JP6192155B2 - Receiving device, television, and recording device - Google Patents

Receiving device, television, and recording device Download PDF

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JP6192155B2
JP6192155B2 JP2013001287A JP2013001287A JP6192155B2 JP 6192155 B2 JP6192155 B2 JP 6192155B2 JP 2013001287 A JP2013001287 A JP 2013001287A JP 2013001287 A JP2013001287 A JP 2013001287A JP 6192155 B2 JP6192155 B2 JP 6192155B2
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signal
buffer
received
receiving device
broadcast
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JP2014135561A (en
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信広 權野
信広 權野
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株式会社アイ・オー・データ機器
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  The present invention relates to a receiving apparatus, a television, and a recording apparatus that receive a digital broadcast signal.

  When a receiving device receives a broadcast signal such as a digital broadcast from a broadcast station, the broadcast signal may be deteriorated due to radio wave interference, and images and sound may be disturbed. In order to cope with such deterioration of the broadcast signal, diversity technology is often used. Diversity refers to receiving the same broadcast signal with multiple antennas and preferentially using the signals that have been successfully received, or combining these received signals to remove noise to improve communication quality and reliability. This is a technology to improve. However, in diversity, since a plurality of antennas are often installed in the vicinity, there is a high possibility that they will receive the same radio interference. Therefore, in order to cope with radio wave interference, it is desirable to install a plurality of antennas as far apart as possible.

  The abstract of Patent Document 1 has as its subject “Providing a receiver that efficiently and reliably receives an information signal even when a wireless channel from a base station performing a multicast service is unstable”. As a means for solving the problem, “a wireless receiver using a complementary network that receives in a specific area a packet unit information signal transmitted wirelessly from a base station 1 that performs a multicast service, and that receives a plurality of information signals. The network 10 is constructed among the wireless receivers, and information signals including fragmented and incomplete packets received by the wireless receivers via the wireless communication device 24 are stored (storage device 23), and the stored information signals are stored. Are shared via the network 10, and the signal processing device 25 performs complementary signal processing under the control of the control device 22, so that the base station To restore the wirelessly transmitted information signal. Has been described as ".

JP 2002-141856 A

  According to the technique described in Patent Document 1, a plurality of wireless receivers that receive information signals construct a network 10. Thereby, the antennas of a plurality of radio receivers can be separated from each other. However, the technique described in Patent Document 1 is based on the assumption that other receivers are receiving the same broadcast signal. In other words, the case where other receivers receive signals from different broadcasting stations is not considered, and for example, this is not applicable to cases where broadcast signals are received from a plurality of broadcasting stations, such as digital terrestrial television broadcasting. .

  Therefore, an object of the present invention is to provide a receiving device, a television, and a recording device that can normally view a program even in an area where only a deteriorated broadcast signal can be received.

In order to solve the above-described problem, the invention described in claim 1 is a tuner that converts a broadcast signal received from a predetermined broadcast station into a first reception signal, and a first demodulation that demodulates the first reception signal. A processing unit; a first buffer that buffers a signal demodulated by the first demodulation processing unit; a communication unit that transmits / receives data via a network; and the first demodulation processing unit that receives the first reception If signal degradation is detected, a data request unit that requests a reception signal related to the predetermined broadcast station from another device connected to the network, and the first demodulation processing unit demodulates the first signal. A demodulation processing unit that demodulates a signal having the same format as the received signal by the same processing as the first demodulation processing unit, and that demodulates the second received signal received by the data request unit. And the second demodulation A second buffer for buffering the signal demodulated by the processing unit; and a time stamp of the signal at the end of the second buffer if a discontinuous portion is detected in the time stamp of the signal acquired from the first buffer. A complementary processing unit that discards the signal of the second buffer until the time stamp reaches the start time of the discontinuous portion, and then switches to the second buffer for output. It was set as the characteristic receiver.
Other means will be described in the embodiment for carrying out the invention.

  According to the present invention, it is possible to provide a receiving device, a television, and a recording device that can normally view a program even in an area where only a deteriorated broadcast signal can be received.

It is a figure which shows the structure of the system and the broadcast station list in the 1st Embodiment of this invention. It is a figure which shows the structure of the receiver of the 1st Embodiment of this invention. It is a flowchart of the virtual diversity process in the 1st Embodiment of this invention. It is a flowchart of the complementation process of the broadcast signal in the 1st Embodiment of this invention. It is a flowchart of the process of the server in the 1st Embodiment of this invention. It is a sequence diagram of the virtual diversity process in the 1st Embodiment of this invention. It is a flowchart of the virtual diversity process in the 2nd Embodiment of this invention. It is a flowchart of the process of the server in the 2nd Embodiment of this invention. It is a sequence diagram of the virtual diversity process in the 2nd Embodiment of this invention. It is a figure which shows the structure of the outline of the system in the 3rd Embodiment of this invention. It is a figure which shows the structure of the receiver in the 3rd Embodiment of this invention. It is a flowchart of the parent apparatus determination process of each receiving apparatus in the 3rd Embodiment of this invention. It is a flowchart of the parent apparatus determination process of the server in the 3rd Embodiment of this invention. It is a sequence diagram of the parent apparatus determination process in the 3rd Embodiment of this invention.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.

(First embodiment)
FIGS. 1A and 1B are diagrams showing the configuration of the system 1 and the broadcast station list 631 in the first embodiment of the present invention.
FIG. 1A is a schematic configuration diagram showing the system 1.
The system 1 includes a broadcasting station 5, a plurality of receiving apparatuses 2-1, 2-2,. .. And the server 6 are connected by a network 9. Note that the number of connected receivers 2-1, 2-2,... Is not limited to two, and may be any number.
The broadcasting station 5 broadcasts terrestrial digital television broadcasting, for example.
The network 9 is, for example, an Internet communication network, and can transmit and receive packets between a plurality of devices.
Each of the receiving devices 2-1, 2-2,... Has an antenna 21 and receives a broadcast signal from the broadcasting station 5 via the antenna 21. The IP (Internet Protocol) address of the receiving device 2-1 is “202.213.124.7”, and the IP address of the receiving device 2-2 is “202.213.128.5”. Hereinafter, the receiving devices 2-1, 2-2,.

The server 6 transmits and receives packets to and from each receiving device 2 via the network 9. The server 6 includes a communication unit 61, a broadcast station list management unit 62, and a storage unit 63.
The communication unit 61 is, for example, a network interface, and is hardware that transmits and receives packets via the network 9.
The storage unit 63 is, for example, an HDD (Hard Disk Drive), and stores programs and data. The storage unit 63 stores a broadcast station list 631 (see FIG. 1B).
The broadcast station list management unit 62 transmits / receives packets to / from each receiving device 2 via the network 9 and manages the broadcast station list 631. The broadcast station list management unit 62 is realized by a CPU (Central Processing Unit) (not shown) included in the server 6 executing a program.

FIG. 1B is a diagram showing a broadcast station list 631.
The broadcast station list 631 is a table in which information on a channel (broadcast station) selected by each receiver 2 and information on an IP address of a receiver that receives a broadcast signal of the channel (broadcast station) is recorded. It is.
The broadcasting station list 631 includes a broadcasting station column 631a and a receiving device address column 631b. The broadcast station column 631a stores identification information such as the broadcast station name or TSID (Transport Stream ID) of the selected channel (broadcast station). The address column 631b of the receiving device stores the IP address of the receiving device that receives the broadcast signal of the channel (broadcast station).

In the first row of the broadcast station list 631, “Broadcast station A” is stored in the broadcast station column 631a, and “202.213.124.7” is stored in the address column 631b of the receiving apparatus. “Broadcasting station A” is identification information of broadcasting station 5, and “202.213.124.7” is the IP address of the receiving device 2-1. The first line of the broadcast station list 631 indicates that the receiving apparatus 2-1 is currently receiving the channel of “Broadcast Station A”.
In the second row of the broadcast station list 631, “Broadcast station A” is stored in the broadcast station column 631a, and “202.213.128.5” is stored in the address column 631b of the receiving apparatus. “202.213.128.5” is the IP address of the receiving device 2-2 that receives the broadcast signal of the broadcast station 5. The second line of the broadcast station list 631 indicates that the receiving device 2-2 is currently receiving the channel of “broadcast station A”.

FIG. 2 is a diagram illustrating a configuration of the receiving device 2 according to the first embodiment of this invention.
The receiving device 2 includes an antenna 21, a tuner 22, an A / D converter 23, demodulation processing units 24a and 24b, demultiplexers 25a and 25b, video / audio signal buffers 26a and 26b, a selector 27, MPEG (Moving Picture Experts Group) A decoder 28, a display buffer 29, a virtual diversity unit 30, a complementary processing unit 31, and a communication unit 32 are provided. For example, the receiving device 2 is connected to the network 9 to transmit / receive packets to / from other devices, and is connected to the display device 4 to output video and audio.
The tuner 22 converts a selected channel of broadcast signals received from the broadcast station 5 via the antenna 21 into an analog signal and outputs the analog signal.
The A / D converter 23 converts the analog signal output from the tuner 22 into a digital signal that is a first reception signal and outputs the digital signal.

The demodulation processing unit 24a (first demodulation processing unit) includes a synchronization processing unit 241, a detection processing unit 242, and an error correction processing unit 243. The demodulation processing unit 24a demodulates the first reception signal output from the A / D conversion unit 23. The demodulation processing unit 24a performs OFDM (Orthogonal Frequency Division Multiplexing) demodulation processing on the first received signal that is a digital signal, and outputs a transport stream. A descrambler (not shown) for releasing the scramble of the transport stream is connected between the demodulation processing unit 24a and the demultiplexer 25a. The demodulation processing unit 24a notifies the virtual diversity unit 30 when error correction cannot be performed due to degradation of the first received signal. However, the present invention is not limited to this, and the demodulation processing unit 24a may notify the virtual diversity unit 30 when the S / N (signal-to-noise ratio) becomes a predetermined value or less due to degradation of the first received signal. Good.
When the first received signal is input, the synchronization processing unit 241 obtains a correlation between the effective symbol period and the guard interval period using a one-symbol delay memory, corrects the carrier frequency error, and performs sampling between the transceivers. Correction of frequency error is performed.
The detection processing unit 242 performs 2048, 4096, and 8192 point FFT (Fast Fourier Transform) arithmetic processing and detection processing corresponding to three types of transmission modes on the output signal of the synchronization processing unit 241.
The error correction processing unit 243 decodes transmission and multiplexing configuration control (TMCC), which is a control signal indicating a transmission parameter, with respect to the output signal of the detection processing unit 242, and de-maps the detection result based on the decoded result. The error stream is corrected by various de-interleavers, Viterbi decoding and Reed-Solomon decoding, and the transport stream is reproduced and output. Here, transport stream reproduction refers to transport stream packets that are received in each layer in layered transmission, error-corrected in units of transport stream packets, and re-multiplexed on the transmission side. The process of rearranging in order.

The demultiplexer 25a demultiplexes the transport stream and outputs a video signal (ES: Elementary stream) to which a time stamp (time information) is given and an audio signal (ES). Hereinafter, the video signal and the audio signal output from the demultiplexer 25a may be described as the own video / audio signal.
The video / audio signal buffer 26a (first buffer) buffers the video / audio signal of its own output from the demultiplexer 25a. The video / audio signal buffer 26a is a FIFO (First In First Out) buffer.

The virtual diversity unit 30 includes a broadcast signal buffer 301, a data distribution unit 302, and a data request unit 303. The virtual diversity unit 30 virtually realizes diversity with other receiving apparatuses 2.
The broadcast signal buffer 301 temporarily buffers the first reception signal output from the A / D conversion unit 23. The broadcast signal buffer 301 is a FIFO buffer. The broadcast signal buffer 301 stores the first received signal input most recently while discarding the first received signal after a predetermined time has elapsed.
The data distribution unit 302 distributes the first reception signal buffered in the broadcast signal buffer 301 in response to a request via the server 6.
The data request unit 303 requests a reception signal related to the broadcast station 5 from the other receiving device 2 via the server 6 and receives a second received signal from the other receiving device 2 via the server 6. is there.
The communication unit 32 is, for example, a network interface, and is hardware that transmits and receives packets via the network 9.

The demodulation processing unit 24b has the same configuration as the demodulation processing unit 24a. The demodulation processing unit 24b demodulates the second reception signal received by the data requesting unit 303. The demodulation processing unit 24b performs OFDM demodulation processing on the second received signal that is a digital signal, and outputs a transport stream. Note that a descrambler (not shown) for descrambling the transport stream is connected between the demodulation processing unit 24b and the demultiplexer 25b.
The demultiplexer 25b has the same configuration as the demultiplexer 25a, demultiplexes the transport stream obtained by demodulating the second received signal, and outputs a complementary video signal and audio signal to which a time stamp is given. Output. Hereinafter, the video signal (ES) and audio signal (ES) output from the demultiplexer 25b may be described as complementary video / audio signals.

The video / audio signal buffer 26b (second buffer) has the same configuration as the video / audio signal buffer 26a, and buffers the complementary video / audio signal output from the demultiplexer 25b.
The selector 27 switches one of the output signals from the video / audio signal buffers 26 a and 26 b and outputs the signal to the MPEG decoder 28.
The complement processing unit 31 controls the selector 27 by monitoring the output signals of the video and audio signal buffers 26a and 26b. If the video / audio signal stored in the video / audio signal buffer 26a has deteriorated, the complement processing unit 31 complements it with the video / audio signal for complement stored in the video / audio signal buffer 26b.
The MPEG decoder 28 converts the input video signal and audio signal into a video signal and audio signal compliant with HDMI (High-Definition Multimedia Interface).
The display buffer 29 buffers the output signal of the MPEG decoder 28 for a predetermined time. The display buffer 29 is a FIFO buffer. The receiving device 2 outputs a video signal and an audio signal compliant with HDMI to the display device 4 after a delay of a predetermined time buffered in the display buffer 29.
The display device 4 displays the HDMI video signal output from the receiving device 2 on a display unit (not shown) and outputs an audio signal to a speaker unit (not shown).

FIG. 3 is a flowchart of the virtual diversity processing in the first embodiment of the present invention.
The receiving device 2 starts the virtual diversity processing shown in FIG. 3 when the user turns on the power or the broadcasting station that the user receives is changed.
In step S <b> 10, the data distribution unit 302 of the receiving device 2 transmits an address message including its own IP address “202.213.124.7” to the server 6 through the communication unit 32.
In step S <b> 11, the data distribution unit 302 of the receiving device 2 transmits a received broadcast station message including identification information of the current channel (broadcast signal) to the server 6 through the communication unit 32.

In step S12, the virtual diversity unit 30 of the receiving device 2 determines the success or failure of error correction of the broadcast signal of the selected channel (broadcast station 5) based on the output signal of the demodulation processing unit 24a. Determine whether or not. The demodulation processing unit 24a performs the process of step S13 if the determination condition is not satisfied (No), and performs the process of step S18 if the determination condition is satisfied (Yes).
In step S13, the data distribution unit 302 of the reception device 2 deletes the reception signal buffered by the broadcast signal buffer 301. This erasure of the received signal may be realized by managing the position of the write (write) pointer of the broadcast signal buffer 30. As a result, the deteriorated received signal is not transmitted to another receiving device 2.
In step S <b> 14, the data request unit 303 of the receiving device 2 transmits a broadcast signal request message to the server 6 through the communication unit 32. This broadcast signal request message is a message for requesting a second reception signal received by another receiving device 2.

In step S <b> 15, the virtual diversity unit 30 of the receiving device 2 determines the message received from the server 6 by the communication unit 32. The virtual diversity unit 30 of the receiving device 2 performs the process of step S16 if the broadcast signal request message is received, performs the process of step S17 if the broadcast signal distribution message is received, and otherwise (timeout or reception error). Step S20 is performed.
In step S16, the data distribution unit 302 of the reception device 2 transmits a non-delivery response message to the server 6 through the communication unit 32, and returns to the process of step S15. This undeliverable response message is a message indicating that the requested second received signal cannot be distributed.
In step S17, the receiving apparatus 2 performs the process of step S20 after performing the complementing process (see FIG. 4) of the broadcast signal using the second received signal included in the received broadcast signal distribution message. .

In step S <b> 18, the virtual diversity unit 30 of the receiving device 2 determines the message received by the communication unit 32. The virtual diversity unit 30 performs the process of step S19 if the broadcast signal request message is received, and performs the process of step S20 in other cases.
In step S <b> 19, the data distribution unit 302 transmits a broadcast signal distribution message to the server 6 through the communication unit 32. This broadcast signal distribution message includes the first received signal buffered in the broadcast signal buffer 301.

In step S20, the virtual diversity unit 30 of the receiving device 2 determines whether or not to continue receiving broadcast signals. Here, the case where the reception of the broadcast signal is not continued refers to a case where operation information such as a power-off instruction or a channel change instruction is input by the user. If the determination condition is not satisfied (No), the receiving device 2 performs the process of step S21. If the determination condition is satisfied (Yes), the receiving apparatus 2 returns to the process of step S12.
In step S <b> 21, the data distribution unit 302 transmits a reception end message to the server 6 through the communication unit 32. This reception end message is a message to end the reception of the broadcast signal. When the process of step S21 ends, the receiving device 2 ends the process shown in FIG.

FIG. 4 is a flowchart of the broadcast signal complementing process according to the first embodiment of the present invention.
The virtual diversity unit 30 of the receiving device 2 starts the complementing process shown in FIG. 4 when the broadcast signal complementing process in step S17 shown in FIG. 3 is called.
In step S30, the virtual diversity unit 30 of the receiving device 2 activates each processing unit for complementation. The complementary processing units refer to the demodulation processing unit 24b, the demultiplexer 25b, the video / audio signal buffer 26b, and the complementary processing unit 31.
In step S31, the virtual diversity unit 30 of the receiving device 2 outputs the second received signal included in the broadcast signal distribution message to the demodulation processing unit 24b.

In step S32, the complementary processing unit 31 of the receiving device 2 acquires the time stamp of its own video / audio signal at the end of the video / audio signal buffer 26a.
In step S33, the complement processing unit 31 of the receiving device 2 determines whether or not a discontinuous portion is detected in the time stamp acquired from the video / audio signal buffer 26a. Here, the discontinuous portion refers to, for example, a case where a time stamp between frames that should be a predetermined cycle is separated from a predetermined cycle, and a case where its own video signal or audio signal is interrupted. If the determination condition is not satisfied (No), the complement processing unit 31 returns to the process of step S32. If the determination condition is satisfied (Yes), the complement processing unit 31 performs the process of step S34.

In step S <b> 34, the complement processing unit 31 of the receiving device 2 stops the input to the selector 27. As a result, the output signal from the selector 27 to the MPEG decoder 28 is stopped.
In step S35, the complementary processing unit 31 of the receiving device 2 acquires the time stamp of the complementary video / audio signal at the end of the video / audio signal buffer 26b.
In step S36, the complementing processing unit 31 of the receiving device 2 determines whether or not the time stamp of the complementary video / audio signal is the start time of the discontinuous portion. If the determination condition is not satisfied (No), the complement processing unit 31 performs the process of step S37. If the determination condition is satisfied (Yes), the complement processing unit 31 performs the process of step S38.

In step S37, the complementary processing unit 31 of the receiving apparatus 2 discards the complementary video / audio signal in the video / audio signal buffer 26b related to the time stamp, and the process returns to step S35. Thereby, the complement processing unit 31 can connect the video / audio signal for complementation to the start point of the discontinuous portion.
In step S38, the complement processing unit 31 of the receiving device 2 switches the input of the selector 27 to the output side of the video / audio signal buffer 26b.
In step S39, the complementary processing unit 31 of the receiving device 2 acquires the time stamp of the complementary video / audio signal at the end of the video / audio signal buffer 26b.

In step S40, the complementary processing unit 31 of the reception device 2 determines whether the time stamp of the complementary video / audio signal is the end time of the discontinuous portion, or whether the complementary video / audio signal is the end ( Judgment is made or not. If the determination condition is not satisfied (No), the complement processing unit 31 returns to the process of step S39. If the determination condition is satisfied (Yes), the complement processing unit 31 performs the process of step S41.
In step S41, the complement processing unit 31 of the receiving device 2 switches the input of the selector 27 to the output side of the video / audio signal buffer 26a. Thereby, the complement processing unit 31 can connect the video / audio signals for complementation to the end point of the discontinuous portion and can switch to the video / audio signals of its own.
In step S42, the receiving device 2 stops the above-described processing units for complementing, and ends the complementing processing of the broadcast signal shown in FIG.

FIG. 5 is a flowchart of server processing in the first embodiment of the present invention.
The server 6 repeats the process shown in FIG. 5 after starting itself.
In step S50, the broadcast station list management unit 62 of the server 6 determines the received message. The broadcast station list management unit 62 performs the process of step S51 if the broadcast signal request message is received, performs the process of step S56 if the address message is received, and performs the process of step S57 if the received broadcast station message is received. If processing is performed and a reception end message is received, processing in step S58 is performed.

In step S51, the broadcast station list management unit 62 of the server 6 searches the broadcast station list 631, and determines whether there is another receiving apparatus 2 that is receiving the station (channel). Here, the station is information included in the broadcast signal request message. The broadcast station list management unit 62 performs the process of step S55 if the determination condition is not satisfied (No), and performs the process of step S52 if the determination condition is satisfied (Yes).
In step S52, the broadcast station list management unit 62 of the server 6 transmits a broadcast signal request message to another receiving device 2 that is receiving the station (channel).
In step S <b> 53, the broadcast station list management unit 62 of the server 6 determines what message has been received from the other receiving device 2 that is receiving the broadcast signal from the broadcast station 5. The broadcast station list management unit 62 performs the process of step S54 if the broadcast signal distribution message is received, and performs the process of step S55 if the distribution impossible response message is received or otherwise. Here, the broadcast signal distribution message is a message for distributing the second reception signal to the receiving device 2 that has transmitted the broadcast signal request message. The undeliverable response message is a message indicating that it is impossible to distribute the received signal to the requesting receiving device 2.
In step S54, the broadcast station list management unit 62 of the server 6 transfers the received broadcast signal distribution message to the receiving device 2 that has made the request, and ends the process of FIG.
In step S55, the broadcast station list management unit 62 of the server 6 transmits a non-delivery response message to the requesting receiving device 2, and ends the process of FIG.

In step S56, the broadcasting station list management unit 62 of the server 6 creates an entry for the one receiving device 2 in the broadcasting station list 631, and stores the IP address of the receiving device 2 in the address column 631b of the receiving device. Then, the process of FIG.
In step S57, the broadcast station list management unit 62 of the server 6 updates the broadcast station list 631, and ends the process of FIG. The broadcast station list management unit 62 searches the address column 631b of the reception device based on the IP address of the reception device 2 that has transmitted the received broadcast station message, and the reception device 2 selects the broadcast station column 631a of the corresponding entry. Stores channel identification information.
In step S58, the broadcast station list management unit 62 of the server 6 deletes the corresponding entry from the broadcast station list 631. The broadcast station list management unit 62 searches the address column 631b of the receiving device by the IP address of the receiving device 2 that has transmitted the reception end message, deletes the corresponding entry, and ends the processing of FIG.

FIG. 6 is a sequence diagram of the virtual diversity processing in the first embodiment of the present invention.
If server 6 and receiving device 2-1 are activated, sequences Q10 to Q13 are started.
In sequence Q <b> 10, the receiving device 2-1 transmits an address message including its own IP address “202.213.124.7” to the server 6.
In sequence Q <b> 11, the reception device 2-1 transmits a reception broadcast station message including identification information of the current channel to the server 6. The server 6 stores the broadcast station and the address information of the receiving device 2-1 in the broadcast station list 631.
In sequence Q12, the reception device 2-1 transmits a broadcast signal request message to the server 6 because it has failed to receive the current channel. Based on the broadcast station list 631, the server 6 determines that there is no other receiving device 2 receiving the channel.
In sequence Q13, the server 6 transmits a non-delivery response message to the receiving device 2-1. Thereby, the receiving device 2-1 can detect that the virtual diversity processing has failed.

If the receiving device 2-2 is activated, sequences Q14 to Q20 are performed.
In sequence Q14, the receiving device 2-2 transmits an address message including its own IP address “202.213.128.5” to the server 6. The server 6 creates an entry related to the receiving device 2-2 in the broadcast station list 631.
In sequence Q15, the receiving device 2-2 transmits to the server 6 a received broadcast station message including identification information of the current channel. The server 6 stores the current channel identification information in the entry of the broadcast station list 631 created in sequence Q13 (see step S57 in FIG. 5).
In sequence Q16, the receiving device 2-1 transmits a broadcast signal request message to the server 6 because it has failed to receive the current channel. The server 6 detects the receiving device 2-2 receiving the channel based on the broadcast station list 631 (see step S51 in FIG. 5).

In sequence Q17, the server 6 transmits a broadcast signal request message to the receiving device 2-2.
In sequence Q18, the receiving device 2-2 has successfully received the current channel, and therefore transmits a broadcast signal distribution message including the second received signal to the server 6.
In sequence Q19, the server 6 transmits (transfers) a broadcast signal distribution message including the second received signal to the receiving device 2-1.
In the sequence Q20, the receiving device 2-1 performs a broadcast signal complementing process (see FIG. 4) using the second received signal included in the broadcast signal distribution message. Thereby, even if the broadcast signal received by its own antenna 21 deteriorates, the reception device 2-1 distributes the second reception signal from the reception device 2-2 via the server 6, so that the deteriorated broadcast is received. Complement the signal and watch the program normally.

The receiving device 2-1 performs the process of sequence Q <b> 21 when a power-off instruction is given by the user or when a channel change is instructed.
In sequence Q <b> 21, the reception device 2-1 transmits a reception end message to the server 6 through the network 9. Thereby, the broadcast station list 631 of the server 6 can be updated.

(Effects of the first embodiment)
The first embodiment described above has the following effects (A) to (F).

(A) The reception device 2 includes a data request unit 303 that requests a reception signal from another device connected to the network 9 when detecting that the broadcast signal of the current channel has deteriorated. Thereby, since the data request | requirement part 303 can complement the 1st received signal which concerns on the present channel, even if it is an area which can receive only the deteriorated broadcast signal, a program can be normally viewed.

(B) The receiving apparatus 2 includes a video / audio signal buffer 26a (first buffer) for buffering its own video signal and audio signal, and a video / audio signal buffer 26b (for buffering a complementary video signal and audio signal). A second buffer), and a selector 27 for switching and outputting them. As a result, even when the video signal and the audio signal are discontinuous, the video signal and the audio signal for complementation can be switched to and complemented in real time.

(C) The receiving device 2 includes a display buffer 29 for buffering the output signal of the MPEG decoder 28. Thus, the second received signal including the discontinuous period can be accommodated without having to accurately specify the period in which the video signal and the audio signal are discontinuous due to the deterioration of the broadcast signal. By demodulating the second received signal and decoding the complementary video signal and audio signal, the discontinuous period can be complemented.

(D) The receiving device 2 is buffered in the broadcast signal buffer 301 that buffers the broadcast signal received by the tuner 22 and in the broadcast signal buffer 301 in response to a request from another device connected to the network 9. A data distribution unit 302 that distributes the first reception signal. As a result, the receiving device 2 can accommodate not only the broadcast signal from another device but also the other device. Therefore, even if the other receiving apparatus 2 is arranged in an area where only a deteriorated broadcast signal can be received, the program can be normally viewed.

(E) The data distribution unit 302 of the receiving device 2 deletes the broadcast signal buffered in the broadcast signal buffer 301 when the demodulation processing unit 24a detects the deterioration of the first received signal. As a result, the deteriorated first received signal is not distributed, so that the other receiving devices 2 can normally view the program.

(F) The broadcast station list management unit 62 of the server 6 manages the channel selected by each receiving device 2. As a result, even if the broadcast signal of the selected channel among a plurality of channels deteriorates, it is possible to identify another receiving device 2 that has received the channel and allow the broadcast signal related to the channel to be accommodated. For example, even if receivers receiving different programs of the same transponder by satellite digital broadcasting, virtual diversity can be realized by interchanging digital data before being demodulated into a transport stream. it can.

(Second Embodiment)
The system according to the second embodiment has the same configuration as that of the system 1 according to the first embodiment, and hereinafter, the same reference numerals are assigned to the respective elements.
FIG. 7 is a flowchart of virtual diversity processing in the second embodiment of the present invention.
The process of steps S10 to S18 of the second embodiment is the same as the process of steps S10 to S18 of the first embodiment shown in FIG.
In step S18, when receiving the broadcast signal request message, the virtual diversity unit 30 performs the process of step S18a. This broadcast signal request message is a message for requesting a broadcast signal (first received signal) stored in the broadcast signal buffer 301.
In step S18a, the data distribution unit 302 transmits to the server 6 a distributable response message indicating that the broadcast signal (first received signal) stored in the broadcast signal buffer 301 can be transmitted. Then, the process of step S18b is performed.
In step S18b, the virtual diversity unit 30 determines a received message. If the virtual diversity unit 30 receives the address message from the server 6, the virtual diversity unit 30 performs the process of step S18c, and otherwise performs the process of step S20.

In step S18c, the virtual diversity unit 30 converts the broadcast signal distribution message including the broadcast signal (first received signal) stored in the broadcast signal buffer 301 into another receiving device having an IP address included in the address message. 2 and the process of step S20 is performed.
The processes in steps S20 and S21 are the same as the processes in steps S20 and S21 of the first embodiment shown in FIG.

FIG. 8 is a flowchart of server processing according to the second embodiment of the present invention.
The processing of steps S50 to S52 of the second embodiment is the same as the processing of steps S50 to S52 of the first embodiment shown in FIG. After the process of step S52 is completed, the server 6 performs the process of step S53A.
In step S53A, the server 6 determines what kind of message has been received from the other receiving device 2 that is receiving. The server 6 performs the process of step S54A if it receives a distributable response message from the other receiving device 2, and if it receives the undeliverable response message from the other receiving device 2, and if not, it performs the step. The process of S55 is performed.
In step S54A, the server 6 transmits the address of the requesting receiving apparatus 2 to the other receiving apparatus 2 that is currently receiving, and ends the processing in FIG.
Thereafter, the processes of steps S55 to S58 are the same as the processes of steps S55 to S58 of the first embodiment shown in FIG.

FIG. 9 is a sequence diagram of virtual diversity processing in the second embodiment of the present invention.
The processing of sequences Q10 to Q17 of the second embodiment is the same as the processing of sequences Q10 to Q17 of the first embodiment shown in FIG. After the processing of sequence Q17 is completed, receiving device 2-2 performs processing of sequence Q17a.
In sequence Q17a, the receiving device 2-2 transmits a distributable response message to the server 6.
In sequence Q17b, the server 6 transmits an address message including the IP address of the receiving device 2-1 to the receiving device 2-2.
In sequence Q17c, the receiving device 2-2 transmits a broadcast signal distribution message including the broadcast signal (second received signal) in the broadcast signal buffer 301 using the IP address of the receiving device 2-1.
The processing of sequences Q20 and Q21 is the same as the processing of sequences Q20 and Q21 of the first embodiment shown in FIG.

(Effect of 2nd Embodiment)
The second embodiment described above has the following effect (G).

(G) In the reception device 2, the data distribution unit 302 distributes the first reception signal buffered in the broadcast signal buffer 301 to other reception devices 2 in response to a request from the server 6. For this reason, the receiving device 2 can directly distribute the first received signal to the other receiving device 2 without going through the server 6. Thereby, since the other receiving device 2 can shorten the time from when the broadcast signal is requested to the server 6 until the first received signal is received, the audio / video signal buffers 26a and 26b, The capacity of the signal buffer 301 can be reduced. Furthermore, it is possible to reduce a delay until an image or sound is displayed after the broadcast wave is received by the antenna 21.

(Third embodiment)
FIG. 10 is a diagram showing a schematic configuration of a system 1B in the third embodiment of the present invention. The same symbols are assigned to the same elements as those of the system 1 (see FIG. 1) of the first embodiment.
The system 1B includes a broadcasting station 5, a plurality of receiving devices 2B-1 to 2B-3, and an address mediation server 7. The receiving devices 2B-1 to 2B-3 and the address mediation server 7 are connected by a network 9.
Each of the receiving apparatuses 2B-1 to 2B-3 includes an antenna 21 and receives a broadcast signal from the broadcast station 5 via the antenna 21. The IP address of the receiving device 2B-1 is “202.213.124.7”, the IP address of the receiving device 2B-2 is “202.213.128.5”, and the IP address of the receiving device 2B-3 is “202.213.132.3”. Is. Hereinafter, when the receiving devices 2B-1 to 2B-3 are not particularly distinguished, they are described as the receiving device 2B.

The address mediation server 7 transmits and receives packets to and from the receiving device 2B via the network 9, and mediates the IP address. The address mediation server 7 includes a communication unit 71, a parent device list management unit 72, and a storage unit 73.
The communication unit 71 is a network interface, for example, and transmits and receives data via the network 9.
The storage unit 73 is an HDD, for example, and stores data. The storage unit 73 stores a parent device list 731. The parent device list 731 is a table for registering the IP address of the receiving device 2B that is the parent device. Note that the parent device is the receiving device 2B that functions in the same manner as the server 6 of the first embodiment, and the child device is a receiving device 2B other than the receiving device 2B that is the parent device.
The parent device list management unit 72 transmits and receives packets to and from the receiving device 2B via the network 9, and manages the parent device list 731. The parent device list management unit 72 is realized by a CPU (not shown) included in the address mediation server 7 executing a program.

FIG. 11 is a diagram illustrating a configuration of a receiving device 2B according to the third embodiment of the present invention. The same reference numerals are assigned to the same elements as those of the receiving apparatus 2 (see FIG. 2) of the first embodiment.
The receiving device 2B is connected to the network 9 and the display device 4.
In addition to the same configuration as the receiving device 2 of the first embodiment, the receiving device 2B further includes a parent device determination unit 33, a broadcast station list management unit 34, and a storage unit 35.
The parent device determination unit 33 performs processing for determining a parent device.
The storage unit 35 is, for example, an HDD, and stores data. The storage unit 35 stores a broadcast station list 351. The broadcast station list 351 has the same configuration as the broadcast station list 631 shown in FIG.
The broadcast station list management unit 34 manages the broadcast station list 351 based on packet transmission / reception with the reception device 2B via the network 9, and the first implementation is performed when the reception device 2B is a parent device. It functions in the same manner as the broadcast station list management unit 62 of the embodiment.
The parent device determination unit 33 and the broadcast station list management unit 34 are realized by a CPU (not shown) included in the reception device 2B executing a program.

FIG. 12 is a flowchart of the parent device determination process of each receiving device 2B in the third embodiment of the present invention.
When the user turns on the power or the broadcasting station that the user receives is changed, the receiving device 2B starts the parent device determination process shown in FIG.
In step S70, the parent device determination unit 33 of the receiving device 2B transmits an address inquiry message for inquiring about the IP address of the receiving device 2B, which is the parent device, to the address mediating server 7.
In step S <b> 71, the parent device determination unit 33 of the receiving device 2 </ b> B determines whether or not the IP address of the receiving device 2 </ b> B that is the parent device can be effectively acquired from the address mediation server 7. Specifically, the parent device determination unit 33 determines whether or not the acquired IP address is an invalid value (for example, “0.0.0.0”), and further communicates with the IP address using Ping or the like. Determine whether it is valid. If the determination condition is not satisfied (No), the parent device list management unit 72 performs the process of step S72. If the determination condition is satisfied (Yes), the parent apparatus list management unit 72 performs the process of step S79.
In step S72, the parent device determination unit 33 of the receiving device 2B transmits to the address mediating server 7 an address invalidation message indicating that the IP address of the receiving device 2B that is the parent device is invalid. The parent device list management unit 72 of the address mediating server 7 invalidates the IP address of the parent device recorded in the parent device list 731.
In step S73, the parent device determination unit 33 of the receiving device 2B transmits an address registration message for registering the IP address of the own device as the parent device to the address mediation server 7. The parent device list management unit 72 registers the IP address in the parent device list 731 in the storage unit 73.

In step S74, the receiving device 2B operates as a parent device. Here, the operation as the parent device is the same as the processing of the server 6 of the first embodiment shown in FIG. 5, for example.
In step S75, the receiving device 2B determines whether or not the user has detected a power-off instruction for the own device. If the determination condition is not satisfied (No), the receiving device 2B returns to the process of step S74. If the determination condition is satisfied (Yes), the reception apparatus 2B performs the process of step S76.
In step S76, the parent device determination unit 33 of the reception device 2B transmits to the address mediation server 7 an address invalidation message indicating that the IP address of the own device is invalid. The parent device list management unit 72 of the address mediation server 7 invalidates the IP address recorded in the parent device list 731 by setting an invalid value such as “0.0.0.0”, for example.
In step S77, the parent device determination unit 33 of the receiving device 2B refers to the broadcast station list 351, and if there are one or more child devices, any of the receiving devices 2B that are child devices exists. A request message for requesting to become the next parent device is transmitted to one device.
In step S78, when there are one or more child devices, the parent device determination unit 33 of the receiving device 2B sends the next parent device to the receiving device 2B, which is all other child devices other than the next parent device. An address message including the IP address of the receiving device 2B, which is the device, is transmitted, and the process of step S83 is performed.

In step S79, the parent device determination unit 33 of the reception device 2B determines the message received from the reception device 2B that is the parent device. When the parent device determination unit 33 receives the next parent device address message requesting to become the next parent device, the parent device determination unit 33 performs the process of step S73 and sends an address message including the IP address of the next parent device. If received, the process of step S80 is performed.
In step S80, the parent device determination unit 33 of the receiving device 2B determines whether the current parent device address included in the next parent device address message is valid. Specifically, the parent device determination unit 33 determines whether or not the acquired IP address is an invalid value, and further determines whether or not it is valid by communicating with the IP address using Ping or the like. If the determination condition is not satisfied (No), the parent device determination unit 33 returns to the process of step S70 via the node A. If the determination condition is satisfied (Yes), the parent apparatus determination unit 33 performs the process of step S81.
In step S81, the receiving device 2B operates as a child device. Here, the operation as a child device is the same as, for example, the virtual diversity processing of the receiving device 2 of the first embodiment shown in FIG.
In step S82, the receiving apparatus 2B determines whether or not the user has detected a power-off instruction for the own apparatus. If the determination condition is not satisfied (No), the reception device 2B returns to the process of step S79, and if the determination condition is satisfied (Yes), the reception apparatus 2B performs the process of step S83.
In step S83, the receiving device 2B executes power-off of its own device and ends the processing in FIG.

FIG. 13 is a flowchart of server parent device determination processing according to the third embodiment of the present invention.
When the address mediation server 7 is activated, it performs server parent device determination processing.
In step S <b> 90, the parent device list management unit 72 determines the message received by the communication unit 71. If the parent device list management unit 72 receives an address inquiry message for inquiring about the IP address of the parent device, the parent device list management unit 72 performs the process of step S91. If an address registration message for registering the IP address of its own device as the parent device is received from the receiving device 2B, the process of step S97 is performed.
In step S91, the parent device list management unit 72 determines whether or not the parent device IP address is registered in the parent device list 731. If the determination condition is not satisfied (No), the parent device list management unit 72 performs the process of step S95. If the determination condition is satisfied (Yes), the parent apparatus list management unit 72 performs the process of step S92.
In step S92, the parent device list management unit 72 uses the communication unit 71 to confirm whether or not the receiving device 2B that is the parent device registered in the parent device list 731 is valid as a parent device. Send confirmation message.

In step S93, the parent device list management unit 72 determines a message received from the receiving device 2B by the communication unit 71. If the parent device list management unit 72 receives from the receiving device 2B, which is the parent device, an address valid response message indicating that the parent device is valid, the parent device list management unit 72 performs the process of step S94. Perform the process.
In step S94, the parent device list management unit 72 uses the communication unit 71 to transmit the IP address of the receiving device 2B, which is the parent device, to the receiving device 2B that has inquired the IP address of the parent device. The process returns to S90.
In step S95, the parent device list management unit 72 transmits an invalid value message indicating that there is no parent device to the inquiry source receiving device 2B through the communication unit 71, and returns to the process of step S90.
In step S96, the parent device list management unit 72 invalidates the IP address of the parent device registered in the parent device list 731 and returns to the process of step S90.
In step S97, the parent device list management unit 72 registers the IP address included in the address registration message as the valid parent device IP address in the parent device list 731 and returns to the process of step S90.

FIG. 14 is a sequence diagram of parent device determination processing in the third embodiment of the present invention.
Receiving device 2B-2 and address mediation server 7 start sequences Q30 to Q33. At this time, the receiving device 2B-1 and the receiving device 2B-3 are not activated.
In sequence Q30, the receiving device 2B-2 transmits to the address mediating server 7 a parent device address inquiry message that inquires about the IP address of the receiving device 2B that is the parent device.
In sequence Q31, the address mediation server 7 transmits an invalid value message to the effect that there is no valid receiving device 2B as a parent device to the receiving device 2B-2.
In sequence Q32, the reception device 2B-2 transmits an address invalidation message to the address mediation server 7. This address invalidation message is a message requesting invalidation of the IP address of the parent device.
In sequence Q33, the receiving device 2B-2 transmits to the address mediating server 7 an address registration message requesting that the IP address of its own device be registered as the parent device. The address mediation server 7 registers the IP address of the receiving device 2B in the parent device list 731.

When receiving apparatus 2B-3 is activated, sequences Q34 to Q37 are started.
In sequence Q34, the reception device 2B-3 transmits to the address mediation server 7 a parent device address inquiry message that inquires about the IP address of the reception device 2B that is the parent device.
In sequence Q35, the address mediation server 7 transmits to the receiving device 2B-2 a parent device address confirmation message for confirming whether or not the parent device is valid.
In sequence Q36, the receiving device 2B-2 transmits to the address mediating server 7 an address valid response message indicating that it is valid as a parent device.
In sequence Q37, the address mediation server 7 transmits a parent device address message including the IP address of the reception device 2B-2 that is the parent device to the reception device 2B-3.
When receiving apparatus 2B-1 is activated, sequences Q38 to Q41 are started.
In sequence Q38, the receiving device 2B-1 transmits to the address mediating server 7 a parent device address inquiry message that inquires about the IP address of the receiving device 2B that is the parent device.
In sequence Q39, the address mediation server 7 transmits to the receiving device 2B-2 a parent device address confirmation message for confirming whether or not the parent device is valid.
In sequence Q40, the receiving device 2B-2 transmits to the address mediating server 7 an address valid response message indicating that it is valid as the parent device.

In sequence Q41, the address mediation server 7 transmits the IP address of the receiving device 2B-2 that is the parent device to the receiving device 2B-1.
When the user turns off the power switch of receiving apparatus 2B-2, sequences Q50 to Q58 are started.
In sequence Q50, receiving apparatus 2B-2 detects a power-off instruction from the user.
In sequence Q51, the receiving device 2B-2 transmits to the address mediating server 7 a self device address invalidation message indicating that the self device IP address is invalid as a parent device.
In sequence Q52, the receiving apparatus 2B-2 transmits a request message for requesting the receiving apparatus 2B-1 to become the next parent apparatus.
In sequence Q53, the receiving device 2B-1 transmits to the address mediating server 7 a parent device address inquiry message that inquires about the IP address of the receiving device 2B that is the parent device.

In sequence Q54, the address mediation server 7 transmits an invalid value message indicating that there is no valid receiving device 2B as a parent device to the receiving device 2B-1.
In sequence Q55, the reception device 2B-1 transmits an address invalidation message requesting the address mediation server 7 to invalidate the IP address of the parent device recorded in the parent device list 731.
In sequence Q56, the receiving device 2B-1 transmits to the address mediating server 7 an address registration message requesting that the IP address of its own device be registered as the parent device.
In sequence Q57, the receiving device 2B-2 transmits the IP address of the receiving device 2B-1 that is the next parent device to the receiving device 2B-3.
In sequence Q58, the receiving apparatus 2B-2 executes power-off.

(Effect of the third embodiment)
The third embodiment described above has the following effect (H).

(H) The reception device 2B further includes a parent device determination unit 33 that determines which of the reception devices 2B connected to the network 9 is the parent device that functions as the server 6 of the first embodiment. When the parent device determination unit 33 is instructed to turn off its own power, the parent device determination unit 33 transmits a message requesting to be the next parent device to any of the other receiving devices 2B. The address mediation server 7 can store the parent device list 731 having a smaller capacity than the broadcast station list 631. As a result, the server installation cost can be reduced.

(Modification)
The present invention is not limited to the above-described embodiment, and can be modified without departing from the spirit of the present invention. For example, there are the following (a) to (m).

(A) The receiving device 2 of the first embodiment is a single set-top box. However, the present invention is not limited to this, and the receiving device 2 may be configured as a tuner unit incorporated in a television or a recording device.

(B) The receiving device 2 of the first embodiment determines whether or not the broadcast signal has been successfully received based on the success or failure of error correction of the broadcast signal. However, the present invention is not limited to this, and the receiving device 2 may determine whether or not the broadcast signal has been successfully received by detecting the deterioration of the S / N ratio of the broadcast signal. As a result, the receiving device 2 can detect the deterioration of the broadcast signal earlier than the error correction process, and thus can more reliably complement the broadcast signal.

(C) When the data distribution unit 302 of the virtual diversity unit 30 of the first embodiment receives a broadcast signal request message from another receiver 2, the broadcast signal buffered in the broadcast signal buffer 301 (first The broadcast signal distribution message including the received signal is transmitted to the other receiving device 2. However, the present invention is not limited to this, and the data distribution unit 302 of the virtual diversity unit 30 receives the broadcast signal request message from the other receiving device 2 until receiving the message indicating the request end of the broadcast signal. A broadcast signal distribution message including a broadcast signal (first received signal) buffered in its own broadcast signal buffer 301 may be continuously transmitted to the other receiving device 2.

(D) If the data distribution unit 302 of the virtual diversity unit 30 receives a broadcast signal request message from another receiving device 2, the broadcast buffered in its own broadcast signal buffer 301 during a predetermined period. A broadcast signal distribution message including a signal (first received signal) may be continuously transmitted to the other receiving device 2.

(E) If the data distribution unit 302 of the virtual diversity unit 30 receives a broadcast signal request message from another receiving device 2, it is determined according to the frequency at which the other receiving device 2 fails to receive the broadcast signal. During the period, the broadcast signal distribution message including the broadcast signal (first received signal) buffered in its own broadcast signal buffer 301 may be continuously transmitted to the other receiving device 2.

(F) The server 6 in the second embodiment receives the broadcast signal request message from any of the receiving devices 2 and determines that there is another receiving device 2 receiving the station (channel). Then, after transmitting the broadcast signal request message to the other receiving device 2, the address of the receiving device 2 that is the request source is transmitted. However, the present invention is not limited to this, and when the server 6 receives a broadcast signal request message from any of the receiving devices 2 and determines that there is another receiving device 2 receiving the station (channel), the request is made. The address of the receiving device 2 that is the distribution source may be transmitted to the original receiving device 2. Alternatively, without determining whether there is another receiving device 2, a plurality of candidate distribution source addresses are transmitted to the request source, and distribution requests are made to each distribution source until the request source can acquire complementary data. May be. As a result, communication traffic between the receiving apparatuses 2 is reduced, and processing can be performed in a short time. Further, the server 6 has a white address list storing the addresses of the receiving apparatuses 2 that are correctly operated, and determines whether or not the address of the receiving apparatus 2 that is the request source may be transmitted to the other receiving apparatuses 2. The white list address may be used for checking. Further, by encrypting addresses transmitted / received between the server 6 and the receiving apparatus 2 and addresses transmitted / received between the receiving apparatuses 2, interference by a malicious third party may be prevented.

(G) In the third embodiment, Ping communication for confirming whether the address of the parent device is valid is performed by the address mediation server 7. However, the present invention is not limited to this, and each receiving device 2B that is a child device may perform Ping communication with the parent device to check whether the address of the parent device is valid.

(H) Further, in the third embodiment, the receiving device 2B as the parent device selects any one of the receiving devices 2B as the child devices, and the selected receiving device 2B has a predetermined time interval. If the polling from the parent device is monitored and the polling is no longer detected, it may be configured to become the next parent device. As a result, when the receiving device 2B that is the parent device ends abnormally (for example, abnormal disconnection of the power supply or abnormal network disconnection), the selected receiving device 2B can operate as the next parent device. It is possible to prevent the parent device from disappearing.

(I) In the second embodiment, after the server 6 is paired with a plurality of receiving devices 2 receiving the same channel, the plurality of receiving devices 2 are connected to each other without going through the server 6. Alternatively, the broadcast signal may be accommodated. As a result, the load on the server 6 is reduced, and more receivers 2 can be managed.

(J) The signal to be complemented is not limited to a video signal and an audio signal, and any signal may be used as long as it is a digital signal managed by a time stamp. For example, if the terrestrial digital television broadcast regulations are changed and time information is added to the transport stream, the transport stream output by the demodulation processing unit 24a and the demodulation processing unit 24b output the information. The complementary transport stream may be buffered, and the discontinuous portions of the own transport stream may be connected by the complementary transport stream.

(K) The broadcast signal distributed to the other receiving device 2 is not limited to the output signal of the A / D conversion unit 23, and any signal may be used as long as it is a digital signal before descrambling. For example, the output signal of the synchronization processing unit 241, the output signal of the detection processing unit 242, and the output signal of the error correction processing unit 243 may be buffered in a FIFO buffer and distributed to other receiving apparatuses 2.
(L) In the first embodiment, the position of the descrambler (not shown) is not limited to the position between the demodulation processing unit 24a and the demultiplexer 25a, or between the demodulation processing unit 24b and the demultiplexer 25b. It may exist anywhere before the decoder 28.

(M) In the first and second embodiments, it has become clear that the server 6 has not received a broadcast station in the process of step S53 (FIG. 5) or the process of step S53A (FIG. 7). In this case, the entry may be deleted from the broadcast station list 631.

1, 1B system 2, 2-1, 2-2, ..., 2B, 2B-1 to 2B-3 receiver 4 display device 5 broadcast station 6 server 7 address mediating server 9 network 21 antenna 22 tuner 23 A / D conversion Unit 24a demodulation processing unit (first demodulation processing unit)
24b Demodulation processor (second demodulation processor)
25a, 25b Demultiplexer 26a Video / audio signal buffer (first buffer)
26b Video / audio signal buffer (second buffer)
27 Selector 28 MPEG decoder 29 Display buffer 30 Virtual diversity unit 31 Complementary processing unit 32, 61, 71 Communication unit 33 Parent device determination unit 34, 62 Broadcast station list management unit 35, 63, 73 Storage unit 72 Parent device list management unit 241 Synchronization processing unit 242 Detection processing unit 243 Error correction processing unit 301 Broadcast signal buffer 302 Data distribution unit 303 Data request units 351 and 631 Broadcast station list 631a Broadcast station column 631b Receiver device address column 731 Parent device list

Claims (12)

  1. A tuner for converting a broadcast signal received from a predetermined broadcast station into a first received signal;
    A first demodulation processing unit that demodulates the first received signal;
    A first buffer for buffering the signal demodulated by the first demodulation processing unit;
    A communication unit that transmits and receives data via a network;
    If the first demodulation processing unit detects the deterioration of the first received signal, a data request unit that requests the other device connected to the network for the received signal related to the predetermined broadcast station;
    A demodulation processing unit that demodulates a signal in the same format as the first reception signal demodulated by the first demodulation processing unit by the same processing as the first demodulation processing unit , wherein the data request unit receives the signal A second demodulation processing unit for demodulating the received second received signal;
    A second buffer for buffering the signal demodulated by the second demodulation processing unit;
    If a discontinuous portion is detected in the time stamp of the signal obtained from the first buffer, the time stamp of the signal at the end of the second buffer is obtained, and the time stamp is set at the start time of the discontinuous portion. After canceling the signal of the second buffer until it becomes, the complement processing unit to switch to the second buffer and output,
    A receiving apparatus comprising:
  2.   The complement processing unit switches to the second buffer and outputs it. If the end time of the discontinuous portion or the signal of the second buffer ends, switch to the first buffer. Output,
      The receiving apparatus according to claim 1.
  3. A broadcast signal buffer for buffering broadcast signals received by the tuner;
    A data distribution unit that distributes the first reception signal buffered in the broadcast signal buffer in response to a request from the other device connected to the network;
    The receiving apparatus according to claim 1, further comprising:
  4.   A broadcast signal buffer for buffering broadcast signals received by the tuner;
      Data distribution that continuously distributes the first received signal buffered in the broadcast signal buffer from when a request is received from the other device connected to the network until the end of the request is received And
      The receiving apparatus according to claim 1, further comprising:
  5.   A broadcast signal buffer for buffering broadcast signals received by the tuner;
      A data distribution unit that continuously distributes the first reception signal buffered in the broadcast signal buffer during a predetermined period if a request from the other device connected to the network is received When,
      The receiving apparatus according to claim 1, further comprising:
  6.   A broadcast signal buffer for buffering broadcast signals received by the tuner;
      If a request from the other device connected to the network is received, the buffered buffer in the broadcast signal buffer for a period determined according to the frequency with which the other device fails to receive the broadcast signal. A data distribution unit for continuously distributing the first reception signal;
      The receiving apparatus according to claim 1, further comprising:
  7. The data distribution unit deletes the broadcast signal buffered in the broadcast signal buffer when the first demodulation processing unit detects deterioration of the first received signal.
    The receiving apparatus according to any one of claims 3 to 6, characterized in that.
  8. The other device is a server;
    The server relays communication between one receiving device connected to the network and the other receiving device;
    The receiving apparatus according to any one of claims 3 to 6, characterized in that.
  9. The data distribution unit distributes the first reception signal buffered in the broadcast signal buffer to another reception device in response to a request from the server.
    The receiving device according to claim 8 .
  10. A parent device determination unit that determines which of the receiving devices connected to the network is the parent device that functions as the server;
    Further comprising
    The parent device determination unit transmits a message requesting to become the next parent device to any other receiving device when the power-off of itself is instructed.
    The receiving device according to claim 8 or 9 , wherein
  11. The receiving apparatus according to any one of claims 1 to 10,
    A television characterized by comprising.
  12. The receiving apparatus according to any one of claims 1 to 10,
    A recording apparatus comprising:
JP2013001287A 2013-01-08 2013-01-08 Receiving device, television, and recording device Active JP6192155B2 (en)

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JP3998196B2 (en) * 2003-03-17 2007-10-24 日本放送協会 Wireless reception method, wireless receiver, and wireless reception program
JP4421981B2 (en) * 2004-09-09 2010-02-24 パイオニア株式会社 Content remote viewing system, content remote viewing server device, content remote viewing recording / playback device, content remote viewing method, and computer program
US8726318B2 (en) * 2006-10-04 2014-05-13 Mitsubishi Electric Corporation Multimedia information receiving apparatus
JP2009077038A (en) * 2007-09-19 2009-04-09 Denso Corp Mobile communication terminal having broadcast reception function, and broadcast data complement system
JP2011010186A (en) * 2009-06-29 2011-01-13 Nec Magnus Communications Ltd Digital broadcast retransmission system, digital broadcast retransmission method, packet converting apparatus, and frequency converting apparatus
JP2011146896A (en) * 2010-01-14 2011-07-28 Nec Corp Portable terminal, broadcast program viewing method of portable terminal and program, broadcast program viewing system
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