JP2009278353A - On-vehicle digital tv receiving system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To notify a receiving status of digital television broadcast at a route to be passed through from now on. <P>SOLUTION: This on-vehicle digital TV receiving system which is mounted on a mobile object, and receives the digital television broadcast includes means for measuring receiving quality of the digital television broadcast, storing the measured receiving quality with positional information, notifying the receiving quality at a running route based on the positional information and the receiving quality which are stored, and acquiring positional information and receiving quality which other vehicles have. The means for storing the receiving quality stores positional information and receiving quality which are not stored among pieces of positional information and receiving quality which other vehicles have. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an in-vehicle digital TV receiving system that is mounted on a mobile body and receives digital television broadcasts.

  With the shift from analog broadcasting to digital broadcasting, digitization of in-vehicle television is progressing. Digital broadcasting has the merit that high-definition video can be viewed without causing the disturbance of video and audio as seen in analog broadcasting. On the other hand, if it falls below a certain reception level, there is a problem that video / audio cannot be received at all.

Also, an in-vehicle digital broadcast receiving system is disclosed that monitors the reception status of all current channels using one of a plurality of tuners and displays reception sensitivity information on an electronic program guide (for example, Patent Document 1). reference). According to this in-vehicle digital broadcast receiving system, the viewer can select a program from viewable contents by reflecting the current radio wave condition in the electronic program guide. For example, the viewer can avoid a channel having a bad reception status at the current time. The in-vehicle digital broadcast receiving system constantly monitors the reception status of all channels. When the radio wave condition recovers, the viewer can immediately return the channel. Therefore, the viewer can always select a receivable channel.
JP 2003-219303 A

  However, the background art described above has the following problems.

  Even in areas where video and audio with a little noise can be viewed by analog broadcasting until now, digital broadcasting often cannot be viewed at all. Also, digital broadcasting has only two patterns, when viewing is possible and when viewing is impossible. For this reason, in the weak electric field area where the reception level is near the threshold value, the image is repeatedly turned on / off. By repeating this on / off, the viewer feels very uncomfortable.

  Factors that make digital broadcasting unusable include various factors such as radio wave shielding and multipath fading by obstacles such as buildings in urban areas, and insufficient received signal strength in suburbs.

  Thus, in a mobile body (automobile), digital broadcasting cannot always be viewed in a favorable environment, and reception may suddenly become impossible. The viewer cannot know in advance the state of being unable to receive, and it is difficult to avoid the state of being unable to receive.

  Accordingly, the present invention has been made to solve at least one of the above-described problems, and provides an in-vehicle digital TV receiving system capable of notifying the reception status of digital television broadcasts in a path that will be passed from now on. The purpose is to provide.

In order to solve the above problems, this in-vehicle digital TV receiving system is
An in-vehicle digital TV receiving system that is mounted on a mobile body and receives a digital television broadcast,
Reception quality measuring means for measuring the reception quality of the digital television broadcast;
Reception quality storage means for storing the reception quality measured by the reception quality measurement means together with position information;
A reception quality notification means for notifying the reception quality in the travel route based on the position information and the reception quality stored in the reception quality storage means;
Acquisition means for acquiring position information and reception quality possessed by other vehicles,
The reception quality storage means stores position information and reception quality that are not stored among position information and reception quality of the other vehicle.

  By configuring in this way, priority is given to the position information and reception quality acquired by the host vehicle, and position information and reception quality that are not stored among position information and reception quality of other vehicles can be acquired.

In other configuration examples,
The reception quality measuring means measures an error rate of the digital television broadcast.

  With this configuration, the error rate can be acquired as the reception quality.

In other configuration examples,
The reception quality storage means stores the reception quality together with position information for each time when the error rate of the digital television broadcast is assumed to change.

  With this configuration, reception quality can be acquired periodically.

In other configuration examples,
The reception quality storage means stores the reception quality measured by the reception quality measurement means together with channel information.

  With this configuration, reception quality can be acquired for each channel.

In other configuration examples,
The reception quality measuring means measures reception quality of a plurality of channels.

  With this configuration, reception quality of a plurality of channels can be acquired.

In other configuration examples,
The said acquisition means acquires the positional information and reception quality which another vehicle has by vehicle-to-vehicle communication.

  By comprising in this way, the positional information and reception quality which were acquired by the other vehicle can be acquired.

In other configuration examples,
The acquisition means acquires position information and reception quality by communicating with a server storing position information and reception quality acquired by a plurality of vehicles.

  By comprising in this way, the positional information and reception quality acquired by the other vehicle can be acquired from the server in which the positional information and reception quality acquired by the plurality of vehicles are stored.

In other configuration examples,
Points used as location information common to all cars are set,
The reception quality storage means stores the position information of the nearest point as the position information.

  With this configuration, it is possible to acquire the reception status at a predetermined position common to each vehicle.

In other configuration examples,
The reception quality storage unit stores an average of the acquired reception quality and the reception quality acquired this time when the reception quality is acquired at the position.

  With this configuration, it is possible to reduce the influence of variation between acquired reception qualities.

In other configuration examples,
Classification means for classifying the reception quality measured by the reception quality measurement means;
The reception quality storage means stores the reception quality classified by the classification means together with position information.

  By configuring in this way, it is possible to reduce the influence of abnormal values acquired in an abnormal environment, level differences due to different data acquisition positions, and variations due to acquisition in a noisy environment. be able to.

In other configuration examples,
Route search means for searching for a route based on the classified reception quality,
The reception quality notifying unit notifies the route searched by the route searching unit.

  With this configuration, a route with good reception quality can be notified.

In other configuration examples,
An estimated arrival time calculating means for obtaining an estimated arrival time at an arbitrary point on the travel route;
The reception quality notification means notifies the estimated arrival time obtained by the estimated arrival time calculation means.

  With this configuration, the estimated arrival time can be notified.

In other configuration examples,
The reception quality notification means notifies the reception quality at the arrival point.

  With this configuration, the viewable program and the viewable time can be known.

  According to the disclosed in-vehicle digital TV reception system, it is possible to notify the reception status of the digital television broadcast in the path that will be passed.

  Next, the best mode for carrying out the present invention will be described based on the following embodiments with reference to the drawings.

  In all the drawings for explaining the embodiments, the same reference numerals are used for those having the same function, and repeated explanation is omitted.

(First embodiment)
An in-vehicle digital TV receiving system according to a first embodiment of the present invention will be described with reference to FIG.

  The in-vehicle digital TV receiving system 1000 according to the present embodiment includes a digital TV tuner 100. The digital television tuner 100 receives a digital television broadcast.

  The digital television tuner 100 has an RF (radio frequency) unit 102. The RF unit 102 converts the received digital television broadcast into a baseband signal. Further, the RF unit 102 inputs the digital television broadcast converted into the baseband signal to the OFDM demodulating unit 104 described later.

  The digital television tuner 100 has an OFDM demodulator 104. The OFDM demodulator 104 demodulates the baseband signal input by the RF unit 102. Further, the OFDM demodulator 102 inputs the demodulated baseband signal to an error correction unit 106 described later.

  The digital television tuner 100 has an error correction unit 106. The error correction unit 106 performs error correction on the demodulated baseband signal input by the OFDM demodulation unit 104. In addition, the error correction unit 106 obtains reception quality, for example, error rate information, and inputs the obtained error rate to the navigation system 200 described later. For example, the error correction unit 106 may obtain a bit error rate (BER) as an error rate. The error rate information may include information on the channel being viewed. Further, the error correction unit 106 inputs the demodulated baseband signal subjected to error correction to the demultiplexer 108.

  The digital television tuner 100 includes a demultiplexer 108. The demultiplexer 108 separates the demodulated baseband signal subjected to error correction into a plurality of transport streams (TS). The demultiplexer 108 inputs each separated transport stream to the decoding unit 110 described later.

  The digital television tuner 100 has a decoding unit 110. The decoding unit 110 decodes each input transport stream. In addition, the decoding unit 110 inputs the decoded transport stream to the navigation system 200. The decoded transport stream includes at least one of a video signal, an audio signal, and a data signal.

  The in-vehicle digital TV receiving system 1000 according to the present embodiment has a navigation system 200. The navigation system 200 acquires current position information by a GNSS receiver 500 described later. In addition, the navigation system 200 acquires error rate information of the digital broadcast being viewed by the digital TV tuner 100. The navigation system 200 stores position information and error rate information of the digital broadcast being viewed at every predetermined log acquisition timing.

  The navigation system 200 includes a CPU (Central Processing Unit) 202. The CPU 202 specifies the position of the vehicle on which the navigation system 200 is mounted, based on information input by a GNSS receiver 500, a gyro sensor 600, and a vehicle speed sensor 700 described later. In addition, the CPU 202 associates the error rate of the digital broadcast being viewed input from the digital TV tuner 100 with the specified position information, and stores it in an HDD (Hard Disk Drive) 212 described later. In addition, the CPU 202 notifies the position information and error rate information stored in the HDD 212. For example, the CPU 202 may cause the image processing unit 214 to display position information and error rate information on the display unit 300. Further, the CPU 202 may cause the audio processing unit 216 to notify the speaker 400 of position information and error rate information.

  The navigation system 200 has a ROM (Read Only Memory) 204. The ROM 204 stores information that does not need to be rewritten in the navigation system 200 and information that is difficult to rewrite.

  The navigation system 200 includes a RAM (Random Access Memory) 206. The RAM 206 temporarily stores the specified position information and error rate information of the digital broadcast being viewed until the log acquisition timing elapses.

  The navigation system 200 has an I / O (Input / Output) 208. The I / O 208 inputs the error rate information of the digital broadcast input from the digital TV tuner 100 to the RAM 206 via the bus 218. Also, the I / O 208 inputs a video signal of the transport stream input by the digital television tuner 100 to the image processing unit 214 described later via the bus 218. In addition, the I / O 208 inputs an audio signal of the transport stream input by the digital television tuner 100 to an audio processing unit 216 described later via the bus 218.

  The navigation system 200 includes an image processing unit 214. The image processing unit 214 performs control so that the input video signal can be displayed on the display unit 300 described later.

  The navigation system 200 has an audio processing unit 216. The audio processing unit 216 performs control so that the input audio signal can be output to the speaker 400 described later.

  The navigation system 200 has an HDD 212. The HDD 212 stores map data 2122. Also, the HDD 212 stores a position information / reception status information table 2124.

  The navigation system 200 has an I / F 210. The I / F 210 is an I / F between the navigation system 200 and the GNSS receiver 500, the gyro sensor 600, and the vehicle speed sensor 700.

  The in-vehicle digital TV receiving system 1000 according to the present embodiment includes a GNSS receiving device 500. The GNSS receiver 500 obtains the position of the vehicle on which the navigation system 200 is mounted, and inputs it to the navigation system 200 as vehicle position information. The Global Navigation Satellite System (GNSS) is a system that obtains the distance from each GNSS satellite by capturing three navigation satellites (GNSS orbiting satellites) (hereinafter referred to as GNSS satellites) from the aircraft. It is a navigation system that can obtain the flight position in three dimensions of the aircraft by adjusting the time with the signal from the eye navigation satellite. This satellite navigation includes the Global Positioning System (GPS), Galileo, etc.

  The in-vehicle digital TV receiving system 1000 according to the present embodiment has a gyro sensor 600. The gyro sensor 600 measures the azimuth angle of the vehicle on which the gyro sensor 600 is mounted.

  The in-vehicle digital TV receiving system 1000 according to this embodiment includes a vehicle speed sensor 700. The vehicle speed sensor 700 measures the speed of the vehicle on which the vehicle speed sensor 700 is mounted.

  The in-vehicle digital TV receiving system 1000 according to the present embodiment has a display unit 300. The display unit 300 displays the video signal received by the digital television tuner 100 input by the image processing unit 214.

  The in-vehicle digital TV receiving system 1000 according to this embodiment includes a speaker 400. The speaker 400 displays the audio signal received by the digital television tuner 100 input by the audio processing unit 216.

  A method for acquiring position information and reception status information in the in-vehicle digital TV receiving system 1000 according to the present embodiment will be described with reference to FIGS.

  The navigation system 200 determines whether the log acquisition timing has come (step S202). For example, the CPU 202 determines whether the log acquisition timing has elapsed. Here, the log acquisition timing is preferably a time when the error rate of digital broadcasting is assumed to change. Further, the log acquisition timing may be different depending on the environment in which the vehicle on which the navigation system 200 is mounted travels. For example, it may be different between urban areas and suburban areas.

  If it is not the log acquisition timing (step S202: NO), the process returns to step S202 and waits until the log acquisition timing is reached. On the other hand, when it is a log acquisition timing (step S202: YES), the navigation system 200 acquires position information from the GNSS receiver 500 (step S204). For example, the CPU 202 acquires position information from the GNSS receiver 500. For example, when traveling at the log acquisition position A and the log acquisition timing comes, the CPU 202 acquires the position A as the position information.

The navigation system 200 stores the positional information from the GNSS receiver 500 and the error rate information input by the digital television tuner 100 in association with each other (step S206). For example, the CPU 202 acquires error rate information temporarily stored in the RAM 206. For example, when the log acquisition timing has passed, error rate information acquired immediately before is acquired. Then, the CPU 202 stores the position information acquired in step S204 and the acquired error rate information in the HDD 212 in association with each other. As a result, in the position information / reception status information table 2124 of the HDD 212, as shown in FIG. 4, the channel 1 (Ch1) is viewed at the position A and the bit error rate is 1 × 10 ⁻⁵ . It is remembered that there is.

  Then, it returns to step S202 and the same process is performed.

For example, when traveling at the log acquisition position B, when the next log acquisition timing comes, the CPU 202 acquires the position B as the position information. Then, when the log acquisition timing has elapsed, the CPU 202 acquires error rate information acquired most recently. Then, the CPU 202 stores the acquired position information and the acquired error rate information in the HDD 212 in association with each other. As a result, in the position information / reception status information table 2124 of the HDD 212, as shown in FIG. 4, the channel 1 (Ch1) is viewed at the position B and the bit error rate is 1 × 10 ⁻⁵ . It is remembered that there is.

Further, for example, when traveling at the log acquisition position C, when the next log acquisition timing comes, the CPU 202 acquires the position C as the position information. Then, when the log acquisition timing has elapsed, the CPU 202 acquires error rate information acquired most recently. Then, the CPU 202 stores the acquired position information and the acquired error rate information in the HDD 212 in association with each other. As a result, in the position information / reception status information table 2124 of the HDD 212, as shown in FIG. 4, the channel 2 (Ch2) is viewed at the position C, and the bit error rate is 1 × 10 ⁻³ . It is remembered that there is.

  According to the present embodiment, it is possible to collect information indicating the reception status of the digital broadcast being viewed along with the position information on the road on which the vehicle on which the in-vehicle digital TV receiving system 1000 is mounted travels. For this reason, when traveling on the same road after the second time, it is possible to know the reception status of digital broadcasting on the road.

(Second embodiment)
An in-vehicle digital TV receiving system according to a second embodiment of the present invention will be described with reference to FIG.

  The in-vehicle digital TV receiving system 1000 according to the present embodiment has a plurality of digital TV tuners in the in-vehicle digital TV receiving system described with reference to FIG. In the present embodiment, the case where the in-vehicle digital TV receiving system described with reference to FIG. 1 includes the digital TV tuner 150 will be described, but a plurality of digital TV tuners may be included. For example, the number of digital TV tuners may be three or more. By doing so, it is possible to improve the reception sensitivity by space diversity. At least one of the plurality of digital TV tuners obtains error rate information in all channels. For example, the digital television tuner 150 acquires error rate information in all channels. For example, when the log acquisition timing comes, the digital TV tuner 150 scans all channels and acquires error rate information of all channels.

  The digital television tuner 150 has an RF unit 152. The RF unit 152 converts the received digital broadcast into a baseband signal. Further, the RF unit 152 inputs the digital broadcast converted into the baseband signal to an OFDM demodulation unit 154 described later. In addition, when it is the log acquisition timing, the RF unit 152 scans all the channels and converts each channel included in the digital broadcast into a baseband signal.

  The digital television tuner 150 has an OFDM demodulator 154. The OFDM demodulator 154 demodulates the baseband signal input by the RF unit 152. Further, the OFDM demodulator 154 inputs the demodulated baseband signal to the OFDM demodulator 104. The OFDM demodulator 104 performs diversity combining of the demodulated baseband signal input from the RF unit 102 and the demodulated baseband signal input from the OFDM demodulator 154. Then, OFDM demodulation section 104 inputs the diversity combined signal to error correction section 106. By doing so, the receiving sensitivity can be improved.

  Further, when it is the log acquisition timing, the OFDM demodulator 154 does not input the demodulated baseband signal to the OFDM demodulator 104 but inputs it to an error correction unit 156 described later. For example, when the CPU 202 detects the log acquisition timing, the CPU 202 notifies the OFDM demodulation unit 154 that the log acquisition timing is reached. When the OFDM demodulation unit 154 is notified by the CPU 202 that it is the log acquisition timing, the OFDM demodulation unit 154 instructs the RF unit 152 to scan all channels and inputs the demodulated baseband signal to the OFDM demodulation unit 104. Stop doing. Then, OFDM demodulation section 154 inputs the demodulated baseband signal to error correction section 156.

  The digital television tuner 150 has an error correction unit 156. The error correction unit 156 performs error correction on the demodulated baseband signal input by the OFDM demodulation unit 154. Further, the error correction unit 106 obtains error rate information and inputs the obtained error rate to the navigation system 200 described later. For example, the error correction unit 106 may obtain a bit error rate as an error rate. The error rate information may include channel information.

  A method for acquiring position information and reception status information in the in-vehicle digital TV receiving system 1000 according to the present embodiment will be described with reference to FIGS.

  The navigation system 200 determines whether the log acquisition timing has come (step S602). For example, the CPU 202 determines whether the log acquisition timing has elapsed. Here, the log acquisition timing is preferably a time when the error rate of digital broadcasting is assumed to change. Further, the log acquisition timing may be different depending on the environment in which the vehicle on which the navigation system 200 is mounted travels. For example, it may be different between urban areas and suburban areas.

  If it is not the log acquisition timing (step S602: NO), the process returns to step S602 and waits until the log acquisition timing is reached. On the other hand, when it is a log acquisition timing (step S602: YES), the navigation system 200 acquires position information from the GNSS receiver 500 (step S604). For example, the CPU 202 acquires position information from the GNSS receiver 500. For example, when traveling at the log acquisition position A and the log acquisition timing comes, the CPU 202 acquires the position A as the position information.

  The navigation system 200 stores the positional information from the GNSS receiver 500 and the error rate information of all the channels input by the digital television tuner 100 in association with each other (step S606). For example, the CPU 202 notifies the OFDM demodulator 154 that the log acquisition timing has come. The OFDM demodulator 154 instructs the RF unit 152 to scan all channels according to the log acquisition timing notified by the CPU 202. Then, the baseband signals of all channels input by the RF unit 152 are demodulated. Also, the OFDM demodulator 154 stops inputting the demodulated baseband signal to the OFDM demodulator 104 and inputs it to the error corrector 156. The error correction unit 106 obtains error rate information of all channels and inputs the obtained error rates of all channels to the navigation system 200 described later. The error rates of all channels input by the digital TV tuner 150 are temporarily stored in the RAM 206 of the navigation system 200.

The CPU 202 acquires error rate information for all channels temporarily held in the RAM 206. Then, the CPU 202 stores the positional information acquired in step S604 and the acquired error rate information of all channels in the HDD 212 in association with each other. As a result, in the position information / reception status information table 2124 of the HDD 212, as shown in FIG. 8, channel 1 (Ch1), channel 2 (Ch2), channel 3 (Ch3), channel 4 (Ch4) at position A ,... ^Are stored as 1 × 10 ⁻⁵ , 1 × 10 ⁻⁶ , 1 × 10 ⁻³ , and 1 × 10 ⁻⁶ , respectively.

  Thereafter, the process returns to step S602, and the same processing is performed.

For example, when traveling at the log acquisition position B, when the next log acquisition timing comes, the CPU 202 acquires the position B as the position information. Then, when the log acquisition timing has elapsed, the CPU 202 acquires error rate information for all channels input by the digital television tuner 150. Then, the CPU 202 stores the acquired position information in association with the acquired error rate information of all channels in the HDD 212. As a result, the position information / reception status information table 2124 of the HDD 212, as shown in FIG. 8, Ch1 in the position B, Ch2, Ch3, Ch4, as the bit error rate, ..., respectively 2 × 10 ^-2 , 8 × 10 ⁻⁵ , 2 × 10 ⁻³ , and 3 × 10 ⁻⁵ are stored.

Further, for example, when traveling at the log acquisition position C, when the next log acquisition timing comes, the CPU 202 acquires the position C as the position information. Then, when the log acquisition timing has elapsed, the CPU 202 acquires error rate information for all channels input by the digital television tuner 150. Then, the CPU 202 stores the acquired position information in association with the acquired error rate information of all channels in the HDD 212. As a result, the position information / reception status information table 2124 of the HDD 212, as shown in FIG. 8, Ch1 in the position B, Ch2, Ch3, Ch4, as the bit error rate, ..., respectively 4 × 10 ^-3 , 5 × 10 ⁻⁸ , 1 × 10 ⁻³ , 1 × 10 ⁻⁵ are stored.

  According to the present embodiment, on the road on which the vehicle on which the in-vehicle digital TV receiving system 1000 is mounted traveled, it is possible to collect information indicating the reception status of all channels of digital broadcasting together with the position information. For this reason, the amount of information collection can be increased. Further, when traveling on the same road after the second time, it is possible to know the reception status of digital broadcasting of all channels on the road.

(Third embodiment)
An in-vehicle digital TV receiving system according to a third embodiment of the present invention will be described with reference to FIG.

  The navigation system 200 according to the present embodiment is different from the navigation system according to the above-described embodiment in the information stored in the HDD 212. In the navigation system 200 according to the present embodiment, the HDD 212 includes a location information / reception status information data primary storage unit 2126. The CPU 202 associates the position information with the error rate at the log acquisition timing and stores them in the position information / reception status information data primary storage unit 2126. Then, the CPU 202 inputs the position information and the error rate stored in the position information / reception status information data primary storage unit 2126 to the data communication system 800 described later via the I / F 210.

  The in-vehicle digital TV receiving system 1000 according to the present embodiment includes a data communication system (DCM: Data Communication System) 800 in the in-vehicle digital TV receiving system described with reference to FIG. A data communication system (DCM) 800 is connected to the navigation system 200. The data communication system 800 is connected to a server 900 described later. Then, the data communication system 800 transmits the position information and the error rate stored in the navigation system 200 to the server 900. Further, the data communication system 800 receives the reception status information transmitted by the server 900.

  The data communication system 800 has an RF unit 802. The RF unit 802 encodes, modulates, converts to radio frequency, and transmits position information and error rate information input by a baseband unit 804 described later. Further, the RF unit 802 performs demodulation processing and decoding processing on the position information / reception status information transmitted from the server 900. In addition, the RF unit 802 inputs the position information / reception status information on which demodulation processing and decoding processing have been performed to the baseband processing unit 804.

  The data communication system 800 includes a baseband (BB) processing unit 804. The baseband processing unit 804 performs baseband processing on the position information and error rate information input by the navigation system 200, and sends the position information and error rate information subjected to the baseband processing to the RF unit 802. input. In addition, the baseband processing unit 804 inputs the position information / reception status information input by the RF unit 802 to the navigation system 200.

  In the navigation system 200, the CPU 202 stores the position information / reception status information input by the data communication system 800 in the position information / reception status information table 2124 of the HDD 212. Further, the CPU 202 generates a reception status request signal for requesting the reception status, and transmits the generated reception status request signal to the server 900. For example, based on the set travel route, the CPU 202 generates a reception status request signal for requesting the reception status on the subsequent travel route from the current travel position, and transmits the generated reception status request signal to the server 900. To do. The reception status request signal includes position information for requesting the reception status.

  The in-vehicle digital TV receiving system 1000 according to the present embodiment includes a server 900 in the in-vehicle digital TV receiving system 1000 described with reference to FIG.

  The server 900 statistically processes the position information and error rate information transmitted from each vehicle. Then, the server 900 holds the statistically processed position information and error rate information in the position information / reception status information database 906. Further, based on the reception status request signal transmitted by the in-vehicle digital TV reception system 1000, the server 900 transmits error rate information at a position specified by the position information included in the reception status request signal.

  The server 900 includes a signal processing unit 902. The signal processing unit 902 receives position information and error rate information transmitted by the in-vehicle digital TV receiving system 1000 mounted on each vehicle. The signal processing unit 902 inputs the received position information and error rate information to the data processing unit 904. Further, the signal processing unit 902 transmits the error rate information requested by the in-vehicle digital TV reception system 1000 to the corresponding in-vehicle digital TV reception system 1000.

  The server 900 has a data processing unit 904. The data processing unit 904 performs statistical processing of the position information and error rate information transmitted by the in-vehicle digital TV receiving system 1000 mounted on each vehicle input by the signal processing unit 902. For example, the data processing unit 904 groups position information, which are neighboring positions, among the positions specified by the position information. Then, the data processing unit 904 performs statistical processing on the error rate corresponding to the grouped position information. For example, the data processing unit 904 may obtain the error rate in the grouped position information by averaging the error rates corresponding to the grouped position information. The data processing unit 904 stores the statistically processed result in a position information / reception status information database 906 described later.

  The server 900 has a position information / reception status information database 906. The position information / reception status information database 906 stores the result of statistical processing based on the position information input by the data processing unit 904 and the error rate.

  A method for acquiring position information and reception status information in the in-vehicle digital TV receiving system 1000 according to the present embodiment will be described with reference to FIGS.

  The navigation system 200 determines whether the log acquisition timing has come (step S1002). For example, the CPU 202 determines whether the log acquisition timing has elapsed. Here, the log acquisition timing is preferably a time when the error rate of digital broadcasting is assumed to change. Further, the log acquisition timing may be different depending on the environment in which the vehicle on which the navigation system 200 is mounted travels. For example, it may be different between urban areas and suburban areas.

  If it is not the log acquisition timing (step S1002: NO), the process returns to step S1002 and waits until the log acquisition timing is reached. On the other hand, when it is a log acquisition timing (step S1002: YES), the navigation system 200 acquires position information from the GNSS receiver 500 (step S1004). For example, the CPU 202 acquires position information from the GNSS receiver 500. For example, when traveling at the log acquisition position A and the log acquisition timing comes, the CPU 202 acquires the position A as the position information.

The navigation system 200 stores the positional information acquired from the GNSS receiver 500 and the error rate information input by the digital television tuner 100 in association with each other (step S1006). For example, the CPU 202 acquires error rate information temporarily stored in the RAM 206. For example, when the log acquisition timing has elapsed, the CPU 202 acquires error rate information acquired most recently. Then, the CPU 202 stores the position information acquired in step S1004 and the acquired error rate information in the HDD 212 in association with each other. As a result, the position information / reception status information primary storage unit 2126 of the HDD 212 is viewing the channel 1 (Ch1) at the position A and the bit error rate is 1 × 10 ^{− as shown in FIG.} It is remembered that it is ⁵ .

  The navigation system 200 transmits the position information and the error rate information stored in association with each other to the server 900 (step S1008). For example, the CPU 202 acquires position information and error rate information stored in the HDD 212. Then, the CPU 202 inputs the acquired position information and error rate information to the data communication system 800 via the I / F 210. The data communication system 800 transmits the input position information and error rate information to the server 900.

  The server 900 stores the position information and error rate information transmitted by the data communication system 800 in the position information / reception status information database 906.

  Thereafter, the process returns to step S1002 and the same processing is performed.

For example, when traveling at the log acquisition position B, when the next log acquisition timing comes, the CPU 202 acquires the position B as the position information. Then, when the log acquisition timing has elapsed, the CPU 202 acquires error rate information acquired most recently. Then, the CPU 202 stores the acquired position information and the acquired error rate information in the HDD 212 in association with each other. As a result, the position information / reception status information primary storage unit 2126 of the HDD 212 is viewing channel 1 (Ch1) at position B and its bit error rate is 1 × 10 ^{− as shown in FIG.} It is remembered that it is ⁵ . Then, the CPU 202 acquires the position information and error rate information stored in the HDD 212, and inputs the acquired position information and error rate information to the data communication system 800 via the I / F 210. The data communication system 800 transmits the input position information and error rate information to the server 900. The server 900 stores the position information and error rate information transmitted by the data communication system 800 in the position information / reception status information database 906.

Further, for example, when traveling at the log acquisition position C, when the next log acquisition timing comes, the CPU 202 acquires the position C as the position information. Then, when the log acquisition timing has elapsed, the CPU 202 acquires error rate information acquired most recently. Then, the CPU 202 stores the acquired position information and the acquired error rate information in the HDD 212 in association with each other. As a result, the position information / reception status information primary storage unit 2126 of the HDD 212 is viewing the channel 2 (Ch2) at the position C and the bit error rate is 1 × 10 ^{− as shown in FIG. 3} is remembered. Then, the CPU 202 acquires the position information and error rate information stored in the HDD 212, and inputs the acquired position information and error rate information to the data communication system 800 via the I / F 210. The data communication system 800 transmits the input position information and error rate information to the server 900. The server 900 stores the position information and error rate information transmitted by the data communication system 800 in the position information / reception status information database 906.

  Position information / error rate information is also transmitted from each vehicle on which the in-vehicle digital TV receiving system 1000 is mounted. For example, a case where a plurality of vehicles travels at position A, position B, and position C will be described. Here, it is assumed that the channel being viewed by each vehicle is different. In this case, the position information / reception status information database 906 of the server 900 stores the reception status information of each channel at each position, as shown in FIG.

  Thereafter, the in-vehicle digital TV receiving system 1000 transmits a reception status request signal to the server 900. The reception status request signal includes information on areas for which reception status information is requested. The requested area information includes, for example, position information input by the GNSS receiver 500. For example, the position A, the position B, and the position C are included as information on the requested area. When the server 900 receives the reception status request signal transmitted by the in-vehicle digital TV reception system 1000, the server 900 acquires error rate information corresponding to the area information based on the requested area information included in the reception status request signal. To do. Then, the server 900 transmits the acquired error rate information to the in-vehicle digital TV reception system 1000 that has transmitted the reception status request signal.

  When the in-vehicle digital TV receiving system 1000 receives the error rate information transmitted from the server 900, it stores the error rate information in the position information / reception status information table 2124. For example, when the in-vehicle digital TV reception system 1000 acquires error rate information corresponding to the position A, the position B, and the position C, the position information / reception status information table 2124 includes the position A, the position, as shown in FIG. The error rate information of each channel at B and position C is stored.

  According to the present embodiment, the position information and the error rate information acquired by the in-vehicle digital TV receiving system 1000 mounted on each vehicle are stored in the server 900, so that the position information and the error rate information are unified. Can manage. For this reason, even if the route travels for the first time, the error rate information can be acquired in advance by requesting the server 900 for error rate information corresponding to the position information included in the travel route. Further, the server 900 can create more accurate reception status information by statistically processing the position information and error rate information transmitted by the in-vehicle digital TV reception system 1000 mounted on each vehicle. Therefore, it is possible to provide the reception status information with higher accuracy by the viewer.

(Fourth embodiment)
An in-vehicle digital TV receiving system according to a fourth embodiment of the present invention will be described.

  As shown in FIG. 15, the navigation system 200 according to the present embodiment is different from the in-vehicle digital TV reception system described with reference to FIG. 9 in that an inter-vehicle communication system 850 is provided instead of the data communication system 800. . The CPU 202 associates the position information with the error rate at the log acquisition timing and stores them in the position information / reception status information data primary storage unit 2126. Then, the CPU 202 inputs the position information and error rate stored in the position information / reception status information data primary storage unit 2126 to the vehicle-to-vehicle communication system 850 described later via the I / F 210.

  The inter-vehicle communication system 850 is connected to the navigation system 200. The inter-vehicle communication system 850 transmits the position information and the error rate information to a vehicle equipped with the in-vehicle digital TV receiving system 1000 other than the vehicle in which the in-vehicle digital TV receiving system 1000 is installed. Further, the inter-vehicle communication system 850 receives position information and error rate information transmitted by other vehicles.

  The inter-vehicle communication system 850 includes an RF unit 852. The RF unit 852 encodes, modulates, converts to a radio frequency, and transmits position information and error rate information input by a baseband unit 854 described later. Further, the RF unit 852 performs demodulation processing and decoding processing on the position information / reception status information transmitted by another vehicle. Also, the RF unit 852 inputs the position information / reception status information subjected to the demodulation process and the decoding process to the baseband processing unit 854.

  The inter-vehicle communication system 850 includes a baseband processing unit 854. The baseband processing unit 854 performs baseband processing on the position information and error rate information input by the navigation system 200, and sends the position information and error rate information subjected to the baseband processing to the RF unit 852. input. Also, the baseband processing unit 854 inputs the position information / reception status information input by the RF unit 852 to the navigation system 200.

  In the navigation system 200, the CPU 202 stores the position information / reception situation information input by the inter-vehicle communication system 850 in the position information / reception situation information table 2124 of the HDD 212.

  A method for acquiring position information and reception status information in the in-vehicle digital TV receiving system 1000 according to the present embodiment will be described with reference to FIGS. 16 and 17.

  The navigation system 200 determines whether the log acquisition timing has come (step S1602). For example, the CPU 202 determines whether the log acquisition timing has elapsed. Here, the log acquisition timing is preferably a time when the error rate of digital broadcasting is assumed to change. Further, the log acquisition timing may be different depending on the environment in which the vehicle on which the navigation system 200 is mounted travels. For example, it may be different between urban areas and suburban areas.

  If it is not the log acquisition timing (step S1602: NO), the process returns to step S1602 and waits until the log acquisition timing is reached. On the other hand, when it is a log acquisition timing (step S1602: YES), the navigation system 200 acquires position information from the GNSS receiver 500 (step S1604). For example, the CPU 202 acquires position information from the GNSS receiver 500. For example, when traveling at the log acquisition position A and the log acquisition timing comes, the CPU 202 acquires the position A as the position information.

  The navigation system 200 stores the positional information acquired from the GNSS receiver 500 and the error rate information input by the digital television tuner 100 in association with each other (step S1606). For example, the CPU 202 acquires error rate information temporarily stored in the RAM 206. For example, when the log acquisition timing has passed, error rate information acquired immediately before is acquired. Then, the CPU 202 stores the position information acquired in step S1604 and the acquired error rate information in the HDD 212 in association with each other. As a result, the position information / reception status information data primary storage unit 2126 of the HDD 212 is viewing channel 2 (Ch2) at position A and the bit error rate is BER2, as shown in FIG. Is remembered.

  The navigation system 200 transmits the position information and the error rate information stored in association with each other to other vehicles (step S1608). For example, the CPU 202 acquires position information and error rate information stored in the HDD 212. Then, the CPU 202 inputs the acquired position information and error rate information to the inter-vehicle communication system 850 via the I / F 210. The inter-vehicle communication system 850 transmits the input position information and error rate information to other vehicles.

  The other vehicle stores the position information and the error rate information transmitted by the inter-vehicle communication system 850 in the HDD 212 mounted on the other vehicle.

  Thereafter, the process returns to step S1602 and the same processing is performed.

  For example, when traveling at the log acquisition position B, when the next log acquisition timing comes, the CPU 202 acquires the position B as the position information. Then, when the log acquisition timing has elapsed, the CPU 202 acquires error rate information acquired most recently. Then, the CPU 202 stores the acquired position information and the acquired error rate information in the HDD 212 in association with each other. As a result, as shown in FIG. 18, channel 1 (Ch1) is viewed at position B in the position information / reception status information data primary storage unit 2128 of HDD 212, and the bit error rate is BER1. Is remembered. Then, the CPU 202 acquires the position information and error rate information stored in the HDD 212, and inputs the acquired position information and error rate information to the inter-vehicle communication system 850 via the I / F 210. The inter-vehicle communication system 850 transmits the input position information and error rate information to another vehicle.

  The other vehicle stores the position information and the error rate information transmitted by the inter-vehicle communication system 850 in the HDD 212 mounted on the other vehicle.

  Further, for example, when traveling at the log acquisition position C, when the next log acquisition timing comes, the CPU 202 acquires the position C as the position information. Then, when the log acquisition timing has elapsed, the CPU 202 acquires error rate information acquired most recently. Then, the CPU 202 stores the acquired position information and the acquired error rate information in the HDD 212 in association with each other. As a result, the position information / reception status information data primary storage unit 2126 of the HDD 212 is viewing channel 2 (Ch2) at position C and the bit error rate is BER3, as shown in FIG. Is remembered. Then, the CPU 202 acquires the position information and error rate information stored in the HDD 212, and inputs the acquired position information and error rate information to the inter-vehicle communication system 850 via the I / F 210. The inter-vehicle communication system 850 transmits the input position information and error rate information to another vehicle.

  The other vehicle stores the position information and the error rate information transmitted by the inter-vehicle communication system 850 in the HDD 212 mounted on the other vehicle.

For example, a vehicle onboard digital TV receiver system 1000 ₁ is mounted, it will be described for performing other vehicle and inter-vehicle communication. The position information / reception status information table 2126 of the in-vehicle digital TV reception system 1000 ₁ stores position information and error rate information as described with reference to FIG. In this case, the data temporarily stored in the location information / reception status information data primary storage unit 2126 is transmitted to another vehicle and then stored in the location information / reception status information table 2124. Further, other vehicles, vehicle and vehicle-vehicle digital TV receiver system 1000 ₂ is mounted digital TV receiver system 1000 ₃ includes a vehicle mounted. Vehicle to the digital TV receiver system 1000 ₂ of the position information / reception status information table 2124, and the position information and error rate information shown in FIG. 19 is stored. Further, the in-vehicle digital TV receiver system 1000 _third position information / reception status information table 2124, and the position information and error rate information shown in FIG. 20 is stored. The vehicle on which the in-vehicle digital TV receiving system 1000 ₁ is mounted can communicate with the vehicle in which the in-vehicle digital TV receiving system 1000 ₂ is mounted and the vehicle in which the in-vehicle digital TV receiving system 1000 ₃ is mounted. The position information acquired by the vehicle and the error rate information are acquired. As a result, the in-vehicle digital TV receiver system 1000 _first position information / reception status information table 2124 as shown in FIG. 21, the position information acquired by another vehicle, is added and the error rate information . In this case, the position information and error rate information acquired by the host vehicle are not rewritten even if acquired by another vehicle. In other words, priority is given to the error rate information acquired by the host vehicle. The performance of the installed digital TV tuner may differ between the own vehicle and the other vehicle. Therefore, priority is given to the error rate information acquired by the digital TV tuner mounted in the own vehicle.

  According to the present embodiment, position information and error rate information acquired by other vehicles can be acquired by inter-vehicle communication. For this reason, since position information and error rate information acquired by another vehicle immediately before performing inter-vehicle communication can be acquired, position information and error rate information can be acquired in a state close to real time.

(Fifth embodiment)
An in-vehicle digital TV receiving system according to a fifth embodiment of the present invention will be described.

  The configuration of the in-vehicle digital TV receiving system according to the present embodiment is the same as the above-described embodiment.

  In the in-vehicle digital TV receiving system according to the present embodiment, points used as position information common to all vehicles are set. The navigation system 200 according to the present embodiment detects the closest point from the common points at the log acquisition timing. Then, the navigation system 200 stores the detected point position as position information. For example, the common point may be an intersection as shown in FIG. Further, the position is not limited to an intersection, and any position where position information is known may be used. In this case, for example, as shown in FIG. 23, when the log acquisition timing comes when the vehicle is positioned at the position A ′, the position of the position A closest to the position A ′ is stored as position information. Further, when the log acquisition timing comes when the vehicle is positioned at the position B ′, the position of the position B closest to the position B ′ is stored as position information. Further, when the log acquisition timing comes when the vehicle is located at the position C ′, the position of the position C closest to the position C ′ is stored as position information. As a result, the position information / reception status information table 2124 of the HDD 212 stores the following information as shown in FIG. When the channel 1 is viewed at the position A ′, the position A is stored as position information, and the error rate at the position A ′ is stored as error rate information. When the channel 1 is viewed at the position B ′, the position B is stored as the position information, and the error rate at the position B ′ is stored as the error rate information. When the channel 2 is viewed at the position C ′, the position C is stored as position information, and the error rate at the position C ′ is stored as error rate information. In this case, the log acquisition timing can be arbitrarily set by the viewer.

  In addition, when traveling on the same route as before, the error rate acquired this time may be different from the error rate acquired last time. In this case, as the error rate information, an average value of the previously acquired error rate and the currently acquired error rate may be stored as new error rate information. For example, as shown in FIG. 25, in the situation where the error rates of channel 1, channel 1, and channel 2 are acquired at position A, position B, and position C, respectively, at position A, position B, and position D, The error rates for channel 2, channel 1 and channel 2 were obtained, respectively. In this case, the error rate at position B is acquired in duplicate. In this case, the error rate of channel 1 at position B is the average value of the error rate acquired last time and the error rate acquired this time.

  According to the present embodiment, it is possible to acquire the reception status at a predetermined position common to each vehicle. For this reason, when position information / error rate information is acquired at a log acquisition timing arbitrarily set by the viewer, the position information is rounded to a representative value common to each car, and thus innumerable position information is generated. Can be avoided.

(Sixth embodiment)
An in-vehicle digital TV receiving system according to a sixth embodiment of the present invention will be described.

  The configuration of the in-vehicle digital TV receiving system 1000 according to the present embodiment is the same as the above-described embodiment.

  In the in-vehicle digital TV receiving system according to the above-described embodiment, the navigation system 200 has been described with respect to the case where the error rate information input by the digital TV tuner 100 is stored as it is.

  In the navigation system 200 according to the present embodiment, the CPU 202 classifies and stores the error rate information input by the digital television tuner 100 into a plurality of types. The classification includes, for example, a state where reception is not possible, a state where reception level is bad, a state where reception level is medium, and a state where reception level is good. For example, the CPU 202 determines that the reception level is good when the input error rate information is greater than or equal to a threshold that can be considered good. Further, for example, when the input error rate information is equal to or higher than a threshold that can be regarded as a medium reception state and less than a threshold that can be regarded as a good reception state, the CPU 202 is in a state where the reception level is medium. to decide. For example, the CPU 202 determines that the reception level is in a bad state when the input error rate information is equal to or higher than a threshold that can be regarded as a bad reception state and less than a threshold that can be regarded as a medium reception state. Further, for example, the CPU 202 determines that reception is impossible when the input error rate information is less than a threshold that can be regarded as a bad reception state.

  The CPU 202 classifies the error rate information based on the reception level. Then, the information is stored in the position information / reception status information table 2124 of the HDD 212. As a result, for example, in the position information / reception status information table 2124, as shown in FIG. 26, information obtained by classifying error rate information in each channel is stored for each position information.

  Thus, when error rate information at each position is stored, the CPU 202 may perform route guidance based on information obtained by classifying the error rate information. For example, the CPU 202 guides a route with good reception status. Further, for example, when searching for a route from the departure place to the destination, the CPU 202 may use reception status information on a plurality of candidate routes as a weighting factor. In this case, for example, the route with the best metric may be presented to the driver as the reception status priority route. Further, for example, the metric may be calculated by obtaining an average value of the weighting factors of the reception status information for each route.

  For example, a case where the position information / reception status information table 212 shown in FIG. 26 is stored in the HDD 212 will be described. In this case, when the departure place and the destination shown in FIG. 27 are designated, the CPU 202 selects a route with good reception status. For example, the CPU 202 selects a route passing through the positions A, E, F, G, K, L, and P as the reception status priority route. The metric in this case is calculated as 3 + 2 + 3 + 2 + 3 + 3 + 2) /7=2.57.

  According to the present embodiment, when a route search is performed, it is possible to search for a route with good reception status for the scheduled viewing channel. As a result, the viewer can reduce the situation in which the digital broadcast cannot be viewed.

(Seventh embodiment)
An in-vehicle digital TV receiving system according to a seventh embodiment of the present invention will be described.

  The configuration of the in-vehicle digital TV receiving system 1000 according to the present embodiment is the same as the above-described embodiment.

  In the present embodiment, as shown in FIG. 28, the position information for each log acquisition point and the reception status of each channel are stored as in the in-vehicle digital TV receiving system 1000 shown in the above-described embodiment. Here, the reception status of each channel may be error rate information or may be classified into a plurality of error rate information.

  The CPU 202 refers to the position information / reception status information table 2124 stored in the HDD 212 and sets a route to the destination. Further, the CPU 202 obtains an estimated passage time on the route. For example, the CPU 202 acquires vehicle speed information from the vehicle speed sensor 700. Then, the CPU 202 obtains an estimated passage time on the route based on the vehicle speed information, and instructs the image processing unit 214 to display the obtained expected passage time on the display unit 300 as shown in FIG. To do. The image processing unit 214 displays the route and the expected passage time at each position in the route on the display unit 300 in accordance with a command from the CPU 202. In this case, as shown in FIG. 29, the expected passage time at any position between the positions may be displayed. Further, as shown in FIG. 30, a program that can be viewed at the estimated passage time may be displayed. In this case, when it is determined that reception is not possible from the reception status, the program determined to be unreceivable may not be displayed. In this case, the reception status is classified as receivable / unreceivable. Further, instead of classifying the reception status as receivable / unreceivable, the reception sensitivity prediction level may be classified into three or more situations and displayed.

  According to this embodiment, it is possible to display the reception status prediction information on the set route on the digital broadcast program guide. For this reason, the viewer can know the program that can be viewed and the time that can be viewed. In addition, the viewer can avoid selecting a program that cannot be viewed. Further, from the viewpoint of avoiding the viewer from selecting a program that cannot be viewed, as shown in FIG. 31, a position where reception is impossible and a channel where reception is impossible may be displayed. .

(Eighth embodiment)
An in-vehicle digital TV receiving system according to an eighth embodiment of the present invention will be described.

  The configuration of the in-vehicle digital TV receiving system 1000 according to the present embodiment is the same as that of the in-vehicle digital TV receiving system 1000 described with reference to FIG.

  The in-vehicle digital TV receiving system 1000 according to the present embodiment accesses the server 900 when setting a route to the destination. Then, the in-vehicle digital TV receiving system 1000 downloads the position information / reception status information of the required area from the server 900. Then, as described in the sixth embodiment, the in-vehicle digital TV reception system 1000 performs route search and display of the reception status on the electronic program guide based on the downloaded position information / reception status information. The in-vehicle digital TV receiving system 1000 may discard the downloaded information after setting the route.

  According to the present embodiment, the amount of information that needs to be stored in the HDD 212 can be reduced.

(Ninth embodiment)
An in-vehicle digital TV receiving system according to a ninth embodiment of the present invention will be described.

  The configuration of the in-vehicle digital TV receiving system 1000 according to the present embodiment is the same as the above-described embodiment.

  In the in-vehicle digital TV receiving system 1000 according to the present embodiment, the digital TV tuner 100 is. The error rate is measured even when digital broadcasting is not being viewed. In this case, the digital television tuner 100 may scan all channels or a part of channels. The CPU 202 stores the error rate information input by the digital television tuner 100 in the position information / reception status information table 2124 of the HDD 212 together with the position information.

  According to the present embodiment, it is possible to increase the position information / reception status information that can be collected.

(Tenth embodiment)
An in-vehicle digital TV receiving system according to a tenth embodiment of the present invention will be described.

  The configuration of the in-vehicle digital TV receiving system 1000 according to the present embodiment is the same as that of the above-described in-vehicle digital TV receiving system described with reference to FIG.

In the fourth embodiment described above, information stored in the position information / reception status information data primary storage unit 2126 of the own vehicle and position information / reception status information data primary storage unit 2126 of other vehicles are stored. An explanation has been given of the case where shared information is shared. In this case, as shown in FIG. 32, the vehicle-mounted digital TV receiver and the system 1000 _first position information / reception status information data stored in the data temporary storage unit 2126, the vehicle-mounted digital TV receiver system 1000 ₂ and the in-vehicle digital TV receiver system 1000 ₃ position information / information stored in the reception status information data temporary storage unit 2126 and the information exchange is performed one-on-one. In this case, the acquired information is stored in the position information / reception status information table 2124 of each vehicle.

  The in-vehicle digital TV receiving system 1000 according to the present embodiment is stored in the position information / reception status information table 2124 stored in the in-vehicle digital TV receiving system 1000 and the in-vehicle digital TV receiving system 1000 mounted in another vehicle. The position information / reception status information table 2124 is shared by inter-vehicle communication.

With this configuration, as shown in FIG. 33, position information / reception status information acquired from another vehicle can be provided to a vehicle different from the other vehicle. For example, the in-vehicle digital TV receiver system 1000 _2-vehicle digital TV by performing reception system 1000 ₃ and the inter-vehicle communication, acquires the vehicle digital TV information stored in the position information / reception status information table 2124 of the receiving system 1000 ₃ To do. Then, the vehicle-mounted digital TV receiver system 1000 _1, by performing the in-vehicle digital TV receiver system 1000 ₂ and the inter-vehicle communication, vehicle digital TV receiver system 1000 ₂ and the in-vehicle digital TV receiver system 1000 _third position information / reception status information table The information stored in 2124 can be acquired. That is, the in-vehicle digital TV receiving system 1000 ₁ can acquire information from a plurality of hop destinations.

(Eleventh embodiment)
An in-vehicle digital TV receiving system according to an eleventh embodiment of the present invention will be described.

  The configuration of the in-vehicle digital TV receiving system 1000 according to the present embodiment is the same as the in-vehicle digital TV receiving system described above.

  The in-vehicle digital TV receiving system 1000 according to the present embodiment adds a reliability coefficient indicating the correlation between the previously acquired error rate and the currently acquired error rate when overlappingly acquiring position information and error rate information. And store. This reliability coefficient is a small value when the error rate acquired last time and the error rate acquired this time are largely different in the same channel. On the other hand, this reliability coefficient becomes a large value when the previously acquired error rate is close to the currently acquired error rate in the same channel.

  In this case, when performing a route search, the CPU 202 may obtain a product of an error rate and a reliability coefficient and obtain a metric based on the product.

  For example, as shown in FIG. 34, error rate information at each position is stored in the position information / reception status information table 2124. The position information / reception status information table 2124 stores reliability coefficients. The reliability coefficient is classified into a plurality of reliability levels. For example, the reliability coefficient is classified into five levels in ascending order of reliability.

  Here, error rate information is acquired at positions A, B, and D.

  The CPU 202 obtains an average value with the error rate information stored in the position information / reception status information table based on the acquired position information and error rate information, and stores the average value. Then, the CPU 202 obtains a reliability coefficient based on the previously acquired error rate information and the currently acquired error rate information.

  According to the present embodiment, it is possible to reduce the influence of an abnormal value acquired under an abnormal environment, a level difference due to a difference in the position where the data was acquired, and a variation due to being acquired under a noisy environment. Can do. In addition, it is possible to select a route with higher reliability over a route with lower reliability.

(Twelfth embodiment)
An in-vehicle digital TV receiving system according to the twelfth embodiment of the present invention will be described.

  The configuration of the in-vehicle digital TV receiving system 1000 according to the present embodiment is the same as the in-vehicle digital TV receiving system described above.

  The in-vehicle digital TV receiving system 1000 according to the present embodiment notifies the viewer when the channel currently being viewed approaches the area where the reception status is poor.

  According to the present embodiment, the reception status is deteriorated for the viewer without performing route search using the reception status information or predicting the time passing through each position and displaying the reception status on the electronic program guide. Can be notified. For this reason, the circuit can be simplified. In addition, the viewer can avoid beforehand a situation in which the channel being viewed suddenly becomes unviewable.

  For convenience of explanation, specific numerical examples will be described to facilitate understanding of the invention. However, unless otherwise specified, these numerical values are merely examples, and any appropriate value may be used.

  Although the present invention has been described above with reference to specific embodiments, each embodiment is merely an example, and those skilled in the art will understand various variations, modifications, alternatives, substitutions, and the like. I will. For convenience of explanation, an apparatus according to an embodiment of the present invention has been described using a functional block diagram, but such an apparatus may be realized by hardware, software, or a combination thereof. The present invention is not limited to the above-described embodiments, and various modifications, corrections, alternatives, substitutions, etc. are included without departing from the spirit of the present invention.

It is a partial block diagram which shows the vehicle-mounted digital TV receiving system concerning one Example of this invention. It is a flowchart which shows operation | movement of the vehicle-mounted digital TV receiving system concerning one Example of this invention. It is explanatory drawing which shows the operation | movement in the vehicle-mounted digital TV receiving system concerning one Example of this invention. It is explanatory drawing which shows an example of the information acquired in the vehicle-mounted digital TV receiving system concerning one Example of this invention. It is a partial block diagram which shows the vehicle-mounted digital TV receiving system concerning one Example of this invention. It is a flowchart which shows operation | movement of the vehicle-mounted digital TV receiving system concerning one Example of this invention. It is explanatory drawing which shows the operation | movement in the vehicle-mounted digital TV receiving system concerning one Example of this invention. It is explanatory drawing which shows an example of the information acquired in the vehicle-mounted digital TV receiving system concerning one Example of this invention. It is a partial block diagram which shows the vehicle-mounted digital TV receiving system concerning one Example of this invention. It is a flowchart which shows operation | movement of the vehicle-mounted digital TV receiving system concerning one Example of this invention. It is explanatory drawing which shows the operation | movement in the vehicle-mounted digital TV receiving system concerning one Example of this invention. It is explanatory drawing which shows an example of the information acquired in the vehicle-mounted digital TV receiving system concerning one Example of this invention. It is explanatory drawing which shows an example of the information acquired in the server in the vehicle-mounted digital TV receiving system concerning one Example of this invention. It is explanatory drawing which shows an example of the information acquired in the vehicle-mounted digital TV receiving system concerning one Example of this invention. It is a partial block diagram which shows the vehicle-mounted digital TV receiving system concerning one Example of this invention. It is a flowchart which shows operation | movement of the vehicle-mounted digital TV receiving system concerning one Example of this invention. It is explanatory drawing which shows the operation | movement in the vehicle-mounted digital TV receiving system concerning one Example of this invention. It is explanatory drawing which shows an example of the information acquired in the vehicle-mounted digital TV receiving system concerning one Example of this invention. It is explanatory drawing which shows an example of the information acquired in the vehicle-mounted digital TV receiving system concerning one Example of this invention. It is explanatory drawing which shows an example of the information acquired in the vehicle-mounted digital TV receiving system concerning one Example of this invention. It is explanatory drawing which shows an example of the information acquired in the vehicle-mounted digital TV receiving system concerning one Example of this invention. It is explanatory drawing which shows operation | movement of the vehicle-mounted digital TV receiving system concerning one Example of this invention. It is explanatory drawing which shows operation | movement of the vehicle-mounted digital TV receiving system concerning one Example of this invention. It is explanatory drawing which shows an example of the information acquired in the vehicle-mounted digital TV receiving system concerning one Example of this invention. It is explanatory drawing which shows an example of the information acquired in the vehicle-mounted digital TV receiving system concerning one Example of this invention. It is explanatory drawing which shows an example of the information acquired in the vehicle-mounted digital TV receiving system concerning one Example of this invention. It is explanatory drawing which shows operation | movement of the vehicle-mounted digital TV receiving system concerning one Example of this invention. It is explanatory drawing which shows an example of the information acquired in the vehicle-mounted digital TV receiving system concerning one Example of this invention. It is explanatory drawing which shows operation | movement of the vehicle-mounted digital TV receiving system concerning one Example of this invention. It is explanatory drawing which shows operation | movement of the vehicle-mounted digital TV receiving system concerning one Example of this invention. It is explanatory drawing which shows operation | movement of the vehicle-mounted digital TV receiving system concerning one Example of this invention. It is explanatory drawing which shows operation | movement of the vehicle-mounted digital TV receiving system concerning one Example of this invention. It is explanatory drawing which shows operation | movement of the vehicle-mounted digital TV receiving system concerning one Example of this invention. It is explanatory drawing which shows an example of the information acquired in the vehicle-mounted digital TV receiving system concerning one Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Digital television tuner 102 RF (radio frequency) part 104 OFDM (Orthogonal Frequency Division Multiplexing) demodulation part 106 Error correction part 108 Demultiplexer 110 Decoding part 150 Digital television tuner 152 RF (radio frequency) part 154 OFDM (Orthogonal Frequency Division Multiplexing) Demodulator 156 Error corrector 200 Navigation system 202 CPU (Central Processing Unit)
204 ROM (Read Only Memory)
206 RAM (Random Access Memory)
208 I / O (Input / Output)
210 I / F (interface)
212 HDD (Hard Disk Drive)
214 Image processing unit 216 Audio processing unit 218 Bus 2122 Map data 2124 Location information / reception status information table 2126 Location information / reception status information data primary storage unit 300 Display unit 400 Speaker 500 GNSS (Global Navigation Satellite System) receiver 600 Gyro sensor 700 Vehicle speed sensor 800 Data communication system (DCM)
802 RF (radio frequency) unit 804 Baseband processing unit 850 Inter-vehicle communication system 852 RF (radio frequency) unit 854 Baseband processing unit 900 Server 902 Signal processing unit 904 Data processing unit 906 Location information / reception status information database 1000 (1000 ₁ , 1000 ₂ , 1000 ₃ ) In-vehicle digital TV reception system

Claims (13)

An in-vehicle digital TV receiving system that is mounted on a mobile body and receives a digital television broadcast,
Reception quality measuring means for measuring the reception quality of the digital television broadcast;
Reception quality storage means for storing the reception quality measured by the reception quality measurement means together with position information;
A reception quality notification means for notifying the reception quality in the travel route based on the position information and the reception quality stored in the reception quality storage means;
Acquisition means for acquiring position information and reception quality possessed by other vehicles,
The in-vehicle digital TV reception system, wherein the reception quality storage means stores position information and reception quality that are not stored among position information and reception quality of the other vehicle. The in-vehicle digital TV receiving system according to claim 1,
The in-vehicle digital TV receiving system, wherein the reception quality measuring means measures an error rate of the digital television broadcast. The in-vehicle digital TV receiving system according to claim 2,
The in-vehicle digital TV reception system, wherein the reception quality storage means stores the reception quality together with position information for each time when the error rate of the digital television broadcast is assumed to change. The in-vehicle digital TV receiving system according to any one of claims 1 to 3,
The in-vehicle digital TV receiving system, wherein the reception quality storage means stores the reception quality measured by the reception quality measurement means together with channel information. The in-vehicle digital TV receiving system according to any one of claims 1 to 4,
The in-vehicle digital TV receiving system, wherein the reception quality measuring means measures reception quality of a plurality of channels. The in-vehicle digital TV receiving system according to any one of claims 1 to 5,
The in-vehicle digital TV receiving system characterized in that the acquisition means acquires position information and reception quality possessed by another vehicle by inter-vehicle communication. The in-vehicle digital TV receiving system according to any one of claims 1 to 5,
The in-vehicle digital TV receiving system characterized in that the acquisition means acquires position information and reception quality by communicating with a server storing position information and reception quality acquired by a plurality of vehicles. The in-vehicle digital TV receiving system according to any one of claims 1 to 7,
Points used as location information common to all cars are set,
The in-vehicle digital TV reception system, wherein the reception quality storage means stores position information of the nearest point as position information. The in-vehicle digital TV receiving system according to any one of claims 1 to 8,
When the reception quality is acquired at the position, the reception quality storage unit stores an average of the acquired reception quality and the reception quality acquired this time. The in-vehicle digital TV receiving system according to any one of claims 1 to 9,
Classification means for classifying the reception quality measured by the reception quality measurement means;
The in-vehicle digital TV reception system, wherein the reception quality storage means stores the reception quality classified by the classification means together with position information. The in-vehicle digital TV receiving system according to claim 10,
Route search means for searching for a route based on the classified reception quality,
The in-vehicle digital TV receiving system, wherein the reception quality notifying unit notifies the route searched by the route searching unit. The in-vehicle digital TV receiving system according to any one of claims 1 to 11,
An estimated arrival time calculating means for obtaining an estimated arrival time at an arbitrary point on the travel route;
The in-vehicle digital TV receiving system characterized in that the reception quality notification means notifies the estimated arrival time obtained by the estimated arrival time calculation means. The in-vehicle digital TV receiving system according to claim 12,
The in-vehicle digital TV reception system, wherein the reception quality notification means notifies reception quality at an arrival point.

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