JP2008252390A - Broadcast receiver and receiving method, program, and its recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a broadcast receiver provided with a function to playback video and sound by a single decoder while maintaining a diversity effect of a plurality of channels and temporally synchronizing of simultaneous broadcasting of a plurality of channels having a delay difference. <P>SOLUTION: Broadcast data that delays from the other broadcast data between first broadcast data received by a first tuner 101 and a first demodulator 102 and second broadcast data received by a second tuner 109 and a second demodulator 110 is input from a switch 103 to a selection processing part 105, and the broad cast that does not delay is input from the switch 103 to the selection processing part 105 through a buffer 104 to thereby synchronize the both broadcast data. In addition, a packet including no errors is selected between mutually corresponding packets in the both broadcast data and output from the selection processing part 105 to a decoder 106. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a broadcast receiving apparatus that receives broadcast data.

  In the ISDB-T system defined by ARIB STD-B31 and the like, there are a plurality of segments in a physical channel on which broadcasting is performed, and broadcasts of different transmission systems can be transmitted in one physical channel. One-segment broadcasting uses this framework, and broadcasts to a portable receiver using one central segment among 13 segments within one terrestrial digital television physical channel band.

  Since the modulation system of 1Seg broadcasting is specialized for portable receivers that have only a poor antenna, high-quality video and audio that could not be realized with conventional analog broadcasting can be received even by portable receivers. Yes.

  By the way, there is diversity as a technique for improving reception sensitivity for a portable receiver. Diversity is a method in which a plurality of radio waves are received and received power is obtained by selecting or combining these received waves in a receiver.

For example, Patent Document 1 includes two systems including a tuner, a digital demodulator, and a decoder.
A technique is disclosed in which diversity reception is performed when reception conditions are not good, and control is performed so that two different digital broadcasts are received when reception conditions are good.
JP 2007-43609 A (published February 15, 2007)

  However, in the method of Patent Document 1, since it is necessary to provide two decoders in order to improve reception sensitivity, there is a problem in that the cost is increased, and the apparatus is increased in size and complexity.

  Further, when two tuners are provided, it is conceivable that the same channel is received by these two tuners, and the same content is received by different channels using these two tuners.

  However, Patent Document 1 does not consider a transmission delay difference between a channel that receives a normal broadcast and a channel that is retransmitted to an area where the normal broadcast does not reach. For this reason, if the same content is received on two channels having a transmission delay difference and control is performed to display the decoder output in which no error occurs, switching cannot be performed as a continuous video signal. For this reason, for example, when switching from a channel with a large delay amount to a channel with a small delay amount, there is no video in the middle. On the other hand, when switching from a channel with a small delay amount to a channel with a large delay amount, the same video is repeatedly displayed twice for the difference in delay amount.

  The present invention has been made in view of the above-described problems, and its purpose is to receive multiple channels of simultaneous broadcasting with a delay difference that can increase reception sensitivity by the diversity effect of multiple channels. Even so, an object of the present invention is to provide a broadcast receiving apparatus that can synchronize each channel and can simplify the apparatus configuration.

  In order to solve the above problems, the broadcast receiving apparatus of the present invention is a broadcast receiving apparatus comprising a plurality of receiving means for receiving broadcast data and a decoder for decoding the broadcast data, and the reception is different from each other. When a plurality of pieces of broadcast data received by each means are broadcast data of common contents, a delay correction unit that synchronizes each broadcast data, and a packet corresponding to each other in the plurality of broadcast data synchronized by the delay correction unit And a selection unit that selects any one of the corresponding packets and outputs the selected packet to the decoder.

  According to the above configuration, when a plurality of pieces of broadcast data received by different receiving units are broadcast data of common content, the delay correction unit synchronizes each piece of broadcast data. Then, the selection unit selects any one of the packets corresponding to each other according to the reception quality of the packets corresponding to each other in the plurality of broadcast data synchronized by the delay correction unit, and selects the selected packet. Output to the decoder.

  Therefore, since the selection unit selects which broadcast data packet is output to the decoder according to the reception quality, the reception sensitivity can be increased by the diversity effect. In addition, since the delay correction unit synchronizes each piece of broadcast data, even if the configuration is such that the broadcast data to be used in units of packets is switched, the content (for example, video, audio, etc.) is interrupted in the middle or the same content is duplicated. Can be prevented. In addition, since it is not necessary to provide a plurality of decoders, the device configuration can be simplified and reduced in size, and the manufacturing cost can be reduced.

  In addition, an error detection unit that determines whether or not each packet in the broadcast data includes an error, and the selection unit, when the plurality of broadcast data is broadcast data of common content, A configuration may be adopted in which packets that do not include an error are selected from packets corresponding to each other in the broadcast data and output to the decoder.

  According to the above configuration, since the selection unit selects a packet that does not include an error and outputs the packet to the decoder, the reception sensitivity can be increased.

  In addition, an error occurrence rate detection unit that detects an error occurrence rate of each packet in the broadcast data, and the selection unit, in the case where the plurality of broadcast data is broadcast data of common content, A configuration may be adopted in which the packet with the lowest error occurrence rate is selected from the mutually corresponding packets and output to the decoder.

  According to the above configuration, the selection unit selects the packet with the lowest error occurrence rate and outputs it to the decoder, so that the reception sensitivity can be increased.

  The plurality of receiving means may include two or more receiving means including a tuner that receives broadcast data and a demodulator that demodulates the broadcast data received by the tuner.

  According to said structure, receiving sensitivity can be raised by the diversity effect. Further, it is possible to prevent content from being interrupted in the middle or the same content from being output repeatedly.

  In addition, the plurality of receiving means receive receiving means including a tuner for receiving broadcast data, a demodulator for demodulating the broadcast data received by the tuner, and broadcast data transmitted via a communication network. And receiving means having an interface to be included.

  According to said structure, receiving sensitivity can be raised by the diversity effect. Further, it is possible to prevent content from being interrupted in the middle or the same content from being output repeatedly. Even if it is difficult to receive one of the two receiving means, the other receiving means can receive the broadcast data. Therefore, the area where broadcast data can be received can be expanded.

  The delay correction unit includes a buffer that delays and outputs input broadcast data, a switching unit that switches broadcast data input to the buffer, and a delay amount detection unit that detects a delay amount between the broadcast data. Based on the delay amount detected by the delay detection means, determining broadcast data to be input to the buffer, and controlling the operation of the switching section, and based on the delay amount detected by the delay detection means A correction amount control unit that controls the output timing of the broadcast data in the buffer may be provided.

  According to said structure, each broadcast data can be easily synchronized by controlling the output timing of the broadcast data in a buffer based on the delay amount which the delay detection means detected.

  The delay amount detection unit may be configured to detect a delay amount using time information included in broadcast data. For example, the time information may be PCR in the MPEG-2 standard.

  According to said structure, the amount of delay between each broadcast data can be easily detected using the time information contained in broadcast data.

  The delay amount detection unit may be configured to detect a delay amount between the broadcast data using delay amount information included in the broadcast data.

  According to said structure, the delay amount between each broadcast data can be easily detected using both the delay information contained in broadcast data.

  The broadcast receiving method of the present invention is a broadcast receiving method in a broadcast receiving apparatus comprising a plurality of receiving means for receiving broadcast data and a decoder for decoding the broadcast data, which are respectively received by the different receiving means. When a plurality of broadcast data are broadcast data of common contents, the delay correction step for synchronizing these broadcast data and the reception quality of the packets corresponding to each other in the plurality of broadcast data synchronized by the delay correction step A selection step of selecting any one of the corresponding packets and outputting the selected packet to the decoder.

  According to the above method, when a plurality of pieces of broadcast data received by different receiving units are broadcast data of common contents, the respective broadcast data are synchronized in the delay correction step. Then, in the selection step, according to the reception quality of the packets corresponding to each other in the plurality of broadcast data synchronized by the delay correction unit, one of the packets corresponding to each other is selected, and the selected packet is selected. Output to the decoder.

  Therefore, since the selection of which broadcast data packet is to be output to the decoder in accordance with the reception quality is selected in the selection step, the reception sensitivity can be enhanced by the diversity effect. Also, since each broadcast data is synchronized in the delay correction process, even if the configuration is such that the broadcast data used in units of packets is switched, the video may be interrupted in the middle or the same video may be displayed in duplicate. Can be prevented.

  The delay correction unit and the selection unit may be realized by a computer. In this case, a program for causing the broadcast receiving apparatus to be realized by the computer by causing the computer to operate as the respective units, and recording the program. Such computer-readable recording media are also included in the scope of the present invention.

  The broadcast receiving apparatus of the present invention is synchronized by a delay correction unit and a delay correction unit that synchronize each broadcast data when a plurality of pieces of broadcast data received by different receiving units are broadcast data of common content. A selection unit that selects any one of the packets corresponding to each other according to reception quality of the packets corresponding to each other in the plurality of broadcast data, and outputs the selected packet to the decoder. .

  Also, the broadcast receiving method of the present invention includes a delay correction step for synchronizing each broadcast data when the plurality of broadcast data respectively received by different receiving means are broadcast data of common content, and the delay correction A selection step of selecting any one of the corresponding packets and outputting the selected packet to the decoder according to reception quality of the corresponding packets in the plurality of broadcast data synchronized in the process; including.

  Therefore, according to the broadcast receiving apparatus and the broadcast receiving method of the present invention, the reception sensitivity can be increased by the diversity effect. Further, it is possible to prevent content from being interrupted in the middle or the same content from being output repeatedly. In addition, since it is not necessary to provide a plurality of decoders, the device configuration can be simplified and reduced in size, and the manufacturing cost can be reduced.

Embodiment 1
An embodiment of the present invention will be described. FIG. 1 is a block diagram showing the overall configuration of the broadcast receiving apparatus 1 according to the present embodiment. First, the basic configuration and basic operation of the broadcast receiving apparatus 1 will be described with reference to FIG.

(1. Basic configuration and basic operation)
As shown in FIG. 1, the broadcast receiver 1 includes a first tuner 101, a first demodulator 102, a second tuner 109, a second demodulator 110, a switch 103, a buffer 104, a selection processing unit 105, A decoder 106, a selection processing control unit 107, and a delay correction control unit 108 are provided.

  The first tuner 101 selects a radio wave, receives a broadcast, and outputs the received broadcast signal to the first demodulator 102. Similarly, the second tuner 109 selects a radio wave, receives a broadcast, and outputs the received broadcast signal to the first demodulator 102.

  In the following description, the content received by the first tuner 101 and the content received by the second tuner 109 are the same (common content), but broadcast data received by both tuners. A case where there is a delay will be described. As an example of such a case, for example, the reception channel of the first tuner is a normal broadcast channel, and the same broadcast data as the normal broadcast is sent to the area where the reception channel of the second tuner does not reach the normal broadcast. For example, the channel may be retransmitted.

  The first demodulator 102 demodulates the broadcast signal received by the first tuner 101 to generate broadcast data, and outputs the broadcast data to the switch 103 and the delay correction control unit 108. Similarly, the second demodulator 110 demodulates the broadcast signal received by the second tuner 109 to generate broadcast data, and outputs the broadcast data to the switch 103 and the delay correction control unit 108. Further, the first demodulator 102 and the second demodulator 110 add flag information indicating whether or not an error is included in the packet to the broadcast data and output it.

  Examples of broadcast data include TS (Transport Stream) format data standardized by MPEG-2 (Moving Picture Expert Group Phase 2). In this case, broadcast data is divided into units called packets, and compressed video and audio data is stored in each packet.

  Based on the switching control signal input from the delay correction control unit 108, the switch 103 outputs either the first broadcast data or the second broadcast data to the buffer 104, and outputs the other to the selection processing unit. The switching operation is performed as follows. For example, when the first broadcast data is input to the buffer 104 to be delayed, the switching state shown in FIG. 2B is set, and when the second broadcast data is input to the buffer 104 to be delayed, the switching state shown in FIG. The switching state shown in FIG.

  The buffer 104 delays the broadcast data input from the switch 103 by a delay amount corresponding to the delay amount control signal input from the delay correction control unit 108 and outputs the delayed data to the selection processing unit 105.

  The delay correction control unit 108 includes a delay amount detection unit 108a, a switching control unit 108b, and a correction amount control unit 108c.

  The delay amount detection unit 108a receives broadcast data (hereinafter referred to as first broadcast data) input from the first demodulator 102 and broadcast data (hereinafter referred to as second broadcast data) input from the second demodulator 110. (Referred to as “broadcast data”) and a delay amount of one broadcast data with respect to the other broadcast data is detected. Then, the detected delay amount is output to the switching control unit 108b and the correction amount control unit 108c.

  Based on the delay amount detected by the delay amount detection unit 108a, the switching control unit 108b outputs the delayed broadcast data from the switch 103 to the selection processing unit 105, and the other broadcast data from the switch 103 to the buffer 104. A switch control signal for outputting to the switch 103 is generated and sent to the switch 103.

  The correction amount control unit 108 c generates a delay amount control signal for instructing the delay amount in the buffer 104 based on the delay amount detected by the delay amount detection unit 108 a and notifies the buffer 104 of the delay amount control signal. As described above, the buffer 104 delays the broadcast data input from the switch 103 by a delay amount based on the delay amount control signal and outputs the delayed data to the selection processing unit 105. As a result, the delay amount between the first broadcast data and the second broadcast data input to the selection processing unit 105 can be corrected to zero. That is, the first broadcast data and the second broadcast data can be synchronized. The details of the delay amount detection method and the delay amount correction method will be described later.

  The selection processing control unit 107 includes an error detection unit 107a and a selection control unit 107b. The error detection unit 107a detects whether or not an error is included in the packets included in the first broadcast data and the second broadcast data. The selection control unit 107b determines which one of the first broadcast data and the second broadcast data is used in units of packets according to the detection result of the error detection unit 107a, and the selection control indicating the determination result A signal is generated and sent to the selection processing unit 105. The details of the selection control signal generation method will be described later.

  The selection processing unit 105 receives one broadcast data from the switch 103 and receives the other broadcast data from the buffer 104. Then, the selection processing unit 105 performs processing for selecting one of the input two broadcast data (a plurality of packets) in units of packets based on the selection control signal input from the selection processing control unit 107, The selected broadcast data packet is output to the decoder 106. That is, the selection processing unit 105 switches the broadcast data output to the decoder 106 between the first broadcast data and the second broadcast data based on the selection control signal input from the selection processing control unit 107.

  The decoder 106 decodes the packet input from the selection processing unit 105 to generate a video signal and an audio signal, and outputs them to a display unit and an audio output unit (both not shown).

(2. Delay amount detection method and delay amount correction method)
Next, a delay amount detection method and a delay amount correction method in the delay correction control unit 108 will be described.

  FIG. 3 is an explanatory diagram showing a configuration of broadcast data input to the delay amount detection unit 108a. As described above, each broadcast data is composed of a plurality of packets. Then, as shown in FIG. 3, time information (PCR in the example of FIG. 3) indicating the time of the broadcast data is periodically inserted into the packet. In the MPEG-2 standard, 48-bit data represented by a 27 MHz clock count value called PCR (Program Clock Reference) is defined as the time information. The PCR is originally inserted in order to match the clocks of the broadcasting station and the receiver.

  FIG. 4 is an explanatory diagram showing a delay amount of the first broadcast data input to the delay amount detection unit 108a with respect to the second broadcast data. In the present embodiment, the first broadcast data and the second broadcast data are generated by the same system. Therefore, except for the delay shown in FIG. 4, both broadcast data are exactly the same data. Therefore, the delay amount detection unit 108a extracts time information to be inserted into the first broadcast data and the second broadcast data, and calculates the delay amount by comparing the time information of the extracted broadcast data. be able to.

FIG. 5 is an explanatory diagram illustrating a method of calculating the delay amount. In the example shown in this figure, PCR1 included in the first broadcast data is received at time t1, and PCR0 included in the second broadcast data is received at time t2. Here, since the PCR is periodically inserted into each broadcast data as described above, the time interval between PCR0 and PCR1 in each broadcast data is constant. Therefore, PCR1 included in the second broadcast data is input at time t3, and as shown in FIG. 5, the delay amount T for the first broadcast data in the second broadcast data is:
Delay amount T = t3-t1 = (t2-t1) + K (PCR1-PCR0)
It becomes. Note that K is a conversion coefficient for matching the reception time and the unit of PCR. Assuming that the unit of the reception time and the delay amount is [msec], the PCR is a count value of 27 MHz clock as described above, so K = 1 / 27.000.

  In the case of FIG. 5, the switching control unit 108 b sends a switching control signal to the switch 103 so that the first broadcast data is output to the buffer 104 and the second broadcast data is output to the selection processing unit 105. If the first broadcast data is delayed with respect to the second broadcast data, the second broadcast data is output to the buffer 104 and the first broadcast data is output to the selection processing unit 105. Thus, a switch control signal is sent to the switch 103.

  In addition, the correction amount control unit 108 c sends a delay amount control signal corresponding to the delay amount T detected by the delay amount detection unit 108 a to the buffer 104. As a result, as shown in FIG. 6, the first broadcast data is delayed and output by the buffer 104 by the delay amount T, and the selection processor 105 receives the first broadcast data and the second broadcast data from each other. It is input in a state where there is no delay (a state where the PCR of both broadcast data appears at the same time). That is, the first broadcast data and the second broadcast data can be input to the selection processing unit 105 in a synchronized state.

(3. Selection control signal generation method)
Next, an error detection method and a selection control signal generation method in the selection processing control unit 107 will be described.

  When receiving broadcast data, for example, a signal that hinders reception due to various factors such as reflection from a building is received together with the original broadcast data. For this reason, an error may occur in a part of both the first broadcast data and the second broadcast data.

  FIG. 7 is an explanatory diagram for explaining an example of an operation in the selection processing control unit 107 when an error is included in broadcast data. FIG. 7 shows “first broadcast data (before delay correction)”, “first broadcast data (after delay correction)”, and “second broadcast data” in order from the top.

  In the example shown in this figure, in the first broadcast data and the second broadcast data, a reception error has occurred at the same time indicated by shading, and an error is mixed in a packet including this shaded portion. . That is, the reception error e1 in the first broadcast data and the reception error e1 'in the second broadcast data occur at the same time. In addition, a reception error e2 in the first broadcast data and a reception error e2 'in the second broadcast data occur simultaneously.

  The first demodulator 102 and the second demodulator 110 detect whether or not an error is included in the packet to be written, and add flag information indicating whether or not the packet includes an error.

  Thereafter, delay correction processing is performed using the time information multiplexed by the switch 103, the buffer 104, and the delay correction control unit 108, and the selection processing unit 105 and the selection processing control unit 107 receive the first broadcast after delay correction. Data and second broadcast data are input. Therefore, as shown in FIG. 7, the first broadcast data (after delay correction) and the second broadcast data input to the selection processing unit 105 and the selection processing control unit 107 and the position of the packet where the error occurred ( The time is off.

  For each packet of the first broadcast data and the second broadcast data, the error detection unit 107a refers to a flag (a flag indicating whether or not an error is included) included in the packet, and an error is detected in the packet. Whether or not is included is determined. Then, the determination result is sent to the selection control unit 107b.

  The selection control unit 107 b generates a selection control signal for causing the decoder 106 to input a broadcast data packet that does not include an error, and sends the generated selection control signal to the selection processing unit 105 to select the selection processing unit 105. To control.

  For example, in the case of FIG. 7, the selection control signal is generated so that the first broadcast data is selected in the periods A and C, and the second broadcast data is selected in the periods B and D.

  As shown in FIG. 7, the break of each period is a point where the received data contains an error.

  In addition, when neither of the packets corresponding to each other in the first broadcast data and the second broadcast data includes an error, or when both of the corresponding packets include an error, which broadcast Data may be selected.

  As described above, in the broadcast receiving apparatus 1 according to the present embodiment, the delay correction control unit 108 controls the operation of the switch 103 and the buffer 104, and the first broadcast data and the second broadcast data input to the selection processing unit 105. Synchronize broadcast data. In addition, the selection processing control unit 107 controls the operation of the selection processing unit 105, and outputs, to the decoder 106, packets that do not contain an error among the corresponding packets in the first broadcast data and the second broadcast data. Let

  Thus, as shown in FIG. 7, even if errors occur simultaneously in the first broadcast data and the second broadcast data, both broadcast data input to the selection processing unit 105 are delayed by delaying one of the broadcast data. It is possible to change the position of the error in the broadcast data. For this reason, it is possible to reduce the probability that errors occur simultaneously in both broadcast data input to the selection processing unit 105. Therefore, even when receiving a broadcast in an environment where it is difficult to receive a broadcast such as a shadow of a building, it is possible to select broadcast data with no error and input it to the decoder. And the probability of errors being mixed into content such as video and audio can be reduced.

[Embodiment 2]
Another embodiment of the present invention will be described. For convenience of explanation, members having the same functions as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and description thereof is omitted.

  In the first embodiment, it is determined whether or not an error is included in each packet of the first broadcast data and the second broadcast data, and an error is included in both of the packets corresponding to each other in the both broadcast data. In this case, either broadcast data may be selected. On the other hand, in this embodiment, the BER (Bit Error Ratio) value (bit error ratio) of both broadcast data is measured, and a packet included in the broadcast data with the smaller BER value is selected.

  FIG. 8 is a block diagram showing a schematic configuration of the broadcast receiving apparatus 1b according to the present embodiment. As shown in this figure, the broadcast receiving apparatus 1b includes a first demodulator in place of the first demodulator 102, the second demodulator 110, and the selection processing control unit 107 in the broadcast receiving apparatus 1 of the first embodiment. 801, a second demodulator 802, and a selection processing control unit 803. The other configuration of the broadcast receiving device 1b is the same as that of the broadcast receiving device 1 of the first embodiment.

  The first demodulator 801 demodulates the broadcast signal received by the first tuner 101 to generate broadcast data, and outputs the broadcast data to the switch 103 and the delay correction control unit 108. Similarly, the second demodulator 802 demodulates the broadcast signal received by the second tuner 109 to generate broadcast data, and outputs the broadcast data to the switch 103 and the delay correction control unit 108.

  In addition, the first demodulator 801 and the second demodulator 802 measure the BER value of the received broadcast data and transmit the measurement result to the selection processing control unit 803.

  The selection process control unit 803 includes a BER value comparison unit 803a and a selection control unit 803b.

  The BER value comparison unit 803a compares the BER values of the corresponding packets in the first broadcast data and the second broadcast data, and sends the comparison result to the selection control unit 803b.

  The selection control unit 803b performs processing for generating a selection control signal for each packet so as to select a packet included in broadcast data with a smaller BER value according to the comparison result of the BER value comparison unit 803a. A selection control signal is sent to the selection processing unit 105.

  Note that the broadcast data selection processing in the selection processing unit 105 is performed after the delay amount correction processing by the switch 103, the buffer 104, and the delay correction control unit 108 as described above. For this reason, the BER value is input from the first demodulator 801 and the second demodulator 802 to the selection processing control unit 803 until the determination processing is performed in the selection processing control unit 803 (or the selection processing unit 105). There is a time lag until the selection process is performed in FIG. Therefore, considering the time lag from when the BER value is measured by the first demodulator 801 and the second demodulator 802 to when the above process determination is made by the selection processing control unit 803, the first demodulator 801 and the second demodulator 801 A storage unit that temporarily stores the BER value measured by the second demodulator 802 may be provided, and the selection processing control unit 803 may appropriately read the BER value from the storage unit and perform the determination process.

  Alternatively, a storage unit that temporarily stores the selection control signal generated by the selection processing control unit 803 is provided, and the selection control signal stored in the storage unit is output to the selection processing unit 105 at an appropriate timing considering the time lag. You may make it make it. In this case, the required memory capacity can be reduced as compared with the case where the BER value corresponding to each packet is held. Even in such a case, there is almost no influence on the accuracy of error determination except when the radio wave condition changes rapidly.

  As described above, in the broadcast receiving apparatus 1b according to the present embodiment, the delay correction control unit 108 controls the operation of the switch 103 and the buffer 104, and the first broadcast data and the second broadcast data input to the selection processing unit 105. Synchronize broadcast data.

  As a result, as in the case of the first embodiment, it is possible to reduce the probability that errors occur simultaneously in both broadcast data input to the selection processing unit 105.

  Also, in the broadcast receiving device 1b according to the present embodiment, the selection processing control unit 107 controls the operation of the selection processing unit 105, and the BER among the packets corresponding to each other in the first broadcast data and the second broadcast data. A packet having a small value is output to the decoder 106. For this reason, even if an error is included in both the first broadcast data and the second broadcast data, a packet with a low error rate can be selected and output to the decoder. Therefore, it is possible to increase the probability that content such as video and audio can be correctly reproduced by error recovery processing of the decoder.

  In each of the above embodiments, the delay amount detection unit 108a calculates the delay amount between the received first and second broadcast data based on the time information included in both broadcast data. However, the present invention is not limited to this. It is not a thing. For example, the broadcast station may obtain a delay amount at the time of reception in advance and include the delay amount in the broadcast data as attribute information. The parameter value of the attribute information included in the broadcast data may be, for example, a delay amount of zero for the reference channel and a difference from the reference channel for the other channels.

  As described above, when the delay amount is included as attribute information in the broadcast data, the delay amount detection unit 108a may detect the delay amount based on the attribute information included in each broadcast data. Thereby, the configuration of the delay amount detection unit 108a can be simplified. Alternatively, the delay amount detection unit 108a may be omitted, and the switching control unit 108b and the correction amount control unit 108c may perform switching control and correction amount control based on attribute information included in the broadcast data. Thus, the configuration of the delay correction control unit 108 can be simplified by omitting the delay amount detection unit 108a.

  In each of the above embodiments, the configuration including two sets of the tuner and the demodulator has been described. However, the present invention is not limited to this. For example, instead of one of the two sets, an interface that receives an input from another communication path may be provided. For example, a network interface (wired or wireless) for receiving data transmitted via a communication network such as the Internet, broadcast data obtained by receiving broadcast radio waves, broadcast data received via a network, It is good also as a structure using. In this case, for example, even in places where it is difficult to receive broadcast radio waves, broadcast data can be received through another communication path such as the Internet, and the service area can be expanded.

  Moreover, it is good also as a structure provided with 3 or more sets of tuners and demodulators. In this case, N−1 buffers 104 are provided for the number N of tuner / demodulator pairs (N is an integer of 3 or more). Then, the switching control unit 108b outputs the most delayed broadcast data among the broadcast data received in each group from the switch 103 to the selection processing unit 105, and inputs the other broadcast data to different buffers. The switch control signal is generated and sent to the switch 103. Further, the correction amount control unit 108 c sends a delay control signal for synchronizing each broadcast data input to the selection processing unit 105 to each buffer. In addition, the selection processing control unit 107 generates a selection control signal so as to select a packet that does not include an error among packets corresponding to each other in each broadcast data, and sends the selection control signal to the selection processing unit 105. Alternatively, the selection processing control unit 803 generates a selection control signal so as to select a packet having the smallest BER value from among corresponding packets in each broadcast data, and sends the selection control signal to the selection processing unit 105.

  In each of the above embodiments, each unit (each block) included in the broadcast receiving device 1 or 1b is realized by software using a processor such as a CPU. In other words, the broadcast receiving apparatuses 1 and 1b include a CPU (central processing unit) that executes instructions of a control program that realizes each function, a ROM (read only memory) that stores the program, and a RAM (random access) that expands the program. memory), a storage device (recording medium) such as a memory for storing the program and various data. An object of the present invention is a recording in which the program code (execution format program, intermediate code program, source program) of the control program of the broadcast receivers 1 and 1b, which is software that realizes the above-described functions, is recorded in a computer-readable manner This is achieved by supplying the medium to the broadcast receiving apparatuses 1 and 1b and reading and executing the program code recorded on the recording medium by the computer (or CPU or MPU).

  Examples of the recording medium include tapes such as magnetic tapes and cassette tapes, magnetic disks such as floppy (registered trademark) disks / hard disks, and disks including optical disks such as CD-ROM / MO / MD / DVD / CD-R. Card system such as IC card, IC card (including memory card) / optical card, or semiconductor memory system such as mask ROM / EPROM / EEPROM / flash ROM.

  Further, the broadcast receiving devices 1 and 1b may be configured to be connectable to a communication network, and the program code may be supplied via the communication network. The communication network is not particularly limited. For example, the Internet, intranet, extranet, LAN, ISDN, VAN, CATV communication network, virtual private network, telephone line network, mobile communication network, satellite communication. A net or the like is available. Also, the transmission medium constituting the communication network is not particularly limited. For example, even in the case of wired such as IEEE 1394, USB, power line carrier, cable TV line, telephone line, ADSL line, etc., infrared rays such as IrDA and remote control, Bluetooth ( (Registered trademark), 802.11 wireless, HDR, mobile phone network, satellite line, terrestrial digital network, and the like can also be used. The present invention can also be realized in the form of a computer data signal embedded in a carrier wave in which the program code is embodied by electronic transmission.

  In addition, each unit of the broadcast receiving devices 1 and 1b is not limited to that realized using software, and may be configured by hardware logic. Hardware that performs part of the processing and the hardware It may be a combination of arithmetic means for executing software for performing the above control and residual processing.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope shown in the claims. That is, embodiments obtained by combining technical means appropriately modified within the scope of the claims are also included in the technical scope of the present invention.

It is a block diagram which shows schematic structure of the broadcast receiver concerning one Embodiment of this invention. (A) And (b) is explanatory drawing for demonstrating operation | movement of the switch with which the broadcast receiving apparatus shown in FIG. 1 is equipped. It is explanatory drawing which shows the structure of the broadcast data input into the delay amount detection part with which the broadcast receiving apparatus shown in FIG. 1 is equipped. It is explanatory drawing which shows the delay amount of the broadcast data input into the delay amount detection part with which the broadcast receiving apparatus shown in FIG. 1 is equipped. It is explanatory drawing which shows the delay amount in the buffer with which the broadcast receiving apparatus shown in FIG. 1 is equipped. It is explanatory drawing which shows the delay process of the broadcast data in the broadcast receiver shown in FIG. It is explanatory drawing for demonstrating an example of operation | movement of the selection process control part with which the broadcast receiving apparatus shown in FIG. 1 is equipped. It is a block diagram which shows schematic structure of the broadcast receiver concerning other embodiment of this invention.

Explanation of symbols

1, 1b Broadcast receiving apparatus 101 First tuner (receiving means)
102 1st demodulator (reception means, error detection unit)
103 switch (switching part)
104 Buffer 105 Selection processing unit (selection unit)
106 Decoder 107 Selection processing control unit (selection unit)
107a error detection unit 107b selection control unit 108 delay correction control unit (delay correction unit)
108a Delay amount detection unit 108b Switching control unit 108c Correction amount control unit 109 Second tuner (reception means)
110 Second demodulator (reception means, error detection unit)
801 First demodulator (error rate detection unit)
802 Second demodulator (error rate detection unit)
803 Selection processing control unit (selection unit)
803a BER value comparison unit (error occurrence rate detection unit)
803b Selection control unit

Claims (12)

A broadcast receiving device comprising a plurality of receiving means for receiving broadcast data and a decoder for decoding the broadcast data,
A delay correction unit that synchronizes each piece of broadcast data when the plurality of pieces of broadcast data received by different receiving means are broadcast data of common content;
According to reception quality of packets corresponding to each other in a plurality of broadcast data synchronized by the delay correction unit, one of the packets corresponding to each other is selected, and the selected packet is output to the decoder. A broadcast receiving apparatus comprising: a selection unit. An error detection unit for determining whether an error is included in each packet in the broadcast data;
When the plurality of pieces of broadcast data are common content broadcast data, the selection unit selects a packet that does not include an error from packets corresponding to each other in the plurality of pieces of broadcast data, and outputs the selected packet to the decoder. The broadcast receiving apparatus according to claim 1. An error rate detection unit for detecting an error rate of each packet in the broadcast data,
When the plurality of pieces of broadcast data are common content broadcast data, the selection unit selects a packet having the lowest error occurrence rate from among corresponding packets in the plurality of pieces of broadcast data, and outputs the selected packet to the decoder. The broadcast receiving apparatus according to claim 1. The plurality of receiving means include
2. The broadcast receiving apparatus according to claim 1, further comprising two or more receiving means including a tuner for receiving broadcast data and a demodulator for demodulating the broadcast data received by the tuner. The plurality of receiving means include
Receiving means comprising a tuner for receiving broadcast data and a demodulator for demodulating the broadcast data received by the tuner;
The broadcast receiving apparatus according to claim 1, further comprising a receiving unit having an interface for receiving broadcast data transmitted via a communication network. The delay correction unit is
A buffer that delays the input broadcast data and outputs it;
A switching unit for switching broadcast data input to the buffer;
A delay amount detection unit for detecting a delay amount between the broadcast data;
A switching control unit that determines broadcast data to be input to the buffer based on the delay amount detected by the delay detection unit, and controls the operation of the switching unit;
The broadcast receiving apparatus according to claim 1, further comprising: a correction amount control unit that controls an output timing of broadcast data in the buffer based on a delay amount detected by the delay detection unit.   The broadcast receiving apparatus according to claim 6, wherein the delay amount detection unit detects a delay amount using time information included in broadcast data.   8. The broadcast receiving apparatus according to claim 7, wherein the time information is PCR in the MPEG-2 standard.   The broadcast receiving apparatus according to claim 6, wherein the delay amount detection unit detects a delay amount between the broadcast data using delay amount information included in the broadcast data. A broadcast receiving method in a broadcast receiving apparatus comprising a plurality of receiving means for receiving broadcast data and a decoder for decoding the broadcast data,
When a plurality of broadcast data received by different receiving means are broadcast data of common content, a delay correction step for synchronizing each of the broadcast data,
According to reception quality of packets corresponding to each other in a plurality of broadcast data synchronized by the delay correction step, one of the packets corresponding to each other is selected, and the selected packet is output to the decoder. A broadcast receiving method comprising: a selecting step.   A program for operating the broadcast receiving apparatus according to claim 1 for causing a computer to function as each of the units.   The computer-readable recording medium which recorded the broadcast receiving program of Claim 11.

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