JPS61261983A - High definition television receiver - Google Patents

Abstract

PURPOSE:To make a picture quality superior by displaying the velocity of vertical and horizontal frequencies as doubled and processing a motion adaptive interpolation that is different at a still picture part or a moving picture part. CONSTITUTION:Double velocity conversion means 9, 12 and 15 which convert a received television signal of an MUSE system to the television signal having a double vertical and a double horizontal frequencies respectively are prepared and picture images converted from those are displayed on a color picture tube 20. Also, at the double velocity conversion means, an inter-4 fields interpolation means 12 and a within-field interpolation means 9 are provided anda the inte-4 fields interpolation means 12 and the within-field interpolation means 9 are controlled by the output of a means 14 which detects the motion of the picture image. And at the still picture part, a double velocity conversion is performed through the inter-4 fields interpolation means 12 and at the moving picture part, the double velocity conversion is performed through the within-field interpolation means 9. Thus, sufficient resolution power is obtained and deterioration, such as a two-wire disturbance etc., is prevented.

Description

[Detailed description of the invention] The present invention will be explained in the following order.

A. Field of industrial application B. Overview of the invention C. Prior art D. Problem to be solved by the invention E. Means for solving the problem (Fig. 1) F. Effect G. Example (Fig. 1) G1 field Explanation of the interpolation section (Figures 2 and 3) G2
4 Explanation of inter-field interpolation unit (Figures 2 and 4) Explanation of G3 motion amount detection unit (Figure 5) 04 Explanation of double speed conversion unit (Figures 6 and 7) Explanation of G6 motion correction H invention Effect A: Industrial Field of Application The present invention is a high-speed television signal that uses a so-called MUSE television signal, which is a television signal whose bandwidth is compressed by sub-Nyquist sampling and in which four-field screens mutually dot-interlaced are sequentially transmitted. Regarding quality television receivers.

B. Summary of the Invention The present invention provides a high-definition television receiver that uses a so-called MUSE television signal, in which the vertical and horizontal frequencies are displayed at twice the speed and are different between the still image portion and the moving image portion. By performing motion-adaptive interpolation processing, high image quality is achieved.

C Conventional technology High-definition television, for example, has 1125 lines/60 fields, an interlace ratio of 2:11, and an aspect ratio of 5:3.
is displayed using conventional methods, such as NTS
It has about four times the amount of information compared to C format television (525 lines/60 fields, interlace ratio 2:1, aspect ratio 4:3).

Therefore, while conventional televisions do not detect interference at a viewing distance of 7H (H is the screen height) or more, high-definition televisions do not detect interference at a viewing distance of 3H or more. It is said that

D Problems to be Solved by the Invention High-definition televisions still suffer from various disturbances such as Rusk disturbance, line flicker, and large-area flicker (60Hz) at viewing distances of 3H or less, although to a lesser extent. is detected. In particular, large-area flicker becomes a problem as screens become larger and brighter.

FIG. 11 shows the scanning line configuration of a high-definition television, where solid lines indicate odd fields and broken lines indicate even fields. Also, Figure 12 shows the scanning line viewed in the time direction, and Figure 13 shows the high-definition television signal (with little movement) displayed on a two-dimensional (vertical hour) frequency plane. 562.5
cph, an aliasing component exists around the 30 Hz point. This component is normally not perceived at a viewing distance of 3H or more, but is perceived as a disturbing component at a viewing distance of 3H or less.

In addition, in FIG. 13, "○" indicates the turning point of the direct current.

By the way, satellite broadcasting is currently carried out in the 12 GHz band, and each channel has a transmission band of 27M1lz. On the other hand, a typical high-definition television signal is 2
It has a signal band of 0M) lz. If an FM modulation method is used in which the carrier power through analog transmission is constant, the transmission band will need to be about three times the baseband or more.

Therefore, in the case of a normal high-definition television signal, two or more channels of satellite broadcasting are required. Therefore,
A type of band compression method called the so-called MUSE (Multiple Sub-Nyquist Sampling Encoding) method was developed. transmission became possible.

This MUSE television signal is formed as follows. First, a high-definition television signal (
R, G, B primary color signals) to luminance signal Y, wideband color signal C
A narrowband color signal CM is obtained (Fig. 14 A, B, C).
), where signal Y.

C and CN obtain TCI signals line-sequentially time-axis multiplexed in the horizontal blanking period of the luminance signal Y by changing the following equation from the R, G, and B primary color signals (as shown in Figure 14).

Next, this TCI signal is sampled with a 64 MHz clock (sampling points are indicated by "mouths" in FIG. 15).

Next, sub-Nyquist sampling is performed in one cycle in 4 fields using a 16 MHz clock, and the signal band 8'
M) Sll for a little while! A TCI signal, that is, a television signal of the above-mentioned SR system is formed. In FIG. 15, the sampling points indicated by rlJ, r2J, r3J and "4" are respectively the first field, the second field, and
These are the sampling points of the third field and the fourth field, and are in a dot interlace relationship with each other.

Incidentally, in a television receiver that uses such a MUSE television signal, it is expected that different interpolation processing will be performed for the still image portion and the moving image portion, and that images will be displayed using interlaced scanning. .

The present invention is designed to effectively prevent the above-mentioned interferences in a high-definition television receiver that uses such a MUSE television signal.

E Means for solving the problem (Fig. 1) The present invention has the following features:
In order to solve the above-mentioned problems, a double speed conversion means (91, (12)) is provided for converting the received MUSH television signal into a television signal with twice the vertical and horizontal frequencies, respectively.
, (15) and display the image with the converted signal from this. Further, the double speed conversion means has a 4-field interpolation means (12) and an intra-field interpolation means (9), and uses the output of the image movement detection means (14) to
The inter-field interpolation means (12) and the intra-field interpolation means (9) are controlled.

In the still image part, interpolation means between 4 fields (1
2), and in the moving image portion, double speed conversion is performed via intra-field interpolation means (9).

F: Since the image is displayed using the converted signal from the action speed converting means, an image with twice the vertical and horizontal frequencies, that is, an image in which disturbances such as rask disturbance, line flicker, large area flicker, etc. are removed, is displayed. be done. Also, in the still image part,
Since it is converted at double speed through 4-field interpolation means,
Sufficient resolution is obtained, and on the other hand, the moving image portion is double-speed converted via the intra-field interpolation means, so an image free from deterioration such as two-line interference is displayed.

G Following the example, 1st t! An embodiment of the present invention will be described with reference to I.

In the figure, (11 is an antenna, (2) is an FM receiver, this FM receiver (2) is supplied with a 12 GHz band satellite broadcast signal, and from this FM receiver (2),
The television signal SMV of the above-mentioned MtlSE system is obtained. This signal SMV is converted into digital data by an A/D converter (3) and then supplied to a field delay circuit (4). Further, the output of this delay circuit (4) is supplied to a field delay circuit (5), and the output of this delay circuit (4) is supplied to a field delay circuit (5).
The output of 5) is supplied to a field delay circuit (6), and the output of the field delay circuit (6) is further supplied to a field delay circuit (7). Field delay circuit (4)
~(7) are configured with field memories, for example.

As mentioned above, the signal SMV is transmitted from the first field to the fourth field.
It is a signal that goes around in four fields. For example, when the signal of the first field is supplied as an input to the delay circuit (4), the delay circuit (4), (5).

As the outputs of (6) and (7), the fourth field,
Signals of the third field, the second field and the first field are obtained.

In addition, the signal SMV converted into digital data by the A/D converter (3) is supplied to the synchronization separation and clock recovery circuit (8), and this circuit (8) supplies the clock for A/D conversion and other systems. Clock (64MHz.

128MHz etc.) is generated and supplied to each part of the circuit.

G1 Explanation of Intra-Field Interpolation (FIGS. 2 and 3) Also, (9) is an intra-field interpolation unit that generates signals that mainly constitute the scanning lines of the moving image portion.

This interpolation unit (9) is supplied with a signal SMV (current field signal) from the A/D converter 5 (3). and,
In this interpolation section (9), interpolation pixels are determined based on the pixels transmitted in the current field. In this case, for one transmitted pixel, a total of seven pixels, three on the same line and four on the adjacent line, are interpolated.

Here, FIG. 2A shows the pixels transmitted by the signal SMV, and the pixels indicated by rlJ, r2J, r3J, and "4" are the first field, the second field, the third field, and the fourth field, respectively. It is a pixel that is transmitted by
” pixels are not transmitted. Furthermore, this figure 2 A
corresponds to FIG. 15.

Therefore, when the signal SMV is in the first frame, the interpolation unit (
9), the pixels are interpolated as shown in FIG. 2B. In the figure, the portion indicated by rOJ is the interpolated pixel.

And in this case, 1, 3, 5. The pixels of the line ... constitute the scanning line of the regular field, but
2, 4, 6. The pixels in the lines (arrows) constitute the scanning lines of the interpolation field.

Note that interpolation is performed in the same way at the second, third, and fourth frames.

Here, FIG. 2C shows an example of interpolation when the vertical and horizontal frequencies display a normal image.

FIG. 3 shows a specific circuit of the interpolation section (9).

Signal S? lV is supplied to a dot line delay line (91), and from this delay line (91), the transmitted predetermined pixel ao and the pixels a1 to aG in its vicinity (for example, within 5 lines) are
are output in parallel. 7 output from the delay line (91)
The point pixel aQ''-'aQ is weighted by the adder (921) ~
(927), and these adders (921) to (9
2v), seven interpolation pixels b1 to bv ("○" in FIG. 2B) are obtained. These interpolation pixels b1 to b1 and a predetermined pixel aO ("l" in FIG. 2B) are stored in output shift registers (931) and (932) corresponding to the scanning line of the normal field and the scanning line of the interpolation field, respectively. loaded into.

These shift registers (931) and (932)
) is supplied with a 64 MHz clock and outputs each loaded pixel. Therefore, since the above operations are repeated in sequence, the normal field scanning line signal A1 and the interpolation field scanning line signal A2 are obtained in parallel from the shift registers (93s) and (932), respectively.

Signals A1 and A2 obtained from this interpolation section (9) are supplied to an adder (11) via a multiplier Ql.

G24 Description of inter-field interpolation unit (Figures 2 and 4) Also, (12) is a 4-field interpolation unit that generates signals that mainly constitute the scanning line of the stationary part.This interpolation unit (12) is the signal SMV(
current field signal), output signal SM of the delay circuit (4)
VI (signal of one field before), output signal SMV2 of delay circuit (5) (signal of two fields before), and output signal SMV3 (signal of three fields before) of delay circuit (6) are supplied. In this interpolation section (12), interpolated pixels are determined by also considering the pixels previously transmitted to three fields. In this case, four pixels are interpolated for one transmitted pixel.

Here, in odd-numbered frames, pixels are interpolated by the interpolation unit (12) as shown in the second diagram. In the same figure, "○"
The part indicated by is the interpolated pixel.

And in this case, 1.3, 5. The pixels in the lines 2, 4, 6, . . . constitute the scanning lines of the regular field. The lines (arrows) constitute the scanning lines of the interpolation field.

Note that interpolation is similarly performed for even frames as well.

Here, FIG. 2E shows an example of interpolation when the vertical and horizontal frequencies display a normal image.

Also at this time, the interpolation pixel rOJ is determined based on the pixels between four fields.

FIG. 4 shows the specific configuration of the interpolation section (12). Signal SMV, 5sv1. SMV2 and SMV3
are the dot line delay lines (1211) and (1
212).

(1213) and (1214). These delay lines (1211), (1212), (12
13) and (1214), the predetermined pixels CIO C20, C30, C0 transmitted in the respective fields
and its neighboring pixels CL'LA-CL3+C21""
21.031''' C33 and C41 to C43 are output in parallel. Pixels C10 to 043 output from the delay lines (12h) to (1214) are weighted by the adder (1
221) to (1224), and these adders (1
221) to (1224), four interpolation pixels d1 to (1
+ (“○” in the second diagram) is obtained. This interpolation pixel d1
~d4 and a predetermined pixel CIO~C40 (“1” in the second diagram)
'' to "4") are loaded into output shift registers (1231) and (1232) corresponding to the scanning line of the normal field and the scanning line of the interpolation field, respectively. And these shift registers (1231) and (1232)
is supplied with a 64 MHz clock, and outputs each loaded pixel. Therefore, since the above operations are repeated in sequence, the normal field scanning line signal B1 and the interpolation field scanning line signal B2 are obtained in parallel from the shift registers (1231) and (1232), respectively.

Signals B1 and B2 obtained from this interpolation section (12) are
It is supplied to an adder (11) via a multiplier (13).

G3 Description of Motion Amount Detection Unit (FIG. 5) Further, (14) is a motion amount detection unit that detects the movement of an image. This motion amount detection section (14) includes an A/D converter (
3) signal SMV (signal of current field), output signal SMV2 of delay circuit (5) (signal of 2 fields before)
and the output signal SMV4 (signal 4 fields before) of the delay circuit (7) are supplied. In this motion amount detection section (14), signals SMV, SMV2, SMV4
The degree of movement for each pixel (interpolation unit) is detected from the tK, and this is output as a movement tK (0≦to≦1).

In a completely stationary part, =O, and in a completely moving part, =1. Further, at the boundary between the moving part and the stationary part, K is set to an intermediate value between 0 and 1 so that this boundary is not noticeable. This motion amount detection section (14) is configured as shown in FIG. 5, for example.

Signals SMV and SMV4 are supplied to combiners (14h) and (1412), respectively. In addition, these synthesizers (1
4h) and (1412) are supplied with the signal SMV2, respectively. Further, a composite signal of signals SMV and SMV2 obtained from the synthesizer (1411) is supplied to a subtracter (1431) through a two-dimensional spatial low-pass filter (1421). Further, the signal SMV2 is supplied to this subtracter (1431) through a two-dimensional spatial low-pass filter (1422). And this subtractor (1431) -
The difference signal from is converted into an absolute value by an absolute value circuit (1441) and is supplied to a maximum value selection circuit (145). Also, the signals SMV2 and SMV4 obtained from the combiner (1412)
The composite signal is passed through a two-dimensional low-pass filter (1423)
is supplied to the subtracter (1432) through the subtractor (1432). Further, the subtracter (1432) is supplied with a signal obtained through a two-dimensional low-pass filter (1421) of the composite signal obtained from the combiner (1411). And this subtractor (143
The difference signal from 2) is converted into an absolute value by an absolute value circuit (1442) and supplied to a maximum value selection circuit (145). Further, the output of the maximum value selection circuit (145) is supplied to the field delay circuit (146). This field delay circuit (
146), the amount of motion K in the previous field is obtained, and this is multiplied by a constant coefficient between θ and 1 (for example, 0.5 to 0.7) in a multiplier (147), and then the maximum value It is supplied to a selection circuit (145), and the one selected by the maximum value selection circuit (145) is output as the amount of motion.

In addition, in FIG. 5, the synthesis circuit (14h).

The reason why the signals are combined in step (1412) is to smooth the boundary between the stationary part and the moving part. Also, low-pass filters (1421), (1422), (1
423) is used to smooth the spatial distribution of the amount of motion and to match the deviations of the images S (sampling points) of each field.

The motion fK output from the motion amount detection section (14) is supplied to the multiplier Ql and (13). Then, the multiplier α1 multiplies the signals A1 and A2 by K, and outputs the signals KA1 and K A 2. On the other hand, in the multiplier (Step 3),
Signals B1 and B2 are multiplied by (1-K), and the signal (1-K) is multiplied by (1-K).
K)Bs and (IK)B2 are output.

Further, in the adder (11), the signals K A 1 and K A
2 and signals (IK) B1 and (1-K) B2 are added, respectively, to obtain signals C1-KAl and (IK) Bl and C2-K.
A2 + (I K)B2 is obtained.

These signals C1 and C2 are supplied to a double speed converter (15). Here, at K=0 (completely stationary part), CI=
81. C2=82, and the double speed conversion section (15) receives the signal B1. from the interpolation section (12). B2 is supplied. on the other hand,
For K=1 (complete motion part), Ct - At , C2
-A2, and the double speed converter (15) receives the signal A1.-A2 from the interpolator (9). A2 is supplied.

When K is an intermediate value between 0 and 1, the signals A1 and A2 from the interpolation section (9) and the signal B1 from the interpolation section (13)
゜The weighting of B2 according to K is added, and the double speed conversion unit (
15).

Explanation of the G4 double speed converter (Figs. 6 and 7) Furthermore, in the double speed converter (15), two series of parallel signals, that is, the signal C1 of the normal scanning line and the signal C2 of the interpolated scanning line, are converted into horizontal The frequency is converted to a double speed signal (67.4kHz).

This double speed converter (15) is configured as shown in FIG. 6, for example.

The signal C1 is supplied as write data to the field memory (152a) and line memory (152c) via the A side and B side of the changeover switch (15h). On the other hand, signal C2 is A of the changeover switch (1512).
Field memory (152b) through side and B side
and (152d) as write data.

Further, a 64 MHz clock CLK synchronized with the signals C1 and C2 is connected to the field memory (152a) via the A side and B side of the changeover switch (1513).

(152b) and field memory (152c)
.

(152d) is supplied as a write clock.

In addition, 128 which has twice the frequency of the clock CLKW
MHz clock CLKR is the changeover switch (151
4) Field memory (15
2c).

(152d) and field memory (152a)
).

(152b) as a read clock.

Also, field memory (152a), (15
2b).

The signals read from (152c) and (152d) are supplied to fixed terminals on the B side, b side, C side, and d side of the changeover switch (153), respectively.

Also, selector switch (1511), (1512)
.

(1513) and (1514) are controlled in conjunction, and as shown in FIG. 7A, are switched to the A side and the B side every one vertical period (1v). Further, the changeover switch (153) is sequentially switched from side a to side d every 1/2V at the timing shown in FIG. 7B.

With the above configuration, selector switches (15h) to (1514
is connected to the A side, the field memory (15
2a) and (152b), one field of signals C1 and C2 is written at normal speed (64 MHz), respectively. Also, in the first half of this IV, field memory (152
c), one field of signal C1 is at double speed (128
MHz), and in the latter half, one field of signal C2 is read out from the field memory (152d).
Read out at double speed. In addition, the changeover switch (1511)
Similarly, in 1■ where ~(1514) is connected to the B side,
Field memory (152c) and (152d)
Normal speed writing of signals C1 and C2 is performed in the field memories (152a) and (152b).
), signals C1 and C2 are read out at double speed. Therefore, a double-speed signal S2MV (shown in FIG. 7G) having twice the vertical and horizontal frequencies is obtained from the changeover switch (153). In addition, Figure 7 C, D, E and F
are field memories (152a) and (
152b), (152c) and (152d)
It shows the status of.

) Also, the signal S2M obtained from the double speed converter (15)
V is converted into an analog signal by the D/A converter (16Y) and then supplied to the matrix circuit (17). In addition, signal S
Since MV is a TCI signal in which the color signals C and CM are multiplexed during the horizontal blanking period of the luminance signal Y, the double speed signal S
2MV is also a similar TCI signal.

Further, the double speed signal S2MV is supplied to a color demodulation circuit (18), and a red difference signal RY and a blue difference signal B-Y are obtained from this color demodulation circuit (18). Then, the respective color difference signals R-Y and B-Y are sent to the D/A converter (16R) and (
16B> is supplied to the matrix circuit (17).

Therefore, from the matrix circuit (17), red, edge and blue primary color signals R2, G with twice the vertical and horizontal frequencies, respectively.
2 and B2 are obtained, and the amplifiers (19R) and (
Color picture tube (20) via (19G) and (19B)
supplied to

Further, the synchronization separation and clock recovery circuit (8) generates a horizontal interphase signal P2H having twice the normal frequency (67,4k)lz), which is transmitted to the horizontal deflection circuit (21)1.
). And this horizontal deflection circuit (21H
') supplies a deflection signal to the deflection coil (22) of the picture tube (20), and horizontal deflection scanning is performed at twice the normal speed. In addition, from the circuit (8), the frequency (1
A vertical synchronizing signal P2V having a frequency of 20 Hz) is generated and is supplied to the vertical deflection circuit (21 V).

The picture tube (
A deflection signal is supplied to the deflection coil (22) of 20), and vertical deflection scanning is performed at twice the normal speed.

In this way, the picture tube (20) is supplied with the primary color signals R2, G2, and B2 whose vertical and horizontal frequencies are twice as high, and their vertical and horizontal deflection scans are performed at twice the speed, so that the picture tube (20) receives the image. An image with twice the vertical and horizontal frequencies is displayed on the screen of the tube (20), as shown in FIGS. 8 and 9. In FIG. 8, solid lines indicate scanning lines for odd fields and broken lines indicate scanning lines for even fields.

In this case, in the still image part (K is close to 0), the signal Bl from the 4-field interpolation unit (12),
Since the signal B2 is supplied to the double speed converter (15), the displayed image is mainly the signal B1.

This is due to B2. On the other hand, in the moving image part (K is close to 1), the signal A! is mainly sent from the intra-field interpolator (9). , A2 are supplied to the double speed converter (15), so the displayed image is mainly based on the signals A1°A2.

According to this example, the vertical and horizontal frequencies are each 2.
Since the image is displayed twice, an image free from raster disturbance, line flicker, and large area flicker is displayed. 1st
Diagram O shows the double-speed signal (with little movement) in this example on a two-dimensional (vertical hour) frequency plane, but it also contains components that cause raster disturbance, line flicker, and large-area flicker (see the dashed line diagram). has been removed.

Furthermore, according to this example, in the still image portion, an image based on the signal B1+82 from the 4-field interpolation unit (12) is mainly displayed, so that an image with sufficient resolution can be obtained. On the other hand, in the moving image part, the signals A1. Since an image based on A2 is displayed, an image free from deterioration such as two-line interference due to time difference is displayed.

G5 Explanation of Motion Correction By the way, as explained above, when the processing is adapted to the movement of the image, a problem arises when the entire screen moves in one direction. This condition occurs when the camera pans slowly, and the human visual system moves the viewpoint to match the movement of the scene, so the resolution is almost the same as when the screen is stationary. . However, since the motion amount detection unit (14) determines that it is a moving part, the signal A i from the intra-field interpolation unit (9) is mainly
An image with r A 2 is displayed, with reduced resolution. The resolution of the visual system also decreases during normal motion, so
Although the reduction in screen resolution is not noticeable, in this case, the resolution of the visual system remains the same as when the screen is stationary, giving the impression that the screen is blurred.

Therefore, in this example, such defects are also prevented.

In FIG. 1, (23) is a motion vector decoder, and this decoder (23) includes an A/D converter (3).
The signal SMV is supplied from Although not mentioned above, during the vertical blanking period of the signal SMv, the movement itM (horizontal and vertical two components) of the entire screen is digitally coded and multiplexed.

The decoder (23) detects this motion amount M, and uses this motion amount M to control the read addresses of the delay circuits (4) to (7) (the write address is constant).

That is, the pixel positions of each field are shifted and output according to the amount of motion M, so that corresponding pixels overlap.

Therefore, when the entire screen moves slowly in one direction, the motion amount detection section (14) determines that it is a stationary portion, and mainly receives the signal B1. B2
Since an image is displayed based on the image quality, blurring as described above can be prevented.

In addition to the above-described embodiment, a configuration using a two-beam type picture tube may also be considered. In this case, writing is performed in the same way in the double speed converter (15) shown in FIG. 6, but the field memories (152a) to (152d
), the signals of the same field are read out twice in succession. Field memories (1
52a) to (152d) are shown. And, although not shown, field memory (152a)
and (152c), and a first changeover switch that switches the readout output of (152c) every 1■, and a field memory (152b).
) and (152d) are provided, and signals S1 and S2 as shown in FIGS. 7 and M are obtained, respectively. Then, by these signals S1 and S2, the first and second
beams are controlled, and scanning lines 1-563 and 563-1125 are formed simultaneously by the first and second beams (see FIGS. 8 and 9). Therefore, in this case,
Vertical and horizontal frequencies are each doubled and 1 to 1 in one field.
A non-interlaced display is performed in which 1125 scanning lines are displayed. In this case too.

Since the vertical and horizontal frequencies are displayed twice, the first
The same effects as in the illustrated example can be obtained.

H Effects of the Invention According to the invention described above, since an image is displayed with twice the vertical and horizontal frequencies, it is possible to obtain a high-quality image free of raster disturbance, line flicker, and large-area flicker. Moreover, since the still image portion is converted at double speed through the 4-field interpolation means, an image with sufficient resolution is displayed, and the moving image portion is converted at double speed through the intra-field interpolation means. An image free from deterioration such as line interference is displayed.

[Brief explanation of drawings]

The first broken vinegar umbrella ticket is a block diagram showing an embodiment of the present invention, FIG. 2 is a diagram for explaining interpolation, FIG. 3 is a block diagram of the intra-field interpolation section, and 4-field interpolation section, FIG. 5 is a block diagram of the motion amount detection section, FIG. 6 is a block diagram of the double speed conversion section, FIG. 7 is a time chart for explaining the same, and FIGS. 8 to 10 The figure is a diagram for explaining one embodiment, Figures 11 to 13 are diagrams for explaining a conventional example, and Figures 14 and 15 are diagrams for explaining a MUSE system television signal. be. (2) is an FM receiver, (4) to (7) are field delay circuits, (9) is an intra-field interpolation unit, Ql and (13)
is a multiplier, (12) is a 4-field interpolation unit, (14)
is a motion amount detection unit, (15) is a double speed conversion unit, (20) is a color picture tube, (21) 1) is a horizontal deflection circuit, (21V)
is a vertical deflection circuit. Configuration diagram of N$ Liao I God in the field Figure 3 4ys-rud M4MMhrra, tuBMULE TV
n f err T! , Mingyuan Figure 14 MULE TV if + n"L Ming times bite - t & tjps Jlx 岨 5 Figure 6 Figure 03'7 crystal-m-1-111-1-mo-・F 6L'
ct) -----1-mo-ko-yo-1-G (Szpt
y) (j C2CI C2(1C2C+ C
2Ke, :;,, ta ti Ta ↑
Telephone call of P, who encountered the incident, was sent to the station in time. Figure 7. Figure 8. 1] Shiakejiwa Figure 10 ffJ? 廚水下 [Hzl It + formula division clear diagram Figure 13

Claims (1)

[Scope of Claims] Means for receiving a television signal in which the band is compressed by sub-Nyquist sampling and sequentially transmits four-field screens dot-interlaced with each other; A doubling speed converting means for converting into a television signal of twice the speed, and a means for detecting a movement of an image from the television signal are provided, and the doubling speed converting means has an interpolation means between four fields and an interpolation means within a field. , the output of the motion detection means controls the four-field interpolation means and the intra-field interpolation means, and in the still image portion, double speed conversion is performed via the four-field interpolation means, and in the moving image portion, the above-mentioned field A high-definition television receiver characterized in that double speed conversion is performed through internal interpolation means.