KR20210023853A - Receiving device, and receiving method - Google Patents

Abstract

The present technology relates to a receiving apparatus and a receiving method capable of reducing jitter in processing a stream. When a divided variable length packet obtained by dividing a variable length packet is included as a transport stream transmitted for each of a plurality of carriers, data of the payload unit of the header unit and the payload unit constituting the divided variable length packet are sequentially stored in the memory. At the time of recording, there is provided a receiving apparatus including a control unit that controls a clock for reading data recorded in the memory based on the amount of data recorded in the period of the predetermined frame and the time of the period of the predetermined frame. The present technology can be applied, for example, to a receiver corresponding to digital cable television broadcasting.

Description

Receiving device, and receiving method

BACKGROUND OF THE INVENTION 1. Field of the Invention The present technology relates to a reception device and a reception method, and in particular, to a reception device capable of reducing jitter in processing a stream, and a reception method.

In order to transmit a large-capacity signal that cannot be transmitted through one channel, a multi-carrier transmission method, which is a method of transmitting a large-capacity signal by dividing a large-capacity signal by extending the existing transmission method, is known (e.g., Patent Document 1).

Patent Document 1: International Publication No. 2016/117283

By the way, in a reception apparatus corresponding to the multi-carrier transmission method, streams for each of a plurality of carriers are synthesized and output, but it is required to reduce jitter in processing the stream.

The present technology has been made in consideration of such a situation, and it is possible to reduce jitter when processing a stream.

The receiving apparatus of one aspect of the present technology includes a header portion and a payload portion constituting the divided variable length packet when a divided variable length packet obtained by dividing a variable length packet is included as a transport stream transmitted for each of a plurality of carriers. In the case of sequentially writing the data of the payload unit to the memory, based on the amount of data recorded in the section of the predetermined frame and the time of the section of the predetermined frame, for reading the data recorded in the memory It is a reception device including a control unit that controls a clock.

The receiving method according to one aspect of the present technology is a header unit constituting the divided variable-length packet when the receiving device includes a divided variable-length packet obtained by dividing a variable-length packet as a transport stream transmitted for each of a plurality of carriers. And the payload unit, when sequentially recording data of the payload unit into the memory, the data recorded in the memory based on the amount of data recorded in the period of the predetermined frame and the time of the period of the predetermined frame. It is a receiving method that controls the clock for reading the s.

In the receiving apparatus and receiving method of one aspect of the present technology, when a divided variable-length packet obtained by dividing a variable-length packet is included as a transport stream transmitted for each of a plurality of carriers, a header part constituting the divided variable-length packet And the payload unit, when sequentially recording data of the payload unit into the memory, the data recorded in the memory based on the amount of data recorded in the period of the predetermined frame and the time of the period of the predetermined frame. The clock for reading is controlled.

The receiving device according to one aspect of the present technology may be an independent device or may be an internal block constituting one device.

According to one aspect of the present technology, jitter in processing a stream can be reduced.

In addition, the effect described herein is not necessarily limited, and any one of the effects described in the present disclosure may be used.

1 is a diagram showing a configuration of an embodiment of a transmission system to which the present technology is applied.
Fig. 2 is a diagram showing an example of a configuration of a multi-frame.
Fig. 3 is a diagram showing an outline of the syntax of a multi-frame header.
4 is a diagram showing an example of a configuration of a TLV packet and a divided TLV packet.
5 is a diagram showing an example of a configuration of a header portion and a payload portion of a divided TLV packet.
6 is a diagram showing an example of a configuration of a superframe.
Fig. 7 is a block diagram showing an example of a configuration of a demodulation IC of a receiving device having a function in the current state.
Fig. 8 is a diagram schematically showing the principle of including jitter when processing a stream as a function of the current state.
Fig. 9 is a diagram schematically showing a delay between carriers.
Fig. 10 is a block diagram showing an example of the configuration of a reception device having a new function.
Fig. 11 is a diagram showing the operation of each part in the demodulation IC corresponding to the header removal and smoothing function and the flow of the signal.
Fig. 12 is a flow chart for explaining the flow of carrier correspondence processing.
13 is a flowchart for explaining details of TLV conversion processing.
Fig. 14 is a flow chart for explaining the flow of data readout clock control processing.
Fig. 15 is a diagram showing an example of setting the data read start timing by the delay correspondence function.
Fig. 16 is a flow chart for explaining the flow of data reading start timing control processing.
Fig. 17 is a block diagram showing an example of another configuration of a demodulation IC corresponding to a delay correspondence function.
18 is a diagram showing a configuration example of a computer.

Hereinafter, embodiments of the present technology will be described with reference to the drawings. In addition, explanation is made by performing the following procedure.

1. Embodiments of the present technology

2. Modification

3. Computer configuration

<1. Embodiment of the present technology>

(Configuration example of transmission system)

1 is a diagram showing a configuration of an embodiment of a transmission system to which the present technology is applied. In addition, a system refers to a logical aggregation of a plurality of devices.

In Fig. 1, the transmission system 1 is a system corresponding to a broadcasting system of digital cable television broadcasting such as ISDB-C (Integrated Services Digital Broadcasting for Cable).

In this digital cable television broadcasting (cable television), a multi-carrier transmission method is adopted, and the transmission side transmits a stream exceeding the transmission capacity of one carrier using a plurality of carriers. The dividedly transmitted stream is synthesized. In the multi-carrier transmission method, for each of the plurality of carriers, for example, a modulation method such as 64QAM (Quadrature Amplitude Modulation) or 256QAM is used.

The transmission system 1 is composed of a transmission device 10, a reception device 20, and a CATV transmission path 30. In addition, in Fig. 1, one reception device 20 is shown in order to simplify the explanation, but in reality, a reception device 20 is provided for each subscriber's home of a cable TV.

The transmission device 10 is a head end provided in a cable television broadcasting station.

The transmission device 10 receives a broadcast signal of terrestrial broadcasting or satellite broadcasting, processes a stream of contents such as the program, and transmits (retransmits) to the reception device 20 through the CATV transmission path 30. In addition to retransmission, the transmission device 10 transmits, for example, a stream of content such as a broadcast program independently produced by a cable television broadcasting station or a broadcast program received through a communication line such as the Internet, and transmits the CATV. It may be transmitted to the receiving device 20 through the furnace 30.

The CATV transmission path 30 is composed of, for example, a transmission medium such as a coaxial cable or an optical fiber, and connects the head end of a cable television broadcasting station and a subscriber's home of the cable television by wire.

The reception device 20 is, for example, a fixed receiver such as a television receiver installed in a subscriber's home of a cable television or a set top box (STB).

The reception device 20 receives a broadcast signal transmitted from the transmission device 10 through the CATV transmission path 30 and processes a stream of content, thereby displaying an image such as the broadcast program on the display, Outputs audio synchronized with the video from the speaker. Thereby, subscribers of cable television can view content such as broadcast programs.

Here, as the stream processed by the reception device 20 (reception system of), for example, a single transport stream (single TS) conforming to the single TS multiplexing method, and a plurality of transport streams conforming to the multiple TS multiplexing method ( A plurality of TS), and a transport stream conforming to the multi-carrier transmission method.

A single TS is used for normal broadcasting, for example. On the other hand, a transport stream of a plurality of TSs and a multi-carrier transmission system is used when, for example, satellite broadcast content is retransmitted by cable television.

In addition, as satellite broadcasting (BS broadcasting), operation of advanced broadband satellite digital broadcasting (high-level BS broadcasting) is started. For example, multiple TSs are used for retransmission of normal BS broadcasting, while a multi-carrier transmission method is used. The transport stream can be used for retransmission of advanced BS broadcasting that provides a 4K·8K ultra-high-precision television broadcasting service.

(Composition of multiple frames)

2 is a diagram showing an example of a configuration of a multi-frame.

In FIG. 2, multiple frames such as a plurality of TSs are 53 slots in total, with one slot assigned to a multi-frame header and 52 slots assigned to data of each broadcast program such as broadcast program A, broadcast program B, and broadcast program C. 1 frame is composed of. This multiple frame is called TSMF (Transport Streams Multiplexing Frame), and the multiple frame header is called TSMF header. Further, each broadcast program such as broadcast program A, broadcast program B, or broadcast program C becomes a broadcast program of a channel of another broadcaster.

(Overview of TSMF header)

3 is a diagram showing an outline of the syntax of a multi-frame header (TSMF header).

The TSMF header, as header information, includes fields of packet header, frame_sync, version_number, relative_stream_number_mode, frame_type, stream_status, stream_id/original_network_id, receive_status, reserved_for_future_use, emergency_indicator, relative_stream_number, extension information, and CRC. The parameters of the header information are designated by these fields.

The packet header includes a sync byte, frame_PID, and a continuity index. frame_sync is a field of a TSMF synchronization signal. The version_number is a field for indicating change of the TSMF header.

The relative_stream_number_mode is a field for distinguishing a slot arrangement method. frame_type is a field for distinguishing the format of TSMF. stream_status is a field for indicating validity or invalidity of a corresponding stream number.

stream_id/original_network_id is a field for identifier/relative stream number correspondence information. In addition, hereinafter, stream_id is also referred to as a stream identifier, and original_network_id is also referred to as a network identifier. In addition, the stream identifier (stream_id) and the network identifier (original_network_id) are collectively referred to as identification information.

receive_status is a field indicating received information to the head end. reserved_for_future_use is a field (undefined) for future expansion. emergency_indicator is a field for indicating an emergency alert. The relative_stream_number is a field for information about a relative stream number versus slot correspondence.

When the header information of the TSMF header is extended, the extended information is arranged by expanding the area using private_data. The CRC is a field of a CRC (Cyclic Redundancy Check) value for error detection.

Here, in the extended information, information for synthesis is defined, for example. The extension information includes fields of earthquake_early_warning, stream_type, group_id, number_of_carriers, carrier_sequence, number_of_frames, frame_position, and field_for_extension.

earthquake_early_warning is a field for earthquake motion warning information of terrestrial digital broadcasting.

stream_type is a field for indicating stream type. As the stream_type, "TS" or "TLV" is designated. That is, "TS" is specified for a transport stream (TS) including TS packets, and "TLV" is specified for a transport stream (TLV) including TLV packets (divided TLV packets).

In addition, hereinafter, stream_type is also referred to as type information. In addition, since the TS packet is a packet of a fixed length (for example, 188 bytes), it is also referred to as a fixed length packet. On the other hand, since the TLV packet is a variable length packet, it is also referred to as a variable length packet.

group_id is a field for identifying a carrier group. number_of_carriers is a field for indicating the total number of carriers constituting the carrier group. carrier_sequence is a field for indicating the order of synthesis of the demodulation output of the carrier.

number_of_frames is a field for indicating the number of frames included in a superframe. frame_position is a field for frame position information. field_for_extension is a field (undefined) for future extension.

(Composition of TLV and Split TLV)

4 is a diagram showing an example of a configuration of a TLV packet and a divided TLV packet.

Here, in the broadcasting system of digital cable television broadcasting (for example, ISDB-C, etc.), the demodulated and output is a TS format signal (TS signal), whereas in a broadcasting system such as advanced BS broadcasting, TLV ( Type Length Value) type signal (TLV signal). Therefore, in order to carry (transmit) a TLV signal in a broadcasting system such as advanced BS broadcasting by a broadcasting system such as ISDB-C, it is necessary to convert it into a TS format signal.

That is, the TLV packet is divided and, as the divided TLV packet, a variable TLV vector is converted into a fixed length format of 188 bytes. In addition, the TS packet is 188 bytes, and the multiple frame (TSMF) slot is also composed of 188 bytes of the same size as the TS packet.

Specifically, in FIG. 4, for example, when the TLV packet P1 and the TLV packet P2 are consecutive, the TLV packet P1 is divided into three by 185 bytes, and the divided TLV packet DP1, It is stored in the payload part of DP2, DP3), respectively. In the divided TLV packet (DP), the payload portion becomes 185 bytes, and a 3-byte divided TLV packet header is added. In other words, the divided TLV packet is 3 bytes in the header part and 185 bytes in the payload part, which is a total of 188 bytes.

In the example of FIG. 4, a part of the TLV packet P1 (a signal of an 185 byte part) is sequentially stored in the payload part of the divided TLV packets DP1 and DP2, and the remaining part (signal of less than 185 bytes) is stored. ) Is stored in the payload portion of the divided TLV packet DP3. That is, in the payload part of the divided TLV packet DP3, the remaining part of the TLV packet P1 (signal of less than 185 bytes) and a part of the TLV packet P2 following it (signal of less than 185 bytes) are stored. And 185 bytes in total.

In addition, FIG. 5 shows an example of the configuration of a header portion and a payload portion of a divided TLV packet. In a divided TLV packet, a 3-byte divided TLV packet header includes a sync byte, a transport error indicator, a TLV packet start indicator, and a PID.

The synchronization byte becomes "0x47". As the transport error indicator, a flag indicating the presence or absence of a bit error in the divided TLV packet is designated.

A flag indicating whether the head of the TLV packet is included in the TLV packet start indicator and the payload portion of the divided TLV packet is designated. For example, in a divided TLV packet, when the TLV packet start indicator of the divided TLV packet header is "1", it indicates that the head of the TLV packet is included in the payload part.

Further, when this TLV packet start indicator becomes "1", as shown in Fig. 5A, a head TLV instruction is set in the head 1 byte of the payload portion. For example, a value obtained by adding 1 to the value of the first TLV indication indicates the number of bytes up to the start position of the first TLV packet in the payload of the divided TLV packet following the first TLV indication. In addition, when the TLV packet start indicator becomes "0", as shown in FIG. 5B, the head TLV indication is not inserted.

As described above, when the TLV packet start indicator of the split TLV packet header becomes "1", the head of the TLV packet is included in the payload part of the split TLV packet, and the first TLV indication of 1 byte is inserted therein. The stored data is 184 bytes (Fig. 5A). On the other hand, when the TLV packet start indicator of the divided TLV packet header becomes "0", the head of the TLV packet is not included in the payload part of the divided TLV packet, and the head TLV indication is not inserted, so that it is stored there. The resulting data becomes 185 bytes (FIG. 5B).

The PID is used to identify that the data of the payload portion is TLV data. The value is determined as "0x002D".

In the multi-carrier transmission method, synthesis is performed using a format using multiple frames (TSMF header) as shown in Fig. 2 and a divided TLV packet shown in Fig. 4. At that time, by adding a TSMF header (FIG. 3) to a TLV signal (TLV stream) formed into a divided TLV packet, it becomes possible to process as a transport stream having a multi-frame configuration.

In addition, in the multi-carrier transmission method, a superframe is defined as a frame composed of a plurality of multiple frames (TSMF). Here, in the multi-carrier transmission method, when, for example, a modulation method of 64QAM and 256QAM is used, the transmission rate is 31.644 Mbps for 64QAM and 42.192 Mbps for 256QAM, and 64QAM and 256QAM have a 3:4 relationship. .

From this relationship, as shown in Fig. 6, in a 64QAM carrier, 53 slots of a multi-frame are set to 3 sets and 1 superframe, while in a carrier of 256QAM, 53 slots of a multi-frame are set to 4 sets, 1 Make it a super frame. In addition, as shown in Fig. 6, as a subframe, for a 64QAM carrier, three slots are used as one subframe, while for a 256QAM carrier, four slots are used as one subframe.

In addition, in the reception device 20, the synthesis is performed in units of subframes, and sequentially synthesized from those with a small number of the carrier order ("after synthesis" in Fig. 6). However, only the 4th time of the 1st subframe is synthesized with only 256QAM carriers.

(Example of the function of the current state)

Here, for comparison with a new function to which the present technology is applied, the configuration and operation of the reception device 20 (the demodulation IC 902) having the current function will be described with reference to FIGS. 7 to 9.

7 is a block diagram showing an example of the configuration of the demodulation IC 902 of the reception device 20 having the function of the current state.

In FIG. 7, the demodulation IC 902 of the reception device 20 having a function as the current state includes a control unit 910, TSMF processing units 911-1 to 911-4, a synthesis unit 912, a memory 913, and A TLV conversion unit 914 and a memory 915 are included.

The control unit 910 controls the operation of each part of the demodulation IC 902.

The TSMF processing units 911-1 to 911-4 perform TSMF processing on the transport stream from the internal demodulation unit or the external demodulation IC, and supply the target transport streams to the synthesis unit 912, respectively. Further, the TSMF processing units 911-1 to 911-4 supply the header information of the TSMF header to the control unit 910.

The synthesizing unit 912 performs synthesizing processing for synthesizing the transport streams from the TSMF processing units 911-1 to 911-4, and records the resultant data in the memory 913.

The TLV conversion unit 914 reads data from the memory 913, performs TLV conversion processing, and writes the data obtained as a result to the memory 915. The data recorded in the memory 915 is read and output to a processing unit (for example, a system-on-chip) at a later stage.

(Jitter's problem)

Here, FIG. 8 schematically shows the principle of including jitter when processing a stream as a function of the current state.

In addition, the symbols "A" to "E" attached to each data (signal) in Fig. 8 are attached to an arrow indicating the flow of data (signal) in the demodulation IC 902 of Fig. 7 described above. They correspond to the symbols of A" to "E", and in the description of Fig. 8, these data (signals) and the flow are described in association with each other.

Fig. 8A shows a signal of a 64QAM carrier wave, and this transport stream is input to the TSMF processing unit 911-1 (arrow A in Fig. 7). Further, Fig. 8B shows a signal of a 64QAM carrier wave, and this transport stream is input to the TSMF processing unit 911-2 (arrow B in Fig. 7). These transport streams contain divided TLV packets.

Transport streams input to the TSMF processing unit 911-1 and TSMF processing unit 911-2, respectively, are synthesized by the synthesis unit 912 and recorded in the memory 913 (S1). Then, the data recorded in the memory 913 is read by the TLV conversion unit 914. At that time, the data is read in accordance with a predetermined clock, whereby smoothing is realized (S1). Here, smoothing is a function of reading data recorded in the memory at a constant rate and continuously outputting it.

Fig. 8C shows data DATA read out from the memory 913, and this divided TLV packet (data of) is input to the TLV conversion unit 914 (arrow C in Fig. 7). Then, the VALID signal of the data (DATA) in the header portion of the divided TLV packet is at a low level, and the header portion is invalid (S2).

8D shows data DATA output from the TLV conversion unit 914, and a two-division TLV packet (data of a divided TLV packet in which the header portion is invalid) is recorded in the memory 915 (Fig. Arrow at 7 D).

Then, the data recorded in the memory 915 is read and output to a processing unit (e.g., system-on-chip) at a later stage. At that time, smoothing is realized by reading the data in response to a predetermined clock ( S3). 8E shows data DATA read out from the memory 915 (arrow E in FIG. 7).

In this way, if the divided TLV packets are synthesized and smoothed by the current function, smoothing needs to be performed again when TLV conversion is performed. Specifically, in the example of Fig. 8, two smoothing is performed with "synthesis & smoothing" of S1 and "smoothing" of S3, but there is a problem that jitter is included compared to the original TLV packet.

That is, in the section of the VALID signal shown in Fig. 8D, when the data DATA is always 184 bytes or always 185 bytes, smoothing can be performed because the output rate can be calculated even with the current function. As described above, when data stored in the payload portion of the divided TLV packet is recorded in the memory, the data becomes 184 bytes (FIG. 5A) and 185 bytes (FIG. 5B). Exists.

Also, jitter occurs because data with different numbers of bytes of 184 bytes and 185 bytes are randomly mixed, and in that case, the current function cannot cope with it. Therefore, for the jitter problem in the case where 184 bytes and 185 bytes of data are mixed as the payload data recorded in the memory, it is required what configuration allows smoothing to be performed with the lowest amount of memory. .

(The problem of delayed response)

In addition, in the multi-carrier transmission method, the order of arrangement of multiple frames (TSMF) is designated by the order of carriers (carrier_sequence) and frame position information (frame_position). It is a premise that the phase of the frame of is in order. Therefore, when the transmission delay time is different for each carrier in transmission, it is necessary to adjust the phase between the carriers in the processing on the receiving side.

Here, when the propagation delay time difference between carriers is large, it becomes difficult to search for the head position of the intended superframe at the time of transmission in the processing on the receiving side. Therefore, for example, in the trans-modulation operation specification (JLabs SPEC-034) formulated by the Japanese cable laboratory, a range of phase difference of the superframe at the time of reception is determined, and transmission to the receiving device 20 It is assumed that the propagation delay difference is absorbed or controlled so as to satisfy this range in the section.

Here, in the phase alignment of the superframe at a certain time, it is determined whether or not the superframe is in the same phase by the difference in arrival time between the superframe before and after the superframe and the superframe of another carrier. Therefore, the difference in arrival time needs to be less than 1/2 of one super frame. Since the frame at the head of the superframe needs to be included in the section less than 1/2, for example, in the above-described operation specification (JLabs SPEC-034), as shown in FIG. 9, 1 of 64QAM The phase difference range is less than 1/6 after subtracting the /3 super frame.

That is, in Fig. 9, when each carrier #1 to #3 passes through a different transmission path, there is a possibility that the delay between the carriers increases, and if each of the carriers #1 to #3 deviates by 1/2 superframe or more, The head of the frame cannot be detected and cannot be synthesized. Therefore, for example, as specified in the above-described operation specification (JLabs SPEC-034), it is necessary to cope with a delay of 1/6 superframe on the receiving side.

As described above, if it is a function as it is, firstly, by synthesizing and smoothing divided TLV packets, the problem that jitter is increased due to the need for re-smoothing when transforming the TLV packet, and secondly, when each carrier is delayed. Therefore, it is necessary to synchronize each carrier, and it is necessary to respond to a predetermined delay at the receiving side (e.g., corresponding to a 1/6 superframe delay at the receiving side according to the operating specification). There is a problem of not responding sufficiently.

In view of such a problem, the new function to which the present technology is applied makes it possible to reduce jitter when processing streams corresponding to multiple carriers. In addition, in the new function to which the present technology is applied, when each carrier is delayed, it is possible to cope with a predetermined delay at the receiving side (for example, corresponding to a delay required by the receiving side according to an operation specification). Hereinafter, the configuration and operation of the receiving device 20 having a new function will be described.

(Configuration of new function receiving device)

10 is a block diagram showing an example of the configuration of the reception device 20 having a new function.

In Fig. 10, the receiving device 20 having a new function includes tuners 201-1 to 201-4, demodulation ICs 202-1 to 202-4, and a system-on-chip 203.

The tuner 201-1 receives the broadcast signal transmitted from the transmission device 10, performs necessary processing, and transmits the resulting received signal (carrier #1 signal) to the demodulation IC 202-1. Supply. Like the tuner 201-1, the tuners 201-2 to 201-4 perform necessary processing on the broadcast signal, and receive the received signals (carriers #2 to #4 signals) obtained as a result of the demodulation IC. Supply to (202-2 to 202-4) respectively.

The demodulation IC 202-2 performs demodulation processing (for example, demodulation such as 64QAM or 256QAM) on the received signal (carrier #2 signal) supplied from the tuner 201-2, and the resulting transmission The stream is supplied to the demodulation IC 202-1. Like the demodulation IC 202-2, the demodulation IC 202-3 and the demodulation IC 202-4 perform demodulation processing on the received signal (carrier #3, #4 signal), and the resultant The transport stream is supplied to the demodulation IC 202-1.

The demodulation IC 202-1 includes a control unit 210, a demodulation unit 211, a TSMF processing unit 212-1 to 212-4, a TLV conversion unit 213-1 to 213-4, and a memory 214-1. To 214-4), and a selector 215. A received signal from the tuner 201-1 and a transport stream from the demodulation ICs 202-2 to 202-4 are input to the demodulation IC 202-1.

The control unit 210 controls the operation of each part of the demodulation IC 202-1. For example, the control unit 210 is configured with a processor such as a microcontroller.

The demodulation unit 211 performs demodulation processing (for example, demodulation such as 64QAM or 256QAM) on the received signal (carrier #1 signal) from the tuner 201-1, and transmits the resulting transport stream to TSMF. It is supplied to the processing unit 212-1.

The TSMF processing unit 212-1 performs TSMF processing on TSMF packets on the transport stream supplied from the demodulation unit 211. In this TSMF processing, for example, a TSMF packet (TSMF header) is detected from a transport stream extracted from a received signal (carrier #1 signal), or header information (extended information) of the TSMF header is extracted. Etc. are done.

The TSMF processing unit 212-1 supplies the extracted header information (extension information) of the TSMF header to the control unit 210. Further, the TSMF processing unit 212-1 supplies the transport stream supplied from the demodulation unit 211 to the TLV conversion unit 213-1.

Like the TSMF processing unit 212-1, the TSMF processing units 212-2 to 212-4 perform TSMF processing on the transport streams from the external demodulation ICs 202-2 to 202-4, respectively, and the TSMF header The header information (extension information) of is supplied to the control unit 210, respectively. Further, the TSMF processing units 212-2 to 212-4 supply transport streams from the external demodulation ICs 202-2 to 202-4 to the TLV conversion units 213-2 to 213-4, respectively. .

The TLV conversion unit 213-1 records data of the divided TLV packet (the payload unit) included in the transport stream supplied from the TSMF processing unit 212-1 in the memory 214-1. Further, the TLV conversion unit 213-1 supplies information indicating the amount of data recorded in the memory 214-1 to the control unit 210.

Like the TLV conversion unit 213-1, the TLV conversion units 213-2 to 213-4 convert the data of the divided TLV packets (payload unit of) from the TSMF processing units 212-2 to 212-4. , Are recorded in the memories 214-2 to 214-4, respectively. Further, the TLV conversion units 213-2 to 213-4 supply information indicating the amount of data recorded in the memories 214-2 to 214-4 to the control unit 210, respectively.

Further, the memories 214-1 to 214-4 are buffer memories (for example, semiconductor storage devices such as RAM (Random Access Memory)) having a predetermined capacity.

The control unit 210 includes header information (extended information) of the TSMF header from the TSMF processing units 212-1 to 212-4, and information indicating the amount of recorded data from the TLV conversion units 213-1 to 213-4. Is supplied.

The control unit 210 calculates the total amount of data recorded in the predetermined frame section and the time of the predetermined frame section based on the recorded data amount and header information (extended information), and responds to smoothing in response to the calculation result. Generates a clock for reading data. The control unit 210 reads the data recorded in the memories 214-1 to 214-4 in a predetermined order by controlling the selector 215 based on the generated clock.

Further, the control unit 210 determines the timing of starting reading of data recorded in the memories 214-1 to 214-4, based on information such as header information (extension information). The control unit 210 controls the data read start (timing of) based on the determined read start timing.

Data (data after synthesis) read from the memories 214-1 to 214-4 are continuously output at a constant rate, and output to the system-on-chip 203 as an output stream.

The system-on-chip 203 performs predetermined processing, such as decoding, on the output stream input from the demodulation IC 202-1 (the selector 215 of), and the resulting video data (or image Data) is output to a display (not shown) at the rear stage, and audio data is output to an audio output device (not shown) at the rear stage.

The display is, for example, a display device (display device) such as a liquid crystal display (LCD) or an organic light emitting diode (OLED). The display displays an image (or image) corresponding to the image data (or image data) input from the system on chip 203.

The audio output device is, for example, a speaker. The audio output device outputs audio (sound) in response to audio data processed by the system-on-chip 203.

The reception device 20 having a new function is configured as described above.

Here, the new functions mainly include a header removal/smoothing function for solving the aforementioned jitter problem, and a delay response function for solving the aforementioned problem of delay correspondence. Therefore, the details of the header removal/smoothing function and the delay correspondence function will be sequentially described below.

(Example of header removal/smoothing function)

First, an example of a header removal/smoothing function among new functions will be described with reference to FIGS. 11 to 14.

Fig. 11 shows the operation of each part in the demodulation IC 202-1 corresponding to the header removal/smoothing function and the flow of the signal. 12 to 14 are flow charts for explaining the flow of processing corresponding to the header removal/smoothing function.

In addition, in FIG. 11, the notation of "S1XX" corresponds to each step S1XX of FIGS. 12 to 14, and in the description of FIGS. 12 to 14, the operation and signal flow of each part shown in FIG. Shall be referred to as appropriate. Incidentally, in this example, as shown in Fig. 11, it is assumed that four waves of carrier waves #1 to #4 are received by the reception device 20. As shown in FIG.

(Flow of carrier correspondence processing)

12, in the demodulation IC 202-1, the demodulation unit 211, the TSMF processing units 212-1 to 212-4, and the TLV conversion units 213-1 to 213-4 are The flow of carrier correspondence processing performed by this will be described.

In step S111, the demodulation unit 211 performs demodulation processing on the received signal (the signal of the first wave carrier #1) input thereto.

The transport stream obtained as a result of this demodulation process is supplied to the TSMF processing unit 212-1. Further, transport streams from external demodulation ICs 202-2 to 202-4 are input to the TSMF processing units 212-2 to 212-4, respectively. These transport streams are extracted from carrier waves #2 to #4 of the second to fourth waves.

Next, the TSMF processing (S113) by the TSMF processing units 212-1 to 212-4 and the TLV conversion processing (S114) by the TLV conversion units 213-1 to 213-4 are sequentially executed.

Here, as the initial values of the TSMF processing unit 212-N and the TLV conversion unit 213-N, until N=1 is set (S112) and N>4 (“YES” in S116), N is By repeating the loop of steps S113 to S116 while incrementing the value (S115), TSMF processing (S113) executed by each TSMF processing unit 212 and TLV conversion processing executed by each TLV transformation (213) It expresses (S114).

The TSMF processing unit 212-1 performs TSMF processing (S113) and supplies a transport stream including a TSMF packet identified by identification information (stream_id, original_network_id) to the TLV conversion unit 213-1, for example. do. In addition, in this TSMF process (S113), when a TSMF packet (the TSMF header) is detected from the transport stream, the header information (extended information) is notified to the control unit 210.

In addition, in the TSMF processing units 212-2 to 212-4, similarly to the TSMF processing unit 212-1, TSMF processing (S113) is performed, respectively.

The TLV conversion unit 213-1 performs TLV conversion processing for converting the divided TLV packets into TLV packets when the transport stream from the TSMF processing unit 212-1 includes a divided TLV packet (S114).

Here, FIG. 13 is a flowchart illustrating details of the TLV conversion processing corresponding to step S114 in FIG. 12.

In step S131, the TLV conversion unit 213-1 checks the TLV packet start indicator included in the split TLV packet header added to the split TLV packet.

In step S132, the TLV conversion unit 213-1 determines whether or not the TLV packet start indicator is "1" based on the result of the confirmation of the header unit.

When it is determined in step S132 that "1" is designated as the TLV packet start indicator, the process proceeds to step S133. In step S133, the TLV conversion unit 213-1 records 184 bytes of data in the payload portion of the divided TLV packet into the memory 214-1.

That is, when the TLV packet start indicator stored in the 3-byte divided TLV packet header (header part) is "1", the first TLV indication of 1 byte is inserted in the payload part, and 1 in addition to the 3-byte header part. Since the area of the TLV instruction at the head of the byte is secured, in the divided TLV packet consisting of 188 bytes, the data of the payload portion becomes the remaining 184 bytes (Fig. 5A).

On the other hand, when it is determined in step S132 that "0" is designated as the TLV packet start indicator, the process proceeds to step S134. In step S134, the TLV conversion unit 213-1 records 185 bytes of data in the payload portion of the divided TLV packet into the memory 214-1.

That is, when the TLV packet start indicator stored in the 3-byte divided TLV packet header (header part) is "0", the head TLV indication is not inserted in the payload part, and 1 byte in addition to the 3-byte header part. Since it is not necessary to secure the area of the head TLV instruction, in the divided TLV packet consisting of 188 bytes, the data of the payload portion becomes the remaining 185 bytes (FIG. 5B).

In the process of step S133 or S134, if 184 bytes or 185 bytes of data is written to the memory 214-1, the process proceeds to step S135.

In step S135, the TLV conversion unit 213-1 notifies the control unit 210 of the amount of data (for example, the number of bytes) recorded in the memory 214-1.

When the process of step S135 is finished, the process returns to step S114 of FIG. 12, and the process after that is repeated.

That is, in the TLV conversion units 213-2 to 213-4 as well as the TLV conversion unit 213-1, TLV conversion processing (S114) is respectively performed, and for the memories 214-2 to 214-4, Data of 184 bytes or 185 bytes of the payload portion of the divided TLV packet are recorded (S133 or S134 in FIG. 13). Further, in the TLV conversion units 213-2 to 213-4, the amount of data recorded in the memories 214-2 to 214-4 is notified to the control unit 210, respectively (S135).

When the loop of steps S113 to S116 is finished, the process advances to step S117. In step S117, it is determined whether or not the process is ended.

If it is determined in step S117 that the processing is not to be finished, the processing returns to step S111, and the above-described processing is repeated. In addition, when it is determined in step S117 that the processing is to be ended, the carrier correspondence processing in Fig. 12 is ended.

The flow of carrier correspondence processing has been described above. In this carrier correspondence process, the TLV conversion units 213-1 to 213-4 remove the divided TLV packet header when data of the divided TLV packets are respectively recorded in the memories 214-1 to 214-4. , Only data of the payload portion (184 bytes or 185 bytes of data) is recorded (S133 or S134 in FIG. 13).

In addition, in the description of FIGS. 12 and 13, for the convenience of explanation, TSMF processing (S113) by the TSMF processing units 212-1 to 212-4 is sequentially executed for each carrier, and the TLV conversion unit 213-1 Although it is said that the TLV conversion processing (S114) by 213-4) is sequentially executed for each carrier, in reality, as shown in Fig. 11, TSMF processing (S113) and TLV conversion processing (S114) are performed for each carrier. It runs in parallel.

(Flow of data readout clock control processing)

Next, with reference to the flowchart of Fig. 14, the flow of the data readout clock control process executed by the control unit 210 of the demodulation IC 202-1 will be described. In addition, this data readout clock control process is executed in parallel with the above-described carrier wave correspondence process (Figs. 12 and 13).

In step S151, the control unit 210 acquires header information (extension information) of the TSMF header notified from the TSMF processing units 212-1 to 212-4, respectively.

In step S152, the control unit 210 acquires the amount of recorded data notified from the TLV conversion units 213-1 to 213-4, respectively.

In step S153, the control unit 210 determines the total amount of data recorded in the memories 214-1 to 214-4 in one super frame section, based on the reported amount of recorded data (for example, the number of bytes). Calculate (for example, the total number of bytes).

In step S154, the control unit 210 calculates the time of one super frame section based on the notified header information (extended information) of the TSMF header. Here, for example, by using the frame position information (frame_position) included in the extension information of the header information, it is possible to calculate the time of one superframe section.

In step S155, the control unit 210 generates a clock for reading data corresponding to smoothing based on the calculated amount of all data recorded in one super frame section and the time of one super frame section.

Here, as a clock for data reading, for example, a constant rate obtained from the relationship between the total amount of data recorded in one superframe section (for example, the total number of bytes) and the time in one superframe section (e.g. For example, a clock corresponding to the bit rate (unit: Mbps) is generated. In addition, as a technique related to smoothing, for example, a technique disclosed in Japanese Unexamined Patent Application Publication No. 2012-205266 is known, and the same technique can be used here.

In step S156, the control unit 210 reads the data recorded in the memories 214-1 to 214-4 by controlling the selector 215 based on the generated data reading clock.

Here, in response to the data reading clock, the control unit 210 can determine the order of reading of the memories 214-1 to 214-4, for example, as follows in controlling the reading of data. .

That is, for example, in the standard standard for digital cable television broadcasting (JCTEA STD-002-6.1.1) established by the Japan CATV Technology Association, the order of arrangement of the slots of the superframes of each carrier is defined, The control unit 210 can determine the read order of the memories 214-1 to 214-4 in which data obtained from the signals of each carrier (carriers #1 to #4) are recorded based on the slot arrangement order. have. However, when controlling the read order of the memory 214, information such as header information (extension information) of the TSMF header may be used.

In step S157, it is determined whether or not the process is ended.

When it is determined in step S157 that the process is not to be finished, the process returns to step S151, and the above-described process is repeated. In addition, when it is determined in step S157 that the processing is to be ended, the data read clock control processing in Fig. 14 is ended.

In the above, the flow of the data read clock control process has been described.

In this data readout clock control process, the TSMF header header information (extension information) from the TSMF processing units 212-1 to 212-4 and the TLV Since the amount of recorded data from the conversion units 213-1 to 213-4 is sequentially notified (S151 and S152 in Fig. 11), the control unit 210 determines their header information (extension information) and the amount of recorded data. Based on this, a clock for reading data corresponding to smoothing is generated (S153 to S155 in Fig. 11), and the reading of data is controlled (S156 in Fig. 11), so that smoothing is realized.

As described above, the above-described jitter problem can be solved by the header removal/smoothing function as a new function.

That is, in this header removal/smoothing function, the divided TLV packet header is removed to record the data of the payload portion in the group where the data of the divided TLV packet is to be recorded in the memories 214-1 to 214-4, respectively. When reading data from the memories 214-1 to 214-4 together (processing shown in Figs. 12 and 13), smoothing is performed based on the amount of recorded data, etc. (processing shown in Fig. 14 ), for example, when data is written to the memories 214-1 to 214-4, even when data having different numbers of bytes of 184 bytes and 185 bytes are randomly mixed, it becomes possible to perform more complete smoothing.

As a result, since jitter can be reduced (reduced) when data with different numbers of bytes are randomly mixed when writing data, it becomes possible to solve the aforementioned jitter problem (smoothing with the lowest amount of memory). It becomes possible to provide a configuration that performs). In addition, the configuration of the demodulation IC 202-1 (FIG. 10) of the reception device 20 having the new function is compared with the configuration of the demodulation IC 902 (FIG. 7) of the reception device 20 having the function of the current state. In this case, in the demodulation IC 902 of the current function (Fig. 7), it is necessary to perform smoothing twice, but in the demodulation IC 202-1 (Fig. 10) of the new function, it ends with one smoothing, for example It becomes possible to reduce the number of memories and circuits.

(Example of delay response function)

Next, an example of a delay correspondence function among new functions will be described with reference to FIGS. 15 to 17.

Fig. 15 shows an example of setting the data read start timing by the delay correspondence function.

In FIG. 15, four carrier waves #1 to #4 are received by the reception device 20. In the demodulation IC 202-1, transport streams corresponding to the signals of carriers #1 to #4 are input to the TSMF processing units 212-1 to 212-4, respectively. Here, it is assumed that each carrier is delayed. do.

That is, paying attention to carrier #1, the delay increases with respect to carrier #1 as a reference in the order of carrier #2, carrier #3, and carrier #4. However, in this example, the amount of delay (delay time) for carrier #1 in carrier #2, carrier #3, and carrier #4 is less than 1/2 of the superframe section (of the time corresponding to the length of one superframe). Less than 1/2).

In addition, in the demodulation IC 202-1, the memories 214-1 to 214-4 have a capacity corresponding to data for 3/2 super frame periods (1 super frame period + 1/2 super frame period). It is assumed that each is prepared.

In the demodulation IC 202-1, TSMF processing by the TSMF processing units 212-1 to 212-4 is performed, respectively, and TLV conversion processing by the TLV conversion units 213-1 to 213-4 is performed, respectively, In the memories 214-1 to 214-4, data obtained from the signals of the four carrier waves #1 to #4 are sequentially recorded, respectively.

Here, the control unit 210 is based on the header information (extension information) of the TSMF header notified from the TSMF processing units 212-1 to 212-4, respectively, of each carrier to be synthesized according to the frame position information (frame_position). Identify the leading position. In the example of FIG. 15, among carriers #1 to #4, the leading position of carrier #1 (reference carrier) is identified.

Further, the control unit 210 calculates a read start time Ts as a timing to start reading data recorded in the memories 214-1 to 214-4, respectively. Here, for example, of the four carriers #1 to #4, the reading start time (Ts) based on the head of the reference carrier #1 (the most preceding carrier #1) is 1 superframe. For the time (Tsf) corresponding to the length of, the relationship as shown in Equation (1) below is satisfied.

Ts <1/2 × Tsf… (One)

However, the read start time (Ts) is the most delayed when, for example, as shown in FIG. 15, based on the head of the most preceding carrier #1 among the four carriers #1 to #4. The timing is temporally later than the head of the carrier #4.

Then, the control unit 210 controls the selector 215 to start reading the data recorded in the memories 214-1 to 214-4 at the timing of the reading start time Ts.

By starting data reading at such a timing, a composite stream can be obtained as an output stream. As shown in Fig. 15, if the reading start time Ts is later than the head of the carrier #4 which is the most delayed , It is possible to absorb the delay of each carrier of carrier #2, carrier #3, and carrier #4 with respect to carrier #1.

(Flow of data read start timing control processing)

Next, with reference to the flow chart of Fig. 16, a flow of the data read start timing control process executed by the control unit 210 of the demodulation IC 202-1 will be described. In addition, this data read start timing control process can be executed in parallel with the above-described carrier correspondence process (Figs. 12 and 13) and data read clock control process (Fig. 14).

In step S171, the control unit 210 acquires header information (extension information) of the TSMF header notified from the TSMF processing units 212-1 to 212-4, respectively.

In step S172, the control unit 210 identifies the head position of each carrier to be synthesized based on the frame position information (frame_position) included in the notified header information (extension information). Here, for example, when carrier #2, carrier #3, and carrier #4 are delayed with respect to carrier #1, the head position of carrier #1 (reference carrier) among carriers #1 to #4 Is identified.

In step S173, the control unit 210 determines the timing of starting reading of the data recorded in the memories 214-1 to 214-4. Here, as the time from the head position of the identified carrier #1 to the start of reading, the reading start time Ts that satisfies the relationship of the above-described equation (1) is determined.

In step S174, the control unit 210 controls to start reading of the data recorded in the memories 214-1 to 214-4 when the reading start time Ts comes, based on the determined reading start timing. .

In the above, the flow of the data read start timing control process has been described.

As described above, the delay response problem described above can be solved by the delay response function as a new function.

That is, in this delay response function, a memory (214-1 to 214-4) is provided for each of a plurality of carriers (for example, carriers #1 to #4), and reading starts satisfying the relationship of equation (1) described above. At the timing of time Ts, the reading of the data recorded in the memories 214-1 to 214-4 is started to absorb the delay of each carrier, so that the reception side responds to a predetermined delay (e.g. For example, it is possible to cope with the delay required by the receiving side according to the operating specification (it is possible to synchronize each carrier in which the delay occurs).

In addition, in the demodulation IC 202-1 (FIG. 10) of the receiving device 20 having a new function, the configuration shown in FIG. 10 can cope with a predetermined delay at the receiving side. For example, delay matching Since circuits, such as the circuit of, become unnecessary, it becomes possible to reduce the number of circuits.

(Example of other configuration of demodulation IC)

17 is a block diagram showing an example of another configuration of a demodulation IC corresponding to a delay correspondence function.

In FIG. 17, the demodulation IC 202-1 is composed of a demodulation unit 211, a TSMF processing unit 212-1 to 212-4, a memory 214-1 to 214-4, and a selector 215. . That is, the demodulation IC 202-1 of FIG. 17 differs from the demodulation IC 202-1 of FIG. 10 in that the TLV conversion units 213-1 to 213-4 are excluded.

The TSMF processing unit 212-1 performs TSMF processing on the transport stream from the demodulation unit 211, and records data obtained as a result in the memory 214-1.

The TSMF processing units 212-2 to 212-4, similarly to the TSMF processing unit 212-1, perform TSMF processing on the transport streams from the external demodulation ICs 202-2 to 202-4, respectively, and the result The obtained data is recorded in the memories 214-2 to 214-4, respectively.

The control unit 210 is notified of the header information (extension information) of the TSMF header from the TSMF processing units 212-1 to 212-4. The control unit 210 is a timing to start reading the data recorded in the memories 214-1 to 214-4, respectively, based on the header information (extension information) of the notified TSMF header, as described above in Equation (1). The reading start time (Ts) that satisfies the relationship of is calculated.

Then, the control unit 210 controls the selector 215 to start reading the data recorded in the memories 214-1 to 214-4 at the timing of the reading start time Ts.

As described above, in the configuration shown in Fig. 17, the TLV conversion units 213-1 to 213-4 are excluded, but not a TLV packet as a variable-length packet, but a TS packet as a fixed-length packet (a fixed length of 188 bytes). Packet), it is possible to directly write the data to the memories 214-1 to 214-4 without passing through the TLV conversion units 213-1 to 213-4, Even in the same case, the delay response function is applied.

That is, in the case of adopting the multi-carrier transmission method, when processing (combining) fixed-length packets such as TS packets with the demodulation IC 202-1 on the receiving side, only the delay-response function among the above-described new functions is performed. Can be applied.

<2. Variation example>

(Different configuration of the receiving device)

In addition, in the above description, it has been described that the reception device 20 (Fig. 1) is configured as a fixed receiver such as a television receiver or a set top box (STB), but the fixed receiver includes, for example, a recorder, a game machine, A personal computer, network storage, or the like may be included. In addition, the receiving device 20 is not limited to a fixed receiver, for example, a mobile receiver such as a smartphone or a mobile phone, a tablet computer, a vehicle-mounted device mounted on a vehicle such as a vehicle-mounted television, and a head-mounted display. An electronic device such as a wearable computer such as (HMD: Head Mounted Display) may be included.

Further, the demodulation IC 202-1 (demodulation device) constituting the reception device 20 (FIG. 1) may be grasped as a reception device or a demodulation device to which the present technology is applied. In addition, in the above description, the number of multiple carriers is 2 to 4, but if the number of carriers is 2 or more, any number may be used (for example, 5 or more may be sufficient).

At this time, in the reception device 20 (FIG. 10), the tuners 201-1 to 201-N and the demodulation ICs 202-1 to 202-N in response to the number of N (N is an integer of 2 or more) carriers. ) Is provided. In addition, in the demodulation IC 202-1 (FIG. 10), one demodulation unit 211, N TSMF processing units 212-1 to 212-N, and N TLV conversion units 213-1 to 213 -N) and N memories 214-1 to 214-N are provided, respectively. In addition, the tuner 201, the demodulation IC 202, the TSMF processing unit 212, the TLV conversion unit 213, and the memory 214 are not limited to the same number as the number of carriers, but a number greater than the number of carriers is provided. You may do it.

(Configuration including communication line)

In addition, in the transmission system 1 (FIG. 1), although not shown, various servers are connected to a communication line such as the Internet, so that the reception device 20 (FIG. 1) having a communication function is Various types of data, such as contents and applications, may be received by accessing various servers through a communication line and performing two-way communication.

(Other)

In addition, the terms described in the present specification are only examples, and the use of other terms is not intentionally excluded. For example, in the above description, frames may be replaced with other terms such as packets, for example.

<3. Computer configuration>

The above-described series of processing can be executed by hardware or software. When a series of processing is executed by software, a program constituting the software is installed on the computer. 18 is a diagram showing a configuration example of hardware of a computer that executes the series of processes described above by means of a program.

In the computer 1000, a CPU (Central Processing Unit) 1001, a ROM (Read Only Memory) 1002, and a RAM (Random Access Memory) 1003 are connected to each other by a bus 1004. An input/output interface 1005 is further connected to the bus 1004. An input unit 1006, an output unit 1007, a recording unit 1008, a communication unit 1009, and a drive 1010 are connected to the input/output interface 1005.

The input unit 1006 includes a keyboard, a mouse, and a microphone. The output unit 1007 is made of a display, a speaker, or the like. The recording unit 1008 is made of a hard disk, a nonvolatile memory, or the like. The communication unit 1009 is made of a network interface or the like. The drive 1010 drives a removable recording medium 1011 such as a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory.

In the computer 1000 configured as described above, the CPU 1001 transfers a program recorded in the ROM 1002 or the recording unit 1008 to the RAM 1003 through the input/output interface 1005 and the bus 1004. By loading and executing, the series of processing described above is performed.

The program executed by the computer 1000 (CPU 1001) can be provided by recording it on the removable recording medium 1011 as a package medium or the like, for example. In addition, the program can be provided through a wired or wireless transmission medium such as a local area network, the Internet, or digital satellite broadcasting.

In the computer 1000, the program can be installed in the recording unit 1008 through the input/output interface 1005 by attaching the removable recording medium 1011 to the drive 1010. Further, the program can be received by the communication unit 1009 through a wired or wireless transmission medium and installed in the recording unit 1008. In addition, the program can be installed in advance in the ROM 1002 or the recording unit 1008.

Here, in this specification, the processing performed by the computer according to the program does not necessarily need to be performed in time series according to the order described as a flow chart. That is, the processing performed by the computer according to the program also includes processing that is executed in parallel or individually (for example, parallel processing or processing by objects). In addition, the program may be processed by one computer (processor) or distributedly processed by a plurality of computers.

In addition, the embodiment of the present technology is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present technology.

In addition, the present technology can have the following configuration.

(One)

When a divided variable length packet obtained by dividing a variable length packet is included as a transport stream transmitted for each of a plurality of carriers, data of the payload unit among the header unit and the payload unit constituting the divided variable length packet are sequentially When writing to the memory, a receiving device comprising a control unit for controlling a clock for reading the data recorded in the memory based on the amount of data recorded in the section of the predetermined frame and the time of the section of the predetermined frame .

(2)

A plurality of conversion units provided in response to the number of carriers,

Further comprising a plurality of the memories provided corresponding to the plurality of conversion units,

The receiving apparatus according to (1), wherein each of the conversion units removes the header unit from the inputted divided variable length packet and writes the data of the payload unit to the corresponding memory.

(3)

The control unit,

Based on the amount of recorded data notified from each of the conversion units, the total amount of data recorded in the plurality of the memories in the section of the predetermined frame is calculated,

Based on header information of a multi-frame header included in the predetermined frame, the time of the section of the predetermined frame is calculated,

The reception device according to (2) above, based on the results of these calculations, controlling the clock for reading the data recorded in each of the plurality of memories.

(4)

The clock corresponds to any one of (1) to (3) above, which is a clock corresponding to a constant rate obtained from the relationship between the total amount of data recorded in the section of the predetermined frame and the time of the section of the predetermined frame. The described receiving device.

(5)

The receiving device according to (3) or (4), wherein the control unit controls an order of reading the data from a plurality of the memories based on an arrangement order of slots allocated in a predetermined unit for each of the carriers.

(6)

When a delay occurs in the carrier, the control unit sets the read start time based on the head of the reference carrier among the plurality of carriers as Ts, and the time corresponding to the length of the predetermined frame as Tsf. And the reception device according to (3) above, wherein at the timing of the reading start time (Ts) (however, Ts <1/2 × Tsf), the reading of the data recorded in each of the plurality of memories is controlled to start.

(7)

The delay is a delay of less than 1/2 of the time corresponding to the length of the predetermined frame, between each of the plurality of carriers,

The reception device according to (6), wherein the read start time (Ts) becomes a timing later in time than the head of the most delayed carrier when the most preceding carrier among the plurality of carriers is used as a reference carrier.

(8)

The receiving device according to (6) or (7), wherein the control unit identifies the heads of the plurality of carriers based on frame position information of the carriers included in header information of the multi-frame header.

(9)

The reception device according to any one of (1) to (8), wherein the predetermined frame includes a frame composed of a plurality of multiple frames.

(10)

Each of the conversion units is configured to be recorded in the corresponding memory when the head of the variable length packet is included in the payload unit of the divided variable length packet and the head of the variable length packet is not included. The receiving device according to (2) or (3) above, wherein the amount of data in the payload portion is different.

(11)

The receiving device according to any one of (1) to (10), configured as a demodulation device.

(12)

The receiving device,

As a transport stream transmitted for each of a plurality of carriers, when a divided variable length packet obtained by dividing a variable length packet is included, data of the payload unit among the header unit and the payload unit constituting the divided variable length packet are sequentially A receiving method for controlling a clock for reading the data recorded in the memory when writing to the memory, based on the amount of data recorded in the section of the predetermined frame and the time of the section of the predetermined frame.

1: transmission system
10: transmitting device
20: receiving device
30: CATV transmission path
201, 201-1 to 201-4: tuner
202, 202-1 to 202-4: demodulation IC
203: system on a chip (SoC)
210: control unit
211: demodulation unit
212, 212-1 to 212-4: TSMF processing unit
213, 213-1 to 213-4: TLV conversion unit
214, 214-1 to 214-4: memory
215: selector
1000: computer
1001: CPU

Claims (12)

As a transport stream transmitted for each of a plurality of carriers, when a divided variable length packet obtained by dividing a variable length packet is included, data of the payload unit among the header unit and the payload unit constituting the divided variable length packet are sequentially And a control unit for controlling a clock for reading the data recorded in the memory based on the amount of data recorded in the section of the predetermined frame and the time of the section of the predetermined frame when writing to the memory. Receiving device. The method of claim 1,
A plurality of conversion units provided in response to the number of carriers,
Further comprising a plurality of the memories provided corresponding to the plurality of conversion units,
Wherein each of the conversion units removes the header unit from the inputted divided variable length packet and writes the data of the payload unit to the corresponding memory. The method of claim 2,
The control unit,
Based on the amount of recorded data notified from each of the conversion units, the total amount of data recorded in the plurality of the memories in the section of the predetermined frame is calculated,
Based on header information of a multi-frame header included in the predetermined frame, the time of the section of the predetermined frame is calculated,
And controlling the clock for reading the data each recorded in a plurality of the memories based on a result of their calculation. The method of claim 3,
And the clock is a clock corresponding to a constant rate obtained from a relationship between the total amount of data recorded in the section of the predetermined frame and the time of the section of the predetermined frame. The method of claim 3,
And the control unit controls an order of reading the data from a plurality of the memories based on an arrangement order of slots allocated in a predetermined unit for each of the carriers. The method of claim 3,
When a delay occurs in the carrier, the control unit sets the read start time based on the head of the reference carrier among the plurality of carriers as Ts, and the time corresponding to the length of the predetermined frame as Tsf. , At a timing of the read start time (Ts) (however, Ts <1/2 × Tsf), control to start reading of the data respectively written to the plurality of memories. The method of claim 6,
The delay is a delay of less than 1/2 of the time corresponding to the length of the predetermined frame, between each of the plurality of carriers,
The reception device, wherein the read start time (Ts) is a timing later in time than the head of the most delayed carrier when the most preceding carrier among the plurality of carriers is used as a reference carrier. The method of claim 7,
And the control unit identifies the heads of the plurality of carriers based on frame position information of the carriers included in header information of the multi-frame header. The method of claim 1,
The receiving device, wherein the predetermined frame includes a frame composed of a plurality of multiple frames. The method of claim 2,
Each of the conversion units writes to the corresponding memory when the head of the variable length packet is included in the payload unit of the divided variable length packet and the head of the variable length packet is not included. The receiving device, characterized in that the data amount of the payload unit is different. The method of claim 1,
A receiving device configured as a demodulation device. The receiving device,
As a transport stream transmitted for each of a plurality of carriers, when a divided variable length packet obtained by dividing a variable length packet is included, data of the payload unit among the header unit and the payload unit constituting the divided variable length packet are sequentially A receiving method comprising controlling a clock for reading the data recorded in the memory when writing to the memory, based on the amount of data recorded in the section of the predetermined frame and the time of the section of the predetermined frame. .

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