JP7554638B2 - Internet radio position detection device and Internet radio position detection program - Google Patents

Description

The present invention relates to an internet radio location detection device and internet radio location detection program that detect the area in which a user is currently located when playing internet radio.

Recently, Internet radio services that distribute audio over the Internet, rather than broadcast radio, have been launched. For example, radiko (registered trademark: see Non-Patent Document 1) is an Internet radio service.
The simultaneous distribution of Internet radio and television broadcasts, which has recently become available, is not only expected to increase the number of viewers, but also complements broadcast waves, as it can be used when there is a lot of noise or when it is difficult to directly receive broadcast waves, such as indoors or in a tunnel while traveling. For this reason, a technology has been proposed for devices capable of receiving broadcasts, Internet radio, and Internet television, which select the one with the best reception environment so as not to impair the viewing experience (for example, see Patent Document 1).

In particular, for broadcast receiving devices in mobile objects such as car-mounted radios and television viewing devices, the reception environment changes as the device moves, so various technologies have been developed to maintain the reception conditions. For example, in addition to providing mobile objects with the auto search functions used in fixed radios (see Patent Document 2) and the channel search functions used in fixed televisions (see Patent Document 3), methods have been proposed for receiving and reproducing radio waves from broadcast stations with better reception environments using location information using GPS (Global Positioning System) and information on the service areas of broadcast stations and relay stations.

Meanwhile, as mentioned above, Internet radio services are distributed as a complement to broadcasting. Therefore, just as there are restrictions on the broadcasting area for each broadcast, the area of distribution via the Internet may be limited depending on the broadcasting area. Various solutions have been proposed to the problem of limiting the service area for Internet radio and Internet television. For example, in Patent Document 4, GPS is used to detect the area distributed via the Internet. In Patent Document 5, only Internet broadcasting stations that distribute the same programs as the broadcasting station being received via broadcast can be played. In Patent Document 6, the area is detected using base station information from a PHS (Personal Handy phone System). Also, the Internet radio service radiko uses a method of area detection that uses GPS and IP addresses.

JP 2013-077985 A Japanese Unexamined Patent Publication No. 54-104701 JP 2004-179928 A JP 2008-182604 A JP 2005-136879 A JP 2008-288814 A

radiko, [online], radiko Inc., [searched on November 2, 2020], Internet <URL: http://radiko.jp/>

As mentioned above, some Internet radios, which are intended to complement broadcasts, detect service area information and restrict viewing to services that correspond to that area. However, the method using GPS described in Patent Document 4 cannot be used if the viewing device cannot grasp the location information from the GPS. The method described in Patent Document 5, which reproduces only Internet broadcast stations that distribute the same programs as the broadcast station received by broadcast, requires the viewing device to receive the broadcast at least once in a good reception environment. Furthermore, the method using PHS base stations described in Patent Document 6 cannot be used if the viewing device does not have the function to receive PHS. In area detection using IP addresses, some providers may have a set range of IP addresses assigned to each prefecture, but this is not always the case, and it may not be possible to correctly determine the area from the IP address.

The present invention has been made in consideration of the above points, and aims to provide an Internet radio location detection device and an Internet radio location detection program that can detect the area required to play Internet radio even when a device does not have a current location detection function such as GPS.

To solve the above problem, the Internet radio position detection device of the present invention is configured to include a broadcast receiving antenna, a demodulation unit, a first corresponding area information generating unit, a second corresponding area information generating unit, an area determination unit, and an Internet radio receiving unit.

With this configuration, the Internet radio position detection device receives radio waves of at least one of analog radio broadcasting and terrestrial digital broadcasting including OneSeg broadcasting using the broadcast receiving antenna, and when a terrestrial digital broadcasting signal is acquired using the demodulation unit, it searches for the terrestrial digital broadcasting and extracts a service ID that identifies the broadcasting service from the NIT (Network Information Table) of the detected signal to generate a receiving NIT list, and when an analog radio broadcasting signal is acquired, it searches for frequencies in the radio broadcasting, extracts high frequencies in the receiving electric field, and generates a receiving frequency list.
This enables the Internet radio position detection device to generate a receiving NIT list and a receiving frequency list from the broadcast radio waves.

Furthermore, the Internet radio position detection device refers to the NIT database in which information on the service area of the broadcast service associated with the service ID is stored, compares the service ID indicated in the generated reception NIT list with each service ID in each area indicated in the service area of the NIT database, calculates the coincidence rate of the broadcast service indicated by the service ID in each area as the coincidence rate, and generates the first corresponding area information. Also, the second corresponding area information generation unit refers to the frequency database in which information on the service area of the broadcast service associated with the frequency of analog radio broadcast is stored, compares each frequency indicated in the generated reception frequency list with the frequency indicated in the frequency database, extracts an area of the matching frequency, calculates the coincidence rate of the broadcast service indicated by the frequency in the extracted area as the coincidence rate, and generates the second corresponding area information. Then, the area determination unit refers to the first corresponding area information generated using the reception NIT list or the second corresponding area information generated using the reception frequency list, and can detect the area with the highest coincidence rate as the area in which the Internet radio position detection device itself is located.
This makes it possible for an Internet radio location detection device to detect the area in which it is located, even if it does not have a current location detection function such as GPS, by using relevant area information generated using a reception NIT list or reception frequency list generated from broadcast radio waves.

Furthermore, the Internet radio position detection device can receive, via the Internet, information on Internet radio that is receivable as a broadcast service according to the area detected by the area detection unit, by the Internet radio receiving unit.
This enables the Internet radio position detection device to properly receive Internet radio signals that are receivable in the area in which it is located, even if distribution of Internet radio signals is restricted depending on the broadcast area.

The present invention provides an Internet radio location detection device and an Internet radio location detection program that detect the area required to play Internet radio when a device does not have a current location detection function such as GPS.

1 is a functional block diagram showing a configuration of an Internet radio position detection device according to an embodiment of the present invention. FIG. 2 is a functional block diagram showing the configuration of a demodulation unit of the Internet radio position detection device according to the embodiment. FIG. 11 is a diagram showing an example of a reception NIT list according to the embodiment. FIG. 4 is a diagram showing an example of a receiving frequency list according to the embodiment. 2 is a functional block diagram showing the configuration of an area detection unit of the Internet radio position detection device according to the embodiment; FIG. FIG. 2 is a diagram illustrating an example of an NIT database according to the embodiment. FIG. 11 is a diagram showing an example of relevant area information according to the embodiment; FIG. 4 is a diagram showing an example of a frequency database according to the embodiment; FIG. 11 is a diagram showing an example of relevant area information according to the embodiment; 5 is a flowchart showing a process flow of the Internet radio position detection device according to the embodiment. 5 is a flowchart showing the flow of area detection processing executed by an area detection unit of the Internet radio position detection device according to the embodiment.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, modes for carrying out the present invention (hereinafter, referred to as "embodiments") will be described with reference to the drawings.
The Internet radio location detection device 1 (see FIG. 1) according to the present invention is a device that does not have a function for detecting the current location such as GPS, and is a device that can receive broadcast waves and Internet radio. The Internet radio location detection device 1 detects the area in which the Internet radio location detection device 1 is currently located from information obtained from the broadcast waves, and enables listening to the Internet radio corresponding to that area.
The Internet radio position detection device 1 according to this embodiment can be configured as an Internet radio receiving device that can listen to Internet radio by detecting its own current location.

In this embodiment, the listener is, for example, a person who wants to listen to the radio in a reinforced concrete building in a residential area, and although the area is within the target broadcast area, the reception environment is poor, so the listener wishes to listen to the Internet radio. When listening to the Internet radio, for example, when using a service that aims to replace broadcasting, such as that described in Non-Patent Document 1, it is necessary to detect the location of the Internet radio receiving device at the listener's location, identify the service area, and make it possible to receive only broadcast stations that can be received by broadcast. Therefore, the Internet radio position detection device 1 according to this embodiment receives broadcast radio waves, and detects the broadcast service area of the Internet radio position detection device 1 by using some of the digital information of the broadcast radio waves (information in the "NIT (Network Information Table)" described later) or information on the high frequency band of the received electric field.

<Configuration of Internet Radio Position Detection Device>
The Internet radio position detection device 1 according to this embodiment is realized by a computer having a control means, an input/output means, and a storage means, etc. Specifically, as shown in Fig. 1, the Internet radio position detection device 1 includes a broadcast receiving antenna 10, a demodulation unit 20, an area detection unit 30, an Internet radio receiving unit 40, a communication transmitting/receiving unit 50, and an audio reproducing unit 60.
The storage means of the Internet radio position detection device 1 is composed of a flash memory, a hard disk, a RAM (Random Access Memory), etc., and stores programs (Internet radio position detection programs) for executing processing by each of the functional units described above.

The broadcast receiving antenna 10 is an antenna capable of receiving at least one frequency band of broadcast waves such as AM radio, FM radio, and One Seg (digital terrestrial broadcast).
The demodulation unit 20 demodulates the radio waves received by the broadcast receiving antenna 10. Specifically, when the demodulation unit 20 receives a digitally modulated broadcast, it outputs area-related information (the "reception NIT list" described below) from the demodulation result. When the demodulation unit 20 receives an analog-modulated broadcast, it outputs a list of frequencies with high reception electric fields (the "reception frequency list" described below). Details will be described later with reference to FIG. 2.

The area detection unit 30 detects the area in which the Internet radio position detection device 1 is located from the area-related information (reception NIT list) or reception frequency list output from the demodulation unit 20. Details will be described later with reference to FIG. 5.

The Internet radio receiving unit 40 connects to the Internet radio distribution station via the communication transmitting/receiving unit 50 based on the area detected by the area detection unit 30, and receives the Internet radio of the selected radio station based on the radio distribution station selection information input by the listener via an input means (not shown).

The communication transmitting/receiving unit 50 is configured with a NIC (Network Interface Card) that controls Internet communications, etc. The communication transmitting/receiving unit 50 receives Internet radio audio information from each radio station as packets via the Internet.
The audio reproduction unit 60 is mainly composed of a speaker, and reproduces the audio signal received by the Internet radio receiving unit 40 .

Demodulation section
Next, a detailed configuration of the demodulation unit 20 of the Internet radio position detection device 1 will be described with reference to FIG.
The demodulation section 20 includes a digital demodulation section 21 that processes signals of terrestrial digital broadcasting including one-segment broadcasting, and an analog demodulation section 22 that processes analog-modulated signals.

A signal in the frequency band of the terrestrial digital broadcast signal received by the broadcast receiving antenna 10 is input to the digital demodulation unit 21. The digital demodulation unit 21 has a function of performing a channel search for terrestrial digital broadcast as shown in, for example, Patent Document 3, extracts an NIT (Network Information Table) from a TS (Transport Stream) signal included in the received signal, and outputs it as a list (received NIT list).
The NIT includes a service ID for identifying a broadcast service. The digital demodulation unit 21 generates a received NIT list 210 including information on each service ID, as shown in FIG. 3, from the input digital terrestrial broadcast signal (TS signal).

The Internet radio position detection device 1 of this embodiment uses terrestrial digital broadcasting only for area detection and does not reproduce video or audio, so by targeting reception of OneSeg broadcasting, which has high error correction capabilities, it can be configured to be resistant to noise.
When the reception state is poor and there is no radio wave of the demodulated frequency, the digital demodulation unit 21 outputs an empty reception NIT list 210.

The analog demodulation unit 22 demodulates the received radio wave into an analog modulated radio wave. The analog demodulation unit 22 has a function of performing an automatic search of radio frequencies as shown in, for example, Patent Document 2, and outputs a list of received frequencies (a receiving frequency list).
The analog demodulation unit 22 generates a receiving frequency list 220, for example, as shown in FIG. 4, which is made up of information on each frequency with a strong received electric field.

Since the analog demodulation section 22 only needs to be able to output high frequencies of the received electric field, it can also perform an automatic search on frequency bands within the range of terrestrial digital broadcasting, which is normally digitally modulated.
When the reception state is poor and there is no radio wave of a frequency that can be demodulated, the analog demodulation unit 22 outputs an empty receiving frequency list 220.

<Area detection section>
Next, the detailed configuration of the area detection unit 30 of the Internet radio position detection device 1 will be described with reference to FIG.
The area detection unit 30 includes a first corresponding area information generation unit 31, a second corresponding area information generation unit 32, an area determination unit 33, an NIT database 310, and a frequency database 320. The NIT database 310 and the frequency database 320 are obtained by the area detection unit 30 from information stored in, for example, a storage means (not shown) in the Internet radio position detection device 1.

When the first relevant area information generating unit 31 acquires the received NIT list 210 (Figure 3) from the demodulation unit 20, it refers to the NIT database 310 (Figure 6) and generates relevant area information 330 (first relevant area information: Figure 7).

6 is a diagram showing an example of the NIT database 310. The NIT database 310 stores information on the service area of a broadcast station in association with a service ID that is a unique identifier linked to the broadcast name (broadcast station).
For example, the service area "Tokyo" is stored in association with the service ID "1024" of the broadcast name "NHK General Tokyo". Also, the service area "Tokyo" is stored in association with the service ID "23608" of the broadcast name "TOKYO MX". Similarly, the service area "Saitama" is stored in association with the service ID "1024" of the broadcast name "NHK General Tokyo". Also, the service area "Saitama" is stored in association with the service ID "29752" of the broadcast name "Teletama".

The first relevant area information generating unit 31 compares the service IDs indicated in the acquired reception NIT list 210 with each service ID in each area (e.g., Tokyo or Saitama) indicated in the service area of the NIT database 310, calculates the matching rate of broadcasting stations (specifically, service IDs) within that area as the matching rate, and generates the relevant area information 330.

For example, assume that the reception NIT list 210 acquired by the first corresponding area information generating unit 31 is as shown in FIG. 3. In this case, the first corresponding area information generating unit 31 compares the service IDs shown in the reception NIT list 210 with each service ID in the NIT database 310 for the service area "Tokyo", and since all service IDs match, including the service ID "23608" of the broadcasting station "TOKYO MX", the corresponding authority rate for the service area "Tokyo" is set to "100(%)". On the other hand, when the first corresponding area information generating unit 31 compares the service IDs in the reception NIT list 210 with each service ID in the NIT database 310 for the service area "Saitama", the service ID "29752" of the broadcasting station "Teletama" does not match, and therefore the corresponding authority rate for the service area "Saitama" is set to "87.5(%)".

The first relevant area information generating unit 31 generates the calculation result of the authority rate of each area as relevant area information 330 (first relevant area information) as shown in FIG.
Then, the first corresponding area information generating unit 31 outputs the generated corresponding area information 330 to the area determining unit 33. Based on the generated corresponding area information 330, the area determining unit 33 detects the area with the highest value of the locality rate as the area where the Internet radio position detection device 1 is located.
In FIG. 7, the area determination unit 33 detects "Tokyo" with an area coverage rate of "100(%)" as the area in which the Internet radio position detection device 1 is located.

Returning to FIG. 5, when the second corresponding area information generating unit 32 acquires the receiving frequency list 220 from the demodulation unit 20, it creates the corresponding area information 330 (FIG. 9) by referring to the frequency database 320 (FIG. 8).

8 is a diagram showing an example of the frequency database 320. The frequency database 320 stores items such as broadcast name, frequency [MHz], service area, and transmission station, and stores information on the frequency of the broadcast name (broadcast station) broadcast from each transmission station and the service area within which the broadcast radio waves of the broadcast station reach.
For example, the broadcast name "NHK-FM" indicates that the broadcast is distributed to the "Tokyo" area from the transmitting station "Tokyo" at a frequency of "82.5 (MHz)." Also, the broadcast name "NHK Tokyo 1" indicates that the broadcast is distributed to the "Kanto" area from the transmitting station "Shobu-Kuki" at a frequency of "0.594 (MHz)."

The second relevant area information generation unit 32 compares the values of each frequency indicated in the acquired receiving frequency list 220 with the frequencies indicated in the frequency database 320, extracts areas where at least one frequency matches, calculates the matching rate of broadcasting stations within that area as the matching rate, and generates relevant area information 330 (second relevant area information).
For example, assume that the receiving frequency list 220 acquired by the second corresponding area information generating unit 32 is as shown in Fig. 4. In this case, the second corresponding area information generating unit 32 extracts the service area for each frequency shown in the receiving frequency list 220 that matches a frequency in the frequency database 320. Here, "Tokyo" and "Kanto" are extracted. Then, the second corresponding area information generating unit 32 calculates the matching rate of broadcasting stations within that area as the matching rate, and generates the corresponding area information 330 (Fig. 9).
Figure 9 shows that the second relevant area information generation unit 32 has generated "Tokyo", whose authority rate is "100 (%)", and "Kanto", whose authority rate is "80 (%)", as relevant area information 330.
Then, the second corresponding area information generating unit 32 outputs the generated corresponding area information 330 to the area determining unit 33. Based on the generated corresponding area information 330 (FIG. 9), the area determining unit 33 detects the area with the highest local area ratio (here, "Tokyo") as the area where the Internet radio position detecting device 1 is located.

However, because AM radio waves propagate over a wide area, it can only identify a wide area such as the Kanto region. However, it is possible to narrow down the area to search the database in advance using the AM radio frequency, and then efficiently detect the area using FM radio or one-segment broadcasting.
Furthermore, since the range of a service area and the range in which broadcasts can be received should essentially be the same, it is possible to specify the area of the broadcast service for each frequency from the detected frequency.

The area determination unit 33 detects the area with the highest locality rate as the area where the Internet radio position detection device 1 is located, based on the relevant area information 330 (first relevant area information) acquired from the first relevant area information generation unit 31 or the relevant area information 330 (second relevant area information) acquired from the second relevant area information generation unit 32. At this time, a predetermined logic is set in advance as to which relevant area information 330 is to be given priority in detecting the area. For example, as shown in FIG. 11 described later, the logic is set to detect the area by giving priority to the relevant area information 330 generated using the reception NIT list 210 over the relevant area information 330 generated using the reception frequency list 220.

The NIT database 310 and the frequency database 320 have been described as being provided within the Internet radio position detection device 1. However, the NIT database 310 and the frequency database 320 may not be provided in the Internet radio position detection device 1, but may be prepared in an external device (server) on the Internet, and may be acquired via the communication transmission/reception unit 50.

<Operation of the Internet Radio Position Detection Device>
Next, the operation executed by the Internet radio position detection device 1 according to the present embodiment will be described with reference to FIG.

First, the Internet radio position detection device 1's broadcast receiving antenna 10 (FIG. 1) receives at least one of the following broadcast radio waves (AM radio, FM radio, One Seg broadcast (terrestrial digital broadcast), etc.) (step S10).

Next, the demodulation unit 20 (FIG. 1) demodulates the received broadcast radio waves and generates the reception NIT list 210 (FIG. 3) and the reception frequency list 220 (FIG. 4) (step S11).
Specifically, the digital demodulation unit 21 (Figure 2) of the demodulation unit 20 performs a channel search on the terrestrial digital broadcast signal received by the broadcast receiving antenna 10, and generates a received NIT list 210 (Figure 3) by extracting the NIT from the TS signal contained in the received signal.
In addition, the analog demodulation section 22 (FIG. 2) of the demodulation unit 20 demodulates the analog-modulated radio waves, performs an automatic search of radio (broadcast radio waves) frequencies, and generates a receiving frequency list 220 (FIG. 4), which is a list of frequencies with high receiving electric fields.

Next, the area detection unit 30 (FIG. 1) detects the area in which the Internet radio position detection device 1 is located based on the reception NIT list 210 or the reception frequency list 220 generated by the demodulation unit 20 (area detection process: step S12). Details of the area detection process of the area detection unit 30 will be described later with reference to FIG. 11.

The Internet radio receiving unit 40 (Fig. 1) connects to the Internet radio distribution station via the communication transmitting/receiving unit 50 (Fig. 1) based on the area detected by the area detecting unit 30, and receives the Internet radio audio information via the Internet (step S13). The received Internet radio audio is then played back by the audio playing unit 60 (Fig. 1).

<Area detection process>
Next, the area detection process executed by the area detection unit 30 (FIG. 1) of the Internet radio position detection device 1 will be described with reference to FIG. 11. Note that this area detection process is the process carried out in step S12 of FIG.

The area detection unit 30 (FIG. 5) acquires the reception NIT list 210 and the reception frequency list 220 from the demodulation unit 20 (step S121).
Then, first, the area detection unit 30 (first corresponding area information generation unit 31) judges whether there is no demodulated radio wave and no service ID is stored in the receiving NIT list 210, that is, whether the receiving NIT list 210 is empty (step S122). If the receiving NIT list 210 is empty (step S122 → Yes), the process proceeds to step S125.
On the other hand, if the service ID is stored in the receiving NIT list 210 and the list is not empty (step S122→No), the process proceeds to the next step S123.

In step S123, the first relevant area information generation unit 31 refers to the NIT database 310 (Figure 6), compares the service ID indicated in the acquired reception NIT list 210 with each service ID in each area indicated by the service area in the NIT database 310, calculates the matching rate of broadcast stations (specifically, service IDs) within that area as the matching rate, and generates relevant area information 330 (first relevant area information: Figure 7).

Then, based on the relevant area information 330, the area determination unit 33 detects the area with the highest localization rate as the area in which the Internet radio position detection device 1 is located (step S124), and ends the process.

On the other hand, in step S122, when the receiving NIT list 210 is empty (step S122→Yes), the area detection unit 30 (second corresponding area information generation unit 32) judges whether the receiving frequency list 220 (FIG. 4) does not store frequency information, that is, whether the receiving frequency list 220 is empty (step S125). If the receiving frequency list 220 is empty (step S125→Yes), the area detection is considered to have failed, and the process is terminated.
On the other hand, if frequency information is stored in the receiving frequency list 220 and the list is not empty (step S125→No), the process proceeds to the next step S126.

In step S126, the second corresponding area information generating unit 32 refers to the frequency database 320 (FIG. 8), compares each frequency indicated in the acquired receiving frequency list 220 with the frequencies in the frequency database 320, and extracts the service areas of matching frequencies. Then, the area determining unit 33 calculates the matching rate of broadcasting stations in the area based on the frequencies of each broadcasting station in the extracted service area and the frequencies indicated in the receiving frequency list 220, as the matching rate, and generates the corresponding area information 330 (second corresponding area information: FIG. 8).

Then, based on the relevant area information 330, the area determination unit 33 detects the area with the highest localization rate as the area in which the Internet radio position detection device 1 is located (step S127), and ends the process.

In this way, with the Internet radio location detection device 1 according to this embodiment, even in the cases shown below, for example, it is possible for an Internet radio receiving device that does not have a current location detection function such as GPS to detect the area in which the Internet radio receiving device is located and to listen to Internet radio.

(Case 1) Assume that you are trying to listen to a radio broadcast in a room in a reinforced concrete apartment building in a residential area, but there is a lot of noise that makes it difficult to hear, but you are still able to receive the broadcast radio waves. At this time, if the Internet radio position detection device 1 according to this embodiment is in a state where it can demodulate terrestrial digital broadcasts such as One Seg broadcasts and can generate a reception NIT list 210 (Figure 3), it can detect the relevant area based on the reception NIT list 210 and the NIT database 310 (Figure 6).

(Case 2) Assume a situation where a person tries to listen to a radio broadcast in a room in a reinforced concrete apartment building in a residential area, but there is a lot of noise that makes it difficult to hear, but the broadcast radio waves are not completely unreceivable, and the reception environment is worse than (Case 1). In this case, the Internet radio position detection device 1 according to this embodiment is assumed to be unable to demodulate the terrestrial digital broadcast signal and to have generated an empty reception NIT list 210. Even in such a case, if the Internet radio position detection device 1 can generate a frequency with a high reception electric field as the reception frequency list 220 (Figure 4), it can detect the relevant area based on the reception frequency list 220 and the frequency database 320 (Figure 8).

In the Internet radio position detection device 1, as shown in the area detection process of FIG. 11, detection of the relevant area based on the reception NIT list 210 is given priority over detection of the relevant area based on the reception frequency list 220 because it is believed that OneSeg broadcasting has a high error correction capability and can provide more accurate information in the reception environment.

(Modification)
In the Internet radio position detection device 1 of this embodiment, the demodulation unit 20 has both a digital demodulation unit 21 that generates a receiving NIT list 210 (Figure 3) and an analog demodulation unit 22 that generates a receiving frequency list 220 (Figure 4), and the area detection unit 30 uses the receiving NIT list 210 or the receiving frequency list 220 and detects the relevant area by referring to the NIT database 310 or the frequency database 320.
However, as a modification of this embodiment, the demodulation unit 20 may be provided with either the digital demodulation unit 21 or the analog demodulation unit 22. In this case, the area detection unit 30 is provided with either the corresponding NIT database 310 or the frequency database 320. When the area detection unit 30 acquires the reception NIT list 210, it refers to the NIT database 310 to detect the corresponding area. When the area detection unit 30 acquires the reception frequency list 220, it refers to the frequency database 320 to detect the corresponding area. This also makes it possible to detect the current location area, which is necessary when playing Internet radio, when the Internet radio receiving device does not have a current location detection function such as GPS.

1. Internet radio location detection device (Internet radio receiving device)
REFERENCE SIGNS LIST 10 Broadcast receiving antenna 20 Demodulation section 21 Digital demodulation section 22 Analog demodulation section 30 Area detection section 31 First corresponding area information generation section 32 Second corresponding area information generation section 33 Area determination section 40 Internet radio receiving section 50 Communication transmission/reception section 60 Audio reproduction section 210 Reception NIT list 220 Reception frequency list 310 NIT database 320 Frequency database 330 Corresponding area information

Claims (5)

An internet radio location detection device for receiving internet radio, comprising:
A broadcast receiving antenna for receiving at least one of radio waves of an analog radio broadcast and a terrestrial digital broadcast including a one-segment broadcast;
a demodulation unit which, when acquiring the terrestrial digital broadcast signal, searches the terrestrial digital broadcast and extracts a service ID for identifying a broadcast service from a network information table (NIT) of the detected signal to generate a reception NIT list, and, when acquiring the analog radio broadcast signal, searches for frequencies in the radio broadcast, extracts a high frequency in the reception electric field, and generates a reception frequency list;
a first corresponding area information generating unit that refers to an NIT database in which information on the service area of the broadcast service associated with the service ID is stored, compares the service ID indicated in the generated receiving NIT list with each service ID in each area indicated by the service area of the NIT database, calculates a matching rate of the broadcast service indicated by the service ID in each area as the matching rate, and generates first corresponding area information;
a second corresponding area information generating unit which refers to a frequency database in which information on the service area of the broadcast service associated with the frequency of the analog radio broadcast is stored, compares each frequency indicated in the generated receiving frequency list with the frequency indicated in the frequency database, extracts an area of matching frequencies, calculates a matching rate of the broadcast service indicated by the frequency within the extracted area as the matching rate, and generates second corresponding area information;
an area determination unit that refers to the first corresponding area information generated using the receiving NIT list or the second corresponding area information generated using the receiving frequency list, and detects the area with the highest local area ratio as the area in which the Internet radio position detection device itself is located;
an internet radio receiving unit that receives information on internet radio that is receivable as a broadcast service according to the detected area via the internet;
1. An internet radio location detection device comprising: The Internet radio position detection device of claim 1, characterized in that, when one or more of the service IDs are registered in the receiving NIT list generated by the demodulation unit, the area determination unit detects the area in which the Internet radio position detection device itself is located by prioritizing the first relevant area information generated using the receiving NIT list over the second relevant area information generated using the receiving frequency list. An internet radio location detection program for causing a computer to function as the internet radio location detection device according to claim 1 or 2. An internet radio location detection device for receiving internet radio, comprising:
A broadcast receiving antenna for receiving terrestrial digital broadcasting signals including one-segment broadcasting;
a digital demodulation unit that, when acquiring the terrestrial digital broadcast signal, searches for the terrestrial digital broadcast signal, extracts a service ID that identifies a broadcast service from an NIT of the detected signal, and generates a reception NIT list;
Refer to an NIT database in which information on the service area of the broadcast service associated with the service ID is stored, compare the service ID indicated in the generated reception NIT list with each service ID in each area indicated in the service area of the NIT database, calculate a match rate of the broadcast service indicated by the service ID in each area as the match rate, and generate corresponding area information;
an area detection unit that refers to the corresponding area information generated using the receiving NIT list and detects the area with the highest localization rate as the area in which the Internet radio position detection device itself is located;
an internet radio receiving unit that receives information on internet radio that is receivable as a broadcast service according to the detected area via the internet;
1. An internet radio location detection device comprising: An internet radio location detection device for receiving internet radio, comprising:
a broadcast receiving antenna for receiving broadcast radio waves including analog radio broadcasts;
an analog demodulation unit that, when acquiring a signal of a broadcast wave including the analog radio broadcast, searches for frequencies of broadcast services including the radio broadcast, extracts frequencies with high reception electric fields, and generates a reception frequency list;
Refer to a frequency database in which information on the service area of the broadcast service associated with the frequency of the broadcast wave including the analog radio broadcast is stored, compare each frequency indicated in the generated receiving frequency list with the frequency indicated in the frequency database, extract an area of matching frequencies, calculate a matching rate of the broadcast service indicated by the frequency within the extracted area as the matching rate, and generate corresponding area information;
an area detection unit that refers to the corresponding area information generated using the receiving frequency list and detects the area with the highest localization rate as the area where the Internet radio location detection device itself is located;
an internet radio receiving unit that receives information on internet radio that is receivable as a broadcast service according to the detected area via the internet;
1. An internet radio location detection device comprising:

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