
FIG. 12 is a conceptual diagram for explaining scanning line conversion of the third embodiment by integrating recording and reproduction, FIG. 13 is a conceptual diagram for explaining line numbers, and FIG. 14 is a first diagram of the fourth embodiment. 15 is a block diagram for explaining the scanning line converting means of FIG. 15, and FIG. 15 is a block diagram for explaining the second scanning line converting means of the fourth embodiment. Hereinafter, embodiments will be described with reference to the drawings.

In the first and second embodiments, the first input video signal according to the high-definition system having a relatively small number of effective scanning lines and the second input video signal according to the ATV system having a relatively large number of effective scanning lines are provided. For recording and reproducing the second video signal, the effective scanning lines are simply thinned out when the second video signal is recorded, converted into the same number of effective scanning lines as the first input video signal, and recorded. The thinned effective scanning lines are interpolated.

On the other hand, in the third and fourth embodiments, when the second input video signal is recorded, a vertical LPF is applied to convert the effective scanning line into the same number of effective scanning lines as the first input video signal. Is recorded, and a vertical HPF having a complementary relationship with the vertical LPF is applied at the time of reproduction to interpolate an effective scanning line.

(Premise of Embodiment) First to fourth with reference to FIG.
A video signal recording / reproducing apparatus which is a premise of the embodiment will be described.
Incidentally, the present apparatus, a recording mode for recording the video signal in the recording medium, a reproduction mode for reproducing the video signal from the recording medium,
There is an EE mode in which the video signal is not recorded and reproduced but the video signal is supplied to the monitor.

The first input video signal aa according to the high-definition system is supplied to one input of the first selecting means 2, while the second input video signal bb according to the ATV system is converted into the first scanning line number. After the effective scanning lines are converted by the means 1 and converted into the first converted video signal 1a having the number of effective scanning lines (1035) of the first input video signal aa, the first selection means 2 To the other input of.

Then, the first selecting means 2 selectively outputs the first input s video signal aa or the first converted video signal 1a according to the selection of the video signal to be recorded. Then, the selected first selection signal 2a is subjected to recording processing such as emphasis and FM modulation by the recording processing means 3, and then recorded on the recording medium TT via the magnetic head H1. Incidentally, the recording medium may be any information recording medium such as a magnetic tape, a magnetic disk, an optical recording medium and the like.

The signal reproduced from the recording medium through the magnetic head H2 is subjected to reproduction processing such as FM demodulation and de-emphasis by the reproduction processing means 4 having a complementary relationship with the recording processing means 3 and reproduced. It is output as the signal 4a. The number of effective scanning lines of the reproduction signal 4a is 1035. Then, the reproduction signal 4a is supplied to one input of the third selecting means 7, is selected as the first selection signal 2a supplied to the other input, and the selected first output video signal cc is the first. It is supplied to the high-definition monitor 9 through the output terminal c of. The third selecting means 7 reproduces the reproduction signal 4 in the reproduction mode.
a is selected, and the first selection signal 2a is selected in other recording modes and EE modes. This allows
Even if the input video signal or the reproduced video signal is the second input video signal bb related to ATV, since the effective scanning line number is converted by the first scanning line converting means 1, the high-definition monitor 9 Can be displayed.

The reproduction signal 4a is supplied to one input of the second selecting means 5 and is selected as the first input video signal aa supplied to the other input, and the selected second selection signal 5a is selected. Is supplied to the second scanning line number conversion means 6. The second selection means 5 selects the reproduction signal 4a in the reproduction mode, and the first selection means in the other recording modes and the EE mode.
Input signal aa is selected.

The second scanning line number converting means 6 is 10
The 35 effective scanning lines are converted into 1080 lines to generate the second converted video signal 6a, which is specifically converted by interpolation or vertical HPF. The second converted video signal 6a is supplied to one input of the fourth selecting means 8 and is selected as the second input video signal bb supplied to the other input, and the selected second output video is selected. The signal dd is supplied to the ATV monitor 10 via the second output terminal d.

The fourth selecting means 8 selects the second converted video signal 6a in the reproducing mode, in the recording mode of the first input video signal aa, and in the EE mode, and the other second input video signal. In the bb recording mode and the EE mode, the second input video signal bb is selected. As a result, even if the input video signal or the reproduced video signal is the first input video signal relating to high-definition, the second scanning line conversion means 6 converts the number of effective scanning lines, and thus the ATV monitor. 9 can be displayed.

Summarizing these, the first and second output video signals cc and dd are based on the signals shown in Table 1.

[0026]

[Table 1] (First Embodiment) In the first embodiment, in order to realize the first scanning line converting means 1 of the video signal recording / reproducing apparatus shown in FIG. 1 with a simple structure, thinning means for thinning out predetermined lines is used.
The second scanning line converting means 6 interpolates the lines thinned during reproduction at a gray level. Since the other configurations in FIG. 1 are the same, the description thereof will be omitted.

If the effective scanning lines at the beginning of each field among all the scanning lines of the second input video signal bb are 1,563 lines, the screen shown in FIG. 2 is obtained. The thinning-out means is 1 to 12 lines, 530 to 540 lines and 56 which are the upper and lower parts of the screen which are less likely to be displayed on the monitor.
The first converted video signal 1a obtained by thinning out 3 to 573 lines and 1092 to 1102 lines is generated. When the recording processing means 3 in the subsequent stage records 1032 effective scanning lines of the MUSE signal as in the W-VHS system, the thinning means 1 to 13 lines, 530 to 54
0 line, 563 to 574 line, 1091 to 1102
The lines may be thinned out and the structure of the thinning-out means in the recording processing means 3 may be omitted.

The second scanning line converting means 6 is composed of a switch circuit as shown in FIG. 3, and has 1 to 12 lines, 530 to 540 lines and 56 thinned by the thinning means.
The gray level signal g supplied to the terminal b is selected at the timing of the lines 3 to 573 and 1092 to 1102, while the second selection signal 5a supplied to the terminal a is selected in the other period, and Two scanning line conversion signals 6a are selectively output.

In this way, the signal interpolated with the gray level signal g is output as the second output video signal dd, so that conspicuous deterioration in image quality can be reduced even if the lines thinned during recording are displayed on the ATV monitor. .

(Second Embodiment) The second embodiment is shown in FIG.
This is the same as the first embodiment in that the first scanning line converting means 1 of the video signal recording / reproducing apparatus is constituted by thinning means for thinning out predetermined lines in order to realize the simple structure, but the second scanning is performed. This is different from the first embodiment in that lines thinned out by the line conversion means 6 at the time of reproduction are interpolated by the average value of the lines before and after the line. The differences will be described below with reference to FIGS. 4 and 5. Since the other configurations in FIG. 1 are the same, the description thereof will be omitted.

In FIG. 4, the second selection signal 5a is 13
13H memory 600 and 1 with memory capacity for lines
1H memories 601 to 60 having memory capacity for lines
4 and 4 respectively. And 13H memory 600
Write the second selection signal 5a during the period when the write enable signal shown in FIGS.
After a delay of 3H, the read enable signal shown in (C) and (I) of FIG.
Read out. On the other hand, the 1H memories 601 to 604 respectively write the second selection signal 5a during the high level period of the write enable signal shown in FIGS.
Specifically, the period of ~ corresponds to the writing period of the 1H memories 601 to 604, respectively, and after a predetermined time delay,
The second select signal 5a is read out during the high level period of the read enable signal shown in FIGS. still,
The 1H memories 601 to 604 are reset by the reset pulse shown in FIGS. Further, (A) and (G) in the figure show the line numbers of the second selection signal 5a, and (C), (E), and
It corresponds to the numbers shown in (I) and (K).

Then, the output signals of the 1H memories 601 and 602 are added by the adding means 605 and are halved by the coefficient means 607 to become an average value of 13 lines and 574 lines, and this signal is the terminal e of the switch circuit 609. Is supplied to. On the other hand, the output signals of the 1H memories 603 and 604 are added by the addition means 606 and are halved by the coefficient means 608 to become an average value of 529 lines and 1091 lines, and this signal is supplied to the terminal f of the switch circuit 609. It

Further, the switch circuit 609 has 1 to
When outputting 12,563 to 573 lines, the output of the counting means 607 which is an average value of 13 lines and 574 lines is selected, and when outputting 530 to 540,1092 to 1102 lines, the average value of 529 lines and 1091 lines is selected. The output of a counting means 608 is selected.

Then, the output signal of the switch circuit 609 and the output signal of the 13H memory 600 for time adjustment are selected by the switch circuit 610 and the lines thinned during recording are interpolated to obtain the second converted video signal 6a. Is being output.

The 1H memories 602 and 603 and the adding means 607 and 608 are omitted, and the outputs of the 1H memories 601 and 604 are connected to the terminals e and f of the switch circuit 609, respectively, so that 1 to 12 lines and 563 to 573 lines can be obtained. When the output of 13
The output signal of the 1H memory 601 which is the line signal is selected, and when the lines 530 to 540 and 1092 to 1102 are output, the 1H memory 604 which is the signal of the 1091 line is selected.
Output signal may be selected.

In this way, since the signal interpolated by the average value is output as the second output video signal dd, even if A
Even if the thinned lines are displayed on the TV monitor at the time of recording, it can be made inconspicuous, and in particular, since the interpolation is performed using the average value, the boundary between the effective scanning line and the interpolation scanning line becomes natural.
Image quality deterioration can be further reduced as compared with the embodiment.

(Third Embodiment) In the first and second embodiments, since a simple thinning-out means is used as the first scanning line converting means 1, when it is displayed on the ATV monitor during reproduction, it is vertically long by about 4%. However, in the third and fourth embodiments, the predetermined line is deleted while applying the vertical LPF, and in particular, in the third embodiment, the processing is completed within the field. The third embodiment will be described below with reference to FIGS. 6 to 12. Since the configuration other than the first and second scanning line converting means 1 and 6 is the same as that of FIG. 1, the description thereof will be omitted.

First, the first scanning line converting means 1 will be described. Since the maximum common divisor of 1080 effective scanning lines of the second input video signal bb according to the ATV system and 1035 effective scanning lines of the first input video signal aa according to the high-definition system is 45, 1080 lines are 24 A book is divided into 45 blocks, and each block is converted from 24 to 23, thereby converting 1080 to 1035.

Here, the number of effective scanning lines of the first input video signal aa according to the high-definition system is 1035 lines / frame, but for simplicity of explanation, it is treated as a signal of 517 lines / field, and the second line. Of the input video signal bb is A (M), and the N-line signal of the first converted video signal obtained by converting this signal is B (M).
Assuming that (N), the conversion process of the first scanning line conversion means 1 is represented by the formula 1.

B (N) = K1 {(M + 12) mod24} × A (M) + K2 {(M + 12) mod24} × A (M−1) ... Equation 1 where K1 (X) and K2 (X) are coefficients And M is M = N + INT {(N + 11) ÷ 23} +1 (INT is an integer part) Further, K1 (X) is the case of X = 0. K1 (X) = 1 0 <X ≦ 22 Case 0 <K1 (X) <1 Furthermore, K2 (X) is K2 (X) = 1−K1 (X). Note that K1 (X) is, for example, K1 (0) = 1,
K1 (1) = 1/23, K1 (2) = 2/23, ... K1
(22) = 22/23 may be used.

Specifically, the first scanning line converting means 1 is configured by the block diagram shown in FIG. 6, and its timing chart is shown in FIG. In FIGS. 6 and 7, the second input video signal bb is
After outputting the line shown in FIG. 7B by delaying the time corresponding to the lines, K2 is multiplied by the coefficient means 101, and the result is supplied to one input of the adding means 103. The second input video signal bb is supplied to the other input of the adding means 103 after being multiplied by K2 in the coefficient means 102. Then, the signal obtained by adding both inputs by the adding means 103 is supplied to the 24H memory 104 for absorbing the time lag due to the decrease in the number of scanning lines, where 24 lines are converted into 23 lines. .

Further, the 24H memory 104 is shown in FIG.
The line shown in FIG. 3 is supplied, and the input signal is written during the period when the write enable signal shown in FIG. That is, 23 lines out of 24 lines are written, 13,
Lines 37, ... 24n + 13, ... 493,517 are not written (n is an integer from 0 to 21). Then, the signal is read out during the high level period of the read enable signal shown in FIG. 8E, and its line number is as shown in FIG. Incidentally, FIG. 9A shows the line number of the second input video signal bb.
The 24H memory 104 may be a FIFO memory having a capacity of 24 lines or more.

As described above, the vertical LPF is configured by the configurations 100 to 103, 24 lines are converted into 23 lines by the 24H memory 104, and the above-mentioned formula 1 is realized. As shown in FIG. The second input video signal bb is subjected to scanning line conversion processing to become the first converted video signal 1a.

Next, the principle of the second scanning line converting means 6 will be described. Second selection signal 5a which is an input signal
C (P) is the signal of the P line related to
If the signal of the Q line related to the converted video signal 6a of (2) is D (Q), the conversion process of the second scanning line conversion means 2 is given by the formula 2.

D (Q) = K3 {(Q-1) mod24} × C (P) + K4 {(Q-1) mod24} × C (P + 1) ... Equation 1 However, K3 (X), K4 (X) Is a coefficient, P is P = Q-INT {(Q-1) ÷ 24} +1 (INT is an integer part), and K3 (X) is X = 0, K3 (X) = 1 In the case of 0 <X ≦ 23 0 <K3 (X) <1 Further, K2 (X) is set to K2 (X) = 1−K1 (X). Note that K3 (X) is, for example, K3 (0) = 1,
K3 (1) = 23/24, K3 (2) = 22/24, ...
K3 (23) = 1/24 may be set.

This will be specifically described with reference to FIGS. 9 to 11.
In FIG. 9, the second selection signal 5a (FIG. 10 (A)) is supplied to the 24H memory 620, and the write enable signal shown in FIG. 10 (B) writes to the memory 620 during the high level period. The write reset is performed at the timing shown in FIG. And the same figure (D)
While the read enable signal shown in FIG. 6 is in the high level period, the memory 620 is read out, and the read reset is performed at the timing shown in FIG. In this way, the line shown in FIG. 7F is read from the 24H memory 620, and this signal is supplied to the 1H memory 621 and the coefficient means 622.

The 1H memory 621 delays the output signal of the 24H memory by one line and outputs the signal shown in FIG. Then, the coefficient means 622,
Reference numeral 623 supplies the signal obtained by the multiplication of the coefficients K3 and K4 to the adding means 624, where both inputs are added to add the signal to the adding means 624.
The second converted video signal 6a shown in FIG.

In this way, the read reset is continuously supplied to the 24H memory 620 for 2H as shown in FIG. 10E, and the next read reset is supplied after 23H. It can be performed in a 24H cycle. Then, the output signal of the 24H memory 620 is extended to 540 lines from 517 lines while applying the vertical LPF configured by the configurations 621 to 624.

Now, the operations of the first and second scanning line converting means 1 and 6 will be integrated and described with reference to FIG. In the figure, "input line number" is the line number of the input signal relating to the first scanning line converting means 1, and "recording line number" is the output signal relating to the first scanning line converting means 1 and the second scanning. It is a line number related to the input signal of the line conversion means 6, and "output line number" is a line number related to the output signal of the second scanning line conversion means 6. The connection between the "input line number" and the "recording line number" indicates that the output signal of the first scanning line conversion means 1 is generated based on the input signal of the connection destination. The connection between the "recording line number" and the "output line number" indicates that the output signal of the second scanning line converting means 6 is generated based on the input signal of the connection destination. Furthermore, the mathematical formulas shown on the right side show the relationship between the input signal of the first scanning line converting means 1 (I (X): X is the input line number) and the output signal of the second scanning line converting means 6. Is.

In the figure, the line corresponding to the input line number "12" is not processed by the first scanning line converting means 1 and is output as it is as the line corresponding to the recording line number "11". The line is generated from two lines. By converting the scanning lines in this manner, it is possible to easily perform the scanning line conversion while performing the vertical LPF. Further, the line corresponding to the recording line number “1,24” is not processed by the second scanning line conversion means 6 and is output as it is as the line corresponding to the output line number “1,25”, but the other line Is generated from two lines. By converting the scan lines in this way, the vertical LPF
The scanning line conversion can be easily performed while performing the above. Furthermore, since the lines directly output by the first and second scanning line converting means 1 and 6 are different, the output signal of the second scanning line converting means 6 which is the final output is at least the first scanning line converting means 1. Since it is generated based on at least two lines related to the input signal of, it is possible to obtain a natural image quality.

In this way, when the 1080 effective scanning lines are converted into 1035 lines, the conversion is performed while applying the LPF in the vertical direction instead of simply thinning out the scanning lines. Therefore, the first input video signal according to the ATV system is obtained. When aa is displayed on the high-definition monitor in EE mode and the first input video signal a
Even when the recording medium in which a is recorded is reproduced and displayed on the high-definition monitor, the screen does not become vertically long, and the image distortion can be improved.

Further, 1035 effective scanning lines are set to 1080
When converting to a book, do not just interpolate
Since the conversion is performed while applying F, when the second input video signal bb related to the high-definition system is displayed on the ATV monitor in the EE mode and when the recording medium on which the second input video signal bb is recorded is reproduced, the second input video signal bb is displayed on the ATV monitor. Even when the image is displayed, the screen is not horizontally long, and the image distortion can be improved.

(Fourth Embodiment) In the third embodiment, a vertical LPF is used.
The scanning line conversion process for deleting a predetermined line while applying the above is completed within the field. However, in the fourth embodiment, the scanning line conversion process is performed for each frame in order to prevent deterioration of resolution in the vertical direction. . The fourth embodiment will be described below with reference to FIGS. 13 to 15. Since the configuration other than the first and second scanning line converting means 1 and 6 is the same as that of FIG. 1, the description thereof will be omitted.

Here, the number of effective scanning lines of the first input video signal aa according to the high-definition system is 1035 lines / frame, but in the following description, the line number is shown in FIG.
13A, and the line number of the second input video signal bb related to the ATV system is shown in FIG. 13B. Also, the M line signal relating to the second input video signal bb is A (M), and the N line signal relating to the first converted video signal obtained by converting this signal is B (N).
Then, the conversion process of the first scanning line conversion means 1 is expressed by Equation 4,
It becomes 5.

In the case of N ≦ 517 B (N) = K1 {(M + 23) mod24} × A (M + 1) + K2 {(M + 23) mod24} × A (M) + K3 {(M + 23) mod24} × A (M-561) ) + K4 {(M + 23) mod24} * A (M-562) + K5 {(M + 23) mod24} * A (M-563) ... Formula 4 However, K1-5 (X) is a coefficient and M is M = N + INT {(N-1) ÷ 23} (INT means integer part) K1 (X) + K2 (X) + K3 (X) + K4 (X) + K
When 5 (X) = 1 N ≧ 563 B (N) = K1 {(M + 13) mod24} × A (M + 1) + K2 {(M + 13) mod24} × A (M) + K3 {(M + 13) mod24} × A ( M-561) + K4 {(M + 13) mod24} * A (M-562) + K5 {(M + 13) mod24} * A (M-563) ... Equation 5 However, K1-5 (X) is a coefficient and M is. , M = N + INT {(N-563) ÷ 23} (INT means integer part) K1 (X) + K2 (X) + K3 (X) + K4 (X) + K
5 (X) = 1.

Specifically, the first scanning line converting means 1 is constructed by the block diagram shown in FIG. In the figure, the 1H memories 120, 122 and 123 delay the input signal by one line, and the 562H memory 120 delays the input signal by 562 lines. And
A (M + 1), A (M), A (M-5) shown in FIG.
61), A (M-562), and A (M-563) are expressed by the formula 4,
5, the output signals of the coefficient means 124 to 128 are added by the adding means 129 to perform vertical LPF based on the five adjacent lines in the frame.

The coefficients K1 to K5 used by the coefficient means 124 to 128 are determined based on the detection result of the motion detecting means 130. That is, K1 = α × K1 ′, K
2 = α × K2 ′, K3 = β × K3 ′, K4 = β × K4
′, K5 = β × K5 ′, α,
β is determined, and K1 ′ to K5 ′ are determined by the positional relationship of the scanning lines as in the third embodiment. More specifically, β is increased and α is decreased in the case of a moving image, and α is decreased in the case of a still image.
Is increased and β is decreased. As a result, in the case of a still image, it is possible to perform conversion while suppressing vertical resolution deterioration by using the scan lines of the in-phase field as well as the scan field of the in-phase field. Since it uses, it can be converted so that motion blur does not occur.

The output signal of the adding means 129 is 24
The H memory 131 absorbs the time lag due to the decrease in the number of effective scanning lines as in the third embodiment.

Next, the conversion process of the second scanning line conversion means 6 will be described. The operation is represented by equations 6 and 7.

When Q ≦ 540 D (Q) = K6 {(M + 23) mod24} × C (P) + K7 {(M + 23) mod24} × C (P-1) + K8 {(M + 23) mod24} × C (P −562) + K9 {(M + 23) mod24} × C (P−563) + K10 {(M + 23) mod24} × C (P−564) Equation 6 However, K1 to 5 (X) are coefficients, and P is P = Q-INT {(Q-1) ÷ 24} (INT means integer part) K6 (X) + K7 (X) + K8 (X) + K9 (X) + K
In case of 10 (X) = 1 Q ≧ 563 D (Q) = K6 {(M + 13) mod24} × C (P) + K7 {(M + 13) mod24} × C (P-1) + K8 {(M + 13) mod24} × C (P-562) + K9 {(M + 13) mod24} * C (P-563) + K10 {(M + 13) mod24} * C (P-564) ... Equation 7 However, K1-5 (X) is a coefficient, P is P = Q-INT {(Q-563) ÷ 24} (INT means integer part) K6 (X) + K7 (X) + K8 (X) + K9 (X) + K
Let 10 (X) = 1.

Specifically, the second scanning line converting means 6 is constructed by the block diagram shown in FIG. In the figure, the second selection signal 5a is written in the 24H memory 630 in the 23H cycle and read in the 24H cycle, as in the third embodiment. That is, during reading, 1H during 24H cycle
By performing read reset on the 2nd and 2nd H, 1035 effective scanning lines are extended to 1080 lines.

Then, the 1H memories 631, 633, 63
No. 4 delays the input signal by one line, 562H
The memory 632 delays the input signal by 562 lines. Further, C (P), C (P-
1), C (P-562), C (P-563), C (P-
564) is the same as each term of the equations 6 and 7, and the coefficient means 12
By adding the output signals of 4 to 128 by the adding means 129, the vertical LPF is performed based on the five adjacent lines in the frame.

Then, based on the detection result of the motion detecting means 641, the coefficient K used by the coefficient means 124-128.
1 to K5 are determined. That is, K6 = γ × K6 ′, K7
= Γ × K7 ′, K8 = δ × K8 ′, K9 = δ × K9 ′,
When K10 = δ × K10 ′, γ,
δ is determined, and K6 ′ to K7 ′ are determined by the positional relationship of the scanning lines as in the third embodiment. More specifically, γ is increased and δ is decreased for moving images, and δ is increased for still images.
To make γ smaller (?). As a result, in the case of a still image, it is possible to perform conversion while suppressing vertical resolution deterioration by using the scan lines of the in-phase field as well as the scan field of the in-phase field. Since it uses, it can be converted so that motion blur does not occur.

[0064]

As described above, according to the configuration of the present invention according to claim 1, the number of effective scanning lines of the second input video signal is converted into the number of effective scanning lines of the first input video signal. Since it has the first scanning line converting means for outputting the first converted video signal, the same recording processing means as the first input video signal is used even for the second input video signal having many effective scanning lines. There is an effect that it can be used and recorded. Further, the second scanning line converting means for converting the number of effective scanning lines of the reproduction signal into the number of effective scanning lines of the second input video signal and outputting the second converted video signal, and the reproduction signal And a means for supplying the second converted video signal to the second output terminal for the second TV system. It is said that a reproduction image can be obtained in a reproduction mode in which a recording medium on which a video signal according to one of the TV systems is recorded is reproduced, even if there is only a monitor according to the other TV system. effective. As described above, according to the configuration of the present invention according to claim 2, in addition to the effect of the invention of claim 1, particularly, the second to fourth
In the recording mode and the EE mode, both of the first and second TV systems can be EE or recorded even if the video signal is recorded in the EE or the recording mode. There is an effect that an image can be displayed on a monitor according to the TV system and the type of the monitor does not matter.

As described above, according to the configuration of the present invention according to claim 3, in addition to the effect of the invention of claim 1 or 2, the first scanning line converting means is thinning means for thinning out effective scanning lines. Since it is configured, there is an effect that the configuration can be simplified.

As described above, according to the configuration of the present invention according to claim 4, in addition to the effect of the invention of claim 3, scanning in which the second scanning line converting means is thinned out by the first scanning line converting means is performed. Since it is composed of the interpolating means for interpolating the average value of the scanning line immediately before the scanning line and the scanning line immediately after the scanning line, even if the lines thinned out at the time of recording are displayed on the monitor according to the second TV system, it can be made inconspicuous, which is advantageous. Since the interpolation is performed using the average value, the boundary between the effective scanning line and the interpolation scanning line becomes natural, which has the effect of reducing image quality deterioration.

As described above, according to the configuration of the present invention according to claim 5, in addition to the effect of the invention of claim 1 or claim 2, the first scanning line conversion means is provided with a high frequency component in the vertical direction. Since at least the vertical low-pass filter for attenuating and the memory means for absorbing the time shift due to the decrease in the number of scanning lines are configured, the recording medium on which the first input video signal is recorded can be used for the monitor according to the second TV system. Even if it is displayed, there is an effect that the image can be displayed without distortion.

As described above, according to the configuration of the present invention according to claim 6, in addition to the effect of the invention of claim 5, the first scanning line converting means is a motion detecting means for detecting a motion amount, and Since the vertical low-pass filter that attenuates the high-frequency component in the vertical direction based on the detection result of the motion detection unit and the memory unit that absorbs the time shift due to the decrease in the number of scanning lines are included, the deterioration of the vertical resolution is prevented. The effect is that the prevented video signal can be recorded and reproduced.

[Brief description of drawings]

FIG. 1 is a block diagram for explaining an embodiment of a video signal recording / reproducing apparatus according to the present invention.

FIG. 2 is a conceptual diagram for explaining scanning lines.

FIG. 3 is a block diagram for explaining a second scanning line converting means in the first embodiment.

FIG. 4 is a block diagram for explaining a second scanning line converting means in the second embodiment.

FIG. 5 is a timing chart for explaining FIG.

FIG. 6 is a block diagram for explaining a first scanning line converting means in the third embodiment.

FIG. 7 is a timing chart for explaining FIG.

FIG. 8 is a conceptual diagram for explaining a conversion operation of the number of scanning lines at the time of recording in the third embodiment.

FIG. 9 is a block diagram for explaining a second scanning line converting means in the third embodiment.

FIG. 10 is a timing chart for explaining FIG. 9.

FIG. 11 is a conceptual diagram for explaining an operation of converting the number of scanning lines during reproduction according to the third embodiment.

FIG. 12 is a conceptual diagram for explaining scanning line conversion of the third embodiment by integrating recording and reproduction.

FIG. 13 is a conceptual diagram for explaining line numbers.

FIG. 14 is a block diagram for explaining a first scanning line converting means of a fourth embodiment.

FIG. 15 is a block diagram for explaining a second scanning line converting means of the fourth embodiment.

[Explanation of symbols]

 1 1st scanning line conversion means 2 1st selection means (selection means) 3 recording processing means 4 reproduction processing means 6 2nd scanning line conversion means 7 3rd selection means 8 4th selection means 1a 1st Converted video signal 2a First selection signal (selection signal) 4a Playback signal 6a Second converted video signal c First output terminal d Second output terminal aa First input video signal bb Second input video signal cc First output video signal dd Second output video signal TT Recording medium

Claims (6)

[Claims] 1. A first input video signal according to a first TV system having a relatively small number of effective scanning lines and a second input video signal according to a second TV system having a relatively large number of effective scanning lines. A video signal recording / reproducing device for selectively recording / reproducing, wherein the number of effective scanning lines of the second input video signal is converted into the number of effective scanning lines of the first input video signal, and the first conversion is performed. First scanning line converting means for outputting a video signal; selecting means for outputting a selection signal obtained by selecting the first converted video signal and the first input video signal; and recording on the selection signal Recording processing means for performing processing and recording on a recording medium, reproduction processing means for performing reproduction processing on a signal obtained by reproducing the selection signal from the recording medium and outputting a reproduction signal, and the effective scanning line number of the reproduction signal The second converted video signal is converted into scan lines by the number of effective scan lines of the second input video signal. And a second scanning line converting means for outputting the reproduction signal to the first output terminal for the first TV system, and the second converted video signal for the second TV system for the second TV system. A video signal recording / reproducing apparatus having means for supplying to an output terminal. 2. A first input video signal according to a first TV system having a relatively small number of effective scanning lines and a second input video signal according to a second TV system having a relatively large number of effective scanning lines. A video signal recording / reproducing device for selectively recording / reproducing, wherein the number of effective scanning lines of the second input video signal is converted into the number of effective scanning lines of the first input video signal, and the first conversion is performed. First scanning line converting means for outputting a video signal, and first selecting means for outputting a first selection signal obtained by selecting the first converted video signal and the first input video signal A recording processing means for recording the first selection signal on a recording medium and a reproduction processing means for performing a reproduction processing on a signal reproduced from the recording medium and outputting a reproduction signal. And selecting the first input video signal and the reproduction signal and outputting a second selection signal. And a second scanning line for converting the number of effective scanning lines of the second selection signal into the number of effective scanning lines of the second input video signal to output a second converted video signal. Converting means; third selecting means for supplying a first output video signal obtained by selecting the reproduction signal and the first selecting signal to a first output terminal for the first TV system; A second output video signal obtained by selecting the second converted video signal and the second input video signal is used as a second TV system second video signal.
And a fourth selecting means for supplying the output signal to the output terminal. 3. A video signal recording / reproducing apparatus according to claim 1 or 2, wherein the first scanning line converting means is constituted by thinning means for thinning out effective scanning lines. Recording / playback device. 4. The video signal recording / reproducing apparatus according to claim 1 or 2, wherein the first scanning line converting means comprises thinning means for thinning out effective scanning lines, and the second scanning line converting means. A video signal recording / reproducing apparatus characterized in that the scanning line converting means comprises an interpolating means for interpolating the average value of the scanning line immediately before and the scanning line immediately after the scanning line thinned out by the first scanning line converting means. 5. The video signal recording / reproducing apparatus according to claim 1, wherein the first scanning line converting means includes a vertical low-pass filter for attenuating a high frequency component in the vertical direction, and a scanning line. A video signal recording / reproducing apparatus, comprising: a memory unit that absorbs a time lag due to a decrease in the number. 6. The video signal recording / reproducing apparatus according to claim 1 or 2, wherein the first scanning line converting means includes a motion detecting means for detecting a motion amount, and a detection of the motion detecting means. A video signal recording / reproducing apparatus comprising: a vertical low-pass filter for attenuating a high-frequency component in the vertical direction based on the result;