JP3014603U - Multiplex signal transmitter and multiplex signal receiver - Google Patents

Abstract

(57) [Abstract] [Purpose] To transmit an additional signal while eliminating interference of the additional signal with respect to the edge portion of the main signal, and to reproduce the additional signal accurately. A main signal corresponding to a vertical low frequency component of a wide band television signal is supplied to an input terminal 11, and an additional signal corresponding to a vertical high frequency component excluding the main signal is supplied to an input terminal 12. Supplied. The absolute value circuit 18 takes the absolute value of the main signal, and the adder circuit 20 obtains a non-zero control signal by adding a predetermined non-zero value to the absolute value circuit output. The division circuit 14 divides the additional signal by the control signal to obtain a post-control additional signal. The frequency multiplexing circuit 15 and the adding circuit 16 multiplex and output the main signal and the post-control additional signal.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to, for example, a multiplex signal transmission apparatus that frequency-multiplexes and transmits a high-definition television signal to a television signal that is compatible with the current system, and a multiplex signal reception apparatus that receives this multiplex signal. .

[0002]

[Prior art]

 In recent years, in television broadcasting, research and development relating to high definition of images have been actively conducted. In this high definition system, in order to achieve compatibility with the current system, the current system television signal is used as the main signal, and the high definition television signal is frequency-multiplexed as an additional signal. It has become. This frequency multiplexing method is described, for example, in "T. Hukinuki et." Extended Definition TV Fully Compatible with Existing Standards "IEEE TRANSACTIONS COMMUNICATION S, VOL.NO.8, AUGUST 1984" (hereinafter referred to as Reference 1). And the method described in "MAIsnardi et." Encoding for Compatibility and Recoverability in the ACTV System "IEEE TRANSACTIONS BROADCASTING VOL. BC-33 No. 4, DECEMBER 198 7" (hereinafter referred to as Reference 2). is there.

By the way, the additional signal for high definition does not contribute to image reproduction for the current television receiver and is treated as a noise signal with respect to the main signal. Therefore, the interference of the additional signal with respect to the main signal becomes a problem.

In order to eliminate this interference, the multiplexing level of the additional signal may be lowered. However, if the multiplexing level of the additional signal is lowered, the signal-to-noise ratio (hereinafter referred to as S / N ratio) is lowered, and the additional signal cannot be accurately reproduced on the receiving side.

Since the high-definition additional signal is a high-frequency signal, it is considered that this average power is considerably lower than the average power of the main signal in view of the general property of the television signal. Therefore, in this case, interference of the additional signal with respect to the main signal does not seem to be a problem. However, in reality, it causes an obstacle that the peak value of the main signal is increased at the edge portion of the image.

In order to solve this problem, in the above-mentioned Document 2, a method is used in which the additional signal is non-linearly compressed and transmitted on the transmitting side, and is non-linearly expanded and reproduced on the receiving side.

According to this method, it is considered that the interference of the additional signal with respect to the edge portion of the main signal can be reduced without lowering the S / N ratio of the additional signal. However, this method has the following two problems.

The first problem is that waveform distortion occurs in the reproduction output of the additional signal. That is, a harmonic component is generated in the nonlinear compression process. On the other hand, when an additional signal is frequency-multiplexed with the main signal for transmission, generally the transmission band of the additional signal is set to the same band as the spectrum band of the additional signal before compression in order to improve the utilization efficiency of the transmission band. To be done. Therefore, in this case, the harmonic component generated by the nonlinear compression processing on the transmitting side is not transmitted to the receiving side. As a result, waveform distortion occurs in the additional signal obtained by the non-linear expansion processing on the receiving side.

The other one is a problem that the deterioration of the image quality, which is very unnatural visually, is caused by the reduction of the resolution of the additional signal. That is, when digitally processing an additional signal transmitted as an analog signal on the receiving side, an 8-bit circuit is often used as the analog / digital conversion circuit. This is because using a 10-bit circuit significantly increases the cost of the circuit. The resolution of the 8-bit circuit is 256 gradations. However, only 10 to 20 gray levels can be secured as the resolution of the additional signal. This is because it is necessary to compress the peak value of the additional signal to 1/10 or less in order to eliminate the interference of the additional signal with respect to the main signal. Such a reduction in resolution not only causes an increase in quantization noise, but also a visually unnatural image. Especially, in the present example, the reduced resolution is further emphasized by the non-linear expansion processing on the receiving side, so that the unnaturalness of the image becomes noticeable.

[0010]

[Problems to be solved by the device]

 As described above, in the conventional device that frequency-multiplexes and transmits the additional signal for high definition, which has a correlation with the main signal, it is possible to eliminate the interference of the additional signal, There was a problem that could not be reproduced exactly.

Therefore, the present invention is capable of eliminating the interference of the additional signal, and is capable of obtaining stable and accurate reproduction processing of the additional signal when creating the additional signal for transmission and reproducing the additional signal on the receiving side. It is an object to provide a signal transmission device and a multiple signal reception device.

[0012]

[Means for Solving the Problems]

 The multiplex signal transmission device of the present invention is a device for transmitting a television signal of a screen in which an upper non-picture area is arranged above the main picture area and a lower non-picture area is arranged below the main picture area. Of the wideband television signal and the first input terminal to which a main signal constituting the main picture portion corresponding to the vertical direction low frequency component of the wideband television signal is supplied, and the main signal of the wideband television signal. A second input terminal corresponding to the removed high frequency component in the vertical direction and supplied with an additional signal which constitutes the upper and lower non-image parts; an absolute value circuit for taking an absolute value of the main signal; Addition means for obtaining a non-zero control signal by adding a predetermined non-zero value to the output of the value, and an additional signal from the second input terminal are input, and the additional signal is divided by the control signal. Means for obtaining post-additional signal, the main signal and the control post-additional signal The in which and means for outputting the multiplexed.

Further, the multiplex signal receiving apparatus of the present invention for receiving the multiplex signal transmitted as described above has a main signal corresponding to a vertical low frequency component of a wideband television signal and an absolute value of the main signal. The non-zero control signal obtained by adding the value and a predetermined non-zero value divides the additional signal corresponding to the vertical high frequency component of the wideband television signal excluding the main signal. An input terminal to which the post-control additional signal is multiplexed and input, a separating means for separating the main signal and the post-control additional signal from the multiplexed signal at the input terminal, and an absolute value of the separated main signal. An absolute value circuit that takes a value, an addition unit that obtains the control signal that is not zero by adding the predetermined value to the output of the absolute value circuit, and the separated control-added signal is multiplied by the control signal. Arithmetic And means for obtaining the additional signal.

[0014]

[Action]

 According to the above means, the level of the additional signal correlated with the main signal is controlled and transmitted so as to follow the level of the main signal in reverse, so that when the current receiver receives it, It does not stand out as a disturbance on the screen part of. When the additional signal is reproduced on the receiving side, it is controlled so as to follow the main signal in accordance with the level, and the original additional signal can be easily and surely reproduced. In particular, this means prevents the control signal from becoming zero, so that the additional signal after control is prevented from becoming infinite, and the reproduction additional signal is prevented from becoming zero.

[0015]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a circuit diagram showing the configuration of a first embodiment of a multiplex signal transmission device according to the present invention. FIG. 2 is a circuit diagram showing the configuration of the first embodiment of the multiplex signal receiving apparatus according to the present invention. It should be noted that FIGS. 1 and 2 do not include a chromaticity signal processing system.

First, the multiple signal transmission device of FIG. 1 will be described. In FIG. 1, 11 is an input terminal to which the main signal Y ₁ of the luminance signal Y is input. Further, 12 is a terminal to which the additional signal Y ₂ of the luminance signal Y is input. Here, the main signal Y ₁ and the additional signal Y ₂ have a correlation.

The main signal Y ₁ input from the input terminal 11 is supplied to the adder circuit 16 and frequency-multiplexed with the additional signal Y ₂ ′ obtained by the level control. This multiplexed signal is transmitted by a transmitter (not shown) connected to the output terminal 17.

The level control processing of the additional signal Y ₂ is performed as follows. That is, the additional signal Y ₂ input from the input terminal 12 is multiplied by A (constant value) by the level conversion circuit 13. This level conversion output is divided by the division circuit 14 using the control signal X obtained from the main signal Y ₁ as a divisor. The additional signal Y ₂ ′ obtained by this division is processed by the frequency multiplexing processing circuit 15 so as to be a signal suitable for frequency multiplexing. The additional signal Y ₂ ′ subjected to this conversion processing is frequency-multiplexed with the main signal Y ₁ in the adder circuit 16.

The control signal X is obtained as follows. That is, the main signal Y ₁ input from the input terminal 11 is first taken to have an absolute value by the absolute value circuit 18. The absolute value output is cumulatively added by the cumulative addition circuit 19 for each N (N is a positive integer of 2 or more) pixels. This cumulative addition output is added to a fixed value B determined in advance by the adder circuit 20. This added output is used as the control signal X described above. The fixed value B is a rational number.

The fixed value B prevents the division calculation power from becoming infinite when the cumulative addition output is 0, and is an important element in the transmission and reproduction processing of the additional signal. The control signal X thus obtained is represented by the following equation (1).

[0021]

[Equation 1]

Since the additional signal Y ₂ is divided by this control signal X, the additional signal Y ₂ ′ output from the division circuit 14 is expressed as follows. Y ₂ ′ = Y ₂ / X (2) Next, the multiplexed signal receiving apparatus shown in FIG. 2 will be described.

In FIG. 2, reference numeral 31 is an input terminal to which a multiplexed signal is input. The multiplexed signal inputted from the input terminal 3 1 is separated into the main signal Y ₁ and the additional signal Y ₂ 'by the frequency multiplexing processing circuit 32.

The main signal Y ₁ separated by the frequency multiplexing processing circuit 32 is supplied to an image processing unit (not shown) connected to the output terminal 33. On the other hand, the additional signal Y ₂ ′ is multiplied by the control circuit X obtained from the main signal Y ₁ by the multiplication circuit 34. This control signal X has a value as shown in the above equation (1) like the control signal X on the transmission side described above. Therefore, the additional signal Y ₂ is output from the multiplication circuit 34 as shown by the following equation (3).

Y ₂ = Y ₂ ′ · X (3) This additional signal Y ₂ is level-converted by the level conversion circuit 35. The level conversion circuit 35 has the opposite characteristic to the level conversion circuit 13 on the transmission side, and multiplies the input signal by 1 / A. This level-converted output is supplied to an image display unit (not shown) connected to the output terminal 36, and is used for image display together with the above-mentioned main signal Y ₁ .

The control signal X is generated by the absolute value circuit 37, the cumulative addition circuit 38, and the addition circuit 39, similarly to the transmission side. As described above, in this embodiment, the correlation between the main signal Y ₁ and the additional signal Y ₂ is used, and on the transmission side, the energy for N pixels of the main signal Y ₁ is obtained by cumulative addition of absolute values. The additional signal Y ₂ is divided by using the control signal X obtained on the basis of this as a divisor, and this division calculation power Y ₂ ′ is frequency-multiplexed with the main signal Y ₁ and transmitted. At the receiving side, cumulative addition of absolute values is performed. Thus, the energy of N pixels of the main signal Y ₁ is obtained, and the original additional signal Y ₂ is reproduced by multiplying the control signal X obtained based on this by the additional signal Y ₂ ′. It is a thing.

According to such a configuration, the main signal Y ₁ and the additional signal Y ₂ have a correlation, and thus the correlation between the control signal X and the additional signal Y ₂ is also guaranteed. Therefore, at the edge portion of the main signal Y ₁ where the level of the control signal X becomes large, the level of the additional signal Y ₂ is suppressed. As a result, it is possible to reduce the interference of the additional signal Y ₂ with respect to the main signal Y _{1 at} the edge portion of the main signal Y ₁ .

Further, the control signal X for shows the N pixels of the energy of the main signal Y _1, no broad spectrum, such as a main signal Y _1, with only the low-frequency component. Therefore, even by dividing the added signal Y ₂ a control signal X as the divisor, spectrum of the additional signal Y ₂ 'is almost the same as the spectrum of the original additional signal Y _2. Accordingly, it is possible to transmit all the additional signal Y ₂ 'after division by spectral band of the original additional signal Y _2, is not the waveform distortion in the reproduction output of the additional signal Y ₂ occurs.

Since the main signal Y ₁ is sent to the receiving side as it is, the receiving side can obtain almost the same control signal X 1 as the control signal X 1 on the transmitting side. Therefore, when reproducing the original additional signal Y ₂ on the receiving side, it can be reproduced accurately without lowering the resolution.

Further, since the control signal X is obtained by adding the fixed value B to the cumulative addition output of the main signal Y ₁ , the division result is infinite even if the cumulative addition output is 0. Can be prevented.

FIG. 3 is a circuit diagram showing a second embodiment of the multiplex signal transmission device according to the present invention. FIG. 4 is a circuit diagram showing the configuration of the second embodiment of the multiplex signal receiving apparatus according to the present invention.

In FIGS. 3 and 4, the same parts as those in the previous embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. In the above embodiment, the case where the absolute value of the main signal Y ₁ is cumulatively added in obtaining the control signal X has been described. On the other hand, in this embodiment, the square value of the main signal Y ₁ is cumulatively added. That is, in FIGS. 3 and 4, the absolute value circuits 18 and 37 of FIGS. 1 and 2 are replaced by the square value circuits 21 and 41, respectively.

With such a configuration, the energy of N pixels of the main signal Y ₁ can be obtained as in the previous embodiment. FIG. 5 is a circuit diagram showing the configuration of a third embodiment of the multiplex signal transmission device according to the present invention. FIG. 6 is a circuit diagram showing the configuration of the third embodiment of the multiplex signal receiving apparatus according to the present invention.

In this embodiment, a case where the present invention is applied to a multiplex signal transmission device and a multiplex signal reception device of a system for transmitting a vertical definition signal as an additional signal Y ₂ is shown.

As a system for transmitting the vertical definition signal as the additional signal Y ₂ , there is, for example, a wide aspect system intended to display a screen having a larger aspect ratio than the current system.

Here, an example of the wide aspect method in consideration of compatibility with the current method will be described with reference to FIGS. 7 and 8. FIG. 7 shows a screen format when a wide aspect system television signal is received by a current NTSC type television receiver, and FIG. 8 shows a screen format when it is received by a wide aspect type television receiver. Indicates the screen format.

In FIG. 7, reference numeral 151 is an NTSC screen, 152 is a wide aspect screen, and 153 and 154 are screens of constant brightness, for example. As shown in the figure, the wide aspect screen 152 (main image portion) is set to be vertically compressed and fit within the NTSC screen 151. Then, the NTSC screen 151 is formed by adding screens 153 and 154 (upper and lower constant brightness portions) above and below the wide aspect screen 152.

When such a television signal is received by the wide aspect television receiver, the wide aspect screen 152 is expanded in the vertical direction to display the screen of the television receiver as shown in FIG. The wide aspect screen 152 is displayed on the entire display area.

When the vertical resolution of the television receiver is 480, when the wide-spectrum television signal is received by the NTSC television receiver, the vertical resolution of the wide aspect screen 152 is 360. Thus, when received by a wide-spectrum television receiver, the number is 480.

In the configuration as described above, the vertical definition signal of each line, that is, the additional signal Y ₂ is a portion (upper and lower constant luminance portion) corresponding to the screens 153, 154 (for 120 lines). Is frequency multiplexed. In this case, the additional signal Y ₂ is 525/4 [c. p. In the NTSC television receiver, the interference due to the additional signal Y ₂ appears considerably in the portions of the screens 153 and 154 (the upper and lower constant luminance portions) because the component [h] is included.

This embodiment provides a device capable of eliminating the interference of the additional signal Y _{2 in} the screens 153 and 154 (upper and lower constant luminance portions) and reproducing the additional signal Y ₂ accurately. is there.

First, the multiple signal transmission device of FIG. 5 will be described. In FIG. 5, only the luminance signal processing system is shown, and the chromaticity signal processing system is omitted. In FIG. 5, reference numeral 161 is an input terminal to which a luminance signal Y of a wide aspect television signal is input. The brightness signal Y is, for example, an interlace signal.

The luminance signal Y input from the input terminal 161 is separated into a low frequency component and a high frequency component in the vertical direction by the LPF 162 and the subtraction circuit 163 in the vertical direction. The low frequency component output from the LPF 162 is (3 × 525) / 8 [c. p. h] vertical band and is treated as the main signal Y ₁ . On the other hand, the high frequency component output from the subtraction circuit 163 is 525/8 [c. p. h], and is treated as an additional signal Y ₂ for high definition.

As shown in FIG. 11, the LPF 162 is within a field composed of 1H delay circuits 181, 182, 183, 184, 185, adder circuits 186, 187, coefficient circuits 188, 189, 190, and adder circuit 191. LPF.

The main signal Y ₁ is set by the time compression circuit 164 so that it is multiplied by 3/4 in the vertical direction and is contained within the NTSC screen 151, as shown in FIG. The time compression circuit 164 is composed of an interpolation filter as shown in FIG.

In this interpolation filter, the main signal Y ₁ input from the input terminal 201 is delayed by the field memory 202, 1H delay circuits 203, 204 and 205, and each tap output is delayed by the coefficient circuits 206, 207, 208 and 209. A coefficient is multiplied and these are added by an adder circuit 210 and output from an output terminal 211. In this case, the coefficients of the coefficient circuits 206, 207, 208 and 209 are set to be 1 in total. Also, since this coefficient differs depending on the line formed, it can be switched for each line. As a result, the time-compressed main signal Y ₁ is obtained from the output terminal 211.

The time compression circuit 164 adds a signal of constant brightness to the main signal Y ₁ thus obtained at the portions (upper and lower constant brightness portions) corresponding to the screens 153 and 154, and adds this to the main signal Y 1. Output as ₀ . FIG. 14 shows a state of time compression. By this time compression, the vertical band of the main signal Y ₁ is 0 to 525/2 [c. p. h].

The main signal Y ₀ to which the constant luminance signal is added in this way is frequency-multiplexed with the additional signal Y ₂ ′ by the adding circuit 165 in the upper and lower constant luminance portions. This multiplexed signal is transmitted by a transmitter (not shown) connected to the output terminal 166.

The additional signal Y ₂ is thinned by the line thinning circuit 167. Considering the first field F ₁ and the second field F ₂ together, this line thinning is performed so as to extract a signal for one line in four lines, as shown in FIG. However, in practice, the signals of the first field F ₁ are thinned out every other line, and the signals of the second field F ₂ are all thinned out.

The additional signal Y ₂ output from the line thinning circuit 167 is multiplied by A by the level conversion circuit 168. This A-fold output is divided by the division circuit 169 using the control signal X obtained from the main signal Y ₁ as a divisor. The additional signal Y ₂ ′ obtained by this division is subjected to delay processing by the multiplexing processing circuit 170 so as to be multiplexed in the shaded area of FIG. To receive. The additional signal Y ₂ ′ subjected to this delay processing is multiplexed by the adder circuit 165 with the upper and lower constant luminance parts of the main signal Y ₀ . As a result, a multiplexed signal as shown in FIG. 12 (b) is obtained.

The control signal X is generated as follows. That is, the main signal Y ₀ output from the time compression circuit 164 is thinned by the line thinning circuit 171. This line thinning is performed by extracting signals for one line in three lines in the vertical direction.

The output of the line thinning circuit 171 is subjected to an absolute value by an absolute value circuit 172, and then cumulatively added by a cumulative addition circuit 173 every N pixels. This cumulative addition output is added to the fixed value B by the addition circuit 174 and supplied to the division circuit 169 as the control signal X. As a result, the additional signal Y ₂ ′ represented by the above equation (2) is obtained from the division circuit 169.

Next, the multiplex signal receiving apparatus of FIG. 6 will be described. Also in FIG. 6, the processing system of the chromaticity signal is omitted. In FIG. 6, reference numeral 221 is an input terminal to which the received multiplexed signal is input. The multiplexed signal input from the input terminal 221 is time-expanded to 4/3 times with the main signal Y ₁ extracted by the time expansion circuit 222. Thereby, the vertical band of the main signal Y ₁ is 0 to (3 × 525) / 8 [c. p. h].

The main signal Y ₁ output from the time expansion circuit 222 is frequency-multiplexed with the reproduction-added signal Y ₂ by the addition circuit 223. As a result, the brightness signal Y including the vertical definition component is obtained. The luminance signal Y is provided for image display by an image display unit (not shown) connected to the output terminal 224.

The additional signal Y ₂ is reproduced as follows. That is, the multiplexed signal input from the input terminal 221 is supplied to the additional signal separation circuit 225. The additional signal separation circuit 225 separates the additional signal Y ₂ ′ multiplexed at the positions of the screens 153 and 154 (upper and lower constant luminance portions) from the input signal. The additional signal Y ₂ ′ is subjected to delay adjustment by the delay adjustment circuit 226 and then supplied to the multiplication circuit 227. Here, the delay adjusting circuit 226 is a circuit for extending the time axis of the additional signal Y ₂ ′ of each line and changing it to the time axis of the line extracted at the time of transmission, as shown in FIG. is there. In this case, the delay adjustment circuit 226 does not go back in time to perform the time adjustment, and in fact, by providing a field delay circuit in the line thinning circuit 230 described later, all the signals are delayed by one field. It is supposed to process.

The additional signal Y ₂ ′ thus delay-adjusted is multiplied by the multiplication circuit 227 using the control signal X obtained from the main signal Y ₁ as a multiplier. As a result, the additional signal Y ₂ is reproduced.

The reproduced additional signal Y ₂ is multiplied by 1 / A by the level conversion circuit 228 having a characteristic opposite to that on the transmitting side. This 1 / A times output has a vertical band of 525/8 [c. p. h], and then in the adder circuit 223: vertical band (3 × 525) / 8 [c. p. h] is frequency-multiplexed with the main signal Y ₁ .

The control signal X is generated by the line thinning circuit 230, the absolute value circuit 231, the cumulative addition circuit 232, and the addition circuit 233 as in the transmission side. Although the this invention has been described an embodiment when applied to equipment of wide aspect system for transmitting high-definition component in the vertical direction, even in this case, with respect to the upper under constant luminance portion of the main signal Y ₀ it is a matter of course that it is possible to correct playback of reducing interference of the additional signals Y ₂ and the additional signal Y _2.

The present invention is not limited to the above embodiment. For example, in the above embodiment, the case where the absolute value or the squared value of the main signal is cumulatively added to detect the energy of the main signal has been described, but it goes without saying that a configuration other than this may be used. .

Further, in the above embodiment, in order to limit the level of the additional signal, the transmitting side performs the division processing of the additional signal, and the receiving side performs the multiplication processing, but the transmitting side and the receiving side have been described. If the reverse control is performed in, the control other than this may be performed. In addition to this, it is needless to say that the present invention can be variously modified and implemented without departing from the scope of the invention.

[0061]

[Effect of device]

 As described above, according to the present invention, the interference of the additional signal can be eliminated, and stable and accurate reproduction processing of the additional signal can be performed at the time of creating the additional signal for transmission and reproducing the additional signal at the receiving side. can get.

[Brief description of drawings]

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

FIG. 2 is a circuit diagram showing the configuration of the first embodiment of the receiving device.

FIG. 3 is a circuit diagram showing a configuration of a second embodiment of the transmission device of the same.

FIG. 4 is a circuit diagram showing a configuration of a second embodiment of the receiving device.

FIG. 5 is a circuit diagram showing a configuration of a third embodiment of a transmission device according to the present invention.

FIG. 6 is a circuit diagram showing the configuration of a third embodiment of the receiving device.

FIG. 7 is an explanatory diagram of a wide screen and an NTSC screen.

FIG. 8 is an explanatory diagram of a wide screen.

FIG. 9 is an explanatory view showing a signal transmission spectrum of the device according to the present invention.

FIG. 10 is an explanatory view showing a signal transmission spectrum of the same device.

11 is a diagram showing a configuration example of the low-pass filter shown in FIG.

FIG. 12 is an explanatory diagram showing a compression conversion example of a wide screen.

FIG. 13 is a diagram showing an example of a time compression circuit.

FIG. 14 is an explanatory diagram of arrangement of time-compressed signals.

FIG. 15 is a diagram for explaining processing of an additional signal in a line thinning circuit.

FIG. 16 is a diagram shown for explaining a time-axis expansion process of an additional signal.

[Explanation of symbols]

11, 21, 31 ... Input terminals, 13, 35 ... Level conversion circuit, 14 ... Division circuit, 15, 32 ... Frequency multiplexing processing circuit, 16, 20, 39 ... Addition circuit, 17, 33, 36 ...
Output terminals, 18, 37 ... Absolute value circuit, 19, 38 ... Cumulative addition circuit, 34 ... Division circuit.

Claims (5)

[Scope of utility model registration request] 1. A device for transmitting a television signal of a screen in which an upper non-picture portion is arranged above the main picture portion and a lower non-picture portion area is arranged below the main picture portion, which is a device for transmitting a wide band television signal. A first input terminal corresponding to a low frequency component in the vertical direction and supplied with a main signal forming the main image section; and a high frequency component in the vertical direction excluding the main signal from the broadband television signal. A second input terminal to which an additional signal constituting the upper and lower non-image parts is supplied, an absolute value circuit for taking an absolute value of the main signal, and a predetermined non-zero value for outputting the absolute value. Adding means for obtaining a non-zero control signal by adding the input signal, means for receiving the additional signal from the second input terminal, and obtaining the post-control additional signal by dividing the additional signal by the control signal; The signal and the additional signal after the control are multiplexed and output. Multiplex signal transmitting apparatus characterized by comprising a stage. 2. An apparatus for transmitting a television signal of a screen in which an upper non-picture portion is arranged above the main picture portion and a lower non-picture portion area is arranged below the main picture portion, which is a device for transmitting a wide band television signal. A first input terminal corresponding to a low frequency component in the vertical direction and supplied with a main signal forming the main image section; and a high frequency component in the vertical direction excluding the main signal from the broadband television signal. A second input terminal to which an additional signal that composes the upper and lower non-image parts is supplied, an absolute value circuit that takes an absolute value of the main signal, and an output of the absolute value for cumulative addition of a plurality of pixels. A cumulative addition circuit for obtaining a control signal that is not zero by adding a predetermined non-zero value to the output of the cumulative addition circuit; and an additional signal from the second input terminal Is divided by the control signal That means a multiplex signal transmission apparatus characterized by comprising a means for outputting the multiplexed and said main signal and said control after the addition signal. 3. An apparatus for receiving a television signal of a screen in which an upper non-picture portion is arranged above the main picture portion and a lower non-picture portion area is arranged below the main picture portion, which is a device for receiving a wide band television signal. Of which, the main signal corresponding to the vertical direction low frequency component and transmitted as the main image section,
A non-zero control signal obtained by adding the absolute value of the main signal and a predetermined value other than zero corresponds to the vertical high frequency component of the wideband television signal excluding the main signal. An input terminal into which the additional signal is divided and is input in a multiplexed state with the post-control additional signal transmitted as the upper and lower non-image parts, and the main signal and the post-control additional signal from the multiplex signal of the input terminal Separating means for separating the separated main signal, an absolute value circuit for taking the absolute value of the separated main signal, and an adding means for obtaining the control signal which is not zero by adding the predetermined value to the output of the absolute value circuit. A means for obtaining the additional signal by multiplying the separated additional signal after control by the control signal, and a synthesizing means for synthesizing the additional signal and the separated main signal. Many Signal receiving apparatus. 4. An apparatus for receiving a television signal of a screen in which an upper non-picture portion is arranged above the main picture portion and a lower non-picture portion area is arranged below the main picture portion, which is a device for receiving a wide band television signal. Of which, the main signal corresponding to the vertical direction low frequency component and transmitted as the main image section,
The non-zero control signal obtained by adding the absolute value of the main signal and a predetermined value other than zero corresponds to the vertical high frequency component of the wideband television signal excluding the main signal. An input terminal into which the additional signal is divided and is input in a multiplexed state with the post-control additional signal transmitted as the upper and lower non-image parts, and the main signal and the post-control additional signal from the multiplex signal of the input terminal A separation means for separating the separated main signal, an absolute value circuit for taking the absolute value of the separated main signal, a cumulative addition means for cumulatively adding a plurality of pixels of the output of the absolute value circuit, and an output of the cumulative addition means Adding means for obtaining the non-zero control signal by adding the predetermined value; means for multiplying the separated post-control additional signal by the control signal to obtain the additional signal; and separating the additional signal. Multiplex signal receiving apparatus characterized by comprising a synthesizing means for synthesizing said main signal. 5. The multiplex signal receiving apparatus according to claim 3, further comprising display means for displaying the output of the synthesizing means.