JP4918348B2 - Display device - Google Patents

Description

  The present invention relates to a display device that displays a reception level obtained based on a signal received by a receiver and an actual reception limit level, and more particularly, to a display device that performs a display that is easy for a person to visually grasp.

For example, when an analog modulation method is used in a radio transmission apparatus of a broadcasting system that transmits video and audio, the signal-to-noise ratio (S / N ratio) deteriorates as the reception level decreases in the receiving apparatus. However, the quality of the demodulated video and audio is reduced in proportion to the S / N ratio.
On the other hand, in recent years, in a wireless transmission apparatus of a broadcasting system for transmitting video and audio, a QPSK (Quadrature Phase Shift Keying) method, a QAM (Quadrature Amplitude Modulation) method, an OFDM (Orthogonal Frequency Division Digital Modulation Division Modulation Division Modulation Division Modulation Diving Modulation Modulation Diving Modulation Modulation Modulation Modulation Modulation Modulation Modulation Modulation Modulation Modulation Modulation Modulation Modulation Modulation Modulation Modulation Modulation Modulation Modulation Modulation Modulation Modulation Modulation Modulation Modulation Modulation Modulation Modulation It is practiced to use a method. When the digital modulation method is used, even if the reception level decreases to a certain level, an error correction technique is used to correct an error that has occurred on the transmission path, and the signal before transmission (original signal). ) Is possible to restore completely.

JP 2004-146975 A

However, when the digital modulation method is used in the wireless transmission device, when the reception level is below the error correction limit, it is suddenly impossible to demodulate, and video and audio are interrupted. It was.
In order to avoid such a situation, for example, in a display device for monitoring transmission quality, operation parameters of the wireless transmission device such as a reception level, a bit error rate obtained from an error correction result, or a modulation method, etc. By displaying, it is conceivable to perform wireless transmission while monitoring the state of the transmission path and the state of the wireless transmission device by an operator (person).

  However, when the operator monitors information indicating the reception level, bit error rate, modulation method, etc., it is possible to grasp the current transmission state, but it is a feature of the digital modulation method using error correction technology. The information for dealing with the problem that the demodulated signal collapses suddenly was extremely insufficient. For example, in order to grasp the margin (margin) to the actual reception limit level, the operator needs to make a judgment based on a certain degree of experience value, and could not be grasped easily. .

  The present invention has been made in view of such a conventional situation, and in a manner in which it is easy for a person to visually grasp a reception level obtained based on a signal received by a receiver and an actual reception limit level. An object of the present invention is to provide a display device capable of displaying. The present invention aims to visually facilitate, for example, grasping the margin to the actual reception limit level by a person.

In order to achieve the above object, the display device according to the present invention displays graphic information representing the reception status of digital communication with the following configuration.
That is, the first acquisition unit acquires information specifying the reception level. The second acquisition means acquires information for specifying the actual reception limit level. The display control means is specified by the information acquired by the first acquisition means so as to indicate the margin of the reception level by the display arrangement relationship between the graphic information indicating the reception level and the graphic information indicating the actual reception limit level. The graphic information representing the received reception level and the graphic information representing the actual reception limit level specified by the information acquired by the second acquisition means are displayed.

  Therefore, since the reception level and the actual reception limit level are displayed by the graphic information, for example, the reception level obtained based on the signal received by the receiver and the actual reception limit level are visually grasped by the person. It can be displayed in an easy manner. In addition, when the reception level and the actual reception limit level are displayed on the same screen as the graphic information, the margin of the reception level is determined by the display arrangement relationship between the graphic information indicating the reception level and the graphic information indicating the actual reception limit level. Therefore, for example, it is possible to visually facilitate the grasp of the margin to the actual reception limit level by a person.

Here, the digital communication may be applied to various communications.
Various pieces of graphic information may be used. For example, straight lines, curved lines, marks having various shapes such as triangles, squares, and circles, indicators using bars, and the like can be used.
Further, for example, a configuration that displays numerical information together with diagram information may be used.

In addition, as the information for specifying the reception level, for example, information on the reception level itself may be acquired, or the reception level is specified by calculation or association stored in advance, although it is not information on the reception level itself. Information that can be acquired may be acquired.
Similarly, as the information specifying the actual reception limit level, for example, information on the actual reception limit level itself may be acquired, or it is not information on the actual reception limit level itself, but is calculated or stored in advance. Information that can specify the actual reception limit level may be acquired based on the association made.
Moreover, as acquisition of information, the aspect acquired by detecting the information by the function which detects the information may be used, for example, or the information is input from the outside by the function which inputs the information from the outside. The aspect acquired by inputting may be used.

The margin of the reception level with respect to the actual reception limit level corresponds to the difference between the reception level and the actual reception limit level.
In addition, various aspects may be used as an aspect representing the margin of the reception level by the display arrangement relationship between the graphic information representing the reception level and the graphic information representing the actual reception limit level. As an example, the reception level It is possible to use a mode in which the distance between the position on the display corresponding to and the position on the display corresponding to the actual reception limit level is proportional to the margin.

The display device according to the present invention has the following configuration as a configuration example.
That is, at least one of the case where the specified actual reception limit level is different from the true value (true value) and the case where the specified actual reception limit level is outside the displayable range There are cases.
In such a case, the display control unit displays the graphic information indicating the actual reception limit level specified by the information acquired by the second acquisition unit in a manner different from other cases. .

Therefore, when there is a difference from the true value with respect to the specified actual reception limit level, the graphic information indicating the actual reception limit level is displayed in a different manner from the other cases, so that the specified It can be visually recognized by a person that there is a difference between the actual reception limit level and the true value.
In addition, when the specified actual reception limit level is out of the displayable range, the graphic information indicating the actual reception limit level is displayed in a different manner from the other cases. It is possible for a person to visually grasp that the reception limit level is out of the displayable range.

  In the configuration in which there is a case where there is a difference from a true value with respect to the specified actual reception limit level and a case where the specified actual reception limit level is outside the displayable range, For example, the graphic information indicating the actual reception limit level may be the same in both cases, or the graphic information indicating the actual reception limit level may be different in both cases. It may be allowed.

Here, as the case where there is a difference from the true value with respect to the specified actual reception limit level, for example, there is a numerical range limitation on the information specifying the actual reception limit level, and the true reception limit level is true. In all cases where the value is equal to or less than a predetermined threshold (predetermined lower limit), the actual reception limit level may be specified as the threshold (the lower limit).
Further, as the case where the specified actual reception limit level is out of the displayable range, for example, the displayable range has a predetermined upper limit value or a predetermined lower limit value, and a value exceeding the upper limit value. Or a value less than the lower limit value may not be displayed.

  Further, in such a predetermined case, various ways may be used to display the graphic information indicating the actual reception limit level in a manner different from other cases, for example, with the same mark. However, it is possible to use a method of changing the display direction, size, color, or the like, or a method of displaying different marks. As an example, if the actual value of the reception limit level is different from the display position using a mark such as a triangle or arrow that can visually grasp the direction, mark the direction of the true value. If the actual reception limit level exceeds the upper limit of the displayable range, the direction of the mark to indicate the direction beyond the upper limit, or the actual reception limit level When it is less than the lower limit value of the displayable range, a method of arranging the direction of the mark so as to indicate the direction less than the lower limit value can be used.

The display device according to the present invention has the following configuration as a configuration example.
That is, the third acquisition unit acquires information for specifying a theoretical reception limit level.
Then, the display control means displays graphic information indicating the theoretical reception limit level specified by the information acquired by the third acquisition means.

  Therefore, since the actual reception limit level and the theoretical reception limit level are displayed by the graphic information, for example, it is possible to easily grasp the difference between them. Also, for example, when the actual reception limit level and the theoretical reception limit level are displayed on the same screen as the graphic information, the graphic information indicating the actual reception limit level and the graphic information indicating the theoretical reception limit level By representing these differences by the display arrangement relationship, it is possible to visually facilitate the grasp of the difference between the actual reception limit level and the theoretical reception limit level by a person.

Here, as the information for specifying the theoretical reception limit level, for example, information on the theoretical reception limit level itself may be acquired, or although it is not information on the theoretical reception limit level itself, it may be calculated. Alternatively, information that can specify a theoretical reception limit level may be acquired by association stored in advance.
In addition, various aspects may be used as an aspect representing the difference between the display information of the graphic information representing the actual reception limit level and the graphic information representing the theoretical reception limit level, and as an example, It is possible to use a mode in which the distance between the display position corresponding to the actual reception limit level and the display position corresponding to the theoretical reception limit level is proportional to these differences.

As described above, according to the display device of the present invention, as the reception status of digital communication, the reception level and the actual reception limit level are displayed as graphic information, and the reception level margin is determined by the display positional relationship of these graphic information. Since the degree is expressed, it is possible for the person to visually recognize the margin of the reception level visually, and it is possible to facilitate visual monitoring by the person.
Further, according to the display device of the present invention, when the display position of the actual reception limit level is different from the true value, the display mode of the figure information is set to the normal case (for example, the display of the actual reception limit level). Since the display position of the actual reception limit level is different from the true value, it can be easily visually recognized by a person.
In addition, according to the display device of the present invention, the actual reception limit level and the theoretical reception limit level are displayed simultaneously by the graphic information, so that the difference between them can be easily grasped visually by a person.

Embodiments according to the present invention will be described with reference to the drawings.
1A and 1B show a configuration example of a wireless system provided with a display device according to an embodiment of the present invention.
FIG. 1A illustrates a configuration example of a transmission device as a configuration example on the transmission side.
The transmission apparatus of this example includes a compressor 1, a transmitter 2 that processes baseband signals, a transmitter 3 that processes high-frequency signals, and an antenna 4. Here, the transmitter 2 corresponds to a transmitter C (Controller), the transmitter 3 corresponds to a transmitter H (Head), and an intermediate frequency signal (IF signal) or a baseband signal from the transmitter 2 to the transmitter 3. Is transmitted.

FIG. 1B shows a configuration example of a receiving device and a configuration example of a display device connected to the receiving device as a configuration example on the receiving side.
The receiving apparatus of this example includes an antenna 11, a receiver 12 that processes a high-frequency signal, a receiver 13 that processes a baseband signal, and a decompressor 14. Here, the receiver 12 corresponds to the receiver H (Head), the receiver 13 corresponds to the receiver C (Controller), and an intermediate frequency signal (IF signal) or a baseband signal from the receiver 12 to the receiver 13. Is transmitted.
The display device of this example includes a display signal generation device 21 and a monitor 22, and is connected to the receiver 13 of the reception device.

The wireless system of this example is used in a broadcasting system, and the transmission device and the reception device are each configured as an FPU (Field Pick-up Unit) device.
For example, the transmission device is provided in a relay vehicle or the like equipped with a camera or a microphone, and transmits a video captured by the camera or a voice collected by the microphone as a wireless signal at a television relay site (transmission point). . The receiving device is provided in the broadcast station and receives video and audio wirelessly transmitted from the transmitting device. The broadcasting station selects and edits video and audio received from a plurality of transmission devices, edits them, and wirelessly transmits the edited video and audio as broadcast signals to the television apparatus.

An example of the operation performed by the transmission apparatus of this example is shown.
A video or audio signal as a material signal is input to the compressor 1.
The compressor 1 compresses the input video and audio signals and outputs the compressed video and audio signals to the transmitter 2. By such compression, the data amount of the material signal can be reduced, and the load on wireless transmission can be reduced.
In this example, the configuration in which the compressor 1 is connected to the front stage of the transmitter 2 is shown. However, as another configuration example, the function of the compressor 1 can be incorporated in the transmitter 2.

The transmitter 2 performs interleaving, error correction coding, and the like on the compressed video and audio signals input from the compressor 1, and modulates the signals using a digital modulation method such as a QPSK method, a QAM method, or an OFDM method. After application, the resulting signal is output to the transmitter 3. It should be noted that a plurality of modulation schemes such as the QPSK scheme, the 16QAM scheme, the 32QAM scheme, the 64QAM scheme, and the OFDM scheme can be switched and used according to the communication status.
The transmitter 3 converts the signal input from the transmitter 2 into, for example, a microwave band signal that can be transmitted over a long distance, and transmits the signal wirelessly from the antenna 4.
The wireless signal transmitted in this manner is adversely affected by fading and the like in the transmission path (in this example, a wireless line) due to reflection by an obstacle, air, temperature, and the like.

  In addition, the transmission device wirelessly transmits information (TMCC information) referred to when performing demodulation to the reception device. In this example, TMCC information used by the transmitter as interleave depth information indicating how long the reordering is performed, error correction method information, and digital modulation method information is used. Is included. Also, the TMCC information is generated by the transmitter 2, multiplexed with video and audio signals, and wirelessly transmitted via the transmitter 3 and the antenna 4, for example.

An example of the operation performed by the receiving apparatus of this example will be shown.
A radio signal wirelessly transmitted from the transmission device is received by the antenna 11 and input to the receiver 12.
The receiver 12 converts the frequency of the received signal input from the antenna 11 into an intermediate frequency signal or a baseband signal and outputs the converted signal to the receiver 13.
The receiver 13 digitally demodulates the signal (digital modulation signal) input from the receiver 12 using a method corresponding to the transmission side, and then performs error correction decoding using a method corresponding to the transmission side, or supports the transmission side. Deinterleaving is performed by the above method, and the resulting signal is output to the decompressor 14. In this case, the receiver 13 extracts the TMCC information included in the received signal, does not output it to the decompressor 14, and outputs only the compressed video and audio signals to the decompressor 14. .
If the transmission path condition allows error correction using the error correction technique used, it is possible to correct the bit error generated in the transmission path for the received signal and restore the data before transmission (original data).

The decompressor 14 decompresses the signal (compressed video and audio data) input from the receiver 13 and restores the original video and audio signal (original material signal). Thereby, the image | video and audio | voice sent from the transmission point can be obtained.
In this example, the configuration in which the expander 14 is connected to the subsequent stage of the receiver 13 is shown. However, as another configuration example, the function of the expander 14 can be incorporated in the receiver 13.

Here, the receiver 13 is connected to the display signal generation device 21 of the display device, and the reception level, margin, digital modulation method, error correction method, and interleaving depth are supplied to the display signal generation device 21. A signal indicating each of the above is output.
The receiver 13 detects the reception level as the received electric field intensity or the like based on the received signal.
Further, the receiver 13 calculates, for example, the S / N ratio of the demodulation result of the received signal, detects the bit error rate (BER) of the received signal, and multipath of the received signal. Detects the situation (the situation of the reflected wave), and based on one or more of the reception level, S / N ratio, BER, multipath situation, and the digital modulation method used Thus, the margin of the reception level up to the error correction limit in the actual transmission path is calculated with respect to the current reception level. As an example, the receiver 13 can calculate the margin based on the S / N ratio and the digital modulation scheme.
Further, the receiver 13 acquires a digital modulation scheme, an error correction scheme, and an interleaving depth based on the TMCC information received from the transmission apparatus.

  In communication from the receiver 13 to the display signal generation device 21, for example, a display signal indicating a reception level, a margin, a digital modulation scheme, an error correction scheme, and an interleaving depth is communicated. In the case where the material signal is output from the receiver 13 to the display signal generation device 21 through the TS (Transport Stream) of the main line, the connection section or the connection line may be provided exclusively. It is also possible to use the carrier as a carrier and output a display signal on the null portion included in the TS.

An example of the operation performed by the display device of this example is shown.
The display signal generation device 21 acquires the reception level, margin, digital modulation method, error correction method, and interleaving depth from the display signal input from the receiver 13. Then, the display signal generation device 21 generates a signal for displaying the reception level (for example, the reception level meter 62 shown in FIG. 3 ) based on the acquired reception level, and the actual signal is displayed based on the acquired margin. A signal for displaying a reception limit level (for example, the reception limit cursor 63 shown in FIG. 3 ) is generated, and a theoretical reception limit level (based on the acquired digital modulation method, error correction method, and interleaving depth) is generated. For example, a signal for displaying the reception limit line 64) shown in FIG. 3 is generated. Further, the display signal generation device 21 generates a signal for displaying a scale of the reception level (for example, the reception level marker 61 shown in FIG. 3 ). The display signal generation device 21 outputs these generated signals to the monitor 22.
The monitor 22 displays information indicated by the signal on the screen based on the signal input from the display signal generation device 21.

Here, the actual reception limit level is a reception limit level obtained based on the result of communication using an actual transmission path with noise. In the actual transmission path, the reception level is the actual reception limit. If it is above the level (for example, unit of dBm), it indicates that it can be demodulated. Note that the actual reception limit level has a poor convergence of the digital value as a demodulation result due to a decrease in the S / N ratio due to, for example, a decrease in the reception level (for example, it should originally be a value of 4). When a value such as 4.5 is acquired and the error is large), it becomes high.
Also, the theoretical reception limit level is the reception limit level that is required when assuming an ideal transmission line that is clear and free of noise. In the ideal transmission line, the reception level is the theoretical reception limit. If it is above the level (for example, unit of dBm), it indicates that it can be demodulated.
The actual reception limit level is higher than the theoretical reception limit level.

FIG. 2 shows a configuration example of the display signal generation device 21 of this example.
The display signal generation device 21 of this example includes a difference calculation unit 31, a reception limit level determination unit 32, a first comparator 33, a second comparator 34, a third comparator 35, and a counter 36. A first display controller 37, a second display controller 38, a third display controller 39, a fourth display controller 40, and an adder 41.

An example of the operation performed by the display signal generation device 21 of this example is shown.
With the signal input from the receiver 13, reception level information is input to the difference calculation unit 31 and the first comparator 33, margin information is input to the difference calculation unit 31, and information on digital modulation schemes and errors Information on the correction method and information on the depth of interleaving are input to the reception limit level determination unit 32.
The difference calculation unit 31 subtracts the input margin from the input reception level and outputs information indicating the result (actual reception limit level) to the second comparator 34.
The reception limit level determination unit 32 stores, in a memory, the correspondence between the combination and the theoretical reception limit level for the combination of the digital modulation scheme, error correction scheme, and interleaving depth as a table. Based on this association, the reception limit level determination unit 32 determines a theoretical reception limit level corresponding to the combination of the input digital modulation method, the input error correction method, and the input interleave depth. The indicated information is output to the third comparator 35.

The first comparator 33 inputs the reception level, inputs a predetermined threshold value, and outputs a value based on these to the first display controller 37.
The second comparator 34 receives the actual reception limit level from the difference calculation unit 31, inputs a predetermined threshold value, and outputs a value based on the threshold value to the second display controller 38.
The third comparator 35 receives a theoretical reception limit level from the reception limit level determination unit 32, inputs a predetermined threshold value, and outputs a value based on the threshold value to the third display controller 39. .

  Here, the above-mentioned predetermined threshold value is for determining the relative display position according to the reference on the screen (for example, -90 which is the lowest level shown in FIG. 2 or the scale of the meter). Yes, for example, a plurality of level ranges are defined by threshold values, and values corresponding to the respective level ranges are determined in advance, and each comparator 33 to 35 receives input values (reception levels and actual reception limits). A value corresponding to the level range to which the level or theoretical reception limit level) belongs is output. As a specific example, as a value corresponding to each of a plurality of level ranges, 0 is an output value for an input value of 0 to 29, 30 is an output value for an input value of 30 to 59, and an input of 60 to 89 For the value, an aspect such as 60 as an output value can be used.

The counter 36 receives a predetermined video synchronization signal and outputs a signal for taking horizontal synchronization or vertical synchronization to the display controllers 37 to 40 for display on the monitor 22. This signal determines the display position on the screen.
The first display controller 37 synchronizes with the signal input from the counter 36 and outputs a signal for displaying the reception level meter to the adder 41 based on the value input from the first comparator 33. Output.
The second display controller 38 synchronizes with the signal input from the counter 36 and outputs a signal for displaying the reception limit cursor to the adder 41 based on the value input from the second comparator 34. Output.

The third display controller 39 synchronizes with the signal input from the counter 36 and outputs a signal for displaying the reception limit line to the adder 41 based on the value input from the third comparator 35. Output.
The fourth display controller 40 inputs a predetermined reception level marker display signal, synchronizes with the signal input from the counter 36, and sets the reception level marker based on the input reception level marker display signal. A signal for display is output to the adder 41.
The adder 41 adds display signals input from the display controllers 37 to 40 and outputs the added signal to the monitor 22.

Here, in this example, the configuration in which the receiving device and the display device are separately provided and connected is shown. However, as another configuration example, the function of the receiving device and the function of the display device are integrated. An apparatus can also be implemented.
In addition, a function for acquiring, detecting, and processing various types of information in order to generate a signal for displaying various types of information by the display device may be provided in any place, for example, in a receiving device. A configuration, a configuration provided in the display device, or a configuration provided in a distributed manner in both the reception device and the display device can be used.

FIG. 3 shows an example of display contents within the display range of the screen 51 of the monitor 22.
In the screen display of this example, a reception level marker 61 serving as a scale representing the value of the reception level, a reception level meter 62 representing the reception level in a level meter format by a bar indicator, and a reception limit cursor 63 representing the actual reception limit level. A reception limit line 64 representing a theoretical reception limit level is displayed.
Although illustration is omitted, for example, the same screen 51 displays character information indicating a setting state of various transmission parameters such as a digital modulation method. The transmission parameter is obtained when the signal received from the transmission device is normally demodulated by the reception device.

Specifically, as the reception level marker 61, numerical values representing reception levels such as −90 [dBm], −80 [dBm],..., −50 [dBm] are displayed. The higher the level, the more to the right. In this example, the actual reception limit level and the theoretical reception limit level are also in the same unit as the reception level, and therefore a numerical value is indicated by the reception level marker 61.
In this example, the reception level meter 62 is displayed when the reception level is higher than −90 [dBm]. As the reception level increases, the reception level meter 62 moves to the right with reference to the position of −90 [dBm]. The length of the bar grows. That is, the position on the rightmost side (right end) of the bar represents the reception level. In the example of FIG. 3, the reception level is around −50 [dBm].

As the reception limit cursor 63, a triangular marker is used, and in the example of FIG. 3, one point on the top of the bar of the reception level meter 62 is indicated by one vertex of the triangle. One point indicated by one vertex of this triangle represents an actual reception limit level.
As the reception limit line 64, a vertical line (line) is used, and in the example of FIG. 3, a theoretical reception limit line is indicated by a vertical line passing through the top and bottom of the bar of the reception level meter 62. ing.

As described above, in this example, the reception level is displayed by the reception level marker 61 and the reception level meter 62, and the reception limit cursor 63 and the reception limit line 64 are displayed on the reception level meter 62 so as to be actually displayed. The reception limit level and the theoretical reception limit level are displayed.
Here, the difference between the reception level indicated by the reception level meter 62 and the actual reception limit level indicated by the reception limit cursor 63 represents the margin.
Also, the difference between the actual reception limit level indicated by the reception limit cursor 63 and the theoretical reception limit level indicated by the reception limit line 64 represents a deteriorated portion in the actual transmission path. The smaller this degraded portion, the closer to the ideal transmission path.
In this example, the reception level, actual reception limit level, theoretical reception limit level, and margin are graphically displayed for easy understanding by the operator (person). As a configuration, a configuration in which these are displayed numerically is also conceivable.

The reception limit cursor will be described in more detail with reference to FIGS.
In this example, the calculation range is set for the margin, specifically, the calculation upper limit of the margin is set to 15 [dB], and the margin is calculated in the range of 0 to 15 [dB]. The That is, when the margin is 15 [dB] or more, the margin is calculated as 15 [dB] in all cases. In this case, when the margin of the calculation result is 15 [dB], there is a possibility that the actual demodulated signal has a margin exceeding 15 [dB].
Even if the upper limit of calculation of the margin is set at this level, it can sufficiently withstand the fluctuation of the electric field, and is practically sufficient. Moreover, even if the margin is calculated in an infinite range, it is often wasted.

FIG. 4A shows a display example of the reception level meter 62a and the reception limit cursor 63a when the value is certain because the margin is 0 [dB] or more and less than 15 [dB]. .
Specifically, when the reception level is −70 [dBm] and the margin is 10 [dB], by calculating the difference between the reception level and the margin, the actual reception limit level is −80 [ dBm], and the reception limit cursor 63a is arranged and displayed at the position of −80 [dBm] of the reception level meter 62a on the screen 51 of the monitor 22.
In this case, the position is indicated by one vertex of the triangle constituting the reception limit cursor 63a, and one side of the triangle (side facing the vertex) is parallel to the horizontal line in the horizontal direction of the reception level meter 62a. Deploy.

FIG. 4B shows a display example of the reception level meter 62b and the reception limit cursor 63b when the margin is 15 [dB].
Specifically, when the reception level is −70 [dBm] and the margin is 15 [dB], by calculating the difference between the reception level and the margin, the actual reception limit level is −85 [ dBm] or less, and a reception limit cursor 63b is arranged and displayed at a position of −85 [dBm] of the reception level meter 62b on the screen 51 of the monitor 22.
In this case, the position is indicated by one vertex of the triangle constituting the reception limit cursor 63b, and one side of the triangle (side having the vertex as one end) is parallel to the vertical line in the vertical direction of the reception level meter 62b. The vertices facing the side are arranged so as to face the low level side (left side in this example). That is, visually, the triangle appears to point to the low level side (left side in this example).

4 (c) and 4 (d), the display range of the reception level meter 62 has a lower limit (in this example, −90 [dBm]) and an upper limit (in this example, −50 [dBm]). A display example corresponding to the presence is shown.
FIG. 4C shows a display example of the reception level meter 62c and the reception limit cursor 63c when the calculated value of the difference between the reception level and the margin is less than the lower limit of the reception level meter.
Specifically, when the reception level is −85 [dBm] and the margin is 10 [dB], by calculating the difference between the reception level and the margin, the actual reception limit level is −95 [ In order to indicate that it is less than the lower limit, the reception limit cursor 63c is arranged and displayed at the position of the lower limit (−90 [dBm]) of the reception level meter 62c on the screen 51 of the monitor 22.
In this case, the position is indicated by one vertex of the triangle constituting the reception limit cursor 63c, and one side of the triangle (side having the vertex as one end) is parallel to the vertical line in the vertical direction of the reception level meter 62c. The vertices facing the side are arranged so as to face the low level side (left side in this example). That is, visually, the triangle appears to point to the low level side (left side in this example).

FIG. 4D shows a display example of the reception level meter 62d and the reception limit cursor 63d when the calculated value of the difference between the reception level and the margin exceeds the upper limit of the reception level meter.
Specifically, when the reception level is −30 [dBm], the reception level meter 62d is fully moved to the upper limit, and the margin is 15 [dB], the difference between the reception level and the margin is calculated. Accordingly, the actual reception limit level becomes −45 [dBm], and the reception limit cursor is positioned at the position of the upper limit (−50 [dBm]) of the reception level meter 62d on the screen 51 of the monitor 22 to indicate that the upper limit is exceeded. 63d is arranged and displayed.
In this case, the position is indicated by one vertex of the triangle constituting the reception limit cursor 63d, and one side of the triangle (side having the vertex as one end) is parallel to the vertical line of the reception level meter 62d. The vertices facing the side are arranged so as to face the high level side (right side in this example). That is, visually, it seems that the triangle points to the high level side (right side in this example).

FIG. 5 shows a display example of the reception level meter 62p and the reception limit line 64p in order to explain the display portion of the reception limit line.
In this example, a theoretical reception limit level obtained based on a parameter such as a digital modulation method is stored in advance in the memory of the display device, and the theoretical reception limit level determined based on this is displayed on the screen 51. This is indicated by the reception limit line 64p arranged above.

  As described above, the display device of this example is connected to the receiver 13 of the digital wireless device, receives the reception level obtained by the demodulator of the receiver 13 and the margin calculated by the demodulator, and receives the reception level. The graph is displayed with a bar, the actual reception limit level is displayed with a marker based on the reception level and margin, and the theoretical reception limit level based on the digital modulation method of the received radio signal. Is displayed as a graph with a marker.

Specifically, in the display device of this example, the positional relationship between the current reception level indicated by the reception level meter 62 and the actual reception limit level indicated by the reception limit cursor 63 (in this example, the length of the separation distance). ) To display the margin.
Therefore, the actual reception limit level and margin can be uniquely read by all operators without causing problems due to individual differences such as operator experience values. In addition, for example, even in an environment where the quality of the transmission path fluctuates, the process of dynamically changing can be displayed easily and visually for the operator by continuous graph display.

In the display device of this example, the actual reception limit level is indicated by the reception limit cursor 63 and the theoretical reception limit level is indicated by the reception limit line 64. These markers are simultaneously displayed on the same screen 51. .
Accordingly, since the reception limit cursor 63 and the reception limit line 64 are simultaneously arranged with respect to the same reception level meter 62, it is easy to visually recognize the deterioration of the communication quality in the transmission path from the difference between these positions. can do.
Further, in the display device of this example, as shown in FIGS. 4A to 4D, the reception limit cursor 63 is selected depending on the situation where the margin calculation range and the display range of the reception level meter 62 are exceeded. Switch the direction indicated by. Therefore, such a situation can be displayed easily for the operator to visually grasp.

As an example, video and audio of the same event (for example, marathon relay) are acquired by a plurality of transmission devices and wirelessly transmitted to the reception devices (for example, the same number of reception devices as the transmission devices) of the broadcast station. In this case, when the operator actually switches from the plurality of video and audio to be broadcast in real time, the operator can easily grasp the margin visually by applying the display device of this example. Therefore, it is switched to broadcast video and audio by a reception signal with a large margin, and video and audio by a reception signal with a small margin are switched to video and audio by other reception signals (other cameras and microphones). Can be switched. As another example, it is possible to reduce the number of signal points of the digital modulation scheme for the received signal having a small margin (for example, switching from 64 QAM to 32 QAM, or switching from 32 QAM to 16 QAM).
In the case of digital communication, if the margin is lost, the video and audio of the television etc. will be cut off suddenly. Therefore, as shown in this example, the information necessary for the operator can be displayed very easily. A great effect can be achieved in the field or other fields.

In the display device of this example, the first acquisition unit is configured by the function of inputting information on the reception level itself as information for specifying the reception level from the receiver 13, and information for specifying the actual reception limit level. The second acquisition means is configured by the function of inputting information on the reception level itself and margin information from the receiver 13 as information for specifying the theoretical reception limit level, The third acquisition means is configured by the function of inputting the error correction method information and the interleave depth information from the receiver 13, and the processing units 31 to 41 as shown in FIG. The display control means is configured by the function of controlling the display of.
As another configuration example, in a configuration in which the display device has the same function as the receiver 13, for example, by a function of detecting and acquiring information on the reception level itself based on a reception signal received from the transmission side The first acquisition means can be configured, and the second acquisition means can be configured by a function of detecting and acquiring information on the actual reception limit level itself based on an S / N ratio, a digital modulation method, or the like. The third acquisition means can be configured by a function of specifying and acquiring information on the theoretical reception limit level itself based on information notified from the transmission side.

Here, the configuration of the system and apparatus according to the present invention is not necessarily limited to the configuration described above, and various configurations may be used. The present invention can also be provided as, for example, a method or method for executing the processing according to the present invention, a program for realizing such a method or method, or a recording medium for recording the program. It is also possible to provide various systems and devices.
The application field of the present invention is not necessarily limited to the above-described fields, and the present invention can be applied to various fields.
In addition, as various processes performed in the system and apparatus according to the present invention, for example, the processor executes a control program stored in a ROM (Read Only Memory) in hardware resources including a processor and a memory. A controlled configuration may be used, and for example, each functional unit for executing the processing may be configured as an independent hardware circuit.
The present invention can also be understood as a computer-readable recording medium such as a floppy (registered trademark) disk or a CD (Compact Disc) -ROM storing the control program, and the program (itself). The processing according to the present invention can be performed by inputting the program from the recording medium to the computer and causing the processor to execute the program.

(A), (b) is a figure which shows the structural example of the radio | wireless system based on one Example of this invention. It is a figure which shows the structural example of a display signal production | generation apparatus. It is a figure which shows an example of a screen display. (A)-(d) is a figure which shows the example of a reception limit cursor. It is a figure which shows the example of a receiving limit line.

Explanation of symbols

  1. ・ Compressor, 2,3 ・ ・ Transmitter, 4,11 ・ ・ Antenna, 12,13 ・ ・ Receiver, 14 ・ ・ Expander, 21 ・ ・ Display signal generator, 22 ・ ・ Monitor, 31 ・.. Difference calculator, 32..Reception limit level determination unit, 33 to 35..Comparator, 36..Counter, 37.about.40..Display controller, 41..Adder, 51..Screen, 61 .. Receive level marker, 62, 62a to 62d, 62p ··· Receive level meter, 63, 63a to 63d ··· Receive limit cursor, 64, 64p ··· Receive limit line,

Claims (2)

In a display device that displays graphic information representing the reception status of digital communication,
First acquisition means for acquiring information specifying a reception level;
A second acquisition means for acquiring information identifying an actual reception limit level;
The digital modulation method, error correction method, and interleaving depth are obtained from the display signal input from the receiver, and the theoretical reception limit based on the obtained digital modulation method, error correction method, and interleaving depth is obtained. Third acquisition means for acquiring information for specifying a level;
The reception level specified by the information acquired by the first acquisition means so as to indicate the margin of the reception level by the display arrangement relationship between the graphic information indicating the reception level and the graphic information indicating the actual reception limit level. The graphic information representing the actual reception limit level specified by the graphic information representing and the information acquired by the second acquisition means is displayed , and the theoretical information specified by the information acquired by the third acquisition means is displayed. Display control means for displaying graphic information indicating the reception limit level ;
A display device comprising: The display device according to claim 1,
There is a case where there is a difference from a true value for the specified actual reception limit level and at least one of a case where the specified actual reception limit level is outside the displayable range,
In such a case, the display control means displays the graphic information indicating the actual reception limit level specified by the information acquired by the second acquisition means in a mode different from other cases.
A display device characterized by that.

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