Display processing device and display processing method

Abstract

[Problem] To prevent the occurrence of interference in voice radio communication between multiple vessels or between a vessel and a land station and thereby smoothly start normal voice radio communication. [Solution] A display processing device including: a reception unit that receives a voice radio wave; an analysis processing unit that performs determination of a channel used to propagate the voice radio wave and vessel-land determination for determining whether the output source of the voice radio wave is a vessel or a land station; and a display processing unit that displays the result of the vessel-land determination for the used channel on a screen that displays the time-series variation of the usage of each of available channels.

Description

[Technical Field]

[0001] The present invention relates to a display processing device and a display processing method. [Background technology]

[0002] Conventionally, when performing voice radio communication among multiple ships or between a ship and a land station, users communicate using a predetermined shared channel and then determine a dedicated channel to be used for voice radio communication. Then, each user switches the channel to be used from the shared channel to a dedicated channel and performs voice radio communication using the dedicated channel. Summary of the Invention [Problem to be solved by the invention]

[0003] However, there are cases where the determined dedicated channel is already in use. In such cases, interference occurs between the voice radio waves containing voice data transmitted from each wireless communication device performing voice radio communication and the radio waves transmitted from another wireless communication device already using the same dedicated channel, making it difficult to hear the voices being spoken, and preventing normal voice radio communication. This requires users to determine the dedicated channel again, which is time-consuming and requires a lot of effort.

[0004] The present invention has been made to solve the above-mentioned problems, and its purpose is to provide a display processing device and a display processing method that can prevent interference when conducting voice radio communication between multiple ships or between a ship and a land station, and can smoothly start normal voice radio communication. [Means for solving the problem]

[0005] In order to solve the above problem, a display processing device according to one aspect of the present invention comprises a receiving unit that receives audio radio waves, an analysis processing unit that determines the channel used to propagate the audio radio waves and determines whether the source of the audio radio waves is a ship or a land station, and a display processing unit that displays the results of the land-based determination for the used channel on a screen that shows the time-series changes in usage status for each usable channel.

[0006] In this way, by displaying a screen showing the time series changes in usage status for each channel that can be used, the user of each wireless communication device that performs voice wireless communication can check the screen displayed by the display processing device to understand the channel currently in use and then select a dedicated channel.

[0007] Furthermore, by displaying on the screen whether the source of the voice radio wave is a ship or a land station, the user of each wireless communication device can estimate the use of the currently used channel and select a more appropriate dedicated channel. This prevents interference when conducting voice wireless communication between multiple ships or between a ship and a land station, and ensures that normal voice wireless communication can be started smoothly. [Effects of the Invention]

[0008] According to the present invention, interference can be prevented in advance when conducting voice radio communication between multiple ships or between a ship and a land station, and normal voice radio communication can be smoothly started. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a sequence diagram for explaining a procedure for starting audio wireless communication between wireless communication devices. [Figure 2] FIG. 2 is a sequence diagram for explaining a problem that occurs when starting voice wireless communication between wireless communication devices. [Figure 3]FIG. 3 is a diagram showing a configuration of a display processing device according to an embodiment of the present invention. [Figure 4] FIG. 4 is a diagram showing an example of a screen displayed by the display processing unit in the display processing device according to the embodiment of the present invention. [Figure 5] FIG. 5 is a diagram showing another example of a screen displayed by the display processing unit in the display processing device according to the embodiment of the present invention. [Figure 6] FIG. 6 is a diagram showing another example of a screen displayed by the display processing unit in the display processing device according to the embodiment of the present invention. [Figure 7] FIG. 7 is a flowchart defining an example of an operation procedure when the display processing device according to the embodiment of the present invention displays a screen showing time-series changes in the usage status of each channel. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference numerals, and their description will not be repeated. Furthermore, at least some of the embodiments described below may be combined in any manner.

[0011] <Procedure for starting voice radio communication between radio communication devices> 1 is a sequence diagram for explaining the procedure for starting voice wireless communication between wireless communication devices. Here, a case will be explained in which two wireless communication devices 10, wireless communication devices 10A and 10B, perform voice wireless communication. At least one of the wireless communication devices 10A and 10B is provided on a ship.

[0012] Referring to FIG. 1, first, in accordance with an operation by user A, who is a user of wireless communication device 10A, wireless communication device 10A uses a shared channel "16ch", which is a predetermined frequency band, to transmit to wireless communication device 10B a voice radio wave including voice data for inviting the use of a channel "1ch" corresponding to a certain frequency band as a dedicated channel (step S11).

[0013] Next, upon receiving the call from wireless communication device 10A, wireless communication device 10B uses the shared channel "16ch" to transmit voice radio waves including voice data to respond to wireless communication device 10A requesting that channel "1ch" be used as a dedicated channel, for example, in accordance with the operation of user B, the user of wireless communication device 10B (step S12).

[0014] Next, the wireless communication devices 10A and 10B switch the channel they use from the shared channel "16ch" to the dedicated channel "1ch" in accordance with the operations of the users A and B, respectively (step S13).

[0015] Next, the wireless communication devices 10A and 10B transmit and receive radio waves for voice using the dedicated channel "1ch." This allows a conversation to take place between users A and B (step S14).

[0016] Next, when the conversation between users A and B ends (step S15), wireless communication devices 10A and 10B change the channel they use back from the dedicated channel "1ch" to the shared channel "16ch" in accordance with the operations of users A and B, respectively (step S16).

[0017] <Explanation of the assignment> 2 is a sequence diagram for explaining a problem that occurs when starting audio wireless communication between wireless communication devices. Here, a case where two wireless communication devices 10A and 10B perform audio wireless communication, similar to the case shown in FIG.

[0018] Referring to FIG. 2, the operations from step S21 to step S23 are similar to the operations from step S11 to step S13 shown in FIG. 1, and therefore detailed description thereof will not be repeated here.

[0019] Here, it is assumed that the channel "1ch" that the wireless communication devices 10A and 10B use as a dedicated channel is already being used by the wireless communication device 10C, which is a wireless communication device 10 installed on a ship or a land station. In this case, when each of the wireless communication devices 10A and 10B transmits voice radio waves using the channel "1ch," interference occurs between the voice radio waves from each of the wireless communication devices 10A and 10B and the radio waves from the wireless communication device 10C, making it difficult to hear voices during conversations and preventing normal voice wireless communication (step S24).

[0020] Therefore, the wireless communication devices 10A and 10B change the channel they use back from the dedicated channel "1ch" to the shared channel "16ch" in accordance with the operations of the users A and B, respectively (step S25).

[0021] Next, in accordance with the operation of user A, wireless communication device 10A uses the shared channel "16ch" to transmit, for example, audio radio waves including audio data to encourage wireless communication device 10B to use the channel "2ch" corresponding to another frequency band as a dedicated channel (step S26).

[0022] Next, upon receiving the call from wireless communication device 10A, wireless communication device 10B uses the shared channel "16ch" to transmit voice radio waves including voice data to respond to wireless communication device 10A requesting that channel "2ch" be used as a dedicated channel, for example, in accordance with the operation of user B (step S27).

[0023] Next, in accordance with the operations of users A and B, wireless communication devices 10A and 10B switch the channel they use from the shared channel "16ch" to the dedicated channel "2ch" (step S28), and use the dedicated channel "2ch" to transmit and receive voice radio waves, thereby allowing conversation between users A and B (step S29).

[0024] Next, when the conversation between users A and B ends (step S30), the wireless communication devices 10A and 10B change the channel they use back from the dedicated channel "2ch" to the shared channel "16ch" in accordance with the operations of users A and B, respectively (step S31).

[0025] In this way, if the dedicated channel determined between the users is already in use, the users must determine a new dedicated channel again, which takes a lot of time and effort to ensure normal voice wireless communication. Furthermore, the wireless communication device 10 generally has a limit to the number of channels that can be used simultaneously due to hardware constraints, etc., making it difficult to simultaneously monitor the usage status of all available channels.

[0026] Therefore, the display processing device 201 according to the embodiment of the present invention solves this problem by the following configuration and operation.

[0027] <Display processing device according to an embodiment of the present invention> [Configuration and basic operation] 3 is a diagram showing the configuration of a display processing device according to an embodiment of the present invention. The display processing device 201 is installed on a ship, in a monitoring center of a land station, or the like, and displays on a screen the usage status of each channel that can be used by the wireless communication device 10. By checking the screen displayed by the display processing device 201, the user of each wireless communication device 10 can ascertain the channels currently being used and then select a dedicated channel.

[0028] 3, the display processing device 201 includes a control unit 20, an antenna 21, a receiving unit 22, and a display unit 25. The control unit 20 includes an analysis processing unit 23 and a display processing unit 24. The analysis processing unit 23 has an FFT processing unit 31 and an analysis unit 32. The control unit 20 is, for example, a processing circuit.

[0029] The receiving unit 22 receives audio radio waves containing audio data transmitted from the wireless communication device 10 via the antenna 21, converts the received audio radio waves into a digital signal, and outputs the digital signal to the analysis processing unit 23. The audio data is, for example, audio waveform data.

[0030] The FFT processing unit 31 in the analysis processing unit 23 periodically or irregularly performs FFT processing on the digital signal received from the receiving unit 22 to generate a power spectrum, and outputs the generated power spectrum to the analysis unit 32 and the display processing unit 24.

[0031] The analysis unit 32 periodically or irregularly determines the channel used for the propagation of the audio radio waves received by the receiving unit 22 based on the power spectrum output from the FFT processing unit 31, and outputs the determination result to the display processing unit 24. For example, when the audio radio waves contain frequency components at or above a certain level, the analysis unit 32 determines that the channel corresponding to the frequency components was used.

[0032] The display processing unit 24 displays on the display unit 25 a screen showing the time series changes in usage status for each channel that can be used, based on the power spectrum output from the FFT processing unit 31 and the channel judgment results output from the analysis unit 32.

[0033] Fig. 4 is a diagram showing an example of a screen displayed by the display processing unit in the display processing device according to the embodiment of the present invention. Referring to Fig. 4, the display processing unit 24 displays a screen showing a spectrum color-coded according to the level of the corresponding frequency component for each usable channel. In Fig. 4, instead of color coding, the magnitude of the level is indicated by different thicknesses of the spectrum lines.

[0034] The display processing unit 24 is not limited to a configuration that displays a screen showing a spectrum that is color-coded according to the level of the frequency component, but may also be configured to display a screen showing a spectrum in which the thickness of the lines varies according to the level of the frequency component, as shown in Figure 4.

[0035] The display processing unit 24 also displays a plurality of channels that can be used on the screen. For example, the display processing unit 24 displays figures S1 to S9 that correspond to the channels "11ch" to "19ch" respectively on the screen.

[0036] Here, it is assumed that the shared channel is "16ch." It is also assumed that the wireless communication device 10A is installed on a ship and the wireless communication device 10B is installed in a land station. It is also assumed that user A of the wireless communication device 10A and user B of the wireless communication device 10B have a conversation using the shared channel "16ch" to determine the channel "11ch" as the dedicated channel during the period from time t1 to time t2. In this case, the screen displayed by the display processing unit 24 shows that audio radio waves using the shared channel "16ch" have been intermittently transmitted during the period from time t1 to time t2.

[0037] Furthermore, assume that users A and B have had a conversation through audio wireless communication using the dedicated channel "11ch" from time t2 onward. In this case, the screen displayed by the display processing unit 24 shows that audio radio waves using the dedicated channel "11ch" have been transmitted intermittently from time t2 onward.

[0038] [Various decisions made by the analysis unit and displayed by the display processing unit] The analysis unit 32 determines the channel used to propagate the voice radio waves, and also performs various other determinations regarding the voice radio waves. Details of the determinations regarding the voice radio waves performed by the analysis unit 32 and the display by the display processing unit 24 will be described below.

[0039] (Decision by ship or land) The analysis unit 32 performs a ship-land determination to determine whether the source of the voice radio waves received by the receiving unit 22 is a ship or a land station. In detail, the analysis unit 32 performs the ship-land determination based on the degree of noise in the voice radio waves received by the receiving unit 22.

[0040] More specifically, voice radio waves from ships tend to contain sound data of frequencies outside the frequency band that includes human voices, such as engine noise, and voice radio waves from ships tend to have a higher degree of noise due to frequency fluctuations and the like compared to voice radio waves from land stations.

[0041] Therefore, when determining whether the signal is from a ship or land, for example, if the level of noise in the voice radio waves received by the receiving unit 22 is greater than a predetermined standard, the analysis unit 32 determines that the source of the voice radio waves is a ship.

[0042] On the other hand, in the ship / land determination, for example, if the level of noise in the voice radio waves received by the receiver 22 is equal to or lower than a predetermined standard, the analyzer 32 determines that the source of the voice radio waves is a land station. Then, the analyzer 32 notifies the display processor 24 of the results of the ship / land determination and the results of the determination of the channel used for the voice radio waves being determined.

[0043] When the display processing unit 24 receives a notification from the analysis unit 32, it displays the result of the ship / land determination made by the analysis unit 32 on the screen based on the notification. Specifically, as shown in Fig. 4, for voice radio waves whose sender is a ship and whose channel "16ch" is used, the display processing unit 24 displays the character "ship" around the corresponding frequency component on the screen, and for voice radio waves whose sender is a land station and whose channel "16ch" is used, the display processing unit 24 displays the character "land" around the corresponding frequency component on the screen.

[0044] (Broadcast decision) The analysis unit 32 performs a broadcast determination to determine whether the audio radio waves received by the receiving unit are radio waves used for broadcasting from a land station. More specifically, the analysis unit 32 performs the above-mentioned land / ship determination, and when it detects that the audio radio waves from a land station have been received by the receiving unit 22 continuously for a predetermined time or more, it determines that the audio radio waves are radio waves used for broadcasting from a land station. Then, the analysis unit 32 notifies the display processing unit 24 of, for example, the results of the broadcast determination and the determination results of the channel used for the audio radio waves being determined.

[0045] In addition, even if the voice radio waves from the land station are temporarily not received, the analysis unit 32 determines that the voice radio waves from the land station have been continuously received if the length of the period during which they are not received is less than a predetermined value.

[0046] When the display processing unit 24 receives a notification from the analysis unit 32, it displays the result of the ship / land determination made by the analysis unit 32 on the screen based on the notification. Specifically, as shown in Fig. 4, for audio radio waves used for broadcasting from a land station and using channel "14ch", the display processing unit 24 displays the characters "broadcast" around the corresponding frequency component on the screen.

[0047] (Channel change decision) When the receiving unit 22 continuously receives voice radio waves from the same ship across multiple different channels, the analysis unit 32 performs a channel change determination to determine that a channel change has occurred on the ship.

[0048] More specifically, the analysis unit 32 performs the above-mentioned channel determination and ship / land determination, and identifies the end time of reception of the voice radio waves on the first channel from the ship by the receiving unit 22. The analysis unit 32 also performs the above-mentioned channel determination and ship / land determination, and identifies the start time, after the end time of reception, of reception of the voice radio waves on the second channel from the ship by the receiving unit 22.

[0049] If the difference between the identified reception end time and reception start time is equal to or less than a predetermined value, the analysis unit 32 determines that voice radio waves from the same ship have been continuously received by the receiver 22 across multiple different channels. In this case, the analysis unit 32 determines that a channel change has been made on the ship.

[0050] Then, the analysis unit 32 notifies the display processing unit 24 of, for example, the channel change determination result, the channel before the change, the channel after the change, and at least one of the identified reception end time and reception start time.

[0051] Upon receiving the notification from the analysis unit 32, the display processing unit 24 displays the result of the channel change determination made by the analysis unit 32 on the screen based on the notification.

[0052] Specifically, it is assumed that the display processing unit 24 receives notification from the analysis unit 32 that the channel has been changed from "ch16" to "ch11" and that the start time of reception of audio radio waves using the channel "ch11" is time t2. In this case, the display processing unit 24 displays an arrow X on the screen, for example, as shown in FIG. 4, indicating that the channel has been changed from "ch16" to "ch11" just before time t2.

[0053] The analyzer 32 may be configured to use other methods to determine whether to change channels. For example, voice radio waves transmitted from the same ship tend to have the same level of noise. Therefore, the analyzer 32 may analyze the noise in the voice radio waves received by the receiver 22 and, based on the analysis results, determine that the receiver 22 has continuously received voice radio waves from the same ship across multiple different channels.

[0054] In addition, the analysis processing unit 23 may include a voice recognition unit (not shown), which may analyze the voice data contained in the voice radio waves received by the receiving unit 22 instead of the analysis unit 32, and determine whether a channel change has been made on the ship based on the analysis results.

[0055] More specifically, for example, the voice recognition unit converts the voice data contained in the voice radio waves into text format and outputs it, and if the output text contains characters such as "channel" and "change," it determines that a channel change has occurred on the ship that is the source of the voice radio waves. The voice recognition unit then outputs the determination result to the analysis unit 32, and the analysis unit 32 notifies the display processing unit 24 of the determination result from the voice recognition unit.

[0056] (View available channels) The display processing unit 24 further displays currently unused channels on the screen in a recognizable manner. For example, the display processing unit 24 turns off the figures S corresponding to currently used channels among the figures S1 to S9 corresponding to the channels "11ch" to "19ch" respectively displayed on the screen, and lights up the figures S corresponding to currently unused channels.

[0057] In Figure 4, the figure S1 corresponding to the currently used channel "11ch" is hatched to indicate that it is off, and the figures S2 to S9 corresponding to the currently unused channels "12ch" to "19ch", respectively, are not hatched to indicate that they are lit.

[0058] (Change of display period) 5 and 6 are diagrams showing other examples of screens displayed by the display processing unit in the display processing device according to the embodiment of the present invention.

[0059] 5 and 6, the display processing unit 24 can accept operations by the user of the display processing device 201. For example, when the user operates to set the display period of the screen to one minute, as shown in FIG. 5, a screen showing the usage status of each channel for the last one minute is displayed based on the power spectrum from the FFT processing unit 31 and the channel judgment results from the analysis unit 32.

[0060] Furthermore, for example, when a user performs an operation to set the display period of the screen to one hour, the display processing unit 24 displays a screen showing the usage status of each channel for the last hour based on the power spectrum from the FFT processing unit 31 and the channel judgment results from the analysis unit 32, as shown in FIG. 6.

[0061] (Multiple vessels judgement) Referring again to FIG. 5, the analysis unit 32 performs a multiple ship determination to determine whether or not a plurality of different channels have been used for the propagation of voice radio waves from a plurality of ships.

[0062] More specifically, the wireless communication device 10 cannot simultaneously use multiple different channels. Therefore, the analysis unit 32 performs the channel determination and ship / land determination described above, and when multiple voice radio waves from ships using different channels are received at the same time by the receiving unit 22, it determines that these multiple voice radio waves are voice radio waves transmitted from multiple ships. The analysis unit 32 then notifies the display processing unit 24 of the result of the multiple ship determination and the corresponding multiple channels, for example.

[0063] When the display processing unit 24 receives a notification from the analysis unit 32, it displays on the screen the results of the multiple ship determination made by the analysis unit 32 based on the notification. More specifically, when the analysis unit 32 determines in its multiple ship determination that multiple channels have been used to propagate voice radio waves from multiple ships, the display processing unit 24 displays on the screen the identification information of the multiple ships in association with the multiple channels, respectively.

[0064] Specifically, the display processing unit 24 displays the characters "Ship A" around the frequency component corresponding to the voice radio waves, indicating that the voice radio waves using channel "ch15" were transmitted from the first ship, as shown in Fig. 5. The display processing unit 24 also displays the characters "Ship B" around the frequency component corresponding to the voice radio waves, indicating that the voice radio waves using channel "ch17" were transmitted from the second ship.

[0065] The analysis unit 32 may use other methods to determine whether there are multiple ships. For example, if multiple voice radio waves from ships using different channels have different levels, the analysis unit 32 may determine that these multiple voice radio waves are voice radio waves transmitted from multiple ships.

[0066] (Displays channel utilization) 6, the display processing unit 24 may further display, on the screen, a usage rate per unit time for each available channel in a recognizable manner. The unit time may be, for example, the same length as the display target period selected by the user.

[0067] For example, when a user performs an operation to set the display period of the screen to one hour, the display processing unit 24 calculates the percentage of usage time per most recent hour for each channel and displays the calculated percentage as the usage rate. Specifically, the display processing unit 24 displays usage rates such as "0%" and "30%" inside the figures S1 to S9 corresponding to the channels "11ch" to "19ch", respectively.

[0068] The analyzing unit 32 is not limited to a configuration that performs all of the above-mentioned various determinations regarding the audio radio waves, but may be a configuration that performs some of the above-mentioned various determinations.

[0069] Furthermore, the display processing unit 24 may be configured not to perform at least one of the above-mentioned display of available channels, change of the display target period, and display of the channel usage rate.

[0070] Furthermore, the display processing unit 24 is not limited to a configuration that displays the spectrum of audio radio waves, but may be configured to display on the screen, for example, characters or figures that indicate the time series changes in the usage status of each channel.

[0071] <Operation flow> A display processing device according to an embodiment of the present invention includes a computer including a memory, and a processing unit such as a CPU in the computer reads from the memory and executes a program including some or all of the steps in the following flowcharts and sequences. This program can be installed externally. This program is distributed in a state stored on a recording medium or via a communication line.

[0072] FIG. 7 is a flowchart defining an example of an operation procedure when the display processing device according to the embodiment of the present invention displays a screen showing time-series changes in the usage status of each channel.

[0073] Referring to FIG. 7, first, the receiving unit 22 receives the audio radio waves transmitted from the wireless communication device 10 via the antenna 21, converts the received audio radio waves into a digital signal, and outputs it to the analysis processing unit 23 (step S101).

[0074] Next, the FFT processing unit 31 in the analysis processing unit 23 generates a power spectrum by performing FFT processing on the digital signal received from the receiving unit 22, and outputs the generated power spectrum to the analysis unit 32 and the display processing unit 24 (step S102).

[0075] Next, the analysis unit 32 makes various judgments regarding the audio radio waves, such as determining the channel used to propagate the audio radio waves received by the receiving unit 22, based on the power spectrum output from the FFT processing unit 31, and outputs the judgment results to the display processing unit 24 (step S103).

[0076] Then, based on the power spectrum output from the FFT processing unit 31 and the results of various judgments regarding the audio radio waves output from the analysis unit 32, the display processing unit 24 displays on the display unit 25 a screen showing the time-series changes in usage status for each channel that can be used (step S104).

[0077] However, when communicating via voice radio between multiple ships or between a ship and a land station, the dedicated channel determined between the users may already be in use. In such cases, interference occurs between the voice radio waves containing voice data transmitted from each wireless communication device communicating via the voice radio and the radio waves transmitted from other wireless communication devices already using the dedicated channel, making it difficult to hear the voices being spoken, and preventing normal voice radio communication. This requires the users to determine the dedicated channel again, which requires a lot of time and effort.

[0078] Furthermore, wireless communication devices generally have a limit to the number of channels that can be used simultaneously due to hardware and other constraints, making it difficult to simultaneously monitor the usage status of all available channels.

[0079] In contrast, in the display processing device 201 according to the embodiment of the present invention, the receiving unit 22 receives audio radio waves. The analysis processing unit 23 determines the channel used to propagate the audio radio waves received by the receiving unit 22. The display processing unit 24 displays a screen showing time-series changes in usage status for each usable channel based on the analysis results by the analysis processing unit 23. The analysis processing unit 23 also performs a ship / land determination to determine whether the output source of the audio radio waves received by the receiving unit 22 is a ship or a land station. The display processing unit 24 also displays the results of the ship / land determination by the analysis processing unit 23 on the screen.

[0080] In this way, by displaying a screen showing the time series changes in usage status for each channel that can be used, the user of each wireless communication device 10 that performs voice wireless communication can check the screen displayed by the display processing device 201 to understand the channel currently being used and then select a dedicated channel.

[0081] Furthermore, by displaying on the screen whether the source of the voice radio wave is a ship or a land station, the user of each wireless communication device 10 can estimate the use of the currently used channel and select a more appropriate dedicated channel. This prevents interference when conducting voice wireless communication between multiple ships or between a ship and a land station, and allows normal voice wireless communication to be started smoothly.

[0082] The analysis processing unit 23 also determines whether the vehicle is on land or on the basis of the degree of noise in the voice radio waves received by the receiving unit 22 .

[0083] With this configuration, it is possible to easily and accurately determine whether the vehicle is on land or not, without having to perform complex processing on the voice radio waves.

[0084] Furthermore, the analysis processing unit 23 further performs a multiple ship determination to determine whether or not multiple different channels were used to propagate voice radio waves from multiple ships. If the analysis processing unit 23 determines that multiple channels were used to propagate voice radio waves from multiple ships, the display processing unit 24 displays the identification information of the multiple ships in association with each other on the screen.

[0085] With this configuration, the user of each wireless communication device 10 can check the screen displayed by the display processing device 201 to understand the channel usage status by one or more ships in more detail.

[0086] Furthermore, the analysis processing unit 23 performs a channel change determination to determine that a channel has been changed on the ship when voice radio waves from the same ship are continuously received by the receiving unit 22 across multiple different channels. The display processing unit 24 further displays the result of the channel change determination by the analysis processing unit on the screen.

[0087] With this configuration, the user of each wireless communication device 10 can check the screen displayed by the display processing device 201 to understand the channel usage status by one or more ships in more detail.

[0088] In addition, when determining whether to change channels, if the difference between the time when the receiving unit 22 stops receiving voice radio waves from the ship on the first channel and the time when the receiving unit 22 starts receiving voice radio waves from the ship on the second channel after the reception stop time is less than a predetermined value, the analysis processing unit 23 determines that the receiving unit 22 has continuously received voice radio waves from the same ship across multiple different channels.

[0089] With this configuration, it is possible to make a more accurate channel change decision using time-series changes in the usage status of a plurality of channels.

[0090] In addition, when determining whether to change channels, the analysis processing unit 23 analyzes the noise in the voice radio waves received by the receiving unit 22, and based on the analysis results, determines that voice radio waves from the same ship have been continuously received by the receiving unit 22 across multiple different channels.

[0091] With this configuration, it is possible to easily and accurately determine whether to change channels without performing complex processing on the audio radio waves.

[0092] The analysis processing unit 23 further analyzes the audio data included in the audio radio waves received by the receiving unit 22, and performs a channel change determination based on the analysis result to determine whether a channel change has occurred on the ship. The display processing unit 24 further displays the result of the channel change determination made by the analysis processing unit 23 on the screen.

[0093] With this configuration, the user of each wireless communication device 10 can check the screen displayed by the display processing device 201 to understand the channel usage status by one or more ships in more detail.

[0094] The analysis processing unit 23 also performs a broadcast judgment to determine whether the audio radio waves received by the receiving unit 22 are radio waves used for broadcasting from a land station. The display processing unit 24 further displays the results of the broadcast judgment made by the analysis processing unit 23 on the screen.

[0095] With this configuration, the user of each wireless communication device 10 can check the screen displayed by the display processing device 201 and more accurately grasp the purpose of the channel currently being used.

[0096] Furthermore, in the broadcast judgment, if the receiving unit 22 receives audio radio waves from a land station continuously for a predetermined time or more, the analysis processing unit 23 judges that the radio waves are radio waves used for broadcasting from a land station.

[0097] With this configuration, it is possible to make more accurate broadcast decisions using time-series changes in channel usage.

[0098] Furthermore, the display processing unit 24 further displays, on the screen, channels that are currently unused among a plurality of channels that can be used in a recognizable manner.

[0099] With this configuration, the user of each wireless communication device 10 can more easily select a dedicated channel that can prevent interference by checking the screen displayed by the display processing device 201.

[0100] Furthermore, the display processing unit 24 further displays the usage rate per unit time for each channel that can be used on the screen in a recognizable manner.

[0101] With this configuration, the user of each wireless communication device 10 can check the screen displayed by the display processing device 201 to understand the usage status of multiple channels in more detail and select a more appropriate dedicated channel.

[0102] Furthermore, a display processing method according to an embodiment of the present invention is a display processing method in a display processing device 201. In this display processing method, first, the receiving unit 22 receives audio radio waves. Next, the analysis processing unit 23 determines the channel used to propagate the audio radio waves received by the receiving unit 22, and performs a ship / land determination to determine whether the source of the received audio radio waves is a ship or a land station. Next, the display processing unit 24 displays a screen showing time-series changes in usage status for each usable channel based on the channel determination result by the analysis processing unit 23, and further displays the ship / land determination result by the analysis processing unit 23 on the screen.

[0103] In this way, by displaying a screen showing the time series changes in usage status for each channel that can be used, the user of each wireless communication device 10 that is performing voice wireless communication can check the screen displayed by the display processing device 201 to understand the channel currently being used and then select a dedicated channel.

[0104] Furthermore, by displaying on the screen whether the source of the voice radio wave is a ship or a land station, the user of each wireless communication device 10 can estimate the use of the currently used channel, thereby enabling the selection of a more appropriate dedicated channel. This makes it possible to prevent interference when conducting voice wireless communication between multiple ships or between a ship and a land station, and ensures that normal voice wireless communication can be smoothly started.

[0105] The above-described embodiments should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is defined by the claims, not by the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0106] 10,10A~10C Ship 20 Control Unit 21 Antenna 22 Receiving unit 23 Analysis processing section 24 Display processing section 25 Display section 31 FFT processing section 32 Analysis Department 201 Display processing device S1~S9 shapes

Claims

1. a receiving unit for receiving audio radio waves; an analysis processing unit that determines the channel used for propagation of the voice radio wave and determines whether the source of the voice radio wave is a ship or a land station; a display processing unit that displays the results of the ship-land judgment for the used channel on a screen that shows time-series changes in usage status for each usable channel.

2. The display processing device according to claim 1 , wherein the analysis processing unit makes the determination of whether the vehicle is on land or not based on a degree of noise in the audio radio waves.

3. The analysis processing unit further performs a multiple ship determination to determine whether a plurality of different channels have been used for the propagation of the voice radio waves from a plurality of ships, respectively; The display processing unit further displays on the screen on a display processing device as described in claim 1 or claim 2, when it is determined in the multiple ship determination that multiple channels have been used to propagate the voice radio waves from multiple ships, the multiple channels corresponding to the identification information of the multiple ships.

4. The analysis processing unit further performs a channel change determination to determine that a channel has been changed on the ship when the voice radio waves from the same ship are continuously received by the receiving unit among a plurality of different channels, The display processing device according to claim 1 , wherein the display processing unit further displays a result of the channel change determination on the screen.

5. The display processing device described in claim 4, wherein, in the channel change determination, the analysis processing unit determines that the voice radio waves from the same ship have been continuously received by the receiving unit across multiple different channels if the difference between the time when the receiving unit stops receiving the voice radio waves from the ship on a first channel and the time when the receiving unit starts receiving the voice radio waves from the ship on a second channel after the reception end time is less than a predetermined value.

6. The display processing device described in claim 4, wherein the analysis processing unit, in determining whether to change channels, analyzes noise in the voice radio waves received by the receiving unit, and determines, based on the analysis results, that the voice radio waves from the same ship have been continuously received by the receiving unit across multiple different channels.

7. The analysis processing unit further analyzes the audio data included in the audio radio waves received by the receiving unit, and performs a channel change determination based on the analysis result to determine whether a channel change has been performed on the ship. The display processing device according to claim 1 , wherein the display processing unit further displays a result of the channel change determination on the screen.

8. The analysis processing unit further performs a broadcast determination to determine whether the audio radio wave received by the receiving unit is a radio wave used for broadcasting from a land station, The display processing device according to claim 1 , wherein the display processing unit further displays a result of the broadcast judgment on the screen.

9. The display processing device according to claim 8, wherein the analysis processing unit determines in the broadcast determination that the radio waves for audio from a land station are radio waves used for broadcasting from a land station if the receiving unit receives the radio waves for audio from the land station continuously for a predetermined period of time or more.

10. The display processing device according to claim 1 , wherein the display processing unit further displays, on the screen, a channel that is currently unused among a plurality of channels that can be used in a recognizable manner.

11. The display processing device according to claim 1 , wherein the display processing unit further displays, on the screen in a recognizable manner, a usage rate per unit time for each usable channel.

12. A display processing method in a display processing device, Receives voice radio waves, determining the channel used for propagation of the voice radio wave and determining whether the source of the voice radio wave is a ship or a land station; A display processing method for displaying the results of the ship-land judgment for the used channels on a screen showing time-series changes in the usage status of each usable channel.

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