JP2010021717A - Software analysis system of digital broadcast receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To properly and quickly elucidate the cause of malfunction without increasing a recording capacity relating to causes of troubles. <P>SOLUTION: In step S201, a current write pointer position is preserved. In step S202, a write pointer is moved to an area of a write target. In step S203, it is determined whether the information storage area pointed by the pointer is empty. If it is empty, the process advances to step S204; but if it is not empty, the process advances to step S205. In the step S204, information is written into the area pointed by the write pointer. In step S205, priorities of information are compared. If the priority of overwrite information is higher, the process advances to the step S204; but if it is lower, the process advances to step S206. In the step S206, a pointer position is determined, and the process is terminated if the pointer position has not been moved. If it has been moved, the process advances to the step S202, and the write pointer is updated to a next information storage area. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a software analysis technique for a digital broadcast receiver, and more particularly to a technique for performing analysis for clarifying the occurrence condition and cause of the malfunction when a malfunction occurs in the digital broadcast receiver.

  In recent years, with the spread of digital broadcast receivers, operations using software in particular have become more complicated than conventional analog television receivers. That is, many digital broadcast receivers are equipped with large-scale software in order to perform hardware control, digital broadcast signal processing, and the like.

  These softwares tend to become larger and more complex due to the multi-functionality of digital broadcast receivers and the diversification of connections with external devices. As a result, even digital broadcasting receivers that have been fully inspected and tested may malfunction under rare conditions.If a malfunction occurs, the conditions and cause of the malfunction It is necessary to take prompt measures by clarifying. In order to analyze the occurrence condition and cause of the malfunction, it is useful to obtain, for example, a history (log) of device operation performed by the user, the state of the software module in the device, the state of the device, and the like. Therefore, a method for storing such information in a memory in digital broadcast reception has been considered.

  FIG. 10 is a diagram illustrating an example of a general malfunction information writing technique. As shown in FIG. 10, when information 1 to information n are sequentially written in all the memory areas (the left figure), the next information cannot be entered. Therefore, the latest information n + 1 is overwritten at the position of the oldest information at the position of the first information 1 (see the right figure).

  In the technique described in Patent Document 1 below, a digital broadcast receiver is provided with public line connection means and system software analysis means connected from the public line connection means via the public line, There is a disclosure relating to a system software analysis system for a digital broadcast receiver that allows the manufacturer to accurately grasp the state of the malfunction while the system is actually operating. In this document, management data such as a status flag for grasping the internal status is prepared in advance in the digital broadcast receiver, and the management data is uploaded via the connected public line. A technique for accurately grasping the situation of a malfunction occurring in the system is disclosed.

JP 2002-44692 A

  In order to analyze the occurrence conditions and causes of malfunctions, for example, the history of operations performed by the user, the state of internal software modules, the state of devices, etc. are necessary as described above. A method of storing in a memory in the receiver can be considered.

  However, the non-volatile memory is a finite resource, and it is desirable that it is less in consideration of the cost of the product. Therefore, it is common to save information necessary for analysis of malfunctions in time series and overwrite old information sequentially. However, with such a method, information that is really necessary for analysis may be overwritten. is there. In the simple method shown in FIG. 10, information 1 that may be important is overwritten.

  In addition, there is a method to save the information necessary for analysis for each type of malfunction by storing the nonvolatile memory area separately according to the type of malfunction, but it requires more nonvolatile memory, and there is a problem In such a case, there is a possibility that a useless memory area that is not used at all will be generated (the cost is increased accordingly).

  Further, as described in the above-mentioned Patent Document 1, recently, there is a digital broadcast receiver that can be connected to a network. In this case, there is a method in which information stored in the memory is transferred to a server or the like via a network and stored (a volatile memory may be used).

  However, when the information upload interval is short, when information is frequently written into the memory, or when the memory area is small, information necessary for analysis may be overwritten. For example, in the technique described in Patent Document 1, information necessary for analysis is periodically uploaded, but the information upload interval is long, the information writing to the memory is extremely large, or the memory area is small. In this case, the information necessary for analysis is overwritten, and when you want to know the cause of the problem, the information necessary for analysis disappears in the case of a malfunction with a large problem or malfunction with a low frequency of occurrence. There is also a fear.

  The present invention reliably saves information necessary for analysis of malfunctions with a large problem or low occurrence frequency without increasing the recording capacity related to the cause of the malfunction, and accurately and promptly identifies the cause of the malfunction. The purpose is to elucidate.

  According to one aspect of the present invention, a malfunction detection unit that detects malfunction of an electronic device, and a memory area for storing information about malfunctions detected by the malfunction detection unit in a plurality of storage areas in the order in which they occurred And an overwrite control unit that performs control when information related to the malfunction is overwritten on information described in any of the plurality of memory areas when a new malfunction is detected. A priority storage unit for storing priority determined to have higher priority for important information to be retained among the information written in the memory area, and the overwriting control; Only when the determination unit that determines whether or not the information has higher priority than the information that has already been written determines that the information has higher priority. Electronic apparatus and performing control to overwritten with new information is provided. Thereby, it is possible to preferentially rewrite only information with high priority. A time stamp indicating a malfunction occurrence time is stored in the memory area in association with the information, and when the same kind of malfunction occurs continuously due to the timestamp, the importance of the malfunction is increased. It is characterized by that. By this means, different types of information can be left as much as possible. It is preferable that the information stored in the priority storage unit is arranged with the priority corresponding to the information and arranged from the bottom in the new order of the information.

  The information stored in the priority storage unit is information having the lowest priority among the priorities of all the information, with the priorities associated with the information and rearranged in the order of higher priority. It is preferable to compare with information to be newly rewritten in order. Thereby, it is possible to search for the rewrite target quickly and easily.

  In addition, regarding the priority, a pointer for checking the priority indicating the position where the current priority is viewed is prepared when the overall priority is viewed by sequentially moving the information stored in the storage area. Using the priority confirmation pointer, the priority of the first information pointed to by the priority confirmation pointer and the second pointer pointed to by the write pointer indicating the position of the information currently being written When the priority of the second information is higher than that of the information, the position of the write pointer is moved to the position of the priority confirmation pointer, and the second information is more If the priority is not high, a process of performing the comparison after moving the position of the priority confirmation pointer to the next position without moving the position of the write pointer to the position of the priority confirmation pointer. Repeat It is preferred. Thereby, it is possible to determine whether or not the overwriting process based on the priority is necessary for the entire storage area, and to leave important information. The overwriting control unit preferably performs control to preferentially overwrite information having the same malfunction type.

  According to another aspect of the present invention, a malfunction detection unit that detects malfunction of an electronic device, and a memory for storing information about malfunctions detected by the malfunction detection unit in the order in which they occurred in a plurality of storage areas, respectively. An area and an overwrite control unit that performs control when overwriting the information described in any one of the plurality of memory areas when a new malfunction is detected, A method of rewriting a malfunction log in an electronic device having a step of storing a priority determined to have a higher priority as important information to be left out of information written in the memory area; and In the overwriting control unit, it is determined whether or not the information has higher priority than the information already written, and when it is determined that the information has higher priority. , Rewriting malfunction log, characterized in that and a step of performing control to overwrite existing information with new information is provided.

  The present invention may be a program for causing a computer to execute the method described above, or a computer-readable recording medium storing the program. The program may be acquired by a transmission medium such as the Internet.

  According to the present invention, there is an advantage that information necessary for analyzing a fatal malfunction or malfunction with a low occurrence frequency can be preferentially saved without increasing the memory capacity. As a result, it is possible to quickly elucidate the cause of the malfunction that is highly important in relation to the operation of the device, so that the satisfaction of the customer is improved and the burden on the service person is reduced.

  Hereinafter, a software analysis system for a television receiver according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a functional block diagram showing a configuration example of a digital broadcast receiver according to the present embodiment. As shown in FIG. 1, the television receiver A according to this embodiment includes an antenna 1, a digital broadcast receiver 3, a demultiplexer 5, a video / audio decoder 6, a screen synthesizer 8, and a display. Part 11 and an audio output part 15. Furthermore, it has the control part (CPU) 17 which controls the whole, the LAN interface 21, ROM23, RAM25, and the remote control light-receiving part 27.

  The digital broadcast receiving unit 3 selects an arbitrary broadcast wave from a plurality of broadcast waves received by the antenna 1 such as a satellite antenna or a terrestrial antenna and outputs the selected broadcast wave to the demultiplexer unit 5. The demultiplexer unit 5 selects a digital signal of an arbitrary channel from the plurality of channels included in the selected and input broadcast wave by demultiplex processing, and outputs the video and audio signals to the video / audio decoding unit 6 To do. The video / audio decoding unit 6 obtains a video / audio signal by decoding the digital signal of the selected channel, outputs the video signal to the screen synthesis unit 8, and outputs the audio signal to the audio output unit 15.

  The screen synthesizing unit 8 synthesizes the video signal of the program, the EPG screen, the reservation screen, and the like as necessary, and outputs them to the display unit 11. The display unit 11 is composed of a liquid crystal display or the like, and can display program images, various control screens, and the like. The audio output unit 15 includes an amplifier, a speaker, and the like, and can output program audio, warning sound, and the like.

  The control unit 17 receives an instruction (control signal) from a remote control device (not shown) via the remote control light receiving unit 27 and receives user operations such as channel selection, viewing reservation / recording reservation, and the like. The control unit 17 includes a malfunction detection unit 17a that detects malfunction or the like in hardware or software. The memories 23 and 25 include a volatile memory 25 such as DDR SDRAM and a nonvolatile memory 23. Information such as a malfunction detected by the malfunction detection unit 17a is stored in, for example, a table described below. Of the information written in the memory area of the non-volatile memory 23, the priority determined so that the important information to be retained has a higher priority is stored in the priority storage unit 23a. The overwriting control by the control unit 17 is determined by the determination unit 17b that determines whether the information has higher priority than information that has already been written, and only when it is determined that the information has higher priority. The existing information is overwritten with new information.

  FIG. 2 is a diagram illustrating a first configuration example of a malfunction log management table regarding malfunction according to the present embodiment. As shown in FIG. 2, the malfunction log management table according to the first configuration example is detected by the malfunction detection unit from information 1 to information n (n is an integer of 1 or more) as shown in the left figure. When the state stored in the log storage area of the memory (the state written in all areas) is stored (1 is the oldest information and n is the newest information), the next information is It is necessary to overwrite one of 1 to n. In FIG. 2, when information 1 to information n is stored together with the time stamp TS as an absolute time, the priority order with respect to information n + 1 that needs to be written next in order from information 1 that is the oldest information is Compare. Here, it is preferable to set a higher priority for information that should be retained (for example, information when a fatal malfunction occurs). As a result, only information having a higher priority than information already written can be overwritten in the area. In FIG. 2, information n + 1 <information 1, that is, information 1 is higher in priority than information n + 1, so that information 1 is not overwritten by information n + 1. For such determination, there are various methods. For example, a correspondence table corresponding to malfunction and the order of the fatal degree is separately stored in the memory, and at the time of priority comparison processing, The priority order may be determined by referring to the correspondence table. At this time, if the priorities are the same, they are overwritten with new information. This is because new information is considered more valuable. In this way, by comparing the priorities of the stored information from the oldest order, the information that is as old as possible and that has the lower priority or the same information as the information to be rewritten is the information to be rewritten. Can be selected. In this way, old information can be preferentially overwritten with the same priority, and can be quickly overwritten by comparing the priorities in order from the old information. Note that if the priority of information that is desired to be rewritten is lower than the current information, rewriting is not performed.

  In addition, when the time stamp indicating the occurrence time of the malfunction is stored in the memory area in correspondence with the information, for example, when it is determined by the time stamp that the same kind of malfunction occurred continuously, the malfunction Try to increase importance.

  It should be noted that as a trigger for storing information at the time of occurrence of malfunction, a malfunction symptom, an occurrence module (function) and the like are set, a priority is given to the contents, and this is managed as a table. Since this priority order management table is difficult to be deleted, it is desirable to store it in a nonvolatile memory. A specific example of the priority management table will be described later.

  Next, the malfunction log management table according to the second configuration example will be described with reference to FIG. As shown in FIG. 3, the table according to the second configuration example is preliminarily tabulated from the same state as FIG. 2 as shown in the left diagram in advance with the priority P corresponding to information as shown in the right diagram. The information is rearranged in the new order. In this state, the information having the lowest priority among the priorities of all the information (here, the third information 3 from the top has the lowest priority (n). Only the comparison is performed, so that the information 3 is left when the priority of the information 3 is higher, and the information 3 is overwritten with the information n + 1 when the priority of the information 3 is lower. For example, since the priority comparison process only needs to be performed once, there is an advantage that the process is simplified.Also in the following explanation, the numbers 1 to n in the information 1 to n in the right figure are the same. Are larger in the order of the new rewrites.

  Next, the malfunction log management table according to the third configuration example will be described with reference to FIG. As shown in FIG. 4, the table according to the third configuration example is preliminarily tabulated from the same state as FIG. 2 as shown in the left diagram in advance, with the priority P corresponding to information as shown in the right diagram, For example, they are rearranged from the top in order of priority. In this state, priority is given to information n + 1 in order from information having the lowest priority among all information priorities (here, information 7 as the lowest information is priority P = n). Only compare ranks. Thereby, when the priority is higher in the information 7, the information 7 is left, and when it is lower, the information 7 is overwritten with the information n + 1. In this way, since the low priority information is always present at the lowest (or upper) position, the comparison process regarding the information priority may be performed only once and the information to be compared. Since there is no need to search for the position, there is an advantage that the processing is further simplified.

  FIG. 5 is a diagram showing a specific example of the malfunction priority management table, and corresponds to the above table. As shown in FIG. 5A, the priority management table is a table in which actual malfunction symptoms are recorded in association with each other in order of priority. Symptoms in which video / audio is not output have the highest priority, followed by no response to remote control operation, ..., OSD flickering, and so on. As shown in FIG. 5B, a table for ranking by function may be used. In this figure, the priority is higher in the functions that are important for the television receiver, such as the priority level, the channel selection / reservation,... The ranking by this function indicates that each module is not in an original state, and in this embodiment, the prioritization by the function module as shown in FIG.

  FIG. 7 is a flowchart showing a flow of processing in which the malfunction detection unit 17a detects the occurrence of malfunction. First, in step S101, confirmation of whether or not the received broadcast is an actually broadcast program is executed by a process such as comparing the program information of the received program with the program information of the EPG. If it does not exist, the process proceeds to step S106, and the channel selection is terminated. Next, in step S102, it is confirmed whether PAT has been acquired. Here, a PAT (Program Association Table) describes a packet ID (PID) of a TS packet that transmits a PMT, which will be described later. PMT (Program Map Table) is one of the sections and is necessary information for digital broadcast tuning. More specifically, it is a PID of a TS packet that transmits each encoded signal constituting a program, and further a PID of a TS packet that transmits pay broadcast shared information.

  If the PAT cannot be acquired, the process proceeds to S106, and information to be actually written to the memory is created according to the malfunction, and the channel selection is terminated. PAT is one of the sections and is necessary information for digital broadcasting channel selection. Next, in step S103, it is confirmed whether the PMT has been acquired. If the PMT cannot be acquired, the process proceeds to S106, and information to be actually written to the memory is created according to the malfunction, and the channel selection is terminated. In step S104, it is confirmed whether the video / audio has been decoded. In step S104, the STEP for confirming the video / audio may be divided. If the video / audio cannot be decoded, the process proceeds to step S106, and information to be actually written to the memory is created according to the problem, and the channel selection is terminated. In step S105, it is confirmed whether the mute is canceled and video / audio is output. The step of confirming the video and audio may be divided into each. If mute cannot be released, the process proceeds to step S106, and the channel selection is terminated. Next, in step S106, information to be actually written in the memory is created in accordance with the malfunction that has occurred in each STEP. A subsequent sequence when the channel selection ends abnormally and a malfunction is detected will be described below.

  FIG. 8 is a flowchart showing a flow of processing for writing information relating to a malfunction when a malfunction occurs, and illustrates an example of a method of writing by the latest priority comparison (see FIG. 2). First, in step S201, the current write pointer position is saved. The position of the information currently being changed can be known from the position of the write pointer. Further, by changing the position of the write pointer, the position of information to be written can be changed. Since there is a case where an area to be written does not exist, it is used as an end condition at that time (to be used for pointer comparison in step S206). Next, in step S202, the write pointer is moved to the write target area. Next, in step S203, it is determined whether or not the information storage area pointed to by the pointer is empty. If the information storage area is empty, the process proceeds to step S204 and information is written. When the information storage area is not empty (when information needs to be overwritten), the process proceeds to step S205. In step S204, information is written in the area pointed to by the write pointer (write from RAM to ROM). Next, in step S205, the priority of the information to be written is compared with the information already written in the area. When the priority of the information to be written is equal to or higher than the priority of the information already written, the process proceeds to S204 and the information is written. When the priority of the information to be written is lower than the priority of the information already written, the process proceeds to step S206. In step S206, it is determined whether the write pointer position saved in step S201 is the same as the current write pointer position. If the pointer positions are the same, it means that there is no area that can be written even if the information storage area goes around. Therefore, the information to be written is discarded (without overwriting) and the process is terminated. If the pointer positions are not the same, the process proceeds to step S202, the write pointer is updated to the next information storage area, and the process according to the same flowchart is executed again.

  By comparing the latest priorities by the above processing, there is an advantage that it is not necessary to increase the memory capacity while always storing high priority information according to the information priorities.

  Next, an information writing method at the time of malfunction according to another embodiment of the present invention will be described with reference to FIG. This method is a method of writing information by comparing the priorities of the whole, and is a method corresponding to the writing position and the priority in the same manner as shown in FIG. Here, for example, a priority confirmation pointer indicating a position where the current priority is viewed when the overall priority is viewed by moving from the top position to the bottom position in FIG. And using this priority confirmation pointer, the information overwrite position is specified by the steps shown in FIG. 9 below. For example, in FIG. 3, the priority confirmation pointer is sequentially moved from the top to the bottom, so that the priority of the position indicated by the pointer can be known. As will be described below, the write position pointer moves as the priority confirmation pointer moves, and when it reaches the overwrite position, information is overwritten at that position.

  More specifically, first, in step S301, the priority confirmation pointer (different from the write pointer) and the write pointer are set to the first area of the log storage area (for example, at the top of the right diagram in FIG. 3). Next, in step S302, the priority of the information pointed to by the priority confirmation pointer is compared with the priority of the information pointed to by the write pointer. If the priority of the information pointed to by the write pointer is higher than the priority of the information pointed to by the priority confirmation pointer, the process proceeds to step S303. If the priority of the information pointed to by the write pointer is lower than or the same as the priority of the information pointed to by the priority confirmation pointer, the process proceeds to step S304. Here, since the priorities of the two are the same position and are naturally the same (for example, the priority is 1), the determination is no, the process proceeds to step S304, and it is determined whether or not it is the end of the area. In the case of the last of the area, the process proceeds to step S306. Here, since the beginning is not the end of the area, the process proceeds to step S305. In step S305, the position of the priority confirmation pointer is advanced (updated) to the next area (information 2 position). Here, in step S302, the priority of the information pointed to by the priority confirmation pointer is compared with the priority of the information pointed to by the write pointer. In this case, since the priority level is 3 and the priority level 1 is Yes in step S302, the position of the write pointer is moved to the position of the priority confirmation pointer, that is, the position of information 2 in step S303. Even at this position, the priority in step S302 is the same, and thus No, and if it is not the last area, the priority confirmation pointer is moved to the next lower information 3, and the write pointer remains information 2. is there. Here, since the priority of the information 3 is n, it becomes Yes in step S302, and the write pointer moves to the position of the information 3. Furthermore, even if the priority confirmation pointer is continuously moved to the position of information 4 in step S305, the determination step in step S302 is No until the end. Therefore, the process proceeds to step S304, and further proceeds to step S306, whereby the log information (n + 1) to be written is overwritten and stored at the position of the write pointer (here, the third position from the top, which is information 3).

  As described above, by using two different pointers, that is, the write pointer and the priority confirmation pointer, the priority of the information pointed to by the write pointer is higher or lower than the priority of the information pointed to by the priority confirmation pointer. If the former is high, the write pointer is updated to the position of the area. Otherwise, the write pointer is not updated to the position of the area, and the position of the priority confirmation pointer is updated to the next area. By performing the process to the end of the area, it is possible to perform the process of overwriting the information to be rewritten on the information with a low priority while viewing the priority of the area.

  FIG. 6 is a diagram specifically showing a modification of information writing to the information storage area. The position of the writing area is managed by the writing pointer indicated by the arrow. Further, in order to grasp the time relationship of each information (because the information is not necessarily arranged in time series), the written time (TS: time stamp) is recorded for each information. TS may be absolute or relative time. In order from the top, information 1 (channel selection) is not overwritten by information other than information (channel selection). Information 2 (channel selection) is not overwritten by information other than information (channel selection). Information 3 (Internet) is not overwritten by information other than information (Internet). Information 6 (reservation) is not overwritten on information other than information (reservation). In this way, even if different types of information are entered at the position of the write pointer, this area is not overwritten. In this way, depending on whether the information type is the same or not, if the malfunction information type is not the same, it is possible to log different types of defects as equally as possible by not overwriting regardless of the priority. Can be left as. Note that the type of malfunction information may be different for each function of the television receiver, and similar functions are collectively the same type (the same type is used because viewing reservation and recording reservation are the same reservation process). Etc.).

  As described above, by preferentially leaving more important information, more important information can be left as a log without increasing the memory capacity. A service person can quickly provide a service to the user by acquiring a flash memory or the like storing the log using a memory card or via a network.

  In the above-described embodiment, the configuration and the like illustrated in the accompanying drawings are not limited to these, and can be changed as appropriate within the scope of the effects of the present invention. In addition, various modifications can be made without departing from the scope of the object of the present invention.

  In addition, a program for realizing the functions described in the present embodiment is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into a computer system and executed to execute processing of each unit. May be performed. The “computer system” here includes an OS and hardware such as peripheral devices.

  Further, the “computer system” includes a homepage providing environment (or display environment) if a WWW system is used.

  The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Furthermore, the “computer-readable recording medium” dynamically holds a program for a short time, like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, a volatile memory in a computer system serving as a server or a client in that case is also used to hold a program for a certain period of time. The program may be a program for realizing a part of the above-described functions, or may be a program that can realize the above-described functions in combination with a program already recorded in a computer system.

  Furthermore, in the present embodiment, a general television receiver has been described as an example of a digital television receiver. However, in addition, a DVD recorder, an HDD recorder, a PC, and the like are used for digital television reception. Needless to say, a device equipped with a tuner also falls within the scope of the present invention.

  The present invention can be used for software analysis of a television receiver.

It is a functional block diagram which shows one structural example of the digital broadcast receiver by one embodiment of this invention. It is a figure which shows the 1st structural example of the malfunction log management table regarding the malfunction by this Embodiment. It is a figure which shows the 2nd structural example of the malfunction log management table regarding the malfunction by this Embodiment. It is a figure which shows the 3rd structural example of the malfunction log management table regarding the malfunction by this Embodiment. It is a figure which shows the specific example of the priority management table of malfunction, and is a figure corresponding to said table. It is a figure which shows specifically the modification of the information writing to an information storage area. It is a flowchart figure which shows the flow of the process in which a malfunction detection part detects generation | occurrence | production of malfunction. It is a flowchart figure which shows the flow of the process which writes the information regarding malfunctioning at the time of malfunctioning, and is the figure which illustrated the method (refer FIG. 2) which writes by the latest priority comparison. FIG. 12 is a flowchart showing a method of writing information in a malfunction according to another embodiment of the present invention, and writing information by overall priority comparison. It is a figure which shows an example of the general technique of writing malfunction information.

Explanation of symbols

A ... TV receiver, 1 ... antenna, 3 ... digital broadcast receiving unit, 5 ... demultiplexer, 6 ... video / audio decoding unit, 8 ... screen synthesis unit, 11 ... display unit, 15 ... audio output unit, 17 ... Control unit (CPU), 17a ... malfunction detection unit, 17b ... determination unit, 21 ... LAN interface, 23 ... ROM, 23a ... priority storage unit, 25 ... RAM, 27 ... remote control light receiving unit.

Claims (9)

A malfunction detection unit for detecting malfunction of the electronic device, a memory area for storing information on malfunctions detected by the malfunction detection unit in a plurality of storage areas in the order of occurrence, and a new malfunction were detected In this case, an electronic device having an overwriting control unit that performs control when overwriting information on the malfunction described in any of the plurality of memory areas,
Furthermore, a priority storage unit that stores priority determined to have higher priority for important information to be left out of the information written in the memory area,
The overwriting control unit determines whether the information has higher priority than information that has already been written. Only when the determination unit determines that the information has higher priority, the overwrite control unit An electronic device characterized by performing control to overwrite with new information.   The electronic device according to claim 1, wherein the information stored in the priority storage unit is arranged with a priority corresponding to the information and arranged from the bottom in a new order of the information.   The information stored in the priority storage unit is information having the lowest priority among the priorities of all the information, with the priorities associated with the information and rearranged in the order of higher priority. The electronic device according to claim 1, wherein the electronic device is compared with information to be newly rewritten in order.   Regarding priority, a priority confirmation pointer indicating a position at which the current priority is viewed when preparing the overall priority by sequentially moving the information stored in the storage area is prepared, Using the priority confirmation pointer, the priority of the first information indicated by the priority confirmation pointer, the second information indicated by the write pointer indicating the position of the information currently being written, If the second information has a higher priority, the position of the write pointer is moved to the position of the priority confirmation pointer, and the second information has a higher priority. If the position is not high, the comparison processing is repeated after the position of the priority confirmation pointer is moved to the next position without moving the position of the write pointer to the position of the priority confirmation pointer. Special Electronic device according to any one of claims 1 to 3,.   5. The electronic device according to claim 1, wherein the overwriting control unit performs control to preferentially overwrite information having the same type of malfunction. 6.   A time stamp indicating a malfunction occurrence time is stored in the memory area in association with the information, and when the same kind of malfunction occurs continuously due to the timestamp, the priority of the malfunction is increased. The electronic device according to claim 1, wherein the electronic device is an electronic device. A malfunction detection unit that detects malfunction of an electronic device, a memory area for storing information on malfunctions detected by the malfunction detection unit in the order of occurrence in a plurality of storage areas, and a new malfunction were detected A malfunction log rewriting method in an electronic device comprising: an overwriting control unit that performs control when overwriting information related to the malfunction in any of the plurality of memory areas. There,
Storing priority determined to have higher priority for important information to be left out of the information written in the memory area;
In the overwriting control unit, it is determined whether or not the information has higher priority than information that has already been written. Only when it is determined that the information has higher priority, the existing information is replaced with new information. And a method of rewriting the malfunction log, characterized by comprising the step of performing overwriting control.   A program for causing a computer to execute the method according to claim 7.   A computer-readable recording medium storing the program according to claim 8.

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