JPH03117288A - Additional information multiplex transmitter and additional information multiplex receiver - Google Patents

Abstract

PURPOSE:To improve the utilizing efficiency of a transmission line and to prevent the S/N of the receiver side by discriminating the presence of a vertical high frequency component over a prescribed level or over in a substantial horizontal transmission band, multiplexing a horizontal minute component at the sender side in the case of the absence only, reproducing the area into the original area at the receiver side and reproducing the signal. CONSTITUTION:An area in which fx[MHz] is 4-6 and fy[cph] is 0-525/8 is an area in existence of YH. A vertical high frequency component having a prescribed level or over is discriminated for an area I in which fx is 0-2 and fy is 525/8-(3X525)/8 and an area II in which fx is 2-4 and fy is 525/8-(3X525)/8 is a multiplex area of YH. In the case of multiplexing the YH, actually the presence of the component of a prescribed level or over is discriminated from not only the area I but also from the area II. When the component does not exist in both the areas, the YH is multiplexed as it is onto the area II, and when the area I has the component but the area II does not have the component, after the component of the area II is eliminated, the YH is multiplexed and the result is processed according to a prescribed algorithm. Through the constitution above, the additional information transmitter/receiver is obtained, in which the horizontal minute component is multiplexed and reproduced effectively.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention provides an additional information multiplexing transmission device that multiplexes and transmits a wideband luminance signal, and a luminance signal sent from this multiplexing device. The present invention relates to an additional information multiplex reception device that receives and reproduces the original wideband luminance signal.

(Prior art) In the NTSC system, which is one of the television broadcasting systems, the number of scanning lines is 525 and the horizontal transmission band is 4.2 MH.
It is specified in z.

Since the effective number of scanning lines in the NTSC system is 482, it is possible to set a vertical resolution of 480 (lines/screen height) in this NTSC system.

On the other hand, the horizontal resolution is limited by the horizontal transmission bandwidth,
The theoretical limit is about 330 (books/screen height).

However, since the NTSC system uses an interlaced system, the vertical resolution is 480 (lines/screen height).
can only be achieved for still images, and is lower than this for moving images. Although the vertical resolution of videos decreases,
Numerical values are far from established, and are thought to be around 300 (book/screen height).

Regarding horizontal resolution, it is approximately 300 regardless of whether it is a still image or video.
Book/degree.

Therefore, considering the horizontal and vertical balance of the image,
It is desirable to increase the horizontal resolution of still images to 400 to 480 (lines/screen height). For this purpose, the equality constraint requires 0 to
A broadband luminance signal of 5 or 0 to 5 MHz is required.

One way to improve the horizontal resolution of still images is to convert components exceeding 4 MHz, which can normally be transmitted, from a wideband luminance signal of 0 to 5 or 0 to 6 MHz to a bandwidth of 1 to 2 MHz.
A known method is to multiplex signals into signals having components of 4 MH2 or less as Hz detail components, thereby realizing a multiplexed signal compatible with conventional NTSC signals.

One example of this method is rT, Punukl, e.
t.

“Experiments on proposed
Extended-Derlnitl.

n TV vlth full NTSC Col1pa
t111ty” SMPTIE Journal, o
ct, 1984. I) 923-929 J (hereinafter referred to as
There is a method described in Reference 1).

The method described in this document 1 limits the vertical spectra of color difference signals 1 and Q to 1/2 that of the NTSC system to create an empty area in the spectral domain, and multiplexes horizontal detail components there. .

Another example of this method is the method described in Honda et al., "Characteristics of Luminance Signal Expansion in HDTV," 1987 National Conference of the Television Society, Proceedings P317-318J (hereinafter referred to as Document 2).

The method described in this document 2 deletes a portion of the oblique high-frequency components of the luminance signal to create an empty area in the spectral domain, which is used as a multiplex area for horizontal detail components.

In both of the above two examples, components that reduce visual sensitivity, in other words, components that have a low visual contribution to image quality are deleted, and horizontal detail components are multiplexed instead, which is an extremely clever technique. I can say that.

Incidentally, although the horizontal detail component having a spectrum of 4 to 6 MHz is certainly an effective component for improving image quality, its effect is not exhibited in all screens. In other words, it is more realistic to say that the effect of using horizontal detail components is only for some images that have many horizontal high-frequency components.

However, in both of the above two conventional methods, regardless of the effect of using horizontal detail components,
It can be said that redundancy is high because a sky spectral region is secured for multiplexing horizontal detail components.

Furthermore, since the receiving side always performs demodulation processing assuming that there is a horizontal detail component in the multiplexed region, noise power increases. However, if you look at the screen as a whole,
Since the horizontal detail signal is contained only in a very small portion of the image, the visual S/N ratio deteriorates.

In this way, in a configuration in which horizontal detail signals that occur less frequently are constantly transmitted, significant losses occur both in terms of the utilization efficiency of the transmission path and in terms of the S/N ratio on the receiving side.

(Problems to be Solved by the Invention) As described above, conventional systems have a configuration in which horizontal detail components are constantly multiplexed and reproduced, even though the occurrence frequency of horizontal detail components is low. For,
The problem of low utilization efficiency of the transmission path and the S/N on the receiving side
There was a problem that the ratio deteriorated.

Therefore, this invention aims to improve the utilization efficiency of the transmission path and the S of the receiving side.
An object of the present invention is to provide an additional information multiplex transmission device and an additional information multiplex reception device that can multiplex and reproduce horizontal detail components without reducing the /N ratio.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention determines the presence or absence of vertical high frequency components of a predetermined level or higher in the original horizontal transmission band, and Only when there is no vertical high-frequency component, the transmitting side multiplexes the horizontal detail components, and the receiving side returns the horizontal detail components to the original region to generate a wideband luminance signal having the original expanded horizontal transmission band. 79, the playback process is performed to reproduce the data.

However, in this case, the multiplex area and the determination area are set to different areas.

(Operation) According to the above configuration, instead of always deleting a part of the original transmission band, the horizontal detail component is multiplexed only when a spectral region that does not originally exist in this band is found. It is possible to improve the efficiency of using the transmission path.

Furthermore, since the horizontal detail component reproduction processing is not always performed on the receiving side, it is possible to prevent the reception S/N ratio from dropping unnecessarily.

In addition, despite the configuration in which horizontal detail components are multiplexed and reproduced only when the condition that vertical high-frequency components of a predetermined level or higher do not exist in the judgment area, this condition is Since this matches the conditions for obtaining the improvement effect, the horizontal resolution can also be sufficiently increased.

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

FIG. 1 is a circuit diagram showing the configuration of an embodiment of a multiplexed information additional transmission apparatus according to the present invention. Similarly, FIG. 2 is a circuit diagram showing the configuration of an embodiment of the multiplex information addition receiving apparatus of the present invention.

Before specifically explaining FIGS. 1 and 2, the horizontal detail component multiplexing and reproduction algorithm of one embodiment will be explained using the two-dimensional frequency domain diagram of FIG. 3. Here, the horizontal axis represents the horizontal frequency f, and the vertical axis represents the vertical frequency f.

In FIG. 3, the horizontal band is 0 to 4 [MHz], and the vertical band is 0 to 525/2 [cphl], which is the transmission band of the NTSC system. The horizontal band ranges from 4 to 6 [MHz], and the vertical band ranges from 0 to 525/8 [cphl], where the horizontal detail component Y11 exists.

In the NTSC transmission band, the horizontal band is 0 to 2 [MHz
], the vertical band is 525/8 ~ (3X525)/8 [
The region l defined by cphl is a determination region for determining whether or not there is a vertical high frequency component of a predetermined level or higher.

In addition, the horizontal band is 2 to 4 [MHz], and the vertical band is 525
/8 to (3X525)/8 [A region (2) defined by cphl is a multiplex region of horizontal detail component Yl+.

In such area setting, on the transmitting side, the determination area I
It is determined whether a component of a predetermined level or higher exists in the area, and only when it does not exist, the horizontal detail component YII is
If it exists, do not multiplex it. Similarly, on the receiving side, only when there is no component of a predetermined level or higher in determination area 1, the component of area ■ is returned to the original area, and 0 to 6 M
A reproduction process is performed to obtain a wideband luminance signal Y having a horizontal transmission band of Hz, and if it exists, this reproduction process is not performed.

Note that when multiplexing the horizontal detail component YII, in reality, it is not only determined whether a component of a predetermined level or higher exists in the region I, but also whether a component of a predetermined level or higher exists in the region H. It is supposed to be done. And area 1. If there is no component of a predetermined level or higher in II, the horizontal detail component (Y ++ ) is directly multiplexed into multiplex region (2). On the other hand, if there is no component higher than the predetermined level in region I and a component higher than the predetermined level exists in region H, the horizontal detail component Y11 is multiplexed after removing the component in region ■. .

This multiplex algorithm is shown in FIG. Here, "Yes"
is area 1. Indicates a case where a component of a predetermined level or higher is present in II, and "absent" indicates a case where it does not exist.

In this way, when a component of a predetermined level or higher exists in the multiplex region H, this component is removed by subjecting the mixed signal of the horizontal detail component Y□ and the NTSC signal to reproduction processing on the receiving side. This is to reduce the possibility that an erroneous signal will be reproduced.

In addition, by deleting the component of the multiple region ■, the NTSC
Diagonal components of the signal may be removed.

However, the condition that there is no component at a predetermined level or above in area I and a component at a predetermined level or above exists in area ■ is considered to occur less frequently in general images, so it is especially No problem. Also, multiple area H
The component is a component in which image quality deterioration is relatively difficult to notice, and from this point of view, it is considered that the effect of deleting the component of the multiplex region H is small.

Now, the additional information multiplex transmission apparatus shown in FIG. 1 will be explained.

In the figure, a broadband luminance signal Y of 0 to 6 MHz is input to an input terminal 11. This broadband luminance signal Y is passed through a horizontal bypass filter (hereinafter referred to as H-HPF) 1
2 and an adder circuit 13 into a current component having an NTSC horizontal band of 0 to 4 MHz and horizontal detail components Y and I having a horizontal band of 4 to 6.

Further, the wideband luminance signal Y is filtered by a vertical bypass filter (hereinafter referred to as V-HPF) 14, a horizontal low-pass filter (hereinafter referred to as H-LPF) 15, a horizontal band-pass filter (hereinafter referred to as H -BPF) 16 separates the component into the component of the determination region 1 and the component of the multiplex region 2.

Here, the V-HPF is a filter whose passband center frequency is 525/4 [cphl. H-LP
F15 is a filter with a passband of 0 to 2 MHz. The H-BPF 16 is a filter with a pass band of 2 to 4 MHz.

The output of the H-LPF 15 is supplied to a threshold value determination circuit 17. The threshold value determination circuit 17, for example, takes the absolute value of the input signal and determines whether it is less than or equal to a predetermined threshold value. That is, it is determined whether or not there is a component greater than or equal to the threshold value in the determination region I. The output of the H-BPF 16 is supplied to a threshold value determination circuit 18 . Like the threshold value determination circuit 17, this threshold value determination circuit 18 also determines whether or not there is a component equal to or higher than the threshold value in the area (3).

The judgment output of the threshold judgment circuit 17 is sent to the switch circuit 19.
The signal is supplied to the switch circuit 20 via.

This switch circuit 20 is a judgment area! When there is no component equal to or higher than the threshold value, the device is in the on state, and when there is a component, the device is in the off state. As a result, when there is no component greater than the threshold value in region I, the horizontal detail component Y 11 output from the adder circuit 13 is supplied to the multiplex modulation circuit 21 . The multiplex modulation circuit 20 modulates the input signal and shifts it to the multiplex region (2).

Note that the on/off control of the switch circuit 20 is performed only in the still image area. This is done by turning on the switch circuit 19 only in the still image area based on the motion detection signal MD output from the motion detection circuit 22.

Here, the motion detection circuit 22 detects the motion of the image from the human-powered broadband luminance signal Y, and supplies the detection output to the switch circuit 19 as a control signal.

Next, the judgment outputs of the threshold judgment circuits 17 and 18 are supplied to the judgment circuit 23. Based on the determination outputs of the threshold value determination circuits 17 and 18, this determination circuit 23 determines whether or not a component equal to or higher than the threshold value exists in the multiplexed region H in a state where no component equal to or higher than the threshold value exists in the determination region I. Determine.

This determination output is supplied to the switch circuit 24 as a control signal.

The switch circuit 24 selects the output of the H-LPF 12 when there is no component equal to or higher than the threshold value in the judgment region I and there is no component equal to or higher than the threshold value in the multiplexed region H, and applies this to the multiplexed region H. If such a component exists, the output of the two-dimensional band-elimination filter (hereinafter referred to as 2D-BEF) 25 is selected. This 2D-BEF24 is H-
The component of multiplex region H is removed from the output of LPFI2.

The selected output of the switch circuit 24 is fed to an adder circuit 26 (0). In this adder circuit 26 , the selected output of the switch circuit 24 and the modulated output of the multiplex modulation circuit 21 are added. This addition signal is sent to the adder circuit 27 The carrier color signal C is supplied to the color difference signal 1.Q input from the input terminals 28 and 29 and is added to the carrier color signal C. The addition output of the addition circuit 27 is supplied to the output terminal 31.

With the above configuration, in the still image area, when there is no component equal to or higher than the threshold value in the determination area I, the horizontal detail component Y11 is shifted to the multiplex area H by modulation processing,
It is multiplexed into this multiplex area (2) as Y, 1'. At this time, if there is a component greater than the threshold in the multiple region ■,
After removing this component, the horizontal detail component Y11 is multiplexed.

FIG. 5 is a circuit diagram showing an example of a specific configuration of the multiplex modulation circuit 21. As shown in FIG.

Before entering into the explanation of FIG. 5, the modulation carrier wave used in the multiplex modulation circuit 21 will be explained using FIG. 6.

The horizontal axis in FIG. 6 represents the field direction (temporal direction) of the scanning line, and the vertical axis represents the vertical direction of the scanning line.

Now, the carrier phase of the m-th line of the n-th field is φ[r
ad]. If the carrier frequency fc is set to an integral multiple of the horizontal synchronization frequency fH [Hz], each field,
The carrier wave phases of each line are all equal. On the other hand, the signal with the best frequency and phase stability in the receiving device is the color subcarrier.

Therefore, the carrier frequency fC is the color subcarrier frequency f
By setting the relationship between at and a rational number, a stable carrier wave can be reproduced in the receiving device. In this embodiment, the relationship f,=16/7f, and c=520f++ are set.

In order to shift the horizontal detail component Y11 to the multiplex region (2) using a carrier wave having such a frequency f, in this embodiment, the phase of the carrier wave is set as shown in FIG. That is, when the phase of the m-th line of the n-th field is set to φ, the phases of the m-1st line and the m+1th line are set to φ-π and φ+π, respectively, so that the phases are inverted. Also, in the n+1th field,
The phase of the m+262nd line is set to φ, the phase of the m+263rd line is set to φ+π, and in the n+2nd field, m
The phase of the m+525 line is set to φ.

Now, using such a carrier wave, the horizontal detail component Y
The configuration of the multiplex modulation circuit 21 that modulates H will be explained with reference to FIG.

In the figure, a horizontal detail component Y input from an input terminal 41 is modulated by a multiplier circuit 42 using a carrier wave of frequency fc. As a result, a signal located in the multiplex region H is obtained. After unnecessary components are removed from this signal by the H-L P F 43, a horizontal detail signal Y1. ' is supplied to the output terminal 44.

The carrier wave supplied to the multiplication circuit 44 is generated as follows.

First, a phase-locked loop circuit (hereinafter referred to as a PLL circuit) 46 synchronizes the frequency 16/7f with the color subcarrier input from the input terminal 45.

signal is generated. In this PLL circuit 46, 4
61 is a 1/7 frequency division circuit, 462 is a 1/1 detection circuit (PD), 463 is an LPF, 464 is a voltage controlled oscillator circuit (V CO), and 465 is a 1/16 frequency division circuit. It is a circuit.

The 16/7f signal outputted from the PLL circuit 46 is inverted for each frame by an inverting circuit 48 and a switch circuit 49 according to a pulse of a frame period (frequency fp) inputted from a terminal 47. The output of the switch circuit 49 is inverted line by line by an inversion circuit 50 and a switch circuit 51 in accordance with a pulse of a horizontal scanning period (frequency fo) input from a terminal 50. As a result, a carrier wave having a phase as explained in FIG. 6 is obtained from the switch circuit 51. This carrier wave is then supplied to the multiplication circuit 42 and modulated by the horizontal detail component YI.

One embodiment of the additional information multiplex transmission apparatus has been described above in detail. Next, the additional information multiplex reception apparatus shown in FIG. 2 will be described.

In the figure, 61 is an input terminal to which an NTSC signal on which the horizontal detail signal Y is multiplexed is input. The signal input from this input terminal 61 is a motion adaptive three-dimensional Y/
The C separation circuit 62 separates the luminance signal Y11, signal C1, and motion detection signal MD.

The color signal C is color demodulated by the color demodulation circuit 63 in the same manner as a normal NTSC signal. This demodulated output is the color difference signal 1.
Q is supplied to output terminals 64.65.

The luminance signal Y is supplied to an adder circuit 66 and two-dimensional band pass filters (hereinafter referred to as 2D-BPF) 67 and 68. The 2D-BPF 67 has a pass band corresponding to the multiplex region H, and is used to extract the horizontal detail component YH multiplexed in the multiplex region H from the input signal. 2D-BPF6
8 has a pass band corresponding to the determination region I, and extracts the component of the determination region I from the input signal.

The extracted output of the 2D-BPF 67 is subjected to processing by a frequency shifter 69 that is opposite to the multiplex modulation processing on the transmitting side. As a result, if this extraction output includes a horizontal detail component Y
It becomes 1. The shift output of frequency shifter 69 is supplied to adder circuit 66 via switch circuit 70 .

The extracted output of the 2D-BPF 68 is supplied to a threshold value determination circuit 71. This threshold value determination circuit 71 determines whether or not there is a component greater than a predetermined threshold value in the input signal. The signal is supplied as a control signal to the switch circuit 70 via the switch circuit 72.Switch circuit 70
is turned off when a component equal to or higher than the threshold value exists in the determination region I, and turned on when there is no component. As a result, if there is no component equal to or higher than the threshold value in the determination region I, the shift output of the frequency shifter 69 is shifted to the switch circuit 70.
The signal is supplied to the adder circuit 66 via the adder circuit 66, and added to the luminance signal Y. If there is no component equal to or higher than the threshold value in the judgment region I, then the horizontal detail signal Y 1 is present in the multiplex region H.
1' is multiplexed. Therefore, in this case, the horizontal detail signal Y11 is added to the luminance signal Y.

As a result, a broadband luminance signal Y is obtained at the output terminal 73.

Note that the on/off control of the switch circuit 70 is performed only in the still image area. This is done by controlling on/off of the switch circuit 72 based on the motion detection signal MD. - From the above, the switch circuit 70 is turned on only when there is no component above the threshold value in the still image area and in the determination area I, and the horizontal detail signal Y11 is added to the luminance signal Y in the NTSC band.

FIG. 7 is a circuit diagram showing an example of a specific configuration of the frequency shifter 69.

Compared to the multiplex modulation circuit 21 shown in FIG. 5, the illustrated frequency shifter 69 uses an H-B P
Since they are the same except that 52 is inserted, their explanation will be omitted.

The above is the configuration of the additional information multiplex reception device according to one embodiment.

In such a configuration, when the reception S/N ratio decreases, the probability that a component equal to or higher than the threshold value exists in the determination region I increases, and the probability that the reproduction of the horizontal detail component Y11 is stopped increases. It gets expensive. However, the receiving S/N
If the ratio decreases, the horizontal detail component Y1. Since the effect of adding is also reduced, there are few practical problems. Rather, in such a configuration, when the reception S/N ratio decreases,
Furthermore, it operates preferably so that the reception S/N ratio does not decrease.

Note that whether or not to multiplex the horizontal detail component Y should basically be determined on a pixel by pixel basis, but it is possible to combine several pixels and make a determination for each pixel. Good too.

Although the transmitting device of FIG. 1 is not shown in the figure, it transmits a signal in which the horizontal detail components YII are multiplexed according to the algorithm described above, and a signal in which the horizontal detail components Y1 .
It has a function of multiplexing an identification signal for distinguishing it from a normal NTSC signal that is not multiplexed, for example, during a blanking period, and transmitting the multiplexed signal to the receiving side. Correspondingly, although not shown in the figure, even in the receiving apparatus shown in FIG. 2, if an identification signal indicating that the horizontal detail component Y11 is a non-multiplexed signal is obtained, the above-mentioned horizontal detail component The regeneration process of component Y II is stopped.

According to this embodiment described in detail above, the horizontal detail component YII can be multiplexed without reducing the utilization efficiency of the transmission path.

This is because it is determined whether or not there is a component equal to or greater than the threshold value in the determination area I, and only if there is no component, the horizontal detail component Y is multiplexed into the multiplication area (2). That is, instead of always removing part of the NTSC band, the horizontal detail component Y
'This is because I+ is multiplexed. Also, literature 1
．． Since the multiplexing area is a different area from the multiplexing area used in 2, the multiplexing area shown in Reference 1.2 can also be used for multiplexing information that occurs frequently, which improves the efficiency of transmission path usage. It can be said that it is possible to increase the

Further, according to this embodiment, the horizontal detail component YH can be multiplexed without reducing the reception S/N ratio.

This is because the horizontal detail component YH is not demodulated all the time, but is demodulated only when there is a component equal to or greater than the threshold value in the determination area I.

Furthermore, according to this embodiment, although the horizontal detail component Y II is multiplexed and reproduced only when a predetermined condition is met, the effect of improving the horizontal resolution due to the addition of the horizontal detail component Y 11 is not achieved. It can be fully achieved.

This is because the multiplexing and reproduction processing of the horizontal detail component Y)I is executed only when there is no component greater than a predetermined threshold value in the determination area I.

That is, the visibility for horizontal high-frequency components of 4 MHz or higher is significantly lower than the visibility for horizontal low-frequency components. Therefore, the horizontal detail component Y II
When multiplexing is performed only under predetermined conditions, the effect of improving horizontal resolution can be enhanced by multiplexing the horizontal detail component Y11 only in images that have many horizontal high-frequency components. By the way, in a picture pattern with many vertical high-frequency components, there are generally few visually significant horizontal high-frequency components, so even if the horizontal detail components Y are multiplexed, no improvement in horizontal resolution can be expected. Furthermore, if the signal has both a vertical high-frequency component and a horizontal component, the signal component becomes a diagonal high-frequency component, and the visual sensitivity decreases in terms of visual characteristics. Therefore, in this case, no effect of improving the horizontal resolution can be expected even if the horizontal detail component Y11 is multiplexed. Considering the above, the configuration in this embodiment determines whether or not a component greater than a predetermined threshold value exists in the determination region I, and multiplexes and reproduces the horizontal detail component Y11 only when it does not exist. According to the above, since the horizontal detail component Y□ is multiplexed and reproduced only in the case where the vertical component is small, or in other words, the horizontal detail component Y□ is multiplied and the horizontal detail component Y□ is multiplied. By doing so, the horizontal resolution can be improved and the effect can be fully realized.

Further, according to this embodiment, the horizontal detail component Y11
When playing, this horizontal detail component YH and the original NTS
Good separation from the C signal can be achieved.

This is because, if a component exceeding the threshold value exists in the multiplexed region (3) of the horizontal detail component YH, this component is removed before the horizontal detail component Y□ is multiplexed. It should be noted that even if the component of the multiple region (2) is removed in this way, there is almost no deterioration in image quality. This is because there is no component greater than the threshold value in the determination region I, and the probability that a component greater than the threshold value exists in the multiplex region H is extremely low.

FIG. 8 is a two-dimensional frequency domain diagram for explaining the second embodiment of the invention.

In the previous embodiment, the horizontal band of multiplex region ① is 2 to 4 MHz.
I explained the case where it is set to .

In contrast, in this embodiment, this horizontal band is set to 2 to 3 MHz, as shown in FIG. In addition, in accordance with this, the horizontal band of the horizontal detail component Y11 is also set to 4 to 5 MHz.

According to such a configuration, compatibility with two-dimensional Y/C separation can be maintained.

That is, in the previous embodiment, a case has been described in which the motion adaptive three-dimensional Y/C separation circuit 62 is used as the Y/C separation circuit on the receiving side. However, studio equipment using a large number of two-dimensional Y/C separation circuits is still used in broadcasting stations. In this two-dimensional Y/C separation circuit, what is regarded as the carrier color signal C is a component having a horizontal band of 3 to 4 MHz. Therefore, as in this embodiment, by shifting the multiplex region (2) from the horizontal band 3/4 MHz, the horizontal detail component Y. and the carrier color signal C can be separated.

FIG. 9 is a two-dimensional frequency domain diagram showing a third embodiment of the present invention.

In the previous two embodiments, the case where the vertical center frequency of the determination region 1 and the multiplex region 2 is set to 525/2 [cphl was explained.

On the other hand, in this embodiment, as shown in FIG. 8, this center frequency is set to 525/2 [cphl.

In order to realize such a configuration, frame inversion of carrier waves for multiplex modulation and multiplex demodulation may be switched to field inversion in the first embodiment. Further, the characteristics of each two-dimensional filter may be adjusted to those shown in FIG.

According to such a configuration, the determination area I and the multiplex area (2) are the first. Since the frequency is set higher than that in the second embodiment, the 2D-BEF 25 shown in FIG. Higher frequency components are removed from the second embodiment. Therefore, the reduction in image quality due to this removal is caused by the above-mentioned first problem. This is more suppressed than in the second embodiment.

Although three embodiments of the present invention have been described above in detail, the present invention is not limited to these embodiments.

For example, in the previous embodiment, a case has been described in which, when a component exceeding the threshold value exists in the multiplex region (2), the horizontal detail component YI+ is multiplexed after removing the component in the multiplex region (2). However, since there is no component greater than the threshold value in the determination region I, and the probability that a component greater than the threshold value exists in the multiple region H is low, there is no need to take a configuration that removes the component in the multiple region (2).

It goes without saying that the present invention can be modified in various other ways without departing from the spirit thereof.

[Effects of the Invention] As described above, according to the present invention, the multiplexing and reproduction processing of horizontal detail signals can be selectively performed only in the case where a visual effect can be obtained by multiplexing horizontal detail components. It will be done. Therefore, since the original transmission band is not always deleted, the utilization efficiency of the transmission path can be improved. Furthermore, since reproduction processing is not always performed on the receiving side, it is possible to prevent the S/N ratio from unnecessarily deteriorating.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing the configuration of an embodiment of the additional information multiplex transmission device of the present invention, FIG. 2 is a circuit diagram showing the configuration of an embodiment of the additional information multiplex reception device of the present invention, and FIG. Fourth
The figure is a diagram for explaining the operation of Figures 1 and 2, and Figure 5.
The figure is a circuit diagram showing an example of a specific configuration of the multi-m modulation circuit shown in FIG. 1, and FIG. 6 is a diagram for explaining the operation of FIG. 5.
FIG. 7 is a circuit diagram showing an example of a specific configuration of the frequency shifter shown in FIG. 2, FIG. 8 is a diagram for explaining a second embodiment of the present invention, and FIG. It is a figure for explaining an example. 11.2g, 29.61...input terminal, 12...H
-HPF, 13, 26.27.66...addition circuit, 1
4・V-HPF, 15・H-LPF, 16・H-BPF
, 17.18.71... Threshold determination circuit, 19.2
0.24, 70.72... switch circuit, 21...
Multiple modulation circuit, 22... Motion detection circuit, 23... Judgment circuit, 25... 2D-BEF, 30... Color modulation circuit, 31, 64, 65.73... Output terminal, 62...・
・Three-dimensional Y/C separation circuit, 63... Color demodulation circuit, 67
．． 68...2D-BPF, 69...Frequency shifter.

Claims (3)

[Claims] (1) In a wideband luminance signal having a horizontal transmission band expanded from the original horizontal transmission band, a predetermined signal located in the vertically high range of the above-mentioned original horizontal transmission band and located in the horizontally low range a determination area level determination means for determining whether or not a component of a predetermined level or higher exists in the determination area; A predetermined region located in the high range of An additional information multiplex transmission device comprising a multiplexing means for multiplexing components in a region exceeding the range. (2) a multiplex region level determining means for determining whether a component of a predetermined level or higher exists in the multiplex region; and a determination result that a component of a predetermined level or higher exists by the multiplex region level determining means; and component removal means for removing the components of the multiplexed region before multiplexing processing by the multiplexing means when the determination region level determining means determines that there is no component of a predetermined level or higher. The additional information multiplex transmission apparatus according to claim 1, characterized in that: (3) A device for receiving a wideband luminance signal having a horizontal transmission band expanded from the original horizontal transmission band, wherein the wideband luminance signal is located in a higher range in the vertical direction than the original horizontal transmission band. At the same time, a predetermined area located in a low band in the horizontal direction is a determination area, and a predetermined area located in a high band in a vertical direction and in a high band in a horizontal direction of the above-mentioned original horizontal transmission band is a multiplexing area. , in the additional information multiplex receiving device, which has a structure in which components in a region exceeding the original horizontal transmission band are multiplexed in the multiplexing region only when there is no component of a predetermined level or higher in the determination region, When the determination area level determining means determines whether a component of a predetermined level or higher exists in the determination area, and the determination area level determining means determines that a component of a predetermined level or higher does not exist, Additional information multiplex reception apparatus characterized by comprising a reproduction means for reproducing a wideband luminance signal having an original expanded horizontal transmission band by returning the components multiplexed in the multiplexed area to the original area. .