JPH11232110A - Digital broadcast downloading system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the reliability and efficiency in a downloading data processing by attaching additional data at the time of transmission and reception and improving the reception method. SOLUTION: An information capable of gathering data by a suitable block unit and storing them in a memory 15 and an information for separating error detection information 13 and program data 14 are added and three kinds of the data which are header information 12, the error detection information 13 and the program data 14 are transmitted by a packet switching system as downloading data. The suitable block unit is a size suitable for the erasure/ storage of a nonvolatile memory 19. In a reception system, by the information for separating the error detection information 13 and the program data 14, the program data 17 and the error detection information 16 are separated, gathered by the suitable block unit and stored in the memory 15. Thereafter, the error detection of the program data 17 is performed in a CPU 18 by using the error detection information 16 and they are stored in the nonvolatile memory 19 by the block unit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital broadcast download system, and more particularly to a digital broadcast download system for transmitting and receiving a large amount of download data by dividing it into packets.

[0002]

2. Description of the Related Art When software is improved / changed using a digital broadcast download data transmission / reception system, a receiver needs to identify and receive download data for its own device according to manufacturer, model, version, and the like. . When the data has a large capacity as in the MPEG or other standard, it is necessary to divide the data into packets and transmit the data in order to share the transmission path with other services without monopolizing the transmission path.

The prior art for this will be described with reference to the drawings. FIG. 5 is a block diagram of a download transmission system. In the transmission system, encoded video data 51, audio data 52, and data broadcast data 5 are encoded as shown in FIG.
3. The program information 56 and the download data 54 are multiplexed by the multiplexing unit 55 to form a bit stream. The bit stream is converted into a transport stream by a transmission encoding unit 57, and the modulation unit 58 modulates and transmits the transport stream.

FIG. 6 is a block diagram of a download receiving system. In the receiving system, as shown in FIG. 6, a received signal is decoded into a transport stream by a demodulation section 61, and the transport stream is converted into a video signal by a separation section 62. Data 67, audio data 68, data broadcasting data, and download data are separated. The video data 67 and the audio data 68 are sent to the video / audio processing unit 66, and the download data is subjected to arithmetic processing in the arithmetic unit 63.

The download data transmitted in packet units is as shown in FIG. 7, and it is necessary to store the data 72 in the nonvolatile memory 64 based on the header information 71 of the packet 73 of the download data. After receiving all the download data, the receiver is activated by the newly downloaded program data 65.

[0006]

However, in the prior art, as shown in FIG. 8, the download data can only be handled as a packet unit. Therefore, the capacity of the packet unit 81 and the unit 82 that can be handled by the non-volatile memory are limited. If they are different, it is necessary to repeat the control of the non-volatile memory, etc. In addition, compared to the video data and the audio data, although the download data is required to have reliability, only error detection in packet units can be performed. Since it cannot be performed, an error that spans a plurality of packets has not been detected.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to improve reliability and efficiency in download data processing by attaching additional data at the time of transmission and reception and improving the reception method. Digital broadcasting download system.

[0008]

According to a first aspect of the present invention, in a digital broadcast download system, download data divided into packets and transmitted is divided into blocks each having a size suitable for erasing and storing in a nonvolatile memory means. A digital broadcast download system comprising: means for temporarily storing the data collectively in a memory means; and means for storing the download data stored in the memory means in a nonvolatile memory means in block units.

According to a second aspect of the present invention, in a digital broadcast download system, an arithmetic processing unit for processing download data, a memory unit for temporarily storing download data, and a non-volatile memory for storing the download data Means, means for temporarily storing the download data divided into packets into blocks in a size suitable for erasing and storing in the nonvolatile memory means, and temporarily storing the downloaded data in the memory means; Means for determining a storage area in the nonvolatile memory means from header information for download data transmission, and download data temporarily stored in the memory means in block units according to the determination result to the nonvolatile memory means It is characterized by having means for storing in block units. It is a digital broadcasting system download to.

According to a third aspect of the present invention, in the digital broadcast download system according to the first or second aspect, the means for temporarily storing the download data in the memory means includes the step of storing the download data in parallel with the memory means. The means for temporarily storing, and the means for storing the download data in the non-volatile memory means in block units are means for collectively storing the download data of a plurality of blocks in the non-volatile memory means. A digital broadcast download system characterized by the following.

According to a fourth aspect of the present invention, there is provided the digital broadcast download system according to any one of the first to third aspects, wherein the download data is transmitted from the download data or the header information for transmitting the download data to the program data and the block. Means for separating error detection information for a unit or a plurality of packets and temporarily storing the error detection information in the memory means, and performing error detection of the program data using the error detection information for each block or each plurality of packets. And a digital broadcast download system.

According to a fifth aspect of the present invention, in the digital broadcast download system according to the fourth aspect, the error detection information is transmitted as one packet together with program data. is there.

According to a sixth aspect of the present invention, in the digital broadcast download system according to the fourth aspect, the error detection information is transmitted as one packet of download data. is there.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the standards such as MPEG, data cannot be transmitted collectively, so that large-volume download data needs to be divided into packets and transmitted.
However, it is inefficient to write the download data in a nonvolatile memory (flash memory) in the size of a packet. Accordingly, the present invention provides a digital broadcast download system used when improving the software of a transmission destination. In a digital broadcast download system, received data is stored in a nonvolatile memory in a size suitable for erasing and storing, that is, a "block" having a size that is easy to process. To temporarily store the downloaded data in the memory, and store the downloaded data stored in the memory in block units in the nonvolatile memory. More specifically, the downloaded data or a header for transmitting the downloaded data is stored. A storage area to be stored in a nonvolatile memory is determined from information, and download data temporarily stored in a memory in block units is stored in the nonvolatile memory according to the determination result, thereby efficiently processing data. It is. Further, in order to improve the reliability of the download system, error detection information for the block unit or a plurality of packets is also transmitted at the same time, and error detection is performed for the block unit or for each of the plurality of packets using the error detection information. Thus, a digital broadcast download system that improves the reliability of the download system is provided.

FIG. 1 is a block diagram schematically showing a download system according to the present invention, in which 11 is download data, 15 is a memory for temporarily storing the download data, 18 is error detection information 16 and the like. A CPU (arithmetic processing unit) for performing arithmetic processing such as error detection of the program data 17, and a non-volatile memory 19 for storing the program data.

Before describing the embodiments of the present invention,
First, the present invention will be schematically described with reference to FIG. The transmission system adds, to the download data, information such that the data can be collected in a suitable block unit and stored in the memory 15 and information for separating the error detection information 13 and the program data 14 from each other. Information, error detection information 13 for the block unit or a plurality of packets, and program data 14 are transmitted as download data by a packet switching method. Here, the preferred block unit means a size suitable for erasing and storing the nonvolatile memory 19. In the receiving system, the download data is converted to the program data 17 by the information for separating the error detection information 13 and the program data 14.
And error detection information 16, and the information is stored in the memory 15 using information that can be stored in the memory 15 in the above-described suitable block unit. Thereafter, the error detection information 16
Is used to detect an error in the program data 17 using the CPU.
Then, the program data 17 is stored in the nonvolatile memory 19 in block units.

Next, an embodiment of the present invention will be specifically described with reference to the drawings. FIG. 2 is a block diagram showing a first embodiment of the digital broadcast download system according to the present invention. As shown in FIG.
M23, a receiver equipped with a nonvolatile memory 25 is used. In the figure, 21 is a unit packet for transmitting download data, 22 is a CPU for erasing and storing received data, and 23 is a DR for temporarily storing the received data.
AM (memory) 25 is a nonvolatile memory for finally storing download data.

In the transmission system, program information is divided into units of, for example, 2 KB, and header information for download data transmission is transmitted as one packet. In this packet, information indicating a storage area when the download data is stored in the nonvolatile memory 25 is inserted. In the receiving system, the download data stored in the DRAM 23 is a block 2 of 64 KB.
The reception of the download data divided into packets and transmitted is repeated until the number of packets reaches four. When the reception of the download data in the block 24 is completed, the CPU 22
Calculates the storage area of the nonvolatile memory 25 based on the information indicating the storage area when the download data is stored in the nonvolatile memory 25, initializes the storage area, and thereafter stores the download data in the nonvolatile memory 25 in block units. To store. By repeating the above operation, all of the download data can be received and stored in the nonvolatile memory 25. After that, the software is improved by restarting the receiver using the download data stored in the nonvolatile memory 25.

FIG. 3 is a block diagram showing a second embodiment of the digital broadcast download system according to the present invention. In the figure, 31 is a packet, 32 is a CPU, and 33 is a D.
The RAM 34 is a unit block having a capacity of 64 KB for storing a plurality of packets in the DRAM 33, and the nonvolatile memory 35 is the same as that described with reference to FIG.

The transmission system uses the same system as the first embodiment. In the receiving system, as shown in FIG. 3, the download data divided into packets 31 and transmitted is collected in a block
3, the reception of the download data is repeated. Two or more such receptions are performed in parallel. When all of the download data in a certain block is completed while the data is being received in a plurality of blocks, the data of the block is stored in the nonvolatile memory 35 using information indicating a storage area when the download data is stored in the nonvolatile memory 35. The CPU 32 calculates the storage area of the non-volatile memory 35, initializes the storage area, and then records the download data in the nonvolatile memory 35. At this time, data processing is performed on the download data of a plurality of blocks collectively by an arithmetic processing unit or the like, and the download data is written to the nonvolatile memory. By repeating the above operation, all of the download data is received and recorded in the nonvolatile memory 35. Then, the software is improved by restarting the receiver using the download data stored in the nonvolatile memory 35.

FIG. 4 is a block diagram showing a third embodiment of the digital broadcast download system according to the present invention. In FIG. 4, reference numeral 41 denotes a packet, 45 denotes a DRAM, 48 denotes a CPU, and 49 denotes a nonvolatile memory. The details are the same as those described in connection with FIG.

In the transmission system, the program data 44 divided into units of, for example, 2 KB, the error detection information 43 for each block or a plurality of packets, the storage area in the nonvolatile memory 49, the error detection information 43, and the program data The three types of data of the header information 42 including information for separating the
Transmit as 1. In the receiving system, the received download data is separated into program data and error detection information by the header information 42. The program data is stored in the DRAM 45 for each block 46 in the same manner as in the first embodiment.
It is stored in another area 47 in the AM 45. After collecting the program data and error detection information of all or a plurality of packets stored in one block, the receiving system performs the error detection of the program data in the block unit or the plurality of packets by the CPU 48. . As a result of the error detection, if the program data in the block is normal, the storage area of the non-volatile memory 49 is calculated based on the header information 42, and the program data in the form of a block is stored in the non-volatile memory 49. Conversely, if an error is found in the program data in the block, the data in the block is erased and the reception of download data is requested again. By repeating this operation, all the download data is checked for errors and recorded in the nonvolatile memory 49. As described above, the error check can be performed on a block basis, so that the reliability of the download data can be improved. Then, the software is improved by restarting the receiver using the download data stored in the nonvolatile memory 49.

[0023]

According to the first and second aspects of the present invention, in a digital broadcast download system, a processing unit of download data in a receiver is grouped from a packet unit at the time of reception to a block unit suitable for performing data processing. Thereby, data processing can be performed efficiently.

Advantageous Effect Corresponding to Claim 3: In addition to the effect of Claim 1 or 2, it is also possible to handle large-scale data collectively by processing data in parallel, and collectively update download data. So you can do
The download data of the old version can be kept until just before the update, and the restoration to the old version is also easy.

Advantageous Effects Corresponding to Claims 4 to 6: In addition to the advantageous effects according to any one of claims 1 to 3, an error detection function limited to a packet is replaced with an error detection function spanning a block unit or a plurality of packets. By expanding to, the error detection becomes easier and more accurate, and the reliability of the downloaded data can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an outline of a digital broadcast download system according to the present invention.

FIG. 2 is a block diagram illustrating a digital broadcast download system according to a first embodiment of the present invention.

FIG. 3 is a block diagram illustrating a digital broadcast download system according to a second embodiment of the present invention.

FIG. 4 is a block diagram illustrating a digital broadcast download system according to a third embodiment of the present invention.

FIG. 5 is a block diagram showing a conventional download data transmission system.

FIG. 6 is a block diagram showing a conventional download data receiving system.

FIG. 7 is a block diagram showing a format of data transmitted in a conventional packet unit.

FIG. 8 is a block diagram showing a conventional digital broadcast download system.

[Explanation of symbols]

11: download data, 12: header information, 13:
Error detection information, 14: Program data, 15: Memory, 16: Error detection information, 17: Program data,
18 CPU, 19 nonvolatile memory, 21 packet, 22 CPU, 23 DRAM, 24 block
25: nonvolatile memory, 31: packet, 32: CP
U, 33 DRAM, 34 block, 35 nonvolatile memory, 41 packet, 42 header information, 43 error detection information, 44 program data, 45 DRA
M, 46 block, 47 block in another area, 48
... CPU, 49 ... Non-volatile memory, 51 ... Video data,
52 ... audio data, 53 ... data broadcasting data, 54 ...
Download data, 55 multiplexing unit, 56 program information, 57 transmission coding unit, 58 modulation unit, 61 demodulation unit, 62 separation unit, 63 arithmetic unit, 64 nonvolatile memory, 65 program Data, 66: video / audio processing unit, 67: video data, 68: audio data, 71: header, 72: data, 73: packet, 81: packet,
82 Data storage unit.

Claims (6)

[Claims] 1. A means for temporarily storing download data divided into packets and transmitted in a digital broadcast download system in a block unit having a size suitable for erasing and storing in a nonvolatile memory unit. And a means for storing download data stored in the memory means in a nonvolatile memory means in block units. 2. A digital broadcasting download system, comprising: an arithmetic processing unit for processing download data; a memory unit for temporarily storing download data; a non-volatile memory unit for storing the download data; Means for temporarily storing divided download data to be transmitted in a block unit having a size suitable for erasing and storing in the nonvolatile memory means and temporarily storing the downloaded data in the memory means; Means for determining a storage area in the nonvolatile memory means from the header information of
A digital broadcast download system, comprising means for storing download data temporarily stored in the memory means in block units in the nonvolatile memory means in block units in accordance with the determination result. 3. The digital broadcast download system according to claim 1, wherein said means for temporarily storing said download data in a memory means temporarily stores said download data in parallel with said memory means. Means for storing the download data in the non-volatile memory means in units of blocks in the nonvolatile memory means, wherein the download data of a plurality of blocks is collectively stored in the non-volatile memory means. Broadcast download system. 4. The digital broadcast download system according to claim 1, wherein the download data is transmitted from the download data or header information for transmitting the download data to the program data and the block unit or the plurality of packets. Means for temporarily storing the error detection information in the memory means and temporarily storing the program data in the memory means, and means for performing error detection of the program data for each block or for each of a plurality of packets using the error detection information. A digital broadcast download system, characterized in that: 5. The digital broadcast download system according to claim 4, wherein said error detection information is transmitted as one packet together with program data. 6. The digital broadcast download system according to claim 4, wherein the error detection information is transmitted as one packet of download data.