JP7391716B2 - Reception quality evaluation device - Google Patents

Description

The present invention relates to a reception quality evaluation device that evaluates the reception quality of digital signals such as broadcast signals, and particularly to a reception quality evaluation device that can quickly and accurately identify the cause of deterioration in reception quality.

[Outline of broadcasting system: Figure 13]
An outline of the terrestrial digital broadcasting system will be explained using FIG. 13. FIG. 13 is a schematic diagram showing an example of a terrestrial digital broadcasting system (broadcasting system).
As shown in FIG. 13, the broadcasting system includes, for example, a performance hall that produces broadcast programs, and a master station, important stations, and satellite stations that output (broadcast) the broadcast programs over the air as broadcast waves.

The performance hall and the master station are connected by STL (Studio to Transmitter Link), and the master station and important stations are connected by TTL (Transmitter to Transmitter Link).
The master station transmits the broadcast signal received in STL to an important station in TTL, and also outputs it wirelessly as a broadcast wave.
The important station broadcasts the broadcast signal received in TTL.
Satellite stations receive broadcast waves broadcast from important stations and broadcast (retransmit) them on a different frequency.

[Monitoring of reception status at transmitter: Figure 14]
Monitoring of the reception state at the transmitter will be explained using FIG. 14. FIG. 14 is a schematic explanatory diagram showing monitoring of the reception state in the transmitter.
As shown in FIG. 14, in a performance hall, a time stamp is superimposed on a broadcast signal output from a master facility, and the signal is transmitted to a master station via STL, and further transmitted from the master station to important stations via TTL.

The performance hall is equipped with an STL-TX (Studio to Transmitter Link Transmitter), and the master station is equipped with an STL-RX (Studio to Transmitter Link Receiver).
Further, the master station is equipped with a TTL-TX (Transmitter to Transmitter Link Transmitter), and the important station is equipped with a TTL-RX (Transmitter to Transmitter Link Receiver).

The transmitters of the master station, important stations, and satellite stations are equipped with TV signal measuring devices that receive broadcasted TV signals and measure various items.
Measurement items of the received signal include delay time, constellation, C/N (Carrier to Nose), and BER (Bit Error Rate).

The master station transmitter emits the broadcast signal received by the STL at the master station receiver at an appropriate timing, receives the emitted signal, measures various items with a TV signal measuring device, and performs the performance. The information is sent via a network to an integrated monitoring device installed at a location, etc.

Similarly, the transmitter of the important relay station (important station transmitter) emits the broadcast signal received in TTL at the appropriate timing, and also receives the broadcast signal and measures various items with the TV signal measuring device. and send it to the integrated monitoring device.
In addition, satellite stations (broadcast wave retransmission stations) receive the broadcast waves emitted by important relay stations, emit them at a different frequency, and measure various items using TV signal measurement equipment. and send it to the integrated monitoring device.

Then, the integrated monitoring device displays the measurement results of each transmitter and compares the measurement results of each measurement item with the reference value to determine whether the quality of the received signal has deteriorated. If so, indicate so.

[Cause estimation based on constellation]
Conventionally, when the quality of a received signal has deteriorated, a reception quality evaluation device displays a constellation, and an operator estimates the cause of the signal deterioration from the waveform shape.
A constellation is a diagram expressing data signal points by digital modulation on a two-dimensional complex plane. When reception quality is good, signal points are concentrated at predetermined coordinate points (symbols), but when reception quality deteriorates, the arrangement and shape of symbols change depending on the cause.

The reception quality evaluation device inputs a digital signal or a broadcast wave signal and displays a constellation, and may be provided integrally with the integrated monitoring device or may have a separate configuration.

[Conventional reception quality evaluation device: Figure 15]
A conventional reception quality evaluation device will be explained using FIG. 15. FIG. 15 is a block diagram of a conventional reception quality evaluation device.
As shown in FIG. 15, the conventional reception quality evaluation device 5 includes a signal receiving section 51, a constellation receiving section 52, and a waveform display section 53.

The signal receiving unit 51 receives and demodulates the input broadcast wave signal or digital signal.
The constellation receiving unit 52 converts the demodulated signal into a constellation projection signal arranged on IQ coordinates.
The waveform display section 53 displays a constellation waveform based on the constellation projection signal.

A skilled worker visually observes the constellation waveform displayed on the waveform display section 53 and estimates the cause of the defect in the received signal based on the shape.

[Related technology]
Conventional technologies related to transmission and reception of digital signals or digital terrestrial broadcasting signals include ``STL/TTL relay device'' in Japanese Patent Application Laid-open No. 2001-309201 (Patent Document 1) and ``Relay station monitoring device'' in Japanese Patent Application Laid-Open No. 2012-23709. ” (Patent Document 2), and Japanese Patent Application Laid-open No. 2003-333026 “Remote Monitoring and Control System Using Radio Key” (Patent Document 3).

Patent Document 1 describes an STL/TTL relay device in which an IF bandpass filter for a broadcaster is configured with a digital filter.
Patent Document 2 describes a monitoring device that can promptly detect when a power line of a relay station is disconnected.
Patent Document 3 describes a monitoring control system that can ensure the safety and improve the reliability of the system using a radio key.

Japanese Patent Application Publication No. 2001-309201 Japanese Patent Application Publication No. 2012-23709 JP2003-333026A

However, with conventional reception quality evaluation devices, when the reception quality deteriorates, the operator visually observes the constellation waveform and estimates the cause of the reception quality deterioration from the waveform shape. In addition to requiring skill, it takes time to estimate the cause, and furthermore, there are problems in that the estimation results tend to vary.

In addition, Patent Documents 1 to 3 disclose that the feature amount of the constellation of the input digital signal or broadcast wave signal is calculated, and the feature data of the constellation corresponding to the normal state and a plurality of failure causes stored in advance is calculated. There is no description of whether or not the received quality is normal or not, and if it is abnormal, to identify the cause of the defect by comparing and checking the received quality.

The present invention has been made in view of the above-mentioned circumstances, and it is an object of the present invention to provide a reception quality evaluation device that can quickly, accurately, and highly accurately identify the cause of deterioration of reception quality.

The present invention for solving the problems of the conventional example is a reception quality evaluation device that evaluates the reception quality of a digital signal, and includes a signal reception section that receives and demodulates the digital signal, and a constellation system that converts the demodulated signal into a signal receiver. a constellation receiver that converts the constellation into a projection signal that can be projected; and a constellation receiver that detects feature data of the constellation based on the projection signal, and converts the feature data into a pre-stored normal state and a plurality of abnormalities that differ depending on the cause. The quality of the received digital signal is determined based on the condition and cause corresponding to the determined model pattern by comparing the characteristic data of multiple model patterns corresponding to each condition to determine which model pattern it corresponds to. A feature amount detection unit that determines whether the item is normal or abnormal and, if it is abnormal , identifies the cause of the abnormality, and a feature value detection unit that inputs the cause of the abnormality from the outside and detects the abnormality cause and the cause of the abnormality identified by the feature amount detection unit. and an abnormality content determination unit that instructs the feature detection unit to correct the feature data by adding an external cause of the abnormality if they do not match, and the feature detection unit issues an instruction. When input, processing parameters are adjusted so that the cause of the abnormality included in the instruction is identified .

Further, the present invention provides the reception quality evaluation device, wherein a plurality of signal reception sections and a plurality of constellation reception sections are provided according to a plurality of transmission sources, and the constellation reception section corresponds to a digital signal received from each transmission source. The feature detection section processes a constellation of digital signals received from each transmission source.

According to the present invention, there is provided a reception quality evaluation device for evaluating the reception quality of a digital signal, which includes a signal receiving section that receives and demodulates the digital signal, and converts the demodulated signal into a projection signal that can perform constellation projection. a constellation receiver that detects feature data of the constellation based on the projection signal, and converts the feature data into a plurality of models each corresponding to a pre-stored normal state and a plurality of abnormal states that differ depending on the cause. Comparing it with characteristic data of the pattern, determining which model pattern it corresponds to, and determining whether the quality of the received digital signal is normal or abnormal based on the condition and cause corresponding to the determined model pattern, If there is an abnormality, the feature detection unit performs processing to identify the cause of the abnormality , inputs the cause of the abnormality from the outside, compares the cause of the abnormality with the cause of the abnormality identified by the feature detection unit, and compares the cause of the abnormality with the cause of the abnormality identified by the feature detection unit. and an abnormality content determination unit that instructs the feature detection unit to correct the feature data by attaching an external cause of the abnormality when the instruction is input. The reception quality evaluation device adjusts the processing parameters to identify the problem , so it can determine whether the received signal quality is normal or not based on the constellation, and if it is abnormal, quickly identify the cause of the abnormality, regardless of the operator. In addition , it is possible to accurately identify, reduce the variation in judgments, and take action based on the judgment results, improving the reliability of the communication system. The feature amount detection unit can be trained again by feeding back, which has the effect of improving the accuracy of determining whether reception quality is normal/abnormal and identifying the cause of a defect .

Further, according to the present invention, a plurality of signal reception sections and a plurality of constellation reception sections are provided according to a plurality of transmission sources, and the constellation reception section outputs a projection signal corresponding to a digital signal received from each transmission source. However, since the feature detection unit is the reception quality evaluation device described above that processes the constellation of digital signals received from each transmission source, it is possible to evaluate the reception quality at multiple transmission sources using one reception quality evaluation device. It has the effect of improving convenience and reliability of the communication system.

FIG. 2 is a configuration block diagram of a first reception quality evaluation device. FIG. 2 is an explanatory diagram showing a general constellation. FIG. 3 is an explanatory diagram showing movement of a constellation due to frequency abnormality. FIG. 2 is an explanatory diagram showing movement of a constellation due to phase abnormality. FIG. 3 is an explanatory diagram showing movement of a constellation due to CN deterioration. FIG. 3 is an explanatory diagram showing movement of a constellation due to amplitude abnormality. FIG. 3 is an explanatory diagram showing movement of a constellation due to gain imbalance. FIG. 3 is an explanatory diagram showing movement of a constellation due to carrier leakage. FIG. 2 is an explanatory diagram showing the configuration of an applied example of the first reception quality evaluation device. FIG. 3 is a configuration block diagram of a second reception quality evaluation device. 7 is a flowchart showing the processing of the abnormality content determination unit 25. FIG. FIG. 7 is an explanatory diagram showing an application example of the second reception quality evaluation device. 1 is a schematic diagram showing an example of a terrestrial digital broadcasting system (broadcasting system). FIG. 2 is a schematic explanatory diagram illustrating monitoring of a reception state in a transmitter. FIG. 1 is a block diagram illustrating the configuration of a conventional reception quality evaluation device.

Embodiments of the present invention will be described with reference to the drawings.
[Overview of embodiment]
A reception quality evaluation device according to an embodiment of the present invention (this reception quality evaluation device) demodulates an input digital signal or broadcast wave signal to generate a constellation projection signal, and based on the constellation projection signal, , calculates the feature data (feature amount or image pattern) of the constellation (position and shape of symbol points) in the received signal, and applies the calculated feature data to pre-stored normal conditions and multiple failure causes. It compares and matches the constellation characteristic data obtained, selects the closest one, and determines whether the reception quality is normal or not, and if it is not normal, identifies and displays the cause of the failure. The cause of the failure can be quickly and accurately identified even if there is no operator skilled in analysis, and the convenience and reliability of the communication system can be improved.

In addition, this reception quality evaluation device inputs the result of a determination of the cause of failure by a skilled worker regarding the constellation displayed based on the constellation projection signal, and calculates the characteristic data to obtain the determination result. Since the parameters are readjusted, it is possible to improve the accuracy of calculating feature data and improve the accuracy of analyzing the cause of failure.

In this embodiment, the reception quality evaluation device will be described as being provided integrally with the integrated monitoring device in, for example, the broadcasting system shown in FIG. 14, but it may be an independent configuration. Furthermore, the present reception quality evaluation device evaluates reception quality not only in broadcasting systems but also in devices that receive digital signals capable of displaying constellations.

[Configuration of first reception quality evaluation device: Figure 1]
The configuration of a reception quality evaluation device (first reception quality evaluation device) according to a first embodiment of the present invention will be described using FIG. 1. FIG. 1 is a configuration block diagram of a first reception quality evaluation device.
The first reception quality evaluation device converts the received digital signal or broadcast wave signal into a constellation, calculates the characteristic amount of the waveform, and creates model patterns for normal conditions and model patterns for each cause of failure that are stored in advance. This method identifies the state (normal or abnormal due to any defective cause) that corresponds to the model pattern closest to the model pattern, and in particular allows the cause of the defective to be identified quickly and accurately.

As shown in FIG. 1, the first reception quality evaluation device 1 includes a signal reception section 11, a constellation reception section 12, a waveform content calculation section 13, a feature amount detection section 14, and an abnormality content display section 15. It is equipped with

The signal receiving unit 11 receives and demodulates a digital signal or a broadcast wave signal (hereinafter referred to as a digital signal) that can be displayed in a constellation waveform, and outputs a demodulated signal.
The constellation receiving unit 12 converts the demodulated signal into a constellation projection signal that can display a constellation on two-dimensional coordinates, and outputs the constellation projection signal.
The signal receiving section 11 and the constellation receiving section 12 are the same parts as a conventional reception quality evaluation device.

The waveform content calculation unit 13 calculates information representing waveform characteristics from the constellation projection signal and outputs it as a constellation pattern calculation result. The constellation pattern calculation result is numerical data for calculating the feature amount.

The feature amount detection unit 14 calculates a feature amount from the constellation pattern calculation result, compares it with data indicating the characteristics of a plurality of constellation patterns (model patterns) stored in advance, and determines which model pattern it corresponds to. Based on this, it is determined whether the reception quality is normal or not, and if it is abnormal, the cause is specified and outputted as an abnormality content determination signal. In other words, the abnormality content determination signal may indicate "normal".

The waveform content calculation unit 13 and the feature amount detection unit 14 are both configured by an arithmetic processing device or an arithmetic processing circuit, and the waveform content calculation unit 13 and the feature amount detection unit 14 may be realized by one arithmetic processing device. . The feature amount detection section described in the claims includes the functions of the waveform content calculation section 13 and the feature amount detection section 14.

Comparison with the model pattern in the feature detection unit 14 will be explained.
The feature detection unit 14, for example, determines the degree of similarity (correlation value) between the constellation of the received signal and the feature data of the model pattern, and identifies the model pattern closest to the constellation of the received signal. The operation of the feature detection unit 14 will be described later.

Furthermore, the feature amount detection unit 14 may be configured with a trained model using AI (Artificial Intelligence).
Specifically, this is achieved using a trained model that has trained to classify constellations into the seven types of model patterns described below using training data that associates a large amount of constellation waveform features with their failure causes. do.
There are one type of model pattern indicating normality and six types indicating abnormality, and the model patterns indicating abnormality are different patterns depending on the factor (cause of abnormality).

When using AI, the feature amount detection unit 14 inputs various feature amounts calculated for the input constellation into a trained model, and performs calculations such as weighting and adding each feature amount in the trained model. Then, identify the model pattern with the highest degree of similarity. This makes it possible to identify whether the quality of the received signal is normal or abnormal, and if abnormal, the cause of the failure.

The abnormality content display section 15 displays whether the quality of the received signal is normal or abnormal, and if abnormal, the cause thereof, based on the abnormality content determination signal.
The abnormality content display signal is also output to the outside of the first reception quality evaluation device, and the abnormality content is notified to other display units of the integrated monitoring device, external devices, etc. via a wired or wireless network. be done.

[General constellation: Figure 2]
Here, before explaining the model patterns stored in the feature detection unit 14, a general constellation will be explained using FIG. 2. FIG. 2 is an explanatory diagram showing a general constellation.
As shown in FIG. 2, QPSK (Quadrature Phase Shift Keying) has four types of symbols, 16QAM (Quadrature Amplitude Modulation) has 16 types of symbols, and 64QAM has a constellation of 64 types of symbols arranged in an orderly manner.
The QPSK constellation shown in FIG. 2 is stored in the feature detection unit 14 as a normal model pattern.

[Constellation during abnormality: Figures 3 to 8]
The model patterns at abnormal times stored in the feature detection unit 14 will be explained using FIGS. 3 to 8. When there is an abnormality in reception quality, a characteristic constellation movement is displayed depending on the cause of the abnormality.
In addition, in FIGS. 3 to 8, the case of QPSK will be explained as an example, but even if the number of multilevel modulation increases, QPSK This can be determined using a method similar to the above.

FIG. 3 is an explanatory diagram showing the movement of the constellation due to frequency abnormality.
If there is a frequency abnormality on the transmitting side (for example, the transmitters of the main station, important station, and satellite station), the points of the constellation rotate in the same direction clockwise or counterclockwise, as shown in Figure 3. .

FIG. 4 is an explanatory diagram showing the movement of the constellation due to phase abnormality.
If there is a phase abnormality on the transmitting side, as shown in FIG. 4, a reciprocating motion is performed, going back and forth clockwise or counterclockwise.

FIG. 5 is an explanatory diagram showing the movement of the constellation due to CN deterioration.
When there is CN degradation on the transmitting side or on the transmission path, each point of the constellation becomes equally thick (larger) as shown in FIG.

FIG. 6 is an explanatory diagram showing the movement of the constellation due to amplitude abnormality.
When there is an amplitude abnormality on the transmitting side, the points of the constellation spread outward from the center in a substantially triangular shape, as shown in FIG.

FIG. 7 is an explanatory diagram showing the movement of the constellation due to gain imbalance.
When the transmitting side is transmitting a signal using a multicarrier method and the amplitudes of each carrier are unbalanced, the constellation point may be shifted from a predetermined position on the ellipse as shown in Figure 7. Move to position.

FIG. 8 is an explanatory diagram showing the movement of the constellation due to carrier leakage.
When carrier leakage occurs in the conversion between the baseband frequency and the RF frequency on the transmitting side, the center positions of all the points of the constellation shift while maintaining the mutual distance between the points of the constellation.

The feature detection unit 14 stores a normal model pattern shown in QPSK in FIG. 2 and model patterns corresponding to the six types of abnormal causes shown in FIGS. 3 to 8. Specifically, the feature amount detection unit 14 calculates and stores data (model data) in which the features of each model pattern are quantified in advance for each model pattern.

Then, the feature amount detection unit 14 performs a calculation to compare the feature amount of the constellation of the received signal and the model data representing the characteristics of the seven types of model patterns (movements of the constellation) described above, and calculates the highest correlation. High model data is identified, and an abnormality content determination signal indicating the abnormality content (normal or any abnormality cause) corresponding to the model data is output.

To calculate the feature amount, for example, the difference between each signal point in the constellation of the received signal and the ideal symbol position is obtained as an error vector, and the feature amount of the constellation of the received signal is calculated based on the error vector. Good too.

In addition, here, the feature values are calculated and numerically compared for the received signal constellation and the model pattern constellation, but image analysis is performed using the image data of the constellation itself, and the model pattern You can also compare it with the image.
The feature data described in the claims corresponds to feature amounts or image data.

[Application example of the first reception quality evaluation device: Figure 9]
Next, an application example of the first reception quality evaluation device will be described using FIG. 9. FIG. 9 is an explanatory diagram showing the configuration of an applied example of the first reception quality evaluation device.
As shown in FIG. 9, the first application example of the reception quality evaluation device includes a plurality of (n) sets of signal reception sections and constellation reception sections, and the reception quality evaluation device 10 of the application example has different The reception quality at n transmitters installed at a location is evaluated.

Specifically, the first application example includes signal receiving units 11-1 to 11-n that receive digital signals from different transmitters, and constellation receiving units 12-1 to 12-n, Constellation projection signals are output from each of the constellation receiving units 12-1 to 12-n and input to the waveform content calculation unit 13.
In the example of FIG. 9, it is assumed that the signal receiving sections 11-1 to 11-n and the constellation receiving sections 12-1 to 12-n are provided in the TV signal measuring device shown in FIG. It may also be provided in the quality evaluation device 10.

The digital signals output from each signal receiving section 11-1 to 11-n include the identification number of the transmission source, and the reception quality evaluation device 10 can identify which transmitter the digital signal is from. It becomes.
The operations of the signal receiving sections 11-1 to 11-n and the constellation receiving sections 12-1 to 12-n are similar to those of the first reception quality evaluation device 1.

Furthermore, the waveform content calculation unit 13, feature quantity detection unit 14, and abnormality content display unit 15 of the reception quality evaluation device 10 of the first application example are also similar to those of the first reception quality evaluation device 1.
In the first application example, when a constellation projection signal is input from the constellation receiving sections 12-1 to 12-n, the waveform content calculation section 13 calculates the waveform as in the first reception quality evaluation device 1. The feature amount detection unit 14 calculates the feature amount from the constellation pattern calculation result, identifies the model pattern closest to the reception quality from the feature amount, and the abnormality content display unit 15 displays the identification information of the transmitter. It also displays whether the reception quality is normal or abnormal, and if abnormal, the cause of the failure.
The received signals in each of the signal receiving units 11-1 to 11-n are processed independently.

This makes it possible to evaluate the reception quality at a plurality of transmitters using one reception quality evaluation device and display the results.
In particular, it is possible to collectively monitor the reception quality of a plurality of transmitters installed over a wide area, which improves convenience.

[Effects of the first embodiment]
According to the first reception quality evaluation device, the signal receiving unit 11 demodulates the input digital signal or broadcast wave signal, and the constellation receiving unit 11 generates a constellation projection signal from the demodulated signal, and the waveform content is The calculation unit 13 determines the position of each signal point on the two-dimensional coordinates based on the constellation projection signal, and the feature amount detection unit 14 calculates the feature amount of the constellation in the received signal. is compared with pre-stored model data that quantifies constellation characteristics corresponding to normal conditions and multiple failure causes, and the closest one is selected to determine whether the reception quality is normal or not. Furthermore, if it is not normal, it identifies the cause of the abnormality, displays it on the abnormality content display area, and outputs it to the outside, so it can quickly and accurately identify the cause of the abnormality, even if there is no operator skilled in constellation analysis. can be specified, displayed, and notified, which has the effect of improving convenience and reliability of the communication system.

Further, according to the application example of the first reception quality evaluation device, there are signal receiving sections 11-1 to 11-n that receive digital signals from different transmitters, and constellation receiving sections 12-1 to 12-n. Since the reception quality evaluation device 10 is used to evaluate the reception quality of multiple transmitters, one reception quality evaluation device 10 can be used to evaluate the reception quality of a plurality of transmitters and determine whether each transmitter is normal or abnormal. In addition, in the case of an abnormality, the cause can be displayed and notified, which has the effect of improving convenience and reliability of the communication system.

[Configuration of second reception quality evaluation device]
Next, the configuration of a reception quality evaluation device (second reception quality evaluation device) according to a second embodiment of the present invention will be described using FIG. 10. FIG. 10 is a block diagram of the configuration of the second reception quality evaluation device.
The second reception quality evaluation device 2 has a feature detection unit equipped with an AI learning function, and adjusts the learned model by feeding back the analysis results of skilled workers, thereby improving the accuracy of identifying the cause of abnormality. It is something that makes you

As shown in FIG. 10, the second reception quality evaluation device 2 includes a signal reception section 21, a constellation reception section 22, a waveform content calculation section 23, a feature amount detection section 24, and an abnormality content determination section 25. , and an abnormality content display section 27.

Of the above-mentioned components, the signal receiving section 11, constellation receiving section 22, waveform content calculation section 23, and abnormality content display section 27 are the same as those in the first reception quality evaluation device 1 described above, so their explanation will be omitted. .
Furthermore, a waveform display section 30 that displays a constellation waveform based on the constellation projection signal from the constellation receiving section 22 is connected to the second reception quality evaluation device 2 . The waveform display section 30 is equivalent to the waveform display section 53 provided in the conventional reception quality evaluation device 5 shown in FIG.

Characteristic parts of the second reception quality evaluation device 2 will be explained.
The abnormality content input section 26 is an input section into which normality/abnormality specified by a skilled worker and, in the case of an abnormality, the cause of the abnormality (defect cause) are input.
Specifically, a skilled worker visually observes the constellation waveform displayed on the waveform display section 30, determines whether it is normal or falls under any of the six causes of abnormality, and enters the abnormality content input section. 26. Information from the abnormality content input unit 26 is sent to the abnormality content determination unit 25 as an abnormality content transmission signal.

The feature quantity detection unit 24 is configured by an AI equipped with the above-mentioned trained model, and weights the various input feature quantities to classify (tentatively determine) the above-mentioned seven types of model patterns, and tentatively determines the content of the abnormality. Output as a decision signal.
Furthermore, as a feature of the second reception quality evaluation device 2, the feature amount detection section 24 adjusts parameters based on the feature amount correction signal (described later) fed back from the abnormality content determination section 25. It is designed to improve classification accuracy.

The abnormality content determination section 25 compares the contents from the feature amount detection section 24 and the abnormality content input section 26, determines the abnormality contents, and outputs the determined abnormality contents as an abnormality content determination signal. The abnormality details include whether the reception quality of the received signal is normal or not, and if abnormal, the cause of the abnormality.
Specifically, when the abnormality content determination unit 25 receives the abnormality content provisional determination signal from the feature quantity detection unit 24, the abnormality content determination unit 25 retains the content of the signal (information regarding normality or any of the six types of abnormality causes). Then, the content is compared with the content of the abnormality content transmission signal input from the abnormality content input section 26, and if the contents match, the content is output to the abnormality content display section 27 and displayed.

In addition, if the content of the temporary abnormality content determination signal from the feature amount detection unit 24 and the content of the abnormality content transmission signal from the abnormality content input unit 26 are different, the abnormality content determination unit 25 corrects the feature amount. As a signal, the content of the abnormality content transmission signal is fed back to the feature detection unit 24.

Upon receiving the feature correction signal, the feature detection unit 24 extracts features and extracts various feature amounts so that the result of calculation for the constellation pattern calculation matches (approaches) the content of the feature correction signal. The model is re-trained by adjusting the parameters such as changing the weighting of the abnormality content tentative determination signal, and the error content tentative determination signal is output again.
Furthermore, when the feature amount detection unit 24 does not receive the feature amount correction signal, it maintains the currently set parameters assuming that the tentative determination result is correct.

As a result, the trained model of the feature quantity detection unit 24 classifies the input constellation pattern result and correct answer every time a constellation is evaluated (regardless of whether it matches the content of the abnormal content transmission signal). The combination of results can be obtained as training data and learned again, thereby improving classification accuracy.

Further, the abnormality content determination unit 25 not only detects cases where the contents of the abnormality content provisional determination signal from the feature quantity detection unit 24 and the contents of the abnormality content transmission signal from the abnormality content input unit 26 are different, but also determines whether they match. It may also be configured to output a feature amount correction signal even if the answer is correct (if the answer is correct).
That is, the abnormality content determining unit 25 outputs a feature amount correction signal to the feature amount detection unit 24 every time the abnormality content transmission signal is input. Thereby, the feature amount detection unit 24 performs relearning based on the feature amount submission signal, including when the answer is correct.
Note that when AI is not used, the content of the fed-back abnormality content transmission signal may be accumulated in the feature amount detection unit 24 and used for pattern identification.

[Processing of the abnormality content determination unit: Figure 11]
Next, the processing in the abnormality content determining section 25 of the second reception quality evaluation device will be explained using FIG. 11. FIG. 11 is a flowchart showing the processing of the abnormality content determination unit 25.
As shown in FIG. 11, the abnormality content determination unit 25 inputs the abnormality content transmission signal from the abnormality content input unit 26 (S11), and receives the abnormality content provisional determination signal from the feature quantity detection unit 24 (S12). It is determined whether the contents of both match (S13).

If the contents of both match in step S13 (in the case of Yes), the abnormality content determination unit 25 determines the abnormality content based on the content, outputs an abnormality content determination signal (S15), and ends the process. . As a result, the abnormality content display section 27 displays normality/abnormality and the cause of the failure in the case of abnormality.

If the contents of the two do not match in step S13, the abnormality content determination unit 25 outputs the contents of the abnormality content transmission signal to the feature detection unit 24 as a feature correction signal (S14).
Then, the process moves to process 12, in which the feature amount detection unit 24 adjusts parameters and the like, and inputs the tentative abnormality content determination signal that has been specified again.
In other words, readjustment of the parameters is repeated until the content of the temporary abnormality content determination signal matches the content of the abnormality content transmission signal.
In this manner, the processing of the abnormality content determination unit 25 is performed.

[Application example of second reception quality evaluation device: Figure 12]
Next, an application example of the second reception quality evaluation device will be described using FIG. 12. FIG. 12 describes an application example of the second reception quality evaluation device using FIG. FIG. 12 is an explanatory diagram showing an application example of the second reception quality evaluation device.
As shown in FIG. 12, the application example of the second reception quality evaluation device receives digital signals from a plurality of transmitters, similar to the application example of the first reception quality evaluation device shown in FIG. , signal receiving sections 21-1 to 21-n and constellation receiving sections 23-1 to 23-n are provided to generate constellation projection signals.
Each component of the reception quality evaluation device 20 is similar to the second reception quality evaluation device.

In the application example of the second reception quality evaluation device, each of the plurality of received signals is converted into a constellation, and the feature amount detection unit 24 calculates the feature amount to identify which of the seven model patterns it is classified into. At the same time, the abnormality content determination unit 25 compares the constellation with the correct classification result by the skilled worker input from the abnormality content input unit 26, and if they do not match, sends the correct classification result to the feature quantity detection unit 24. Based on the feedback, the feature amount detection unit 24 adjusts the parameters of the AI-trained model, improving the accuracy of determining whether the reception quality is normal and identifying the cause if it is abnormal. It is possible.

[Effects of the second embodiment]
According to the second reception quality evaluation device, the abnormality content determination unit 25 determines the content of the abnormality content transmission signal input from the abnormality content input unit 26 and the content of the abnormality content tentative determination signal from the feature quantity detection unit 24. If they match, it is output as an abnormal content determination signal, and if they do not match, the content of the abnormal content transmission signal is output as a feature quantity correction signal to the feature quantity detection unit 24, and the feature quantity Since the detection unit 24 adjusts various parameters so that the calculation result matches the content of the feature quantity correction signal, the analysis result by an operator skilled in constellation analysis is input from the abnormality content input unit 26. By doing so, it is possible to make the feature detection unit 24 learn again, thereby improving the accuracy of determining whether the reception quality is normal or abnormal and identifying the cause of a defect.

[Alarm distribution device at transmitting station]
When a failure or malfunction occurs in a transmitter of a master station, important station, satellite station, etc. (hereinafter referred to as a transmitting station) in a broadcasting system, it is necessary to promptly notify various locations. Therefore, an alarm distribution device was installed at each transmitting station to distribute alarms.
The alarm distribution device will be briefly explained.

The transmitting station is equipped with monitoring equipment that monitors the status of broadcasters (transmitters) and other equipment, as well as surveillance cameras that take pictures of various locations.Alarm distribution equipment operates in conjunction with the monitoring equipment and surveillance cameras. I do.
Monitoring information and alarm information acquired by the monitoring device are recorded on the logger terminal.
Further, images acquired by a surveillance camera and images of an operation screen of an operation terminal are recorded in a recording device.

Then, when alarm information is input from the monitoring device, the alarm distribution device acquires monitoring information and alarm information from the logger terminal from several seconds before the alarm occurs to several seconds after, and from the recording device, the alarm information of the target device at the time of the alarm occurrence. Obtain captured video and images of the operation screen.
Then, the alarm distribution device creates an email by incorporating the alarm occurrence date and time and alarm content into the body, attaches the captured video and the image of the operation screen, and sends the email to a pre-stored email distribution destination.

This allows the person in charge who receives the email to visually and intuitively understand the alarm content not only through text information, but also through captured video and images of the operation screen, allowing them to respond quickly and perform failure analysis. be.

Further, the alarm distribution device controls the panning, tilting, and zooming of the surveillance camera that photographs the alarm target to photograph more detailed images.
This makes it possible to understand the state of the alarm target in more detail and to take appropriate troubleshooting measures.

INDUSTRIAL APPLICATION This invention is suitable for the reception quality evaluation apparatus which can identify the cause of deterioration of reception quality quickly, accurately, and with high precision.

1, 2, 5, 10, 20... Reception quality evaluation device, 11, 21, 51... Signal receiving section, 12, 22, 52... Constellation receiving section, 13, 23... Waveform content calculation section, 14, 34... Features Quantity detection section, 15, 27... Abnormality content display section, 26... Abnormality content input section, 25... Abnormality content determination section, 30, 53... Waveform display section

Claims (2)

A reception quality evaluation device that evaluates reception quality of a digital signal,
a signal receiving section that receives and demodulates the digital signal;
a constellation receiving unit that converts the demodulated signal into a projection signal capable of constellation projection;
Based on the projection signal, feature data of the constellation is detected, and the feature data is converted into feature data of a plurality of model patterns corresponding to a normal state stored in advance and a plurality of abnormal states that differ depending on the cause. and determine which model pattern it corresponds to, and determine whether the quality of the received digital signal is normal or abnormal based on the condition and cause corresponding to the determined model pattern. a feature detection unit that performs processing to identify the cause of the abnormality, if any ;
A cause of the abnormality is input from the outside, and the cause of the abnormality is compared with the cause of the abnormality identified by the feature amount detection unit. If they do not match, the cause of the abnormality from the outside is added and the feature amount is detected. an abnormality content determining unit that instructs the unit to correct the characteristic data;
A reception quality evaluation device characterized in that, when the feature detection unit inputs the instruction, it adjusts processing parameters so that the cause of the abnormality included in the instruction is identified . A plurality of signal receiving sections and a plurality of constellation receiving sections are provided according to the plurality of transmission sources,
The constellation receiving unit outputs a projection signal corresponding to the digital signal received from each transmission source,
2. The reception quality evaluation device according to claim 1 , wherein the feature detection section processes a constellation of digital signals received from each of the transmission sources.

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