JP7149446B2 - Time information acquisition device and synchronization signal conversion device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a time information acquisition device and a synchronization signal conversion device that are installed in a base station of a mobile communication system, and in particular, efficiently selects a broadcast channel with good radio quality from broadcast signals of digital terrestrial broadcasting to obtain time information. The present invention relates to a time information acquisition device and a synchronization signal conversion device capable of acquiring information.

[Description of prior art]
A synchronization signal conversion device provided in a base station of a mobile communication system generates a synchronization signal synchronized with the reference time of GPS (Global Positioning System) and supplies it to the system. This makes it possible to match the timing of communication in the entire system.

A conventional synchronous signal conversion device implements a clock, acquires the time from the clock, uses time synchronization information distributed via a wired network specified by IEEE 1588, or receives GPS signals to obtain time information. Some take it and generate a sync signal based on it.

However, when implementing a clock, if the precision of the clock is low, the time will be off.
In addition, when time information is acquired from a wired network, it is necessary to separately prepare facilities for connecting to the network, which increases costs and poses security problems.
When acquiring time information from a GPS signal, the GPS antenna must be installed outdoors, so it cannot be used indoors.

[Related technology]
Incidentally, as conventional technology of a synchronization signal conversion device using broadcast waves, Japanese Patent No. 6363906 "Synchronization Signal Conversion Device" (Patent Document 1), International Publication No. 2016/194518 "Synchronization Signal Conversion Device" (Patent Document 2).
In Patent Document 1, a broadcast wave synchronization signal is acquired from a broadcast wave, and the broadcast wave synchronization signal is converted into a frame timing signal conforming to the GPS signal based on the timing difference from the synchronization signal of the original GPS reception signal. , generating a pseudo GPS reception signal from which the frame timing signal is extracted and outputting it to a base station.

In Patent Document 2, when the broadcast wave synchronization signal is converted into a pseudo GNSS (Global Navigation Satellite System) received signal, the offset value of the broadcast wave synchronization signal is measured, and the broadcast wave synchronization signal Adjusting the timing is described.

Japanese Patent No. 6363906 WO2016/194518

As described above, the conventional synchronizing signal converter has problems such as an increase in equipment cost and difficulty in indoor use.
In addition, conventional synchronization signal conversion devices using broadcast waves cannot efficiently select channels for obtaining time information.

Note that Patent Documents 1 and 2 do not describe selecting and executing a process of searching for a channel from which time information is to be obtained according to user settings.

The present invention has been made in view of the above-mentioned actual situation, and is capable of generating a synchronization signal at a low cost regardless of whether it is indoors or outdoors. It is an object of the present invention to provide a time information acquisition device and a synchronization signal conversion device that can acquire the time information.

The present invention for solving the problems of the conventional example is a time information acquisition device for receiving broadcast waves of digital terrestrial broadcasting and acquiring time information contained in the broadcast waves, comprising: an antenna for receiving the broadcast waves; , a broadcast wave signal receiver that selects and demodulates the set channel, measures the radio quality, and extracts time information; and broadcast wave time information that can be converted into a synchronization signal based on the extracted time information. When searching for a broadcast wave time information generation unit that generates and outputs a time information acquisition channel that extracts time information, all channels of digital terrestrial broadcast waves are sequentially set to the broadcast wave signal reception unit, and set Broadcast wave signal control that acquires and stores the radio quality of the selected channel and selects the channel with the best radio quality among all the channels as the time information acquisition channel in the broadcast wave signal receiving unit. It is characterized by having a part.

Further, in the time information acquisition device of the present invention, when the broadcast wave signal control unit searches for the time information acquisition channel, it designates a preset first channel before searching all channels. Set the broadcast wave signal receiving unit as a channel, acquire the radio quality of the first channel, and if the radio quality of the first channel is equal to or higher than a specific quality, set the first channel as the time information acquisition channel is set in the broadcast wave signal receiving unit to select a channel.

Further, in the above-described time information acquisition device, the broadcast wave signal control unit sets a preset second channel as a priority channel in the broadcast wave signal reception unit when searching for the time information acquisition channel. , acquire the radio quality of the second channel, and if the radio quality of the second channel is equal to or higher than a specific quality, set the second channel as the time information acquisition channel in the broadcast wave signal receiving unit. If the radio quality of the second channel is less than a specific quality, the channel with the best radio quality in the search of all channels is selected as the time information acquisition channel to the broadcast wave signal receiving unit. It is characterized by setting and tuning.

Further, in the time information acquisition device of the present invention, the broadcast wave signal control unit periodically acquires the radio quality of the time information acquisition channel selected by the broadcast wave signal reception unit, If the radio quality is equal to or higher than a specific quality, the broadcast wave signal receiving unit continues to select the channel, and if the radio quality is less than the specific quality, another time information acquisition channel is characterized by performing a process of searching for

According to another aspect of the present invention, there is provided a synchronizing signal conversion device comprising: any one of the time information acquisition devices described above; It is characterized by

According to the present invention, there is provided a time information acquiring apparatus for receiving a broadcast wave of digital terrestrial broadcasting and acquiring time information contained in the broadcast wave, wherein an antenna for receiving the broadcast wave and a set channel are selected. a broadcast wave signal receiving unit that demodulates the radio signal using a receiver, measures the radio quality, and extracts time information; When searching for the information generation unit and the time information acquisition channel for extracting time information, all channels of digital terrestrial broadcasting waves are sequentially set to the broadcast wave signal reception unit, and the radio quality of the set channels is acquired. A time information acquisition device comprising a broadcast wave signal control unit that stores a channel having the best radio quality among all channels and sets the channel with the best radio quality as a time information acquisition channel in a broadcast wave signal reception unit to select the channel. Therefore, it is possible to output the broadcast wave time information for generating the synchronization signal at low cost regardless of whether it is indoors or outdoors. A channel can be selected as a time information acquisition channel, and there is an effect that time information of broadcast waves can be acquired quickly and reliably.

Further, according to the present invention, when the broadcast wave signal control unit searches for the time information acquisition channel, before searching all the channels, the preset first channel is designated as the designated channel, and the broadcast wave signal Set in the receiving unit, acquire the radio quality of the first channel, and when the radio quality of the first channel is equal to or higher than a specific quality, receive the broadcast wave signal with the first channel as the time information acquisition channel Since the time information acquisition device is set in the unit to select a channel, the user may, for example, recognize a channel broadcast in the area where the device is installed in advance as a channel to be set in advance, or When a channel with good radio quality is recognized, setting that channel as a designated channel has the effect of enabling the time information acquisition channel to be selected quickly and efficiently with a simple process.

Further, according to the present invention, when searching for a time information acquisition channel, the broadcast wave signal control unit sets a preset second channel as a priority channel in the broadcast wave signal reception unit, and selects the second channel. When the radio quality of the second channel is equal to or higher than the specific quality, the second channel is set as the time information acquisition channel in the broadcast wave signal receiving unit and selected, If the radio quality of the second channel is less than a specific quality, the channel with the best radio quality in the search of all channels is set in the broadcast wave signal receiver as the time information acquisition channel and selected. Since the above time information acquisition device is used, even if the radio quality of the set priority channel is not good, there is an effect that a channel with good radio quality can be reliably selected by searching for all channels. .

Further, according to the present invention, the broadcast wave signal control unit periodically acquires the radio quality of the time information acquisition channel selected by the broadcast wave signal receiving unit and determines whether the quality is equal to or higher than a specific quality. , If the radio quality is equal to or higher than a specific quality, the broadcast wave signal receiving unit continues to select the channel, and if the radio quality is lower than the specific quality, a process of searching for another time information acquisition channel. Therefore, when the radio quality of the currently set time information acquisition channel deteriorates, it is possible to immediately search for and set another channel, and the channel always has good radio quality. There is an effect that the time information can be reliably acquired from the

According to the present invention, there is provided a synchronizing signal conversion device including any one of the time information acquiring devices described above and a synchronizing signal generating unit that generates a synchronizing signal based on the broadcast wave time information from the time information acquiring device. Therefore, there is an effect that the search range of the time information acquisition channel can be appropriately changed according to user settings, time information can be efficiently and reliably acquired from a channel of good radio quality, and a synchronization signal can be generated. .

1 is a schematic configuration diagram of the present time information acquisition device; FIG. 1 is a schematic configuration diagram of this synchronization signal conversion device; FIG. 4 is a flowchart showing an overview of TOT search processing; 4 is a flowchart of designated channel search processing. 4 is a flowchart of all-channel search processing (1); 10 is a flowchart of all-channel search processing (2); 4 is a flowchart of priority channel search processing; 4 is a flowchart of TOT acquisition channel monitoring processing;

An embodiment of the present invention will be described with reference to the drawings.
[Outline of Embodiment]
A time information acquisition device (this time information acquisition device) according to an embodiment of the present invention is a one-segment broadcasting (one-segment) channel that acquires a TOT (Time Offset Table) as time information from digital terrestrial broadcasting channels. (TOT acquisition channel), the channel is searched by the search method selected according to the user's setting, and the wireless quality of One Seg (for example, C / N (carrier-to-noise ratio)) is the set value The above channels are selected (tuned) as TOT acquisition channels to generate broadcast wave time information. Channels can be detected and selected by automatic processing even without the device, and by appropriately changing the search range according to user settings, it is possible to efficiently and reliably select an appropriate TOT acquisition channel. .

Further, the synchronization signal conversion device (the synchronization signal conversion device) according to the embodiment of the present invention includes the time information acquisition device, and generates the synchronization signal using the broadcast wave time information from the time information acquisition device. It is something to do.

[Configuration of this time information acquisition device: Fig. 1]
The configuration of this time information acquisition device will be described with reference to FIG. FIG. 1 is a schematic configuration diagram of this time information acquisition device.
As shown in FIG. 1, the time information acquisition device 10 includes antennas 11 and 12, a broadcast wave signal receiver 13, a broadcast wave time information generator (described as a time information generator in the figure) 14, and a broadcast wave A signal control unit 15 is provided, and the generated synchronization time information is output to the synchronization signal conversion device 20 .

Each part of the time information acquisition device 10 will be described.
Antennas 11 and 12 receive broadcast waves of terrestrial digital broadcasting. Although two antennas are provided here in order to obtain a spatial diversity effect, only one of them may be provided.
The broadcast wave signal receiver 13 receives and demodulates the broadcast wave signal, extracts the TOT multiplexed in the broadcast signal, and outputs it to the broadcast wave time information generator 14 .
At that time, the broadcast wave signal receiving unit 13 selects a channel designated by the broadcast wave signal control unit 15 and demodulates it.
In addition, the broadcast wave signal receiving unit 13 broadcasts whether or not the selected channel can be received, the C/N measurement result of One Seg, and the reception result of One Seg packets (number of received One Seg packets, number of One Seg packet errors). The signal is output to the wave signal control unit 15 .

The broadcast wave time information generating unit 14 converts the TOT input from the broadcast wave signal receiving unit 13 into broadcast wave time information in a format that can be used to generate a synchronizing signal in a subsequent synchronizing signal conversion device, and outputs the information. processing unit.
The broadcast wave signal control unit 15 is a characteristic part of this time information acquisition device, performs processing for searching for a channel for acquiring TOT, and designates the selected channel to the broadcast wave signal reception unit 13 as a TOT acquisition channel.

The broadcast wave signal control unit 15 is basically an arithmetic processing unit including a control unit, a storage unit, and an interface unit. Realize. Processing of the broadcast wave signal control unit 15 will be described later.

In the time information acquisition device 10, before the actual operation is started, the broadcast wave signal control unit 15 searches for the channel of the broadcast wave and selects the TOT acquisition channel, and acquires the TOT of the selected channel. It is set in the broadcast wave signal receiving section 13 as a channel.

During operation, the broadcast waves received by the antennas 11 and 12 are input to the broadcast wave signal receiving unit 13, and the TOT acquisition channel specified by the broadcast wave signal control unit 15 is selected in the broadcast wave signal receiving unit 13. After being modulated and demodulated, the TOT is extracted, and the broadcast wave time information is generated by the broadcast wave time information generating section 14 and output to the synchronizing signal conversion device 20 at the subsequent stage.
The synchronizing signal converter 20 generates a synchronizing signal synchronized with UTC (Coordinated Universal Time) based on the broadcast wave time information and provides it to the system.
As a result, the synchronization signal can be generated using the time information from the broadcast wave without increasing the equipment cost, and the synchronization signal can be generated even indoors or underground.

[Configuration of this synchronization signal conversion device: Fig. 2]
The configuration of this sync signal conversion device will be described with reference to FIG. FIG. 2 is a schematic block diagram of this synchronization signal conversion device.
As shown in FIG. 2, the synchronization signal conversion device 21 includes the time information acquisition device 10 shown in FIG.
The synchronization signal generator 16 has the same function as the synchronization signal conversion device 20 shown in FIG. 1, and uses the broadcast wave time information output from the time information generator 14 to generate a synchronization signal synchronized with UTC. , to be supplied externally.
The operation of generating the synchronization signal in the synchronization signal generator 16 may be the same as the operation of the synchronization signal conversion device described in Patent Document 1 or 2, for example.

[Overview of TOT acquisition channel search processing: Fig. 3]
In the broadcast wave signal control unit 15 of the time information acquisition device 10, a search method (search mode) is selected by a user's input operation from the outside, and the contents of the TOT acquisition channel search process are changed in three ways accordingly. I'm trying
The three types of search processing are designated channel search processing, priority channel search processing, and all channel search processing, and the TOT acquisition channel is selected by any of the search processing. Each search process will be described later.
In either search process, a TOT acquisition channel with good radio quality can be selected more quickly and reliably than when the user manually searches for a good channel.

An overview of the TOT acquisition channel search processing will be described with reference to FIG. FIG. 3 is a flowchart showing an outline of TOT search processing.
As shown in FIG. 3, the broadcast wave signal control unit 15 starts processing when a search start instruction is input from the outside. keep it. The user issues an instruction to start searching, and designates a designated channel and a priority channel. It should be noted that, in processing S11, the designated channel and the priority channel may not be input.

The specified channel is a channel that is the first candidate for the TOT acquisition channel arbitrarily specified by the user. It is a channel or the like that has a track record of obtaining quality. The designated channel corresponds to the first channel described in the claims.
The priority channel is the next candidate channel when the designated channel cannot be set as the TOT acquisition channel. The priority channel is the claimed second channel.

The broadcast wave signal control unit 15 first determines whether or not the designated channel number designated in step S11 is within a predetermined range (S12). "Within a predetermined range" means the range of all digital terrestrial broadcasting channels, and the channel numbers are from 13 to 52 (13 to 52).
If the specified channel number is within the range of 13 to 52 in process S12 (Yes), the broadcast wave signal control unit 15 executes the specified channel search process (S13), and ends the process. Details of the designated channel search processing will be described later.

In processing S12, if the designated channel number is out of the predetermined range or is not designated (if No), the broadcast wave signal control unit 15 checks whether the priority channel number is within the range of 13 to 53. Determine (S14).

In processing S14, if the priority channel number is within the predetermined range (Yes), the broadcast wave signal control unit 15 executes priority channel search processing (S15), and ends the processing. The details of the priority channel search process will be described later.

In the process S14, if the priority channel number is out of the predetermined range or the priority channel number is not specified (No), the broadcast wave signal control unit 15 executes all channel search process (S16), Finish processing. Details of the all-channel search process will be described later.
In this way, one of three types of search processing is performed.

[Specified channel search processing: FIG. 4]
Next, the designated channel search processing shown in processing S13 in FIG. 3 will be described using FIG. FIG. 4 is a flow chart of designated channel search processing.
In the processing S12 of FIG. 3, when the designated designated channel number is within the range, the designated channel search processing is started.
The designated channel search process confirms whether or not the radio quality of only a specific designated channel designated by the user is sufficient as a TOT acquisition channel, and if sufficient quality is obtained, the designated channel is selected as a TOT acquisition channel. It is a process to be controlled.

When the designated channel search process is started, as shown in FIG. 4, the broadcast wave signal control unit 15 first sets the designated channel number designated in the process S11 of FIG. 3 as the channel number to be searched (S21). , instructs the channel number to the broadcast wave signal receiving unit 13 to select the channel (S22). Thereby, the broadcast wave signal receiving unit 13 receives the specified channel specified by the user.

Then, the broadcast wave signal receiving unit 13 determines whether or not the selected channel is receivable, and the broadcast wave signal control unit 15 acquires information on whether reception is possible (S23).
The broadcast wave signal control unit 15 determines whether or not the information on whether or not the information can be received is receivable (S24). S25).

The broadcast wave signal control unit 15 determines whether or not the one-segment C/N obtained in processing S25 is equal to or higher than the threshold (S26), and if it is equal to or higher than the threshold, the designated channel is designated as the TOT acquisition channel. (S27). The threshold corresponds to a specific quality recited in the claims.

Then, the broadcast wave signal control unit 15 instructs the broadcast wave signal receiving unit 13 to designate the designated channel number as the TOT acquisition channel number (S28), sets the number of errors to "0" (S29), and ends the process. The number of errors is used in monitoring processing, which will be described later.

In addition, if the information on reception propriety is unreceivable in process S24 (No), and if the 1seg C/N is less than the threshold value in process S26 (No), the process ends. .
In other words, even if the designated channel is designated by the user, if the radio quality is not good, the channel is not selected as the TOT acquisition channel.
In this manner, the designated channel search processing is performed.

When the user already recognizes the channel number suitable for the TOT acquisition channel, the TOT acquisition channel can be easily found by setting the channel number as the designated channel and executing the designated channel search processing. Tuning is possible and efficient.

If the TOT acquisition channel is not selected in the designated channel search processing, the user designates another designated channel to cause the designated channel search processing to be performed again, or to perform all channel search processing or priority channel search processing, which will be described later. can be done.
Also, in the designated channel search processing, if the designated channel is not receivable in processing S24, and if the one-segment C/N of the designated channel is not equal to or greater than the threshold value in processing S26, the processing is not terminated as it is. , it may be configured to shift to a priority channel search process (FIG. 7) to be described later.

[All channel search processing: FIGS. 5 and 6]
Next, the all-channel search processing shown in FIG. 3 will be described with reference to FIGS. 5 and 6. FIG. FIG. 5 is a flowchart of all-channel search processing (1), and FIG. 6 is a flowchart of all-channel search processing (2). The processes in FIGS. 5 and 6 are continuously performed, and the entire process combining the processes in FIGS. 5 and 6 is called an all-channel search process.

The all-channel search process is started when both the specified channel and the priority channel are out of range or not specified in the process of FIG. It is a process of

When the all-channel search process is started, as shown in FIG. 5, the broadcast wave signal control unit 15 sets the channel number to be searched to 13 (S31), and instructs the broadcast wave signal receiving unit 13 to channel number 13. to select a channel (S32). As described above, channel numbers 13 to 52 are the channel range of digital terrestrial broadcasting.

When the broadcast wave signal receiving unit 13 selects a channel, determines whether or not the channel is receivable, and information on whether or not reception is possible is sent, the broadcast wave signal control unit 15 acquires the information on whether or not reception is possible ( S33), it is determined whether reception is possible (S34).

In process S34, if the selected channel is receivable (if Yes), the broadcast wave signal control unit 15 stores the number as a receivable channel number, and acquires the 1seg C/N of the channel. (S35), and stored in association with the channel number.

Then, the broadcast wave signal control unit 15 adds 1 to the channel number (S36), and determines whether the channel number is 53 or more (S37).
If the selected channel cannot be received in step S34, the process proceeds to step S36.

If the channel number is less than 53 in process S37 (if No), the broadcast wave signal control unit 15 proceeds to process S32 and performs the same process for the next channel.
If the channel number is 53 or more in the process S37 (if Yes), it means that all the channels used in terrestrial digital broadcasting have been checked for reception availability, and all channel search process (2) in FIG. (A).

When the process 37 in FIG. 5 shifts to (A), the broadcast wave signal control unit 15 determines whether there is a receivable channel as shown in FIG. It is determined whether there is a channel stored as a possible channel (S38), and if there is no receivable channel (No), the process ends.

In addition, when the receivable channels are stored in the process S38 (if Yes), the broadcast wave signal control unit 15 selects one of the receivable channels based on the stored one-seg C/N information , determines whether there is a channel whose one-segment C/N is above the threshold value (S39), and if there is no channel above the threshold value (if No), the process ends.

In the process S39, if there is a channel whose 1seg C/N is equal to or higher than the threshold value (if Yes), the broadcast wave signal control unit 15 selects the channel with the maximum 1seg C/N among them. is set as the TOT acquisition channel (S40).
Then, the broadcast wave signal control unit 15 instructs the TOT acquisition channel number to the broadcast wave signal receiving unit 13 (S41), sets the number of errors to "0", and ends the process.
In this manner, all channel search processing is performed.

Even if the user does not recognize the appropriate channel as the TOT acquisition channel, by performing all channel search processing, it is possible to select the channel with the best radio quality from all the channels, ensuring TOT. It is something that can be obtained.

[Priority channel search processing: FIG. 7]
Next, the priority channel search processing shown in FIG. 3 will be explained using FIG. FIG. 7 is a flowchart of priority channel search processing.
The priority channel search process is started when the designated channel number is out of the search range and the priority channel number is within the range in the process of FIG. , a priority channel as the next candidate, or a different channel with good radio quality as a TOT acquisition channel.

As shown in FIG. 7, the broadcast wave signal control unit 15 first executes processes S31 to S37 as the all-channel search process (1) shown in FIG. 5 (S51).
Then, the broadcast wave signal control unit 15 determines whether or not there is a receivable channel (S52), and if there is no receivable channel (No), the process ends.

If there is a receivable channel in the process S52 (Yes), the broadcast wave signal control unit 15 determines that there is a channel with a one-segment C/N equal to or higher than the threshold among the receivable channels. It is judged whether or not there is (S53), and if there is no channel exceeding the threshold value (if No), the process ends.

In processing S53, if there is a channel whose One-segment C/N is equal to or greater than the threshold value (if Yes), the broadcast wave signal control unit 15 controls the one-segment channel of the priority channel designated in processing S11 of FIG. It is determined whether the C/N is less than the threshold (S54).

In the process S54, if the 1seg C/N of the priority channel is not less than the threshold value (if No), the radio quality of the priority channel is determined to be good, and the priority channel is set as the TOT acquisition channel (S55), The TOT acquisition channel number is instructed to the broadcast wave signal receiving unit 13 (S57).

In addition, when the one-segment C/N of the priority channel is less than the threshold value in the process S54 (if Yes), the broadcast wave signal control unit 15 determines that one-segment C/N among the stored channels The maximum channel is set as the TOT acquisition channel (S56), and the process proceeds to S57.
Then, the broadcast wave signal control unit 15 sets the number of errors to "0", and ends the process.
In this way, priority channel search processing is performed.

In the priority channel search process, even if the radio quality of the priority channel is not good, another channel with good radio quality can be selected as the TOT acquisition channel, and the TOT can be acquired reliably.

In the processing of FIG. 7, all channels are searched first, and then the one-segment C/N of the priority channel is checked. Check whether reception is possible and whether the one-segment C/N is good. If the one-segment C/N is good, set it as a TOT acquisition channel as it is, and if the priority channel is unqualified, search for all channels. You may do so.

[TOT acquisition channel monitoring process: FIG. 8]
Even when a TOT acquisition channel is selected and operated, the broadcast wave signal control unit 15 periodically checks the radio quality of the TOT acquisition channel in order to determine whether or not to continue acquiring TOT on that channel. A TOT acquisition channel monitoring process is performed for monitoring (for example, in a cycle of 1 second).

The TOT acquisition channel monitoring process will be described with reference to FIG. FIG. 8 is a flow chart of the TOT acquisition channel monitoring process.
As shown in FIG. 8, when the TOT acquisition channel monitoring process is started, the broadcast wave signal control unit 15 acquires the number of One-Seg packets and the number of One-Seg packet errors from the broadcast wave signal reception unit 13 (S61).

Then, the broadcast wave signal control unit 15 determines whether or not the number of received One-Seg packets is 1 or more (S62). 1 is added to the current error count, the process proceeds to step S66, and it is determined whether the error count is less than a predetermined threshold value (S66).

For example, 300 times is set as the threshold for the number of errors. This corresponds to the number of errors reached when the poor reception condition continues for 5 minutes when the TOT acquisition channel monitoring process is performed at a cycle of 1 second.

If the number of One-Seg packets is 1 or more in step S62 (Yes), the broadcast wave signal control unit 15 determines whether or not the number of One-Seg packet errors is 0 (S63). That is, when the number of errors is 1 or more, the process proceeds to step S65 and adds 1 to the number of errors (S65).

If the number of one-segment packet errors is 0 in step S63 (Yes), the broadcast wave signal control unit 15 sets the number of errors to 0 (S64), and proceeds to step S66.
In other words, even if a one-segment packet cannot be received due to a sudden failure or a packet error occurs, if the state does not continue and the state returns to a good state within a certain period of time (for example, within 5 minutes), The error count is reset.
As a result, it is possible to prevent the process of frequently changing the TOT acquisition channel by overreacting to a sudden malfunction.

Then, the broadcast wave signal control unit 15 determines whether or not the number of errors is less than the threshold value (S66). Since the radio quality of the channel is not good, the processing of FIG. 3 is returned to and the TOT acquisition channel is searched again (S67).
If the number of errors is less than the threshold in step S66, the process ends.
Thus, the TOT acquisition channel monitoring process is performed.

By the TOT acquisition channel monitoring process, a channel of good radio quality can always be set as the TOT acquisition channel, and the TOT can be reliably acquired.

[Effects of Embodiment]
According to the time information acquisition device 10, when the broadcast wave signal control unit 15 selects a TOT acquisition channel from digital terrestrial broadcasting channels, to select one of designated channel search processing, priority channel search processing, and all channel search processing, and by the selected search processing, a channel whose C/N of one segment is equal to or higher than the threshold value is selected as a TOT acquisition channel and broadcasted. is designated to the wave signal receiving unit 13, the broadcast wave signal receiving unit 13 receives the TOT acquisition channel, extracts the TOT, and the broadcast wave time information generating unit 14 generates broadcast wave time information based on the TOT. Therefore, it is possible to output broadcast wave time information for generating a synchronization signal at a low cost regardless of whether it is indoors or outdoors, detect a channel by automatic processing without searching for a channel manually, and select a channel By appropriately changing the search range according to user settings, there is an effect that an appropriate TOT acquisition channel can be efficiently selected.

In particular, when the user recognizes in advance the channel being broadcast in the area where the device is installed, or in the case where the user recognizes in advance a channel with good radio quality, the channel may be designated as a designated channel or a priority channel. , the broadcast wave signal control unit 15 can perform designated channel search processing and priority channel search processing, and can quickly set an appropriate TOT acquisition channel with simple processing.

In addition, if the user does not know in advance the channel being broadcast in the area where the device is installed or does not know the channel with good radio quality, by not setting the designated channel and the priority channel, the broadcast wave There is an effect that the signal control unit 15 can perform all-channel search processing and can reliably set a channel with good radio quality as a TOT acquisition channel.

Further, according to the synchronization signal conversion device 21, since it is provided with the time information acquisition device 10 and the synchronization signal generation unit 16, it is possible to generate the synchronization signal based on the broadcast wave time information, and at a low cost. In addition, it is possible to generate a synchronization signal regardless of whether it is indoors or outdoors, and to efficiently select an appropriate TOT acquisition channel.

Further, according to the time information acquisition device 10 and the synchronization signal conversion device 21, the broadcast wave signal control unit 15 periodically performs TOT acquisition channel monitoring processing for monitoring the radio quality of the TOT acquisition channel. Therefore, when the radio quality of the currently set TOT acquisition channel deteriorates, it is possible to immediately search for another channel and set it as the TOT acquisition channel, which has the effect of reliably acquiring the TOT. .

This application claims the benefit of priority based on Japanese Patent Application No. 2020-045986 filed on March 17, 2020, the entire disclosure of which is incorporated herein by reference.

INDUSTRIAL APPLICABILITY The present invention is a time information acquiring apparatus capable of generating a synchronization signal at low cost regardless of whether indoors or outdoors, and particularly capable of efficiently selecting a channel with good radio quality from broadcast waves and acquiring time information. and synchronization signal converters.

DESCRIPTION OF SYMBOLS 10... Time information acquisition apparatus 11, 12... Antenna 13... Broadcast wave signal receiver 14... Time information generation part 15... Broadcast wave signal control part 16... Synchronization signal generation part 20, 21... Synchronization signal conversion Device

Claims (5)

A time information acquisition device for receiving a broadcast wave of digital terrestrial broadcasting and acquiring time information contained in the broadcast wave,
An antenna for receiving the broadcast wave;
a broadcast wave signal receiver that tunes to and demodulates the set channel, measures radio quality, and extracts the time information;
a broadcast wave time information generation unit that generates and outputs broadcast wave time information that can be converted into a synchronization signal based on the extracted time information;
When searching for a time information acquisition channel for extracting the time information, while sequentially setting all channels of digital terrestrial broadcasting waves to the broadcast wave signal receiving unit, the radio quality of the set channels is acquired and stored. and a broadcast wave signal control unit for setting the channel with the best radio quality among all the channels as the time information acquisition channel to the broadcast wave signal receiving unit and selecting the channel. A time information acquisition device characterized by: When searching for the time information acquisition channel, the broadcast wave signal control unit sets a preset first channel as a designated channel in the broadcast wave signal receiving unit before searching for all channels, and acquire the radio quality of one channel, and if the radio quality of the first channel is equal to or higher than a specific quality, set the first channel as the time information acquisition channel in the broadcast wave signal receiving unit; 2. The time information acquisition device according to claim 1, wherein the channel is selected by pressing the time information acquisition device. When searching for a time information acquisition channel, the broadcast wave signal control unit sets a preset second channel as a priority channel in the broadcast wave signal reception unit, and acquires the radio quality of the second channel. , when the radio quality of the second channel is equal to or higher than a specific quality, the second channel is set as the time information acquisition channel in the broadcast wave signal receiving unit and selected, and the second channel is selected If the radio quality of the channel is less than the specific quality, the channel with the best radio quality in the search of all channels is set in the broadcast wave signal receiving unit as the time information acquisition channel and selected. 2. The time information acquisition device according to claim 1, wherein The broadcast wave signal control unit periodically acquires the radio quality of the time information acquisition channel selected by the broadcast wave signal receiving unit, determines whether the radio quality is equal to or higher than a specific quality, and determines whether the radio quality is equal to or exceeds the specific quality. If the quality is equal to or higher than the quality, the broadcast wave signal receiving unit continues to select the channel, and if the radio quality is lower than the specific quality, a process of searching for another time information acquisition channel is performed. 4. The time information acquisition device according to any one of claims 1 to 3 . a time information acquisition device according to any one of claims 1 to 4 ;
A synchronization signal conversion device, comprising: a synchronization signal generation unit that generates a synchronization signal based on the broadcast wave time information from the time information acquisition device.

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