JP2017005613A - Broadcast receiver, method and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve high-speed packet synchronization.SOLUTION: A slot detection unit supplies a transmission signal composed of a plurality of slots to a synchronous signal insertion unit, to detect the top of the slots from the transmission signal, so as to supply the detection result to the synchronous signal insertion unit. Based on the detection result of the slot top, the synchronous signal insertion unit analyzes a slot header of the slot constituting the transmission signal to delete the slot header, and further, based on the analysis result of the slot header, inserts an S identifier into the slot to form a slot data series. The synchronous signal detection unit detects the S identifier from the slot data series supplied from the synchronous signal insertion unit, so as to perform packet synchronization. The present technique is applicable to a broadcast receiver.SELECTED DRAWING: Figure 5

Description

  The present technology relates to a broadcast receiver, method, and program, and more particularly, to a broadcast receiver, method, and program that can perform packet synchronization at higher speed.

  For example, in MPEG-2 TS (Moving Picture Experts Group-2 Transport Stream) standard (MPEG system layer ISO / IEC13818-1), TS header first sync byte (0x47) and TS packet fixed length as TS layer packet synchronization The packet was detected by matching the 188 bytes of multiple times.

  That is, if sync bytes are detected a plurality of times for every 188 bytes, which is a fixed packet length of TS packets, packet synchronization is established, and each TS packet is detected correctly from the data series. When a TS packet is detected, a header and a payload are extracted from the TS packet, and PES (Packetized Elementary Stream) / ES (Elementary Stream) is processed.

  Incidentally, the ISDB-T standard is known as a standard for digital broadcasting. In this standard, it is possible to multiplex a plurality of video data of different image quality, data other than video and audio, etc., and transmit them simultaneously in one channel. Further, in the MMT (MPEG Media Transport) standard adopted in the ISDB-T standard, the packet structure of a TLV (Type Length Value) packet in the lowest layer is defined (for example, see Non-Patent Document 1).

ARIB STD-B32 3.5 edition Radio Industries Association

  However, when such a TLV packet is used, it is difficult for the broadcast receiver on the transmission signal receiving side to synchronize the TLV packet at high speed.

For example, a TLV packet is a variable-length packet, and the packet length is 2 ¹⁶ bits (= 8192 bytes) at the maximum. Therefore, the packet length of the TLV packet is significantly longer than the packet length of the TS packet.

For this reason, it is difficult to perform a high-speed packet synchronization similar to a TS packet with a combination of the first 8 bits of a TLV packet and a packet length of 2 ¹⁶ bits, and the processing amount is large.

  The present technology has been made in view of such a situation, and enables packet synchronization to be performed at higher speed.

  A broadcast receiver according to an aspect of the present technology includes a synchronization signal insertion unit that generates a slot data string by inserting a synchronization signal used for packet synchronization at a fixed length interval into a slot in which a packet is stored, and the slot data And a synchronization signal detector that performs packet synchronization of the packet by detecting the synchronization signal from the column.

  The synchronization signal may include fixed value information which is a predetermined value and packet position information regarding the position of the packet in the slot data string.

  The packet position information may be information indicating a head position of the packet between the synchronization signals.

  The synchronization signal insertion unit can generate the packet position information based on an analysis result of a slot header included in the slot.

  The synchronization signal inserting unit can delete the slot header included in the slot and insert the synchronization signal into the slot to generate the slot data string.

  The fixed length interval may be shorter than the maximum packet length that the packet can take.

  The packet may be a variable length packet.

  The packet may be a TLV packet.

  The synchronization signal detection unit can generate the packet by deleting the synchronization signal from the slot data string.

  The synchronization signal insertion unit may store the slot in a memory area shorter than the packet length, and insert the synchronization signal into the slot stored in the memory area.

  The synchronization signal detection unit may store the slot data string in a memory area shorter than the packet length, and detect the synchronization signal from the slot data string stored in the memory area.

  The reception method or program according to one aspect of the present technology generates a slot data string by inserting a synchronization signal used for packet synchronization at a fixed length interval into a slot in which a packet is stored, and generates the slot data string from the slot data string A step of performing packet synchronization of the packet by detecting a signal;

  In one aspect of the present technology, a slot data string is generated by inserting a synchronization signal used for packet synchronization at a fixed length interval into a slot in which a packet is stored, and the synchronization signal is detected from the slot data string Thus, packet synchronization of the packet is performed.

  According to one aspect of the present technology, packet synchronization can be performed at higher speed.

  Note that the effects described here are not necessarily limited, and may be any of the effects described in the present disclosure.

It is a figure which shows the protocol stack of the broadcast system which employ | adopted the MMT system. It is a figure which shows the packet structure of a TLV packet. It is a figure which shows the relationship between a slot and a TLV packet. It is a figure which shows the structure of a slot header. It is a figure which shows the structural example of a broadcast receiver. It is a figure which shows the example of the slot data sequence by which S identifier was inserted. It is a flowchart explaining a reception process. It is a flowchart explaining an insertion process. It is a flowchart explaining a synchronous process. It is a figure which shows the structural example of a computer.

  Hereinafter, embodiments to which the present technology is applied will be described with reference to the drawings.

<First Embodiment>
<Outline of this technology>
The present technology relates to a broadcast receiver that receives a transmission signal that has been digitally broadcast. Specifically, the synchronization signal for packet synchronization is fixed to the data of the transmission signal exchanged between the demodulator that demodulates the transmission signal and the demultiplexer that extracts and processes the TLV packet from the transmission signal. By inserting at long intervals, packet synchronization can be performed at higher speed.

  In this technique, since the synchronization signal is inserted in the data of the transmission signal, the bit rate is increased. However, the bit rate of the transmission signal is increased only between the demodulation unit and the demultiplexer unit. There is no impact on the whole.

  Further, according to the present technology, the value and length of the synchronization signal to be inserted into the data of the transmission signal, and the fixed length interval at which the synchronization signal is inserted can be arbitrarily set. Therefore, the synchronization signal and the fixed length interval can be appropriately set according to the bit rate of the transmission signal and the system for processing the transmission signal.

  For example, the present technology can be applied not only to the ISDB-T standard but also to the broadcast standard of other countries such as ATSC30 in which the MMT standard is adopted.

  In the following, a case where packet synchronization of a TLV packet that is a variable-length packet is described as an example, but the present technology can also be applied to other packets such as a TS packet. For example, even when this technology is applied to a fixed-length packet with a fixed packet length, if the fixed-length interval between synchronization signals is made shorter than the packet length, packet synchronization is performed using only the packet header. It is possible to synchronize packets faster than the case. As a result, the memory capacity for temporarily holding packets can be further reduced.

  Then, the present technology will be described in more detail below.

  First, the MMT standard adopted in the ISDB-T standard will be described.

  The MMT standard (MMT method) is a media transport method that assumes the introduction of a broadcasting and communication cooperation service. Fig. 1 shows the protocol stack of a broadcasting system that employs the MMT method.

  In the protocol stack of FIG. 1, the lowest layer is a physical layer indicated by the characters “broadcast”. In the MMT method, not only transmission via broadcasting but also some data may be transmitted via communication. However, when transmission via broadcasting is performed, the physical layer has a frequency band assigned to each physical channel. Will respond.

  The upper layers of the physical layer are a TLV layer and a UDP / IP (User Datagram Protocol / Internet Protocol) layer. In addition, the MMT method is adopted as a media transport layer for providing a function of converting components such as video and audio constituting broadcast content into a format suitable for transmission and use.

  In the MMT system, video data encoded with High Efficiency Video Coding (HEVC) and audio data encoded with Advanced Audio Coding (AAC) are in the MFU / MPU (Media Fragment Unit / Media Processing Unit) format. The MMTP packet is put on an MMTP (MMT Protocol) payload and transmitted as an IP packet.

  In addition, data content and subtitle signals related to broadcast content are also in MFU / MPU format, are converted into MMTP packets on the MMTP payload, and are transmitted as IP packets. On the other hand, a part of data content, files necessary for EPG (Electronic Program Guide), engineering service, etc. are transmitted using the data transmission method on the IP without using the MMT method. Similarly, a content download service or the like uses an IP data transmission method.

  In the broadcast transmission path, IP packets are transmitted in the form of TLV packets.

  Here, one IP packet or an IP packet obtained by compressing one header is transmitted as one TLV packet. In addition to these media data, control information is transmitted.

  In addition to the mechanism for transmitting these media data, two types of transmission control signals, MMT-SI and TLV-SI, are provided.

  MMT-SI is a transmission control signal indicating the configuration of broadcast content. MMT-SI is an MMT control message format, is carried on an MMTP payload, is converted into an MMTP packet, and is transmitted as an IP packet. TLV-SI is a transmission control signal related to multiplexing of IP packets, and provides information for channel selection and correspondence information between services and IP addresses. In the broadcasting system, NTP (Network Time Protocol) is transmitted as time information for providing absolute time.

  In the MMT standard, the packet structure of the TLV packet corresponding to the TLV layer is as shown in FIG.

  In the TLV packet shown in FIG. 2, the first 8-bit portion is “01111111”, and this portion is a fixed bit (fixed value) used to detect the first portion of the TLV packet. In 8 bits following this fixed bit, information indicating the type of packet stored in the TLV packet is described.

  Furthermore, in the subsequent 16-bit portion, data stored in the TLV packet, that is, a data length indicating the length of the payload following the 16-bit portion is described. Hereinafter, the information indicating the data length is also referred to as TLV packet length information.

Further, following the TLV packet length information, variable length 8 × N-bit data is arranged. Therefore, the TLV packet is a variable-length packet having a maximum length of 2 ¹⁶ bits.

  In a TLV packet, a 32-bit portion from a fixed bit to a portion in which TLV packet length information is described, that is, a 32-bit portion from the beginning of the TLV packet is a header portion. Hereinafter, the header of the TLV packet is particularly referred to as a TLV header.

When such a TLV packet is synchronized on the receiving side, as described above, the same amount of packet synchronization as a TS packet can be achieved by combining the first 8 bits of the TLV packet and the 2 ¹⁶ bits of the packet length. Is difficult. That is, since the packet length of the TLV packet is long, it takes time for packet synchronization. In addition, since the TLV packet is a variable-length packet, some contrivance is required for packet synchronization.

  Therefore, it is conceivable to perform packet synchronization of TLV packets by using slot delimiters used for transmission of TLV packets.

  For example, Table 2-1 “Overview of transmission line coding scheme” in Chapter 2 of ARIB B44 specifies transmission control in units of slots, and it can be seen that TLV packets are stored in slots and transmitted.

  In addition, in the second chapter of ARIB B44, for the transmission control signal (TMCC signal), in addition to the function of the same signal in the broadband transmission method, functions such as control for transmitting variable-length packets such as IP packets were added. The effect is described. From this, it is understood that the unit of demodulation and deinterleaving is a slot unit.

  In the case of the MMT standard, although the slot length is not specified, there is a high possibility that it will be defined as 1500 bytes (ARIB STD B21 Table 11-22), which is the same as the Ethernet (registered trademark) MTU (Maximum Transmission Unit).

  Here, FIG. 3 shows the relationship between the slot and the TLV packet when the TLV packet is stored in the slot and transmitted. In FIG. 3, the left side in the figure indicates the beginning side of the slot, and the right side in the figure indicates the end side of the slot. In the figure, it is assumed that each slot is transmitted in order from the upper slot to the lower slot. Further, at the time of broadcasting, each slot is transmitted in order from the slot head side.

  In FIG. 3, the rectangle drawn on the right side of the characters “SLOT # 1” to “SLOT # 3” represents one slot. In the following, for example, the slot indicated by the characters “SLOT # 1” Each slot is described separately as needed, such as slot SLOT # 1.

  A slot header indicated by the characters “SLOT header” is arranged at the head of each slot, and the TLV packets are sequentially arranged and stored behind the slot header.

  In FIG. 3, rectangles with characters “TLV # 1” to “TLV # 5” represent TLV packets. Hereinafter, for example, a TLV packet indicated by the characters “TLV # 1” is described by distinguishing each TLV packet as necessary, such as a TLV packet TLV # 1.

  For example, in the first slot SLOT # 1, a part of the TLV packet TLV # 1, a part of the TLV packet TLV # 2, and a part of the TLV packet TLV # 3 are stored in order. Part of the TLV packet TLV # 3 is stored in the second slot SLOT # 2. In the third slot SLOT # 3, a part of the TLV packet TLV # 3, the TLV packet TLV # 4, and the TLV packet TLV # 5 are stored in order.

  Therefore, in this example, one TLV packet TLV # 3 is divided into three, and it can be seen that each data of the divided packets is stored in each of the slots SLOT # 1 to SLOT # 3. .

  Although only three slots are illustrated here, there are actually some slots before the slot SLOT # 1, and some slots continue after the slot SLOT # 3.

  The configuration of the slot header arranged at the head of each slot is as shown in FIG. That is, in the slot header, head TLV indication information is stored in the head 16-bit portion, and the 160-bit portion following the 16-bit portion is undefined.

  The head TLV instruction information is pointer information indicating the position of the head TLV packet in the slot. More specifically, the head TLV instruction information is information indicating the length (number of bytes) from the last position of the slot header to the head position of the head TLV packet.

  Here, the head TLV packet is a TLV packet arranged (stored) at a position closest to the head of the slot among TLV packets stored in the slot in a state including the TLV header. That is, the head TLV packet is a TLV packet whose TLV header is closest to the slot header among the TLV packets in the slot.

  Therefore, for example, in slot SLOT # 1, TLV packet TLV # 2 becomes the first TLV packet, so the slot header of slot SLOT # 1 describes information indicating the head position of TLV packet TLV # 2 as head TLV instruction information Is done.

  In addition, for example, a part of the divided TLV packet TLV # 3 is stored in the slot SLOT # 2, but the part of the TLV packet TLV # 3 stored in the slot SLOT # 2 includes the head part. Not. Therefore, this TLV packet TLV # 3 is not the first TLV packet in the slot SLOT # 2. As described above, since the head TLV packet does not exist in the slot SLOT # 2, the value “0xFFFF” indicating that the head TLV packet does not exist is described as the head TLV instruction information in the slot header of the slot SLOT # 2. .

  Furthermore, since the TLV packet TLV # 4 becomes the first TLV packet in the slot SLOT # 3, information indicating the head position of the TLV packet TLV # 4 is described in the slot header of the slot SLOT # 3 as the head TLV instruction information. The

  When transmitting TLV packets in slot units in this way, if the start position of each slot included in the transmission signal is known from the structure of the slot, the start TLV packet is analyzed by analyzing the slot header of those slots. Can be specified.

  A broadcast receiver that receives and processes a transmission signal includes a demodulation unit that demodulates the transmission signal and a demultiplexer unit that extracts and processes a TLV packet from the transmission signal. In the broadcast receiver, the demodulator detects the slot head from the transmission signal, and the demultiplexer performs packet synchronization of the TLV packet and extraction of the TLV packet from the slot.

  At this time, if a slot head signal indicating the head of the slot and a slot header are supplied from the demodulator to the subsequent demultiplexer, the demultiplexer detects the start position of the TLV packet and performs packet synchronization. And packet analysis can be started.

However, as mentioned above, the maximum length of a TLV packet is 2 ¹⁶ bits, so if you synchronize by matching the fixed bits of a TLV packet in a slot multiple times, a delay occurs until the packet synchronization is completed Resulting in.

  Also, if the TLV packet length is 1500 bytes, which is the length of the MTU, it will be longer than 188 bytes in the case of MPEG2-TS. It will be late to start the analysis.

  Therefore, in this technology, in a system that transmits data using TLV packets, packet synchronization can be performed at higher speed.

  Specifically, in a broadcast receiver that receives a transmission signal including a plurality of slots, a synchronization signal for synchronizing a TLV packet is inserted for each fixed byte length in a data sequence including a plurality of slots. . As a result, the TLV packet can be synchronized using the synchronization signal, and the packet synchronization can be performed at a higher speed.

<Configuration example of broadcast receiver>
Subsequently, specific embodiments to which the present technology is applied will be described. A broadcast receiver to which the present technology is applied is configured, for example, as shown in FIG.

  The broadcast receiver 11 illustrated in FIG. 5 includes an antenna 21, a demodulation unit 22, and a demultiplexer unit 23.

  The antenna 21 receives the broadcast transmission signal and supplies it to the demodulation unit 22. The demodulator 22 demodulates the transmission signal supplied from the antenna 21, detects a slot from the transmission signal, and supplies the detected slot to the demultiplexer unit 23.

  The demultiplexer unit 23 detects the TLV packet from the slot supplied from the demodulator 22 and processes the data stored in the TLV packet.

  In the broadcast receiver 11, the demodulator 22 functions as a tuner. For example, the demodulator 22 and the demultiplexer 23 are separated by hardware. That is, for example, the demodulator 22 and the demultiplexer 23 are provided in different IC chips.

  The demodulating unit 22 includes a demodulating unit 31, a TMCC decoding unit 32, a deinterleave / error correcting unit 33, a slot detecting unit 34, and a synchronization signal inserting unit 35.

  Further, the demultiplexer unit 23 includes a synchronization signal detection unit 36, a TLV packet processing unit 37, and an MMT processing unit 38.

  The demodulation unit 31 demodulates the transmission signal by performing quadrature detection on the transmission signal supplied from the antenna 21, supplies the demodulation signal to the deinterleave / error correction unit 33, and converts the TMCC signal included in the transmission signal to the TMCC decoding unit 32. To supply.

  The TMCC decoding unit 32 decodes the TMCC signal supplied from the demodulation unit 31 and supplies it to the deinterleave / error correction unit 33. The TMCC signal includes, for example, information on the modulation scheme, backoff amount, bit rate, etc. of the modulation symbol.

  The deinterleave / error correction unit 33 deinterleaves the transmission signal supplied from the demodulation unit 31 based on the TMCC signal supplied from the TMCC decoding unit 32, performs error correction processing on the transmission signal, and performs slot correction. It supplies to the detection part 34.

  The slot detection unit 34 supplies the transmission signal supplied from the deinterleave / error correction unit 33 to the synchronization signal insertion unit 35 and detects the head position of the slot included in the transmission signal, and the detection result is also the synchronization signal. It supplies to the insertion part 35.

  The synchronization signal insertion unit 35 inserts a synchronization signal into the slot based on the detection result of the leading position of the slot supplied from the slot detection unit 34 and the transmission signal composed of the slot, and the synchronization signal detection unit of the demultiplexer unit 23 36.

  The synchronization signal detection unit 36 detects the synchronization signal from the slot supplied from the synchronization signal insertion unit 35 to synchronize the TLV packet stored in the slot and deletes the synchronization signal from the slot. Is supplied to the TLV packet processing unit 37.

  The TLV packet processing unit 37 extracts data such as video data and audio data from the TLV packet supplied from the synchronization signal detection unit 36 and supplies the data to the MMT processing unit 38. The MMT processing unit 38 performs processing according to the application, such as decoding processing on the data supplied from the TLV packet processing unit 37, and outputs the processed block to the subsequent block.

<About packet synchronization>
Next, packet synchronization of TLV packets performed in the broadcast receiver 11 shown in FIG. 5 will be described.

  As described above, in the broadcast receiver 11, a synchronization signal is inserted into the slot so that packet synchronization can be performed at a higher speed. The synchronization signal is a periodic synchronization identifier inserted into the slot at fixed length intervals. Hereinafter, the synchronization signal is referred to as an S identifier.

  The S identifier includes, for example, fixed value information (fixed bit) which is a predetermined fixed value and TLV position information indicating the length (data length) to the beginning of the TLV packet existing between the next S identifier. And at least.

  Since these fixed value information and TLV position information are each fixed length, the length of the S identifier is also fixed length. For example, when there is a possibility that two or more TLV packet heads exist between adjacent S identifiers, the length of the S identifier is determined so that the TLV position information is included by that number.

  The value of the fixed value information, the length of the S identifier, and the length between the inserted S identifiers are, for example, the bit rate of the processing required by the system of the broadcast receiver 11 and the demultiplexer unit 23, and the insertion of the synchronization signal. It is appropriately determined according to the size of a fixed-length memory provided in the unit 35 and the synchronization signal detection unit 36.

  Further, here, an example in which the TLV position information included in the S identifier is information indicating the length to the beginning of the TLV packet existing until the next S identifier will be described. Any information may be used as long as it can identify the head position of the TLV packet in the slot.

  Such an S identifier is inserted into the slot by the synchronization signal insertion unit 35.

  The synchronization signal insertion unit 35 specifies the slot start position from the detection result of the slot start position supplied from the slot detection unit 34, and analyzes the slot header at the slot start. The position of the first TLV packet in the slot can be specified by analysis of the slot header, that is, by the first TLV indication information in the slot header.

  When the first TLV packet is detected for the first slot, the synchronization signal inserting unit 35 deletes data between the head of the slot and the head TLV packet, analyzes the TLV header of the head TLV packet, and outputs the analysis result. Based on this, S identifiers are inserted continuously at fixed length intervals as appropriate for the first TLV packet and subsequent TLV packets.

  At this time, when a new slot is fetched, the synchronization signal inserting unit 35 analyzes the slot header of the slot to identify the position of the first TLV packet, and deletes the slot header to store the data of the new slot. The S identifier is inserted by connecting to the end of the data of the immediately preceding slot.

  When inserting an S identifier into a slot, it is necessary to generate TLV position information that constitutes the S identifier. The value of this TLV position information, that is, the length (distance) from the S identifier to be inserted to the beginning position of the TLV packet, and whether the beginning of the TLV packet is between the next S identifier, It can be specified from the analysis result of the TLV header.

  That is, the position of the head TLV packet in the slot can be specified from the head TLV instruction information included in the slot header. Then, by analyzing the TLV header of the head TLV packet, the length of the head TLV packet can be determined from the TLV packet length information in the TLV header, so that the head position of the next TLV packet can be specified. Similarly, if the TLV header of the next TLV packet is analyzed, the head position of the next TLV packet can be further specified.

  In this way, by analyzing the slot header of each slot and the TLV header of each TLV packet, it is possible to specify at which position the head of the TLV packet is located in the data string of the consecutively arranged slots. . Therefore, the value of the TLV position information constituting each S identifier can be obtained from the current S identifier insertion position, the fixed-length interval at which the S identifier is inserted, and the head position of each TLV packet.

  Note that the value of the TLV position information described in the S identifier is, for example, the length (bytes) from the end position (last) of the S identifier to the start position of the TLV packet in consideration of the insertion of the S identifier into the slot. Number). If there is no leading TLV packet before the next S identifier, the value of the TLV position information is set to a predetermined value (maximum value) such as “0xFF”.

  When the S identifier is inserted into the transmission signal composed of the slots shown in FIG. 3, for example, by the method described above, the data shown in FIG. 6 is obtained. In FIG. 6, the same characters are written in the portions corresponding to those in FIG. 3, and the description thereof will be omitted as appropriate.

  In the example of FIG. 6, a rectangle with the letter “S” represents fixed value information constituting the S identifier, and “0xFF” and “0x0a” arranged on the right side in each fixed value information diagram. A rectangle in which characters such as “” are written represents TLV position information constituting the S identifier. The characters in the rectangle representing the TLV position information indicate the value of the TLV position information.

  A numerical value in parentheses written together with characters representing each TLV packet indicates what number part of the TLV packet is divided by inserting an S identifier or the like.

  For example, the TLV packet TLV # 2 is composed of data represented by a rectangle with the characters “TLV # 2 (1)” and a rectangle with the characters “TLV # 2 (2)” inserted by the S identifier. It is divided into data represented and data represented by a rectangle with the characters “TLV # 2 (3)”.

  Among them, the data with the character “TLV # 2 (1)” represents the first data in the TLV packet TLV # 2 divided into three, that is, the first data. The data with “# 2 (2)” represents the second data, and the data with the characters “TLV # 2 (3)” represents the third data.

  As can be seen from FIG. 6, in the synchronization signal insertion unit 35, the slot header is removed (deleted) from each slot, and the data of the slots from which the slot header has been removed are connected in the order in which the slots are arranged. In addition, S identifiers are inserted into the data of the connected slots at predetermined fixed length intervals.

  For example, an S identifier consisting of fixed value information and TLV position information whose value is “0x70” is inserted at the beginning of the slot SLOT # 1. Then, as indicated by the value “0x70” of the TLV position information, the value “0x70” is indicated between the S identifier and the next S identifier, that is, from the end of the TLV position information having the value “0x70”. The head portion of the new TLV packet # 2 exists at a position that is behind by the length to be recorded.

  In the slot SLOT # 1, the S identifier composed of fixed value information and TLV position information whose value is “0xFF” is inserted as the second S identifier from the left. In this example, since the head of a new TLV packet does not exist between the second S identifier and the third S identifier of the slot SLOT # 1, the value of the TLV position information of the second S identifier is “ 0xFF ".

  S identifiers are inserted at fixed-length intervals into data consisting of slots SLOT # 1 to SLOT # 3 in which the data portions from which the slot header is removed are connected. That is, all the distances between adjacent S identifiers have a predetermined fixed length.

  Therefore, for example, the length (data length) between the first and second S identifiers of the slot SLOT # 1 is a predetermined fixed length. Similarly, for example, the length from the third S identifier of the slot SLOT # 1, that is, the last S identifier of the slot SLOT # 1, to the first S identifier of the slot SLOT # 2 is also a predetermined fixed length.

  In the following, a slot is formed by concatenating data portions from which slot headers are removed, and data in which S identifiers are inserted at fixed-length intervals, that is, data output from the synchronization signal insertion unit 35 to the synchronization signal detection unit 36 is It will be referred to as a data string.

  Although the bit rate of the slot data string is different from the bit rate of the original slot, the bit rate changes only between the synchronization signal insertion unit 35 and the synchronization signal detection unit 36. Bit rate changes do not affect the entire system.

  The synchronization signal detector 36 that has received such a slot data string performs packet synchronization by detecting S identifiers inserted in the slot data string at fixed length intervals, and generates a TLV packet.

  For example, the synchronization signal detection unit 36 increments the data counter every time data of a new slot data sequence is fetched from the time when an S identifier as a slot data sequence, more specifically, data that is a candidate for the S identifier is transferred. To go.

  In addition, the synchronization signal detection unit 36 detects whether the next S identifier is detected when the stored data counter reaches a predetermined counter value, that is, when a fixed length of data is captured. Repeat the process to confirm.

  The synchronization signal detection unit 36 is included in the slot data string, that is, the slot data string, when it is confirmed that the S identifier is continuously detected N times or more (where N is an integer) in advance. Assume that TLV packets are synchronized.

  In this case, the length between the S identifiers inserted into the slot data string, that is, the fixed length interval at which the S identifier is inserted is an appropriate interval (length) shorter than the maximum packet length that can be taken by the TLV packet. This makes it possible to synchronize packets faster than when only the fixed bits of the TLV header are used.

  When it is determined that the TLV packet is synchronized, the synchronization signal detection unit 36 removes the S identifier from the fetched slot data sequence, and converts the slot data sequence from which the S identifier has been removed, that is, the slot data into the TLV packet. Transfer to the processing unit 37.

  At this time, the synchronization signal detection unit 36 identifies the leading position of the TLV packet based on the S identifier, and the TLV leading flag indicating the leading position of the TLV packet is also indicated along with the slot data according to the identification result. The packet processing unit 37 is supplied. Since the S identifier describes TLV position information, the head position of the TLV packet can be reliably specified from the slot by referring to the TLV position information.

  Transferring slot data and outputting a TLV head flag in this manner is equivalent to extracting a TLV packet from a slot data string, in other words, generating a TLV packet.

  The supply of the TLV head flag may be performed by a dedicated signal line provided between the synchronization signal detection unit 36 and the TLV packet processing unit 37, for example. Further, for example, a TLV head flag may be inserted into the slot data and supplied to the TLV packet processing unit 37.

  On the other hand, if the next S identifier is not detected when the data counter reaches a predetermined counter value after the S identifier is detected, the TLV packet is not synchronized. In this case, after a new S identifier candidate is detected, the above-described processing is repeated, and when it is confirmed that the S identifier is detected N times continuously, the TLV packet is assumed to be synchronized, The slot data is transferred to the TLV packet processing unit 37.

  As described above, the demodulator 22 inserts an S identifier for packet synchronization into the slot at a fixed length interval to generate a slot data string, and the demultiplexer 23 detects the S identifier from the slot data string, Packet synchronization can be performed at higher speed.

  In addition, by performing packet synchronization using the S identifier, the synchronization signal detection unit 36 reduces the amount of slot data held in the memory until the start position of the TLV packet is determined (specified). Can do. Thereby, the memory saving of the synchronization signal detection unit 36 can be realized.

<Description of reception processing>
Next, the operation of the broadcast receiver 11 shown in FIG. 5 will be described.

  When the broadcast receiver 11 is instructed to receive a broadcast transmission signal, the broadcast receiver 11 performs a reception process to receive the transmission signal and extracts data from the received transmission signal.

  Hereinafter, the reception process by the broadcast receiver 11 will be described with reference to the flowchart of FIG.

  In step S <b> 11, the antenna 21 receives the transmitted transmission signal and supplies it to the demodulation unit 31.

  In step S12, the demodulator 31 demodulates the transmission signal by performing quadrature detection on the transmission signal supplied from the antenna 21, supplies the TMCC signal included in the transmission signal to the deinterleave / error correction unit 33, and This is supplied to the TMCC decoding unit 32.

  In step S <b> 13, the TMCC decoding unit 32 decodes the TMCC signal supplied from the demodulation unit 31 and supplies the TMCC signal to the deinterleave / error correction unit 33.

  In step S14, the deinterleave / error correction unit 33 deinterleaves the transmission signal supplied from the demodulation unit 31 based on the TMCC signal supplied from the TMCC decoding unit 32, and performs error correction processing on the transmission signal. Is supplied to the slot detector 34. For example, in error correction processing, LDCP (Low Density Parity Check) code is decoded.

  In step S15, the slot detection unit 34 supplies the transmission signal composed of the slot supplied from the deinterleave / error correction unit 33 to the synchronization signal insertion unit 35 and detects the leading position of the slot included in the transmission signal. The detection result is also supplied to the synchronization signal insertion unit 35. The method for detecting the beginning of the slot is described in, for example, “” ARIB STD-B44 ”Radio Industry Association”.

  In step S <b> 16, the synchronization signal insertion unit 35 inserts an S identifier into the slot based on the detection result of the head position of the slot supplied from the slot detection unit 34 and the transmission signal including the slot, and the synchronization signal detection unit 36. To supply.

  That is, as described above, the synchronization signal insertion unit 35 deletes the slot header of each slot and inserts the S identifier in the slot, and the slot header is removed from the slot in which the S identifier is inserted. Insert S identifiers by concatenating slots. Thereby, the above-described slot data sequence is generated.

  In step S <b> 17, the synchronization signal detection unit 36 performs packet synchronization of the TLV packet by detecting the S identifier from the slot data sequence supplied from the synchronization signal insertion unit 35, and deletes the S identifier from the slot and deletes the TLV packet. Is supplied to the TLV packet processing unit 37.

  Details of the processing in step S16 and the processing in step S17 will be described later.

  In step S <b> 18, the TLV packet processing unit 37 processes the TLV packet supplied from the synchronization signal detection unit 36. For example, the TLV packet processing unit 37 extracts data such as video data and audio data from the TLV packet and supplies the data to the MMT processing unit 38.

  In step S19, the MMT processing unit 38 performs processing corresponding to the application, such as decoding processing on the data supplied from the TLV packet processing unit 37, as MMT processing, and outputs the obtained data to the subsequent block to receive processing. Ends.

  As described above, the broadcast receiver 11 receives and demodulates the transmission signal, and performs packet synchronization of the TLV packet stored in the slot. In particular, when performing packet synchronization, packet synchronization can be performed at a higher speed by inserting an S identifier into the slot.

<Description of insertion processing>
Next, the process corresponding to step S16 and step S17 in the reception process described with reference to FIG. 7 will be described in more detail.

  First, the insertion process corresponding to the process of step S16 of FIG. 7 will be described with reference to the flowchart of FIG.

  In step S <b> 41, the synchronization signal insertion unit 35 takes in a predetermined amount of slot data constituting the transmission signal from the slot detection unit 34.

  For example, the synchronization signal insertion unit 35 has a fixed-length memory, and stores the data of the fetched slot in the fixed-length memory. Here, the memory area of the memory in which the captured slot data is stored can be an area shorter than the maximum value of the packet length of the TLV packet, that is, an area having a small recording capacity. This is because the synchronization signal insertion unit 35 only inserts the S identifier into the slot data, and therefore, as a memory area for storing the slot data, only the fixed length interval into which the S identifier is inserted. This is because an area should be secured. As described above, in the synchronization signal insertion unit 35, the memory area of the memory for storing the slot data may be an area having a length (size) equal to or less than the maximum value of the packet length of the TLV packet. 35 memory savings can be realized.

  The synchronization signal insertion unit 35 detects the start position of the slot from the fetched data based on the detection result of the start position of the slot supplied from the slot detection unit 34. At this time, the synchronization signal inserting unit 35 detects the head position of the slot by analyzing the data taken in as necessary.

  In step S42, the synchronization signal inserting unit 35 determines whether or not the slot head is detected from the fetched data.

  If it is determined in step S42 that the slot head has not been detected, the process returns to step S41, and the above-described process is repeated. That is, a predetermined amount of slot data is further fetched, and the slot head is detected.

  On the other hand, when it is determined in step S42 that the slot head has been detected, in step S43, the synchronization signal insertion unit 35 analyzes the slot header at the slot head position in the fetched data.

  For example, the synchronization signal insertion unit 35 analyzes the slot header, reads the head TLV instruction information from the slot header, and specifies the start position (head position) of the head TLV packet in the slot fetched from the slot detection unit 34.

  In step S44, the synchronization signal inserting unit 35 deletes the analyzed slot header from the fetched slot data.

  In step S45, the synchronization signal insertion unit 35 detects the leading TLV packet from the data of the fetched slot.

  For example, the synchronization signal insertion unit 35 detects the head TLV packet by detecting “01111111”, which is a fixed bit (fixed value) arranged at the head of the TLV header of the TLV packet, from the data of the fetched slot. At this time, the synchronization signal inserting unit 35 uses the head TLV instruction information indicating the position of the head TLV packet.

  In step S46, the synchronization signal inserting unit 35 determines whether or not the leading TLV packet is detected.

  If it is determined in step S46 that the first TLV packet has not been detected, the process returns to step S45, and the above-described process is repeated. In other words, the synchronization signal insertion unit 35 takes in the slot data from the slot detection unit 34 as necessary, and continuously performs the process of detecting the head TLV packet from the taken-in slot data.

  On the other hand, when it is determined in step S46 that the leading TLV packet has been detected, in step S47, the synchronization signal inserting unit 35 analyzes the TLV header of the detected leading TLV packet. For example, by reading TLV packet length information from the TLV header, the packet length of the leading TLV packet can be specified. Thereby, the head position of the TLV packet arranged next to the head TLV packet can be specified.

  In step S48, the synchronization signal inserting unit 35 inserts the S identifier into the data of the slot from which the slot header has been deleted (removed).

  That is, the synchronization signal insertion unit 35 generates TLV position information based on the head TLV instruction information obtained by the process of step S43 and the packet length of the head TLV packet obtained by the process of step S47. Then, an S identifier composed of fixed value information and TLV position information is generated.

  Then, the synchronization signal insertion unit 35 inserts the generated S identifier at an appropriate position in the data of the slot from which the slot header has been deleted.

  At this time, data from the slot head to the head position of the head TLV packet is deleted as necessary. The S identifier is inserted, for example, at a position separated by a predetermined fixed length from the head position of the data in the slot transferred to the synchronization signal detection unit 36.

  In step S <b> 49, the synchronization signal insertion unit 35 takes in a predetermined amount of slot data constituting the transmission signal from the slot detection unit 34.

  In addition, the synchronization signal insertion unit 35 detects the slot head, that is, the slot header from the acquired slot data based on the detection result of the slot head position supplied from the slot detection unit 34 while acquiring the slot data. .

  At the same time, the synchronization signal insertion unit 35 captures the slot data, based on the packet length of the TLV packet obtained from the analysis result of the TLV header so far, and the beginning position of the TLV packet from the captured slot data. In other words, the TLV header is detected. The head position of the TLV packet can be specified by detecting a fixed bit included in the TLV header.

  In step S50, the synchronization signal inserting unit 35 determines whether or not the slot data has been secured from the position of the last inserted S identifier by a predetermined fixed length, that is, by the fixed length at which the S identifier is inserted. Determine whether.

  For example, after the last S identifier is inserted into the slot data, the slot header and / or TLV header that has not been analyzed yet, while the slot data of a predetermined fixed length is fetched from the position of the S identifier. Is detected, it is determined that the slot data has not been secured for a fixed length.

  Conversely, even if slot headers and TLV headers are detected while fetching slot data for a fixed length from the S identifier inserted last in the slot data, if the analysis of those headers is completed, they will be fixed. It is determined that the slot data has been secured for a fixed length when the long slot data is taken in.

  If it is determined in step S50 that slot data has been secured by a fixed length, in step S51, the synchronization signal insertion unit 35 inserts an S identifier into the secured slot data.

  That is, the synchronization signal insertion unit 35 determines the position of the last inserted S identifier, the head TLV instruction information obtained by analyzing the slot header, and the packet length of the TLV packet obtained by analyzing the TLV header. By generating TLV position information based on this, an S identifier composed of fixed value information and TLV position information is generated.

  Then, the synchronization signal insertion unit 35 inserts the newly generated S identifier at a position that is a predetermined fixed length away from the last inserted S identifier in the reserved slot data. To do.

  When the slot data sequence is generated in this way, the synchronization signal insertion unit 35 supplies the generated slot data sequence to the synchronization signal detection unit 36 by a predetermined amount. That is, the synchronization signal insertion unit 35 reads and outputs the slot data string by a predetermined amount from the memory area of the fixed-length memory in the synchronization signal insertion unit 35 in which the slot data string is stored.

  When the S identifier is inserted and the slot data string is generated, the process returns to step S49, and the above-described process is repeated.

  If it is determined in step S50 that slot data has not been secured for a fixed length, in step S52, the synchronization signal insertion unit 35 determines whether a TLV header has been detected.

  When it is determined in step S52 that a TLV header has been detected, in step S53, the synchronization signal insertion unit 35 analyzes the TLV header detected from the data of the fetched slot.

  That is, the synchronization signal insertion unit 35 reads the TLV packet length information from the detected TLV header and specifies the packet length of the TLV packet. Thereby, in the slot data, the head position of the TLV packet arranged next to the TLV packet including the detected TLV header can be specified.

  When the TLV header is analyzed in step S53, the process proceeds to step S54.

  If it is determined in step S52 that no TLV header has been detected, the process in step S53 is skipped, and the process proceeds to step S54.

  If it is determined in step S53 that the TLV header has been analyzed or no TLV header has been detected in step S52, the synchronization signal insertion unit 35 determines in step S54 whether a slot header has been detected. For example, the slot header is detected based on the detection result of the head position of the slot supplied from the slot detector 34 as described above.

  When it is determined in step S54 that the slot header has been detected, in step S55, the synchronization signal insertion unit 35 analyzes the slot header detected from the data of the fetched slot. That is, the synchronization signal insertion unit 35 reads the head TLV instruction information from the detected slot header, thereby specifying the position of the head TLV packet in the data of the fetched slot.

  In step S56, the synchronization signal insertion unit 35 deletes (removes) the slot header analyzed in the process of step S55 from the fetched slot data.

  As a result, in the synchronization signal inserting unit 35, the data of the consecutively arranged slots are connected in a state where the slot header of each slot is removed. In other words, only the data portions (payloads) of consecutively arranged slots are connected.

  When the slot header is deleted from the slot, the process returns to step S49, and the above-described process is repeated.

  If it is determined in step S54 that no slot header has been detected, the process returns to step S49, and the above-described process is repeated.

  Then, when all the transmission signals received by the broadcast receiver 11 are processed, the insertion process ends.

  As described above, the synchronization signal insertion unit 35 inserts S identifiers at predetermined fixed length intervals into the slot data.

  As a result, the synchronization signal detector 36 at the subsequent stage can detect the S identifier and perform packet synchronization of the TLV packet at a higher speed.

  In particular, if the fixed-length interval in which the S identifier is inserted is shorter than the maximum packet length that can be taken by a TLV packet that is a variable-length packet, rather than performing packet synchronization using only the TLV header. , TLV packets can be synchronized faster. In addition, since the head position of each TLV packet can be specified from information related to the TLV packet described in the S identifier, that is, TLV position information, the TLV packet can be easily generated.

<Description of synchronization processing>
Furthermore, the synchronization process corresponding to the process of step S17 of FIG. 7 will be described with reference to the flowchart of FIG.

  In step S <b> 81, the synchronization signal detection unit 36 takes in a slot data string from the synchronization signal insertion unit 35 by a predetermined amount. For example, the fetched slot data string is temporarily stored in a fixed-length memory provided in the synchronization signal detection unit 36.

  Further, when the slot signal sequence is fetched, the synchronization signal detector 36 starts the process of detecting the S identifier by detecting fixed value information constituting the S identifier from the fetched slot data sequence.

  In step S82, the synchronization signal detector 36 determines whether or not an S identifier has been detected.

  If it is determined in step S82 that the S identifier has not been detected, the process returns to step S81, and the above-described process is repeated. That is, a slot data string is further fetched by a predetermined amount, and the S identifier is detected.

  On the other hand, when it is determined in step S82 that the S identifier has been detected, in step S83, the synchronization signal detection unit 36 determines whether or not the interval between the detected S identifiers is a fixed length interval. That is, it is determined whether or not S identifiers are detected from the slot data string at fixed length intervals.

  For example, the length between the S identifier detected from the slot data string in step S82 and the S identifier detected immediately before the S identifier is a predetermined fixed length into which the S identifier is inserted. If there is, it is determined that the interval is a fixed length.

  If it is determined in step S83 that the interval is not a fixed length, since the S identifier is not detected at the correct interval, the detection result of the S identifier is assumed to be false detection. And a process returns to step S81 and the process mentioned above is performed repeatedly.

  On the other hand, when it is determined in step S83 that the interval is a fixed length, in step S84, the synchronization signal detector 36 continues the S identifier for N times (where N is an integer). It is determined whether it is detected correctly. For example, if it is determined that the fixed length interval is N times consecutively in step S83, it is determined that the S identifier has been detected N times.

  If it is determined in step S84 that the S identifier has not been detected N times, since the TLV packet has not been synchronized yet, the process returns to step S81 and the above-described process is repeated.

  On the other hand, if it is determined in step S84 that the S identifier has been detected N times, it is determined that the TLV packet has been synchronized, and the process proceeds to step S85.

  For example, when S identifiers are detected N times consecutively from the slot data string, it is confirmed that (N + 1) S identifiers are arranged at fixed length intervals in the slot data string. The S identifier describes TLV position information indicating the start position of the TLV packet stored in the slot data string.

  Accordingly, in such a state, the synchronization signal detection unit 36 can correctly capture the head position of each TLV packet in the slot data string, and therefore, the TLV packet is in a synchronized state. The

  In step S85, the synchronization signal detecting unit 36 deletes the S identifier detected so far from the slot data string temporarily held.

  In step S86, the synchronization signal detection unit 36 generates a TLV head flag indicating the head position of the TLV packet in the slot data string (slot data) based on the TLV position information of the S identifier deleted in step S85.

  If there is a head of a TLV packet between the S identifier and the next S identifier in the slot data string, the distance (length) from the S identifier to the head of the TLV packet is the number of bytes in the S identifier. It is described in. Therefore, it is possible to specify the head position of each TLV packet from the S identifier.

  Note that if all the TLV position information of the S identifier deleted in step S85 is a predetermined value such as “0xFF” and there is no TLV packet head between these S identifiers, no TLV head flag is generated.

  Further, when generating the TLV head flag, the synchronization signal detection unit 36 detects the fixed bit in the TLV header from the position where the TLV packet head of the slot data should be, if necessary, so that the synchronization of the TLV packet is correctly performed. You may make it confirm that it is removed.

  In step S <b> 87, the synchronization signal detection unit 36 transfers the temporarily held slot data to the TLV packet processing unit 37. Therefore, here, the data of the slot is transferred to the TLV packet processing unit 37 with the S identifier removed. At this time, when the TLV head flag is generated in step S86, the synchronization signal detection unit 36 supplies the TLV head flag to the TLV packet processing unit 37 together with the slot data at an appropriate timing.

  In this way, transferring the TLV head flag together with the slot data to the TLV packet processing unit 37 means that the synchronization signal detecting unit 36 extracts the data of each TLV packet portion from the slot data sequence and generates a TLV packet. It can also be said that.

  As described above, the TLV head flag supplying method can be any method as long as the TLV packet processing unit 37 knows which position of the transferred slot data is the head position of the TLV packet. It may be a supply method.

  In step S <b> 88, the synchronization signal detection unit 36 takes in a slot data string from the synchronization signal insertion unit 35 by a predetermined amount. For example, the fetched slot data string is temporarily stored in a fixed-length memory provided in the synchronization signal detection unit 36. Further, when the slot signal sequence is fetched, the synchronization signal detector 36 detects the S identifier by detecting fixed value information constituting the S identifier from the fetched slot data sequence.

  In step S89, the synchronization signal detector 36 determines whether or not an S identifier is detected.

  If it is determined in step S89 that no S identifier has been detected, the process returns to step S88, and the above-described process is repeated.

  On the other hand, when it is determined in step S89 that the S identifier is detected, in step S90, the synchronization signal detection unit 36 determines whether or not the interval between the detected S identifiers is a fixed length interval.

  That is, in step S90, it is determined whether or not the interval between the S identifier detected in step S89 and the S identifier detected immediately before the S identifier is a predetermined fixed length interval. .

  If it is determined in step S90 that the interval between the S identifiers is not a fixed length interval, the TLV packet is not synchronized. Therefore, the process returns to step S81, and the above-described process is repeated. That is, the process of synchronizing the TLV packet is performed again.

  On the other hand, if it is determined in step S90 that the interval between the S identifiers is a fixed length interval, the TLV packet is continuously synchronized, and the process proceeds to step S91.

  In step S91, the synchronization signal detection unit 36 deletes the S identifier detected in the process of step S89 from the slot data string temporarily held.

  In step S92, the synchronization signal detector 36 generates a TLV head flag based on the TLV position information of the S identifier deleted in step S91.

  That is, in step S92, a TLV head flag is generated in the same manner as in step S86. Even in this case, if the TLV position information of the S identifier is a predetermined value such as “0xFF” and the head of the TLV packet does not exist, the TLV head flag is not generated.

  Further, when generating the TLV head flag, the synchronization signal detection unit 36 detects the fixed bit in the TLV header from the position where the TLV packet head of the slot data should be, if necessary, so that the synchronization of the TLV packet is correctly performed. You may make it confirm that it is removed.

  In step S <b> 93, the synchronization signal detection unit 36 reads the slot data temporarily held in the fixed-length memory and transfers it to the TLV packet processing unit 37. At this time, if the TLV head flag is generated in step S92, the synchronization signal detection unit 36 supplies the TLV head flag together with the slot data to the TLV packet processing unit 37 at an appropriate timing.

  In the processing from step S88 to step S93, the slot data can be transferred every fixed length interval in which the S identifier is inserted. Therefore, compared to the case where packet synchronization is performed using only the TLV header, the amount of data in the slot data sequence held by the synchronization signal detection unit 36 can be reduced, resulting in a reduction in memory. can do.

  That is, in this case, the memory area of the fixed-length memory that stores the slot data string in the synchronization signal detection unit 36 is set to an area shorter than the maximum value of the packet length of the TLV packet, that is, an area having a small recording capacity. Therefore, the memory saving in the synchronization signal detection unit 36 can be realized.

  When the slot data is transferred in this way, the process thereafter returns to step S88, and the above-described process is repeated. Then, when all the transmission signals received by the broadcast receiver 11 are processed, the synchronization process ends.

  As described above, the synchronization signal detection unit 36 performs packet synchronization of the TLV packet by detecting the S identifier from the slot data sequence, and when the TLV packet is synchronized, deletes the S identifier from the slot data sequence. Then, the data is transferred to the TLV packet processing unit 37.

  In addition, the synchronization signal detection unit 36 identifies the start position of the TLV packet from the TLV position information described in the S identifier, generates a TLV start flag, and supplies the TLV packet processing unit 37 to the TLV packet processing unit 37.

  By detecting the S identifier and synchronizing the TLV packet in this manner, packet synchronization can be performed at a higher speed. Further, by performing packet synchronization using the S identifier, it is possible to realize memory saving of the synchronization signal detection unit 36.

  By the way, the above-described series of processing can be executed by hardware or can be executed by software. When a series of processing is executed by software, a program constituting the software is installed in the computer. Here, the computer includes, for example, a general-purpose personal computer capable of executing various functions by installing a computer incorporated in dedicated hardware and various programs.

  FIG. 10 is a block diagram illustrating an example of a hardware configuration of a computer that executes the above-described series of processes using a program.

  In a computer, a CPU (Central Processing Unit) 501, a ROM (Read Only Memory) 502, and a RAM (Random Access Memory) 503 are connected to each other by a bus 504.

  An input / output interface 505 is further connected to the bus 504. An input unit 506, an output unit 507, a recording unit 508, a communication unit 509, and a drive 510 are connected to the input / output interface 505.

  The input unit 506 includes a keyboard, a mouse, a microphone, an antenna, and the like. The output unit 507 includes a display, a speaker, and the like. The recording unit 508 includes a hard disk, a nonvolatile memory, and the like. The communication unit 509 includes a network interface or the like. The drive 510 drives a removable recording medium 511 such as a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory.

  In the computer configured as described above, the CPU 501 loads the program recorded in the recording unit 508 to the RAM 503 via the input / output interface 505 and the bus 504 and executes the program, for example. Is performed.

  The program executed by the computer (CPU 501) can be provided by being recorded in a removable recording medium 511 as a package medium or the like, for example. The program can be provided via a wired or wireless transmission medium such as a local area network, the Internet, or digital satellite broadcasting.

  In the computer, the program can be installed in the recording unit 508 via the input / output interface 505 by attaching the removable recording medium 511 to the drive 510. Further, the program can be received by the communication unit 509 via a wired or wireless transmission medium and installed in the recording unit 508. In addition, the program can be installed in the ROM 502 or the recording unit 508 in advance.

  The program executed by the computer may be a program that is processed in time series in the order described in this specification, or in parallel or at a necessary timing such as when a call is made. It may be a program for processing.

  The embodiments of the present technology are not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present technology.

  For example, the present technology can take a configuration of cloud computing in which one function is shared by a plurality of devices via a network and is jointly processed.

  In addition, each step described in the above flowchart can be executed by being shared by a plurality of apparatuses in addition to being executed by one apparatus.

  Further, when a plurality of processes are included in one step, the plurality of processes included in the one step can be executed by being shared by a plurality of apparatuses in addition to being executed by one apparatus.

  Furthermore, this technique can also be set as the following structures.

(1)
A synchronization signal insertion unit that generates a slot data string by inserting a synchronization signal used for packet synchronization at fixed-length intervals into a slot in which a packet is stored;
A broadcast receiver comprising: a synchronization signal detecting unit configured to detect packet synchronization of the packet by detecting the synchronization signal from the slot data string.
(2)
The broadcast receiver according to (1), wherein the synchronization signal includes fixed value information that is a predetermined value and packet position information regarding the position of the packet in the slot data string.
(3)
The broadcast receiver according to (2), wherein the packet position information is information indicating a head position of the packet between the synchronization signals.
(4)
The broadcast receiver according to (2) or (3), wherein the synchronization signal insertion unit generates the packet position information based on an analysis result of a slot header included in the slot.
(5)
The synchronization signal insertion unit deletes a slot header included in the slot, and generates the slot data string by inserting the synchronization signal into the slot (1) to (4). Broadcast receiver described in 1.
(6)
The broadcast receiver according to any one of (1) to (5), wherein the fixed-length interval is shorter than a maximum packet length that the packet can take.
(7)
The broadcast receiver according to any one of (1) to (6), wherein the packet is a variable-length packet.
(8)
The broadcast receiver according to (7), wherein the packet is a TLV packet.
(9)
The broadcast receiver according to any one of (1) to (8), wherein the synchronization signal detection unit generates the packet by deleting the synchronization signal from the slot data string.
(10)
The synchronization signal insertion unit stores the slot in a memory area shorter than the length of the packet, and inserts the synchronization signal into the slot stored in the memory area. A broadcast receiver according to claim 1.
(11)
The synchronization signal detection unit stores the slot data string in a memory area shorter than the length of the packet, and detects the synchronization signal from the slot data string stored in the memory area. (1) to (10) The broadcast receiver according to any one of the above.
(12)
A slot data string is generated by inserting a synchronization signal used for packet synchronization at a fixed length interval into a slot in which a packet is stored,
A receiving method including a step of performing packet synchronization of the packet by detecting the synchronization signal from the slot data string.
(13)
A slot data string is generated by inserting a synchronization signal used for packet synchronization at a fixed length interval into a slot in which a packet is stored,
A program that causes a computer to execute processing including a step of performing packet synchronization of the packet by detecting the synchronization signal from the slot data string.

  11 broadcast receiver, 22 demodulator, 23 demultiplexer, 34 slot detector, 35 sync signal inserter, 36 sync signal detector, 37 TLV packet processor

Claims (13)

A synchronization signal insertion unit that generates a slot data string by inserting a synchronization signal used for packet synchronization at fixed-length intervals into a slot in which a packet is stored;
A broadcast receiver comprising: a synchronization signal detecting unit configured to detect packet synchronization of the packet by detecting the synchronization signal from the slot data string. The broadcast receiver according to claim 1, wherein the synchronization signal includes fixed value information that is a predetermined value and packet position information regarding the position of the packet in the slot data string. The broadcast receiver according to claim 2, wherein the packet position information is information indicating a head position of the packet between the synchronization signals. The broadcast receiver according to claim 2, wherein the synchronization signal insertion unit generates the packet position information based on an analysis result of a slot header included in the slot. The broadcast receiver according to claim 1, wherein the synchronization signal insertion unit deletes a slot header included in the slot, and inserts the synchronization signal into the slot to generate the slot data string. The broadcast receiver according to claim 1, wherein the fixed length interval is shorter than a maximum packet length that the packet can take. The broadcast receiver according to claim 1, wherein the packet is a variable-length packet. The broadcast receiver according to claim 7, wherein the packet is a TLV packet. The broadcast receiver according to claim 1, wherein the synchronization signal detection unit generates the packet by deleting the synchronization signal from the slot data string. The broadcast receiver according to claim 1, wherein the synchronization signal insertion unit stores the slot in a memory area shorter than the length of the packet, and inserts the synchronization signal into the slot stored in the memory area. . The broadcast according to claim 1, wherein the synchronization signal detection unit stores the slot data string in a memory area shorter than the length of the packet, and detects the synchronization signal from the slot data string stored in the memory area. Receiving machine. A slot data string is generated by inserting a synchronization signal used for packet synchronization at a fixed length interval into a slot in which a packet is stored,
A receiving method including a step of performing packet synchronization of the packet by detecting the synchronization signal from the slot data string. A slot data string is generated by inserting a synchronization signal used for packet synchronization at a fixed length interval into a slot in which a packet is stored,
A program that causes a computer to execute processing including a step of performing packet synchronization of the packet by detecting the synchronization signal from the slot data string.

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