JP2005311435A - Broadcast receiver for moving object and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide high-quality broadcast content to a user as much as possible even if the broadcast content cannot be properly received in a broadcast receiver for a moving object to be mounted on the moving object. <P>SOLUTION: If receiving condition of terrestrial digital broadcasting is good (S110: good), a real time stamp indicating a real broadcasting time is added to its video/audio signal per packet and it is stored in an HDD (S120). On the contrary, if the reception condition is bad (S110: bad), a portion in which the receiving condition is not good is not stored in the HDD, content data (video data) indicating the same contents as the portion are acquired from a TV distribution server, a time stamp is added to the acquired video data per packet, and the data are stored in the HDD (S130). Then, the video/audio signal and the video data stored in the HDD are read in time series while referring to the time stamp, and outputted to a display (S220). <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a mobile broadcast receiving apparatus mounted on a mobile body, and relates to a technology for providing users with high-quality broadcast content as much as possible even when broadcast content transmitted from a broadcast station cannot be properly received.

Conventionally, an in-vehicle digital television receiver capable of receiving terrestrial digital broadcasting by a moving body such as a vehicle is known.
Among such in-vehicle digital television receivers, in order to suitably execute data reception processing even if the reception state of transmission data temporarily deteriorates, a plurality of layers received from a terrestrial digital television broadcast station Some of the demodulated MPEG data are selected and reproduced. Specifically, when it is determined that the demodulated MPEG of the A layer is normally received, the demodulated MPEG data of the A layer is output, while the demodulated MPEG data of the A layer is abnormal and the demodulated MPEG data of the B layer is normal. In such a case, the normal B-layer demodulated MPEG data is output (see, for example, Patent Document 1).
JP 2002-369254 A (4th and 5th pages, FIGS. 4 and 5)

  However, in the on-vehicle digital television receiver as described above, for example, all the received demodulated MPEG data in a plurality of layers may be abnormal depending on the position of the moving object. There was a problem that the output state deteriorated, for example, the output screen was distorted and the sound could not be heard.

  The above-mentioned problems are not limited to receiving terrestrial digital television broadcasts. For example, analog broadcasts are received, broadcast contents are received via ground base stations, and artificial broadcasts are received. The same problem is considered to occur when receiving via satellite.

  The present invention has been made in view of such problems, and the object of the present invention is to be unable to appropriately receive broadcast content transmitted from a broadcast station in a mobile broadcast receiver mounted on a mobile object. Even in the state, it is to provide users with high-quality broadcast content as much as possible.

  In order to solve the above-mentioned problems, the mobile broadcast receiving apparatus according to claim 1 (1: In this section, in order to facilitate understanding of the invention, the "best mode for carrying out the invention is described as necessary." Is attached to the mobile body, and the broadcast content receiving means (11) and the broadcast content detour acquisition means are attached. (12, 13). Among these, the broadcast content receiving means can receive the broadcast content transmitted from the broadcast station, while the broadcast content detour obtaining means transmits the content data indicating the same content as the above-mentioned broadcast content to the mobile communication network (20 , 21, 23). Then, the reception status of the broadcast content by the broadcast content receiving means is detected by the reception status detection means (14), and the control means (14) performs the following control based on the detected reception status. In other words, if the broadcast content can be properly received, the control means stores the broadcast content received by the broadcast content receiving means in the storage means (15). On the other hand, if the broadcast content cannot be properly received, the content data corresponding to the portion that cannot be properly received in the broadcast content is acquired by the broadcast content detour acquisition unit and stored in the storage unit. Then, the control means causes the output means (16) to output the broadcast content and the content data stored in the storage means in the order of the actual broadcast time.

  The present invention as described above is made from the following viewpoints. In other words, with regard to receiving broadcasts on mobiles, digital broadcasts are preferable to analog broadcasts from the viewpoint of providing high-quality broadcast content to users, and mobile communication networks are used today as infrastructure has advanced. It is desirable to acquire content data indicating the same content as the broadcast content. Here, the broadcast content transmitted from the broadcast station is characterized in that the number of installed base stations is small and the radio field intensity at each base station is strong, so that broadcast content can be received over a wide range, The reception situation is easily affected by the distance from the base station and the topography. In addition, the content data that can be acquired via the mobile communication network is characterized by the large number of installed base stations and the weak radio field strength at each base station. Can be received, but the reception status of the content data is good in a place where radio waves can be received. Therefore, in consideration of the characteristics of the broadcast content transmitted from the broadcast station as described above and the content data that can be acquired via the mobile communication network, the mobile receiving device focuses on stable reception of the broadcast content. If the broadcast content transmitted from the broadcast station is received and the above-mentioned broadcast content is complemented by using a mobile communication network to transmit and receive various information, the service to the user is provided. It is preferable from the viewpoint of provision. In view of the above, the present invention is configured as follows in consideration of the fact that, in addition to the reasons described above, communication costs are currently incurred in acquiring content data using a mobile communication network. That is, in the present invention, normally, broadcast content from a broadcast station is received, and if the reception state is not good, a portion in which the reception state in the broadcast content from the broadcast station is not good using a mobile communication network is complementary. Configured to get to. As a result, it is possible to provide the user with broadcast content of high quality as much as possible with respect to broadcast reception on a mobile object.

  Note that the reception status of broadcast content may be, for example, a bit error rate or reception electric field level (signal strength: RSSI) when demodulating received data by terrestrial digital broadcasting, and the broadcast content is appropriately determined based on these. It can be determined whether or not reception is possible. In addition, about the reference value of the determination, it is possible to set the received broadcast content so that it is easy to see and listen to the user.

  Note that the broadcast content received by the broadcast content receiving means may be analog broadcast content or digital broadcast content. As for the broadcast content receiving means, the broadcast content transmitted from the broadcast station may be received via the ground base station. Specifically, it is terrestrial analog broadcasting or terrestrial digital broadcasting. The broadcast content receiving means may receive broadcast content transmitted from a broadcast station via an artificial satellite. Specifically, BS (broadcast satellite) analog broadcasting, BS digital broadcasting, CS (communications satellite) digital broadcasting, and the like.

  By the way, since the broadcast content cannot be properly received as described above, the content data cannot be acquired by the broadcast content bypass acquisition unit when the content data is acquired from the mobile communication network by the broadcast content bypass acquisition unit. is there. In such a case, it is conceivable that the broadcast content received by the broadcast content receiving means is output from the output means although it cannot be properly received. By this, low-quality broadcast content is provided to the user. become. Therefore, as described in claim 2, when the content data cannot be properly acquired by the broadcast content bypass acquisition unit, the control unit may not output the content data. As an example, there are a case where content data cannot be acquired by the broadcast content bypass acquisition means, or a case where content data can be acquired but the acquisition state is not good and the quality is low. In this way, it is possible to prevent providing low-quality broadcast content to the user.

  Similarly, when content data is acquired from the mobile communication network by the broadcast content bypass acquisition means because the broadcast content cannot be properly received, the response of the server of the mobile communication network is slow and the acquisition of the content data May take time. In such a case, since the broadcast content and content data waiting to be output already stored in the storage means are output and new content data cannot be acquired, the storage amount of the broadcast content and content data stored in the storage means is reduced. The output may not be continued. Therefore, it is conceivable to output the broadcast content and content data waiting for output in advance from the actual broadcast time. Specifically, as in claim 3, the control means causes the output means to output the broadcast content and the content data stored in the storage means as described above after the reproduction delay time has elapsed from the actual broadcast time. It is possible. Note that the playback delay time described above may be set by the user, or may be set in consideration of the time required to acquire broadcast content by the broadcast content detour acquisition means. In this way, output of broadcast content and content data can be continued at least during the reproduction delay time even if acquisition of content data by the broadcast content bypass acquisition means is delayed.

  It should be noted that the time required to acquire the content data by the broadcast content bypass acquisition means is considered to change depending on the access status to the mobile communication network, the surrounding environment, the time zone, and the like. Therefore, it is conceivable that the control means changes the reproduction delay time according to the situation (claim 4). For example, the length of the reproduction delay time is periodically reviewed in consideration of the response time from the mobile communication network in the past. By adjusting the playback delay time in this way, for example, the output of broadcast content and content data due to the fact that the playback delay time is longer than necessary with respect to the response time or the playback delay time is shorter than the response time. Can be prevented from being interrupted.

  In order to lengthen the reproduction delay time as described above, it is conceivable that the control means increases the storage amount of the broadcast content in the storage means as in the fifth aspect. Specifically, it is conceivable that the control unit stops the output of the terrestrial digital broadcast and controls the broadcast content bypass acquisition unit to acquire the broadcast content. In addition, when increasing the storage amount of the broadcast content and content data in the storage unit while continuing to output the broadcast content and content data stored in the storage unit, the control unit controls the broadcast content bypass acquisition unit. Therefore, it is necessary to acquire the content data at a higher speed than the transmission speed of the broadcast content by the broadcasting station.

  On the other hand, when shortening the reproduction delay time described above, it is conceivable that the control means reduces the storage amount of the broadcast content and the content data in the storage means, as in claim 7. For example, the control unit compresses the broadcast content and content data stored in the storage unit and outputs the compressed content to the output unit faster than the transmission speed of the broadcast content by the broadcast station. ).

  Note that, as shown in claim 9, the control means in the mobile broadcast receiver according to any one of claims 1 to 8 can be realized as a program that causes a computer to function. Therefore, the present invention can be realized as a program invention. In the case of such a program, for example, the program is recorded on a computer-readable recording medium such as an FD, MO, DVD-ROM, CD-ROM, or hard disk, and is used by being loaded into a computer and started up as necessary. be able to. In addition, the ROM or backup RAM may be recorded as a computer-readable recording medium, and the ROM or backup RAM may be incorporated into the computer for use.

  Embodiments to which the present invention is applied will be described below with reference to the drawings. The embodiments of the present invention are not limited to the following examples, and can take various forms as long as they belong to the technical scope of the present invention.

  FIG. 1 is a schematic configuration diagram of a mobile broadcast receiver 1 according to an embodiment. FIG. 2 is an explanatory diagram showing the relationship between the signal level and the reception quality in terrestrial digital television broadcasting, and FIG. 3C is an explanatory diagram explaining the storage contents of the HDD.

[Description of Configuration of Mobile Broadcast Receiver 1]
As shown in FIG. 1, the mobile broadcast receiver 1 is a device that is mounted on a mobile body such as a vehicle and receives terrestrial digital television broadcasts. 12, an Internet communication unit 13, a control device 14, an HDD 15, a display 16, a channel selection control unit 17, and a channel selection operation reception unit 18.

  Here, the above-mentioned “terrestrial digital broadcasting” will be described. The digital broadcast received by the mobile broadcast receiver 1 is a terrestrial digital television broadcast, and is fixed by broadcasting a terrestrial digital television broadcast wave from a transmitting station such as a television tower as shown in FIG. Broadcasts and mobile broadcasts. Specifically, terrestrial digital television broadcasting for fixed use can provide a relatively clear image because of the high bit rate compressed by the MPEG2 standard, while terrestrial digital television broadcasting for mobiles is based on the MPEG4 standard. Due to the low bit rate compressed by, it is suitable for reception on mobiles. FIG. 2A shows the difference between the reception of the fixed broadcast and the reception of the mobile broadcast in relation to the signal level and the video / audio reception quality. In the following description, the terrestrial digital TV broadcast for fixed use and the terrestrial digital TV broadcast for mobile object may be simply referred to as “fixed broadcast” and “mobile broadcast”, respectively.

  As shown in FIG. 2 (a), when receiving a broadcast for mobiles, unlike the case of receiving a broadcast for fixed use, the video / audio quality is poor due to a resolution problem because it is transmitted at a low bit rate. However, since the signal can be received even if the signal level is low (that is, the received radio wave is weak), it can be said that it is suitable for reception by a receiving device mounted on a moving body such as a vehicle. However, even if the mobile broadcast receiving apparatus 1 is used by being mounted on a mobile body such as a vehicle, it is not always possible to receive only a digital broadcast intended for the mobile body. For example, it may be assumed that a fixed digital broadcast can be received when the vehicle stops or travels at a low speed. Furthermore, even in a traveling state that cannot be said to be a low-speed traveling, reception may be possible depending on the surrounding environment. Therefore, it is preferable to receive a relatively high-quality fixed broadcast if reception is possible, and to receive a mobile broadcast if reception is impossible.

[Description of Configuration of Terrestrial Signal Receiver 11]
The terrestrial signal receiver 11 is a device for receiving a fixed terrestrial digital broadcast and a mobile terrestrial digital broadcast, and includes a front end for receiving a broadcast signal from an antenna (not shown), a demodulator, A decoder and the like (both not shown) are provided. In addition, in the broadcast wave at the time of input to the terrestrial signal receiver 11, in the case of simulcast, a fixed broadcast signal and a mobile broadcast signal are included in the same channel. The demodulator and decoder are configured to receive, demodulate, and decode broadcasts for mobiles.

  Here, the front end is tuned to a predetermined channel frequency based on a channel selection control signal from the channel selection control unit 17, and is converted and amplified to an intermediate frequency. The front end also has a function of detecting a level change (received electric field strength) of a TV broadcast signal based on the signal level of the intermediate frequency, and a signal indicating the detection result of the received electric field strength is signal strength information (RSSI). To the control device 14. The demodulator is a demodulator / decoder for the TV broadcast signal, which demodulates the broadcast signal in synchronization with the broadcast signal, performs error detection and correction, and then decodes the transport stream (Transport Stream: TS ) To the decoder. Note that the demodulator may detect the bit error rate (BER) before and after error correction and output information indicating the detected bit error rate to the control device 14. The decoder is a processing unit that converts a TS into a video / audio signal, and is also a part that decrypts an encrypted TS signal such as a pay broadcast based on a decryption encryption key. The video / audio signal (broadcast content) thus converted by the terrestrial signal receiver 11 is output to the control device 14.

The terrestrial signal receiver 11 corresponds to broadcast content receiving means.
[Description of Configuration of Wireless Communication Device 12 and Internet Communication Unit 13]
The wireless communication device 12 is configured to be able to communicate with the TV distribution server 23 via the base station 20 and the Internet 21. In addition, as a frequency band when this radio | wireless communication apparatus 12 communicates with the base station 20, the frequency band (for example, 800 MHz band, 1.5 GHz band) utilized for mobile communications, such as a mobile telephone, is mentioned. It is done.

  The Internet communication unit 13 also transmits information indicating that video data is requested to the TV distribution server 23 via the wireless communication device 12 and acquires the video data transmitted from the TV distribution server 23. have. Here, as a specific example of the video data, there is content data showing the same content as the broadcast content of terrestrial digital broadcasting. Further, the Internet communication unit 13 has a function of outputting the video data acquired as described above to the control device 14. The wireless communication device 12 and the Internet communication unit 13 correspond to broadcast content detour acquisition means.

[Description of Configuration of HDD 15]
The HDD 15 is composed of a non-volatile memory, and is used to store the above-described video / audio signals and video data. Here, the video / audio signal and the video data stored in the HDD 15 are composed of a plurality of data subdivided in units of packets as illustrated in FIG. Note that “terrestrial wave” in FIG. 3C indicates data constituting the video / audio signal of the terrestrial digital broadcast received by the terrestrial signal receiver 11, and “server” is Internet communication. The video data acquired by the unit 13 is shown. Each signal / data is given a time stamp indicating the actual broadcast time, and the original broadcast content can be reproduced by arranging the above signals / data in time series based on these time stamps. it can. The HDD 15 corresponds to a storage unit.

[Description of Configuration of Display 16]
The display 16 has a display unit for displaying video signals and video data, a speaker for reproducing audio included in the video / audio signals and video data, and a mechanism for controlling display control and audio output. The video / audio signal and video data input from the control device 14 are displayed on the display unit or output from the speaker. The display 16 corresponds to output means.

[Description of configurations of channel selection control unit 17 and channel selection operation reception unit 18]
The channel selection control unit 17 performs channel selection control by outputting a channel selection control signal to the front end in the terrestrial signal receiver 11. The channel selection control can be performed based on an operation from the user received by the channel selection operation reception unit 18, or can be performed based on a determination result obtained from the control device 14. When performing based on an operation from the user, when the user designates a broadcasting station to be received by operating the channel selection operation accepting unit 18, the channel selection control unit 17 determines the broadcasting station based on the command. A channel selection control signal for selecting a broadcast signal is output to the front end in the terrestrial signal receiver 11. The front end selects a designated broadcast signal according to the channel selection control signal.

[Description of Configuration of Control Device 14]
The control device 14 is configured around a known microcomputer including a CPU, a ROM, a RAM, an I / O, a bus line connecting these configurations, and the like. Based on a program stored in the ROM and the RAM, By controlling the channel selection control unit 17, it has a function of executing the above-described music selection control. Further, the control device 14 has a function of determining the reception status based on the reception intensity signal obtained from the terrestrial signal receiver 11. Note that the reference value for the determination is set so that the received digital terrestrial broadcast is easy to see and hear for the user. Further, it may be determined whether the mobile broadcast can be received based on reception status data such as BER instead of the reception intensity signal. Further, based on the determined reception status, the control device 14 determines the actual broadcast time of the video / audio signal received by the terrestrial signal receiver 11 in units of packets if the terrestrial digital broadcast can be properly received. Is stored in the HDD 15. If the digital terrestrial broadcast cannot be properly received, the video data is acquired from the TV distribution server 23 by controlling the wireless communication device 12 and the Internet communication unit 13. The acquired video data is stored in the HDD 15 with a time stamp attached to each packet. This function corresponds to video data storage processing described later. Further, as illustrated in FIG. 3C, the control device 14 outputs the video / audio signal and the video data stored in the HDD 15 to the display 16 with a reproduction delay time T delayed to display the video or the audio. Has a function of playing back. Here, the reproduction delay time T is set to 10 seconds in this embodiment. This function corresponds to a video data output process described later.

The control device 14 corresponds to reception status detection means and control means.
[Description of configuration of TV distribution server 23]
Incidentally, the TV distribution server 23 shown in FIG. 1 is mainly configured by a known microcomputer including a CPU, a ROM, a RAM, an I / O, a bus line connecting these components, and the like. The TV distribution server 23 stores video data such as content data showing the same content as broadcast content of terrestrial digital broadcasting, for example. The TV distribution server 23 forms a mobile communication network together with the Internet 21 and the base station 20, and communicates with the wireless communication device 12 of the mobile broadcast receiver 1 via the Internet 21 and the base station 20. It has a function to do. Furthermore, the TV distribution server 23 has a function of transmitting the above-described video data to the mobile broadcast receiver 1 in units of packets in response to a request from the mobile broadcast receiver 1.

[Description of video data saving process]
Next, video data storage processing executed by the control device 14 of the mobile broadcast receiver 1 will be described with reference to the flowchart of FIG.

This process is executed for the broadcast content of the selected broadcast station when an accessory power supply (not shown) is turned on and power is supplied to the mobile broadcast receiver 1.
First, in the first step S110, it is determined whether terrestrial digital broadcasting can be received. Specifically, it is determined whether or not the radio wave condition of the mobile broadcast is good based on reception intensity data (RSSI) obtained from the terrestrial signal receiver 11 and reception status data such as BER.

  Here, when the radio wave condition is good (S110: good), the terrestrial signal receiver 11 is controlled to receive the terrestrial digital broadcast broadcast content (video / audio signal), and the received video / audio signal is received. Are stored in the HDD 15 with a time stamp indicating the actual broadcast time in packet units (S120). And it returns to S110 and repeats the process below S110.

  On the other hand, if the radio wave condition is not good (S110: bad), the content of the received broadcast content (video / audio signal) where the radio wave condition is not good is not stored in the HDD 15 and the same content as that part is stored. Data (video data) is requested to the TV distribution server 23 via the wireless communication device 12, the base station 20, and the Internet by controlling the Internet communication unit 13. Then, the video data transmitted from the TV distribution server 23 is acquired, and the acquired video data is stored in the HDD 15 with a time stamp indicating the actual broadcast time in units of packets (S130). And it returns to S110 and repeats the process below S110.

[Description of video data output processing]
Next, video data output processing executed by the control device 14 of the mobile broadcast receiver 1 will be described with reference to the flowchart of FIG.

  This process is executed independently of the above-described video data storage process for the broadcast content of the selected broadcast station when an accessory power supply (not shown) is turned on and power is supplied to the mobile broadcast receiver 1.

  First, in the first step S210, it is determined whether or not the broadcast content (video / audio signal and video data) of the broadcasting station selected based on the tuning control signal from the tuning control unit 17 is stored in the HDD 15. To do. If stored here (S210: Yes), the video / audio signal and video data are read out in time series from the HDD 15 with reference to the time stamp attached to each data, and the read video / audio is read out. The signal and the video data are sequentially output to the display 16 with a reproduction delay time T delayed from the actual broadcast time (S220). At this time, the display 16 displays the video / audio signal and video data input from the control device 14 on the display unit or outputs them from the speaker. And it returns to S210 and repeats the process after S210.

  On the other hand, if not stored (S210: None), output to the display 16 is interrupted (S230). At this time, since the video / audio signal and video data from the control device 14 are not input to the display 16, the display on the display unit and the output from the speaker are not performed. And it returns to S210 and repeats the process after S210.

[effect]
Thus, according to the broadcast receiver 1 for mobile bodies of an Example, there exist the following effects. That is, when the reception state of the terrestrial digital broadcast is good (S110: good), the video / audio signal is attached with a time stamp indicating the actual broadcast time in packet units and stored in the HDD 15 (S120), If the reception state of the terrestrial digital broadcast is not good (S110: bad), the portion of the received broadcast content (video / audio signal) where the radio wave state is not good is not stored in the HDD 15, and the same content as that portion Is acquired from the TV distribution server 23, and the acquired video data is attached to the HDD 15 with a time stamp indicating the actual broadcast time in packet units (S130). Then, the video / audio signal and video data stored in the HDD 15 are read in time series with reference to the time stamp and output to the display 16 (S220). In this way, terrestrial digital broadcasting is normally received, and if the reception state is not good, the part where the reception state in terrestrial digital broadcasting is not good is acquired complementarily using a mobile communication network. Therefore, it is possible to provide the user with high-quality broadcast content as much as possible with respect to digital broadcast reception on a mobile body.

  In addition, according to the mobile broadcast receiver 1 of the embodiment, the control device 14 outputs the broadcast content stored in the HDD 15 to the display 16 with a reproduction delay time T delayed to display video or reproduce audio. Therefore, even if the acquisition of the broadcast content from the TV distribution server 23 is delayed, the output of the broadcast content can be continued at least during the reproduction delay time T.

[Another embodiment]
(1) The terrestrial signal receiver 11 of the above-described embodiment is configured to receive, demodulate, and decode broadcasts for mobiles, but is not limited to this. Decoding may be performed, or reception / demodulation / decoding of mobile broadcasts and reception / demodulation / decoding of fixed broadcasts may be performed to select a better reception state.

  In the mobile broadcast receiving apparatus of the above embodiment, the terrestrial digital broadcast is normally received, and if the reception state is not good, the reception state in the terrestrial digital broadcast is good using the mobile communication network. It is configured to acquire the part that is not complementary, but is not limited to this, instead of receiving terrestrial digital broadcasting, terrestrial analog broadcasting, BS analog broadcasting, BS digital broadcasting, CS digital broadcasting, etc. If the reception state is not good, the mobile communication network may be used to supplementarily acquire the portion where the reception state in the broadcast is not good.

  (2) The wireless communication device 12 of the above-described embodiment is configured to be able to transmit and receive various information to and from the base station 20 using a frequency band used for mobile communication such as a mobile phone, but is not limited thereto. Instead, for example, a frequency band (for example, 2.4 GHz band, 5 GHz band) used in a wireless LAN or the like may be used.

  (3) In the video data storage process and video data output process of the above embodiment, if the reception state of the broadcast content of the terrestrial digital broadcast is not good (S110: bad), the control device 14 receives the received broadcast. A portion of the content (video / audio signal) where the radio wave condition is not good is not stored in the HDD 15, and content data (video data) indicating the same content as that portion is acquired from the TV distribution server 23, and the acquired video The data is added with a time stamp indicating the actual broadcast time in packet units and stored in the HDD 15. However, the present invention is not limited to this, and the video / audio signal is stored in the HDD 15 and stored in the HDD 15 as described above. The output of the video / audio signal and the video data to the display 16 may be interrupted. In this way, it is possible to prevent providing low-quality broadcast content to the user.

  (4) In the above embodiment, the reproduction delay time T is set to 10 seconds, but the present invention is not limited to this, and the user may set it. Further, it may be set in consideration of the time required for the wireless communication device 12 and the Internet communication unit 13 to acquire video data from the TV distribution server 23. Even if comprised in this way, there exists an effect similar to the said Example.

  (5) Further, the reproduction delay time T may be changed according to the situation. As an example, the length of the reproduction delay time T is periodically reviewed in consideration of the acquisition time of video data from the TV distribution server 23 in the past, for example. In this way, even if the time required to acquire broadcast content from the TV distribution server 23 changes, for example, the reproduction delay time T is longer than necessary with respect to the acquisition time, or the reproduction is performed with respect to the acquisition time. It is possible to prevent the output of broadcast content from being interrupted due to the short delay time T.

  (5-1) In order to increase the reproduction delay time T, it is conceivable to use the following method. That is, it is conceivable that the control device 14 increases the storage amount of broadcast content stored in the HDD 15. Specifically, the control device 14 stops outputting the video / audio signal and the video data to the display 16 and controls the Internet communication unit 13 to acquire the video data from the TV distribution server 23. When the storage amount of the video / audio signal and video data to be stored in the HDD 15 is increased while the output of the video / audio signal and video data to the display 16 is continued, the acquisition of the video data by the Internet communication unit 13 is performed on the ground. It may be performed faster than wave digital broadcasting.

  (5-2) In order to shorten the reproduction delay time T, it is conceivable to use the following method. That is, it is conceivable that the control device 14 reduces the storage amount of the video / audio signal and video data stored in the HDD 15. Specifically, the control device 14 may compress the video / audio signals and video data stored in the HDD 15 and output them to the display 16 at a higher speed than terrestrial digital broadcasting.

  (6) In addition, when the acquisition of video data from the TV distribution server 23 is interrupted for, for example, the reproduction delay time T or more, or when the acquisition status of the video data from the TV distribution server 23 is not good, an instruction from the user The terrestrial signal receiver 11 may receive terrestrial digital broadcast broadcast contents (video / audio signals), store them in the HDD 15, and output them to the display 16. -Output of audio signals and video data may be interrupted. In addition, the terrestrial signal receiver 11 receives the terrestrial digital broadcast broadcast content (video / audio signal) and stores it in the HDD 15 while interrupting the output of the video / audio signal and video data to the display 16. When the acquisition of the video data from the TV distribution server 23 is resumed, the output of the video / audio signal and the video data to the display 16 may be resumed. In this way, it is possible to prevent providing low-quality broadcast content to the user.

  (7) When the channel to be received is changed by the music selection control, the broadcast content provided by the changed channel may not be stored in the HDD 15. Therefore, the control device 14 controls the terrestrial signal receiver 11 to receive the terrestrial digital broadcast broadcast content (video / audio signal), and outputs the received video / audio signal to the display 16. May be. In this case, when the radio wave condition of the terrestrial digital broadcast is poor, the control device 14 transmits the content data (video data) indicating the same content as the part with the poor radio wave condition in the received broadcast content (video / audio signal) to the TV. It may be obtained from the distribution server 23 and stored in the HDD 15, and output to the display 16 may be interrupted until the storage amount reaches the reproduction delay time T minutes. In this way, it is possible to prevent providing low-quality broadcast content to the user.

It is a schematic block diagram of the broadcast receiver for mobile bodies of an Example. It is explanatory drawing etc. which show the relationship between the signal level and reception quality in terrestrial digital television broadcasting. (a) is explanatory drawing which shows the video data preservation | save process which the control apparatus of the mobile broadcast receiver of an Example performs, (b) is the control apparatus of the broadcast receiver for mobile bodies of an Example It is explanatory drawing which shows the video data output process to perform, (c) is explanatory drawing explaining the memory content of HDD.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Broadcast receiver for mobile bodies, 11 ... Terrestrial signal receiver, 12 ... Wireless communication apparatus, 13 ... Internet communication part, 14 ... Control apparatus, 15 ... HDD, 16 ... Display, 17 ... Channel selection control part, 18 ... Channel selection operation reception unit, 20 ... Base station, 21 ... Internet, 23 ... TV distribution server

Claims (9)

A broadcast receiver for a mobile unit mounted on a mobile unit,
Broadcast content receiving means capable of receiving broadcast content transmitted from a broadcasting station;
Broadcast content bypass acquisition means capable of acquiring content data showing the same content as the broadcast content from a mobile communication network;
Reception status detection means for detecting the reception status of the broadcast content by the broadcast content reception means;
Storage means capable of storing the broadcast content received by the broadcast content receiving means and the content data acquired by the broadcast content detour acquisition means;
If the broadcast content can be properly received based on the reception status detected by the reception status detection means, the broadcast content received by the broadcast content reception means is stored in the storage means, while the broadcast content Broadcast data stored in the storage unit, the content data corresponding to the portion that cannot be properly received in the broadcast content is acquired by the broadcast content detour acquisition unit and stored in the storage unit. Control means for causing the output means to output the content and content data in the order of the actual broadcast time;
A broadcast receiving apparatus for mobile objects, comprising: The mobile broadcast receiver according to claim 1,
An acquisition status detection means for detecting the acquisition status of content data by the broadcast content bypass acquisition means,
The mobile broadcast is characterized in that the control means does not output the content data if the content data cannot be appropriately acquired based on the acquisition status of the content data detected by the acquisition status detection means. Receiver device. In the mobile broadcast receiver according to claim 1 or 2,
The mobile broadcast receiving apparatus according to claim 1, wherein the control means causes the output means to output the broadcast content and content data stored in the storage means after a reproduction delay time has elapsed from an actual broadcast time. In the broadcast receiver for mobile objects according to claim 3,
The mobile broadcast receiving apparatus, wherein the control means changes the reproduction delay time according to a situation. In the broadcast receiver for mobile objects according to claim 4,
When the control means sets the reproduction delay time to be longer than before, the control means increases the storage amount of the broadcast content and content data in the storage means. In the broadcast receiver for mobile objects according to claim 5,
The mobile broadcast receiving apparatus according to claim 1, wherein the control means controls the broadcast content bypass acquisition means to acquire the content data at a speed higher than a broadcast content transmission speed by the broadcast station. In the broadcast receiver for mobile objects according to claim 4,
When the control means sets the reproduction delay time to be shorter than before, the broadcast reception apparatus for mobile objects reduces the storage amount of the broadcast content and content data in the storage means. In the broadcast receiver for mobile objects according to claim 7,
The control unit compresses the broadcast content and content data stored in the storage unit and outputs the compressed content to the output unit, thereby reducing the storage amount of the broadcast content and content data in the storage unit. A mobile broadcast receiving apparatus.   The program for functioning a computer as a control means in the broadcast receiver for mobile bodies in any one of Claims 1-8.