JP2008293553A - Content reproduction device, content reproduction method and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a content reproduction device which continues operation even when a DSP fails, and to provide a content reproduction method and a program. <P>SOLUTION: In accordance with a processing state of the DSP 10 changed by a control of a system microcomputer 1, values of information of selector selection and of operating state of a selector which have been stored in a RAM 1b are updated, and when the DSP 10 is determined to be faulty, the information showing the abnormal state of the DSP 10 is stored in the RAM 1b. When the information showing the abnormal state of the DSP 10 is being stored in the RAM 1b after the DSP 10 is reset, operation of the DSP 10 is started based on the information of the selection state and operating state of the selector of the DSP 10 stored in the RAM 1b. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a content reproduction apparatus, a content reproduction method, and a program for performing communication and processing among a plurality of control means.

  Content control such as audio equipment that can switch between multiple selectors such as tuner, CD (Compact Disk), external input, etc. with system microcomputer and DSP (Digital Signal Processor) as two control means in the relationship between master and slave Equipment is widespread.

  In such a content playback apparatus, the system microcomputer controls an analog input selector for selecting an analog input signal such as a tuner or CD, or a USB (Universal Serial Bus) flash memory or an ADC (Analog Digital Converter). Various controls such as a control for selecting a digital input signal to be input to the DSP is performed. The DSP selects a digital signal input to itself and outputs a digital signal obtained by applying various acoustic effects such as equalizing to the input digital signal. Furthermore, the DSP can play back audio compression files recorded in an external memory such as a USB flash memory or an SD (Secure Digital) memory card. The selector is controlled by a system microcomputer. In the control process as described above, various control signals are communicated between the system microcomputer and the DSP.

  In addition, when a part of the content playback unit, DSP, or other parts of the IC (Integrated Circuit) is turned off or runaway due to some sudden factors such as lightning or static electricity, The microcomputer or DSP may be forcibly reset. If the system microcomputer is reset, the operations that each part in the content playback device used to stop may stop, but the content playback device is in an abnormal state because everything is restarted. There is no such thing as falling into

  FIG. 10 shows a DSP control routine performed by the system microcomputer of the conventional content reproduction apparatus.

  First, after the content playback apparatus is powered on, after a set time of a timer for waiting until the power supply is stabilized (step S101), the DSP reset is released and the DSP is activated (step S102). ).

  Next, after a set time of a timer for waiting until the DSP operation is stabilized (step S103), a communication start-up process between the system microcomputer and the DSP is started, and the process is completed after a predetermined time has elapsed. If not, an error timer for notifying an error is set (step S104).

  Next, when the set time of the error timer elapses before the communication start-up process in step S104 is completed (step S105; Yes), the DSP is reset (step S106), and the process proceeds to step S102.

  If the communication startup process is completed before the set time of the error timer has elapsed (step S107; Yes), DSP initial setting data such as equalizer settings is transmitted to the DSP (step S108).

  Next, communication of control signals is performed between the system microcomputer and the DSP until the content playback apparatus is requested to power off (step S109), and the DSP operates normally (step S110).

  Next, in the communication performed in step S110, a communication error occurred because the DSP suddenly entered an abnormal state due to some factor (for example, static electricity, circuit problem, mechanical problem, chip property, etc.). If so (step S111; Yes), the counter value (n) for counting the number of errors is incremented by one (step S112). If no communication error occurs (step S111; No), the counter value is set to 0 (step S113), and the process proceeds to step S109.

  Next, after step S112, if the value of the counter is within the preset allowable error count (step S114; Yes), the process proceeds to step S109 to retry the communication in which the communication error has occurred in step S111. . If the allowable error count is exceeded (step S114; No), the DSP is reset (step S115), and the process proceeds to step S102.

  Here, the allowable error number is a threshold value of the communication error number for resetting the DSP when communication errors frequently occur in communication between the system microcomputer and the DSP. A preset value is stored in a memory such as a RAM (Random Access Memory).

  If there is a request for power off of the content reproduction apparatus (step S109; Yes), the DSP shutdown process is performed, and the DSP control routine executed by the system microcomputer ends.

  As described above, even in the case where a communication error frequently occurs due to the DSP being in an abnormal state or the like in the conventional content reproduction apparatus, the DSP is reset and the initial setting is performed between the system microcomputer and the DSP. Communication resumes.

  Further, for some reason, the DSP may suddenly fall into an abnormal state where the system microcomputer is not reset and only the DSP is reset against the control of the system microcomputer or runs away. In such a case, even if a communication error occurs between the system microcomputer and the DSP, communication may be retried thereafter, so that communication may be resumed.

In addition, as an example of a technique for controlling a DSP by a CPU (Central Processing Unit), Patent Document 1 discloses a technique that enables a large DSP program to be executed even if the DSP has a small program area.
Japanese Patent Laid-Open No. 2000-40028

  However, in the above prior art, when the communication between the system microcomputer and the DSP is resumed after the DSP enters the abnormal state, the setting of the DSP is the initial setting, etc. Since the settings are different, there is a mismatch between the settings of the system microcomputer and the DSP, causing the problem that the operation of the content playback device falls into an abnormal state, the content playback stops, and no sound is produced.

  An object of the present invention is to provide a content reproduction apparatus, a content reproduction method, and a program capable of continuing operation even when the DSP is in an abnormal state.

The invention according to claim 1 is a content playback apparatus,
First control means;
Second control means controlled by the first control means;
Memory,
With
The first control means stores the result of controlling the second control means in the memory as processing status information of the second control means, and the second control means The state is determined, and when the second control means determines that the state is abnormal based on the determined state and the state information stored in the memory, the state information stored in the memory is initialized. And restarting the second control means.

According to a second aspect of the present invention, in the content reproduction device according to the first aspect,
The restart of the second control means performed by the first control means is performed using the state information stored in the memory immediately before the restart as an initial setting.

The invention according to claim 3 is the content playback apparatus according to claim 1 or 2,
The state information stored in the memory includes selector selection state information that is information relating to the type of content data input to the second control means.

According to a fourth aspect of the present invention, in the content reproduction device according to any one of the first to third aspects,
The state information stored in the memory includes operation state information that is information related to an operation state of the content reproduction apparatus.

The invention according to claim 5 is the content playback apparatus according to claim 4,
The second control means continuously reproduces a plurality of contents, records the reproduced contents for each content,
The first control unit restarts the second control unit when the second control unit determines that the second control unit is in an abnormal state while the content is being recorded, and then the memory Resuming recording of the content that was being recorded based on the selector selection state information and the operation state information stored in
It is characterized by.

The invention according to claim 6 is a content playback method,
A first control step;
A second control step controlled by the first control step;
Memory process;
With
The first control step stores the result of controlling the second control step as state information of the process of the second control step by the storage step, and the process currently being performed by the second control step If the second control step is determined to be abnormal based on the determined state and the state information stored by the storage step, the state information stored by the storage step The second control step is restarted with the initial setting.

The invention according to claim 7 is a program,
A first control means,
Second control means controlled by the first control means;
Storage means,
Function as
The first control means stores the result of controlling the second control means in the storage means as processing status information of the second control means, and the process currently being performed by the second control means If the second control unit determines that the second control unit is in an abnormal state based on the determined state and the state information stored in the storage unit, the state information stored in the storage unit And restarting the second control means.

  According to the present invention, it is possible to provide a content reproduction apparatus, a content reproduction method, and a program that can continue operation even when the DSP is in an abnormal state.

  Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings. However, the scope of the invention is not limited to this embodiment.

[Constitution]
First, the configuration of the content reproduction apparatus will be described.
As shown in FIG. 1, a content playback apparatus 100 is a content playback apparatus such as a portable audio device, a home audio device, and a car audio device that can view content such as audio content.

  As shown in FIG. 1, the content playback apparatus 100 includes a system microcomputer 1, a tuner unit 2, a storage unit 3, an SD memory card slot 4, a USB connector 5, an analog audio input unit 6, a CD mechanism unit 7, and an analog signal selector 8. , ADC 9, DSP 10, DAC (Digital Analog Converter) 11, amplifier unit 12, speaker 13, display unit 14, and operation unit 15.

  A system microcomputer 1 serving as a first control unit includes a ROM (Read Only Memory) 1a and a RAM 1b, reads out a control program and various data from the ROM 1a and the like, develops them in the RAM 1b, and cooperates with the program in the audio device 1. Each part is controlled centrally and various calculations are performed.

  The tuner unit 2 is a circuit that outputs a carrier broadcast radio wave such as radio or television received via the antenna 18 as an audio signal.

  As the storage unit 3, an HDD (Hard Disk Drive) or the like is used. The storage unit 3 stores content data that can be played back by the content playback apparatus 100 in the form of a compressed audio file such as MP3 or WMA.

  The SD memory card slot 4 is a slot for connecting an SD memory card 16 as an external memory.

  The USB connector 5 is a connection connector such as a USB flash memory 17 as an external memory.

  The analog audio input unit 6 is an input unit that inputs an analog audio signal output from an external device (not shown).

  The CD mechanical unit 7 is a device such as a CD drive, and reads content data recorded on a CD and outputs it to the analog signal selector 8 or the DSP 10.

  The analog signal selector 8 is a circuit that selects the type of content data to be reproduced by the content reproduction apparatus 100. The source selection is switched according to the control signal input from the system microcomputer 1.

  The ADC 9 is an A / D conversion circuit that converts an input analog signal into a digital signal and outputs the digital signal.

  The DSP 10 as the second control unit includes an encoder 10a and a decoder 10b. The encoder 10a encodes the digital signal output from the CD mechanical unit 7 or the ADC 9 to create a compressed audio file, and stores this file in a storage unit such as the storage unit 3. That is, by storing the file in the storage unit, the audio digital signal output from the CD mechanism unit 7 or the like is recorded as a file. The decoder 10b decodes a compressed audio file or the like input from the storage unit 3, the SD memory card slot 4, or the USB connector 5, performs reproduction processing, and outputs a digital signal. The DSP 10 functions as a selector for selecting the type of input digital signal (content data), and as a digital filter that outputs various digital effects such as equalizing to the input digital signal and outputs the digital signal. It has the function of.

  The DAC 11 is a D / A conversion circuit that converts a digital signal output from the DSP 10 into an analog signal and outputs the analog signal.

  The amplifier unit 12 is a circuit that amplifies an analog signal output from the DAC 11 and outputs the amplified analog signal to the speaker 13.

  The speaker 13 is a device that outputs an analog signal output from the amplifier unit 12 as a sound wave.

  The display unit 14 displays various information such as operation mode information and song information of the content reproduction apparatus 100.

  The operation unit 15 is an apparatus provided with various operation keys, and outputs an operation signal to the system microcomputer 1 in response to an operation key operation by a user of the content reproduction apparatus 100.

  FIG. 2 shows a list of values stored in the RAM 1 b as parameters for selecting an input signal input from the system microcomputer 1 to the DSP 10. One of the parameter values is stored in the RAM 1b by the system microcomputer 1 in accordance with the selector selected during the operation of the content reproduction apparatus 100, and the system microcomputer 1 performs processing according to the parameter value.

  The set value 21 indicates a parameter stored in the RAM 1b. The setting content 22 indicates the setting content corresponding to each parameter. The selector state 23 indicates the selection state of the selector corresponding to the setting content 22.

  For example, when the setting value 21 is “00 (default)”, the setting content 22 is “ADC IN”, and the selector state 23 is tuner, AUX (Auxiliary) (analog input unit), or CD analog.

  FIG. 3 shows a list of parameters for selecting a selector in the DSP 10. During the operation of the content reproduction apparatus 100, any parameter selected by the system microcomputer 1 is stored in the RAM 1b, and the DSP 10 performs processing according to the parameter and functions as a selector.

  The set value 31 indicates a parameter stored in the RAM 1b. The setting content 32 indicates the setting content corresponding to each parameter. The selector state 33 indicates the selection state of the selector corresponding to the setting content 32.

  For example, when the setting value 31 is “0F (default)”, the setting content 32 is “DSP_AUX”, and the selector state 33 is tuner, AUX (analog input unit), CD analog, or CD digital.

  FIG. 4 shows a correspondence table of setting values of input signal selection and DSP internal selector selection for each state of the selected selector.

  The selector state 41 indicates the state of the selected selector. The input signal setting 42 indicates a setting value and setting content of input signal selection corresponding to the state of the selected selector. The DSP internal selector setting 43 indicates a setting value and setting contents of DSP internal selector selection corresponding to the state of the selected selector.

  For example, when the radio is being played by the content playback apparatus 100 and the selector state 41 is tuner, the input signal setting 42 is “00 (ADC IN)” and the DSP internal selector setting 43 is “0F (DSP_AUX)”. ".

[Operation]
Next, the operation of the content reproduction apparatus 100 will be described.
5 and 6 show a control routine of the DSP 10 performed by the system microcomputer 1.

  First, as shown in FIG. 5, after the content reproduction apparatus 100 is powered on, a timer for waiting until the power supply is stabilized has elapsed (step S51), and then the reset of the DSP 10 is released and the DSP 10 is activated. (Step S52).

  Next, after a timer for waiting until the operation of the DSP 10 is stabilized (step S53), a communication start-up process between the system microcomputer 1 and the DSP 10 is started, and the process is completed after a predetermined time has elapsed. If not, an error timer for notifying an error is set (step S54).

  Next, when the time set in the error timer elapses before the communication start-up process in step S54 is completed (step S55; Yes), information indicating that the DSP 10 is in an abnormal state is stored in the RAM 1b, and the DSP 10 Reset is performed (step S56), and the process proceeds to step S52.

  If the communication start-up process is completed before the time set in the error timer has elapsed (step S55; No, step S57; Yes), the process proceeds to step S58.

  Next, when information indicating that the DSP 10 is in an abnormal state is stored in the RAM 1b, that is, when the DSP 10 is reset and activated in step S52 because the DSP 10 is in an abnormal state (step S58; Yes), Information on selection of the internal selector of the DSP 10 and information on the operating state of the content reproduction apparatus 100 stored in the RAM 1b immediately before the reset of the DSP 10 are transmitted to the DSP 10 as initial settings in a later-described step (step S59). Then, the DSP 10 is initialized in a state corresponding to the transmitted information, and the process proceeds to step S61 in FIG.

  Further, when information indicating that the DSP 10 is in an abnormal state is not stored in the RAM 1b, that is, when the DSP 10 is reset based on normal operation and started in step S52 (step S58; No), the DSP 10 As default settings, predetermined data is transmitted to the DSP 10 (step S60). Then, the operation of the DSP 10 is started based on the transmitted data, and the process proceeds to step S61 in FIG.

  Next, as shown in FIG. 6, communication of control signals is performed between the system microcomputer 1 and the DSP 10 until the content playback apparatus 100 is requested to power off (step S61), and the DSP 10 is normally operated. (Step S62).

  Next, when the state of the DSP 10 is in a state contrary to the control of the system microcomputer 1 (step S63; Yes), information indicating that the DSP 10 is in an abnormal state is stored in the RAM 1b, and the DSP 10 is reset (step S64). The process proceeds to step S52.

  Here, “the state of the DSP 10 is in a state contrary to the control of the system microcomputer 1” means that the selection state of the selector of the DSP 10 suddenly changes regardless of the control by the system microcomputer 1, or the content playback apparatus When the operation state of 100 suddenly changes to another state (for example, when the stop state has suddenly changed to the playback state, the next content is suddenly played back even though the playback of one content has not ended) If you started.) The DSP 10 is suddenly reset by some factor such as static electricity, and the state of the DSP 10 changes to the default state. Even if the reset is not performed, the DSP 10 may be in a state contrary to the control of the system microcomputer 1 due to a malfunction.

  In the communication in step S62, information on the processing state such as the current selector selection state of the DSP 10 is constantly transmitted from the DSP 10 to the system microcomputer 1, and the system microcomputer 1 is based on the received information. In step S63, it is determined whether or not the state of the DSP 10 is in a state contrary to the control of the system microcomputer 1.

  For example, when the selector selection state is CD (digital), as shown in FIG. 4, the values of the input signal setting 42 and the DSP internal selector setting 43 stored in the RAM 1b are “01 (CD IN)”, respectively. , “0F (DSP_AUX)”. At this time, if the DSP 10 is suddenly reset against the control of the system microcomputer 1, the selection state of the selector of the DSP 10 is the default tuner state (the input signal setting 42 is “00 (ADC IN)”). , The DSP internal selector setting 43 changes to “0F (DSP_AUX)”). When the information on the state after the transition is transmitted from the DSP 10 to the system microcomputer 1, the state of the DSP 10 is determined based on the input signal setting 42 and the value of the DSP internal selector setting 43 stored in the RAM 1b by the system microcomputer 1. It is determined that the system is in a state contrary to the control of the system microcomputer 1. Further, as will be described later, even when communication between the system microcomputer 1 and the DSP 10 cannot be performed normally, it is determined that the state of the DSP 10 is in a state contrary to the control of the system microcomputer 1.

  Further, when the state of the DSP 10 does not violate the control of the system microcomputer 1 (step S63; No), the information of the internal selector selection of the DSP 10 stored in the RAM 1b is shown in accordance with the state of the currently selected selector. 3 is updated to any one of the set values 31, and the operation state information stored in the RAM 1 b is further changed according to the current operation state (for example, reproduction state, stop state, etc.) of the content reproduction apparatus 100. The value is updated (step S65). That is, according to the processing state of the DSP 10 changed by the control by the system microcomputer 1, the selector selection information and the operation state information values stored in the RAM 1b are updated.

  If the DSP 10 is reset and restarted after updating the internal selector selection information and the operation state information of the DSP 10 in this step, the updated information is stored in the last step S DSP 59 before the DSP 10 is reset. The information is transmitted to the DSP 10 as state information, and the DSP 10 is initialized in a state corresponding to the information. The same applies to the operation state information updated in step S67 described later.

  FIG. 7 shows a list of examples of types of operation state information of the content reproduction apparatus 100 updated in step S65. The operation status information includes “STOP” indicating that the content playback is stopped, “PLAY” indicating that the content is being played back, and content playback being paused. "PAUSE" indicating that the feed is being forwarded, "FF being active" indicating that feedback is being performed, "FB being active" indicating that feedback is being performed, and SD when the selection state of the selector is an SD memory card or SUB flash memory. “No MEDIA (SD / USB)” indicating that media such as a memory card is not connected to the connection port such as the SD memory card slot 4, and files stored in the SD memory card or USB flash memory are analyzed. "File analysis in progress (SD / USB)" to indicate that the USB flash memory is US “USB connected” indicating that it is connected to the B connector 5, “Accessing (SD / USB)” indicating that a file stored in the SD memory card or USB flash memory is being accessed, There is information such as “recording” indicating that the sound is being recorded.

  Although not shown, when the selection state of the selector is CD, SD memory card, or SUB flash memory, the file number of the currently reproduced file, the track number of the track, the reproduction point (current reproduction time) Information and the like are also stored in the RAM 1b as operation state information.

  Next, after step S65, when the currently selected selector is an SD memory card or a USB flash memory (step S66; Yes), the operation state information such as the current reproduction file number and reproduction point stored in the RAM 1b. Is updated (step S67).

  If the currently selected selector is not an SD memory card or USB flash memory (step S66; No), the process proceeds to step S68.

  Next, when a communication error occurs in the communication between the system microcomputer 1 and the DSP 10 (step S68; Yes), the value of the counter that counts the number of errors is incremented by one (step S69). If no communication error has occurred (step S68; No), the counter value of the number of errors is cleared to 0 (step S70), and the process proceeds to step S61.

  Next, after step S69, when the error number counter is within the preset allowable error number (step S71; Yes), the communication determined to have a communication error in step S68 is retried (step S71). S73), the process proceeds to step S61.

  If the error count counter exceeds the preset allowable error count (step S71; No), information indicating that the DSP 10 is in an abnormal state is stored in the RAM 1b, and the DSP 10 is reset (step S72). ), And proceeds to step S52.

  If there is a request for power off of the content reproduction apparatus (step S61; Yes), the DSP 10 is shut down, and the control routine of the DSP 10 performed by the system microcomputer 1 ends.

  As described above, the selector selection information and the operation state information stored in the RAM 1b are updated in accordance with the processing state of the DSP 10 changed by the control by the system microcomputer 1, and it is determined that the DSP 10 is in an abnormal state. (For example, when the communication startup process between the system microcomputer 1 and the DSP 10 is not completed within a predetermined time set by the timer, or the DSP 10 is in a state contrary to the control of the system microcomputer 1 during the operation of the DSP 10. If the communication error occurs more than a predetermined number of times during communication between the system microcomputer 1 and the DSP 10, information indicating that the DSP 10 is in an abnormal state is stored in the RAM 1b, and the DSP 10 is reset. After that, information indicating that the DSP 10 is in an abnormal state is stored in the RAM 1b. If it is the operation of the DSP10 based on the information of the selected state and the operating state of the selector DSP10 which immediately before the reset is stored in the aforementioned RAM1b it is initiated.

  Therefore, even when the DSP 10 is suddenly reset for some reason, or even when the system microcomputer 1 determines that the DSP 10 has entered an abnormal state and is reset, the operation of the content playback device 100 such as playback continues. can do.

[Other embodiments]
Next, as another embodiment, in FIG. 8 and FIG. 9, when the DSP 10 is reset against the control by the system microcomputer 1 while recording the reproduced content in the storage unit such as the storage unit 3 or the USB flash memory 17. An example of

  FIG. 8 shows a disc configuration example of a CD 70 in which content to be recorded is stored. The CD 70 stores contents in which the track No. 71 is “Track 1”, “Track 2”, and “Track 3” and the song title 72 is “AAA”, “BBB”, and “CCC”, respectively.

  FIG. 9 shows a case where the DSP 10 is reset against the control by the system microcomputer 1 while recording a plurality of contents stored in the CD 70 continuously played by the DSP 10 as compressed audio files in the storage unit 3 for each content. The control routine of the system microcomputer 1 is shown. The content to be stored may be other content other than that stored on the CD, and the recording destination of the content may be another storage unit such as the SD memory card 16 or the USB flash memory 17.

  This control routine starts when the system microcomputer 1 receives a control signal for requesting recording of the content of the CD 70 set in the CD mechanical unit 7 from the outside.

  First, it stands by in a state of being paused at the beginning of the track 1 of the CD 70 (step S81), and preparation for recording processing by the DSP 10 is performed (step S82).

  Next, the recording process for track 1 is started, a file for storing the recorded data is opened by the DSP 10, and reproduction of track 1 is started (step S83).

  Next, the recording is finished after the reproduction of the track 1 is finished, and when the reproduction of the track 1 is finished, the recording is paused, and the file storing the recorded data is closed (step S84).

  Next, the recording process of the track 2 is started, a new file for storing the recorded data is opened by the DSP 10, and the reproduction of the track 2 is started (step S85).

  Next, when the DSP 10 is forcibly reset due to external factors such as static electricity and the state of the DSP 10 suddenly becomes the default state, it is determined that the state of the DSP 10 is in a state contrary to the control of the system microcomputer 1. Then, information indicating that the DSP 10 is in an abnormal state is stored in the RAM 1b, and the DSP 10 is reset (step S86). The method for determining whether or not the DSP 10 is in a state contrary to the control of the system microcomputer 1 is the same as the method in step S63 in FIG.

  Next, the input signal setting information (in this embodiment, “00 (ADC IN)” or “01 (CD IN)”) stored in the RAM 1b as information on the last state before the forced reset of the DSP 10, the inside of the DSP Selector setting information (in this embodiment, “0F (DSP_AUX)”), operation state information (in this embodiment, “recording”), track No. information of the currently played song (in this embodiment, “ The track 2 ") etc. is transmitted to the DSP 10 as an initial setting. Then, the DSP 10 is initialized based on the transmitted information. (Step S87).

  Next, it stands by in a state of being paused at the beginning of the track 2 of the CD 70 (step S88), and preparation for recording processing by the DSP 10 is performed (step S89).

  Next, the recording process of the track 2 is started, a new file for storing the recorded data is opened by the DSP 10, and the reproduction of the track 2 is started (step S90).

  Next, the recording is finished after the reproduction of the track 2 is finished, and when the reproduction of the track 2 is finished, the recording is paused, and the file storing the recorded data is closed (step S91).

  Next, the recording process of the track 3 is started, a new file for storing the recorded data is opened by the DSP 10, and the reproduction of the track 3 is started (step S92).

  Next, after the reproduction of the track 3 is finished, the recording is finished, and when the reproduction of the track 3 is finished, the recording is paused, the file storing the recorded data is closed (step S93), and this process is finished.

  In this embodiment, when it is determined in step S86 that the state of the DSP 10 is in a state contrary to the control of the system microcomputer 1, information indicating that the DSP 10 is in an abnormal state is stored in the RAM 1b. The DSP 10 is reset, but not only in this form, but in the same manner as the control routines shown in FIGS. 5 and 6, a predetermined time when the communication start-up process between the system microcomputer 1 and the DSP 10 is set by the timer. Information indicating that the DSP 10 is in an abnormal state is stored in the RAM 1b when the communication is not completed within a certain period or when a communication error of a predetermined number of times or more occurs during communication between the system microcomputer 1 and the DSP 10, and the DSP 10 is reset. It's also good.

  As described above, if the DSP 10 is in an abnormal state during content recording, the recording is resumed from the beginning of the recorded track when it is determined that the abnormal state has occurred. It is possible to avoid the problem that the DSP 10 is in an abnormal state due to some factor, and the recorded file cannot be closed and cannot be handled as one file.

[effect]
As described above, according to the present embodiment, the selector selection information and the operation state information stored in the RAM 1b are updated according to the processing state of the DSP 10 changed by the control by the system microcomputer 1, and the DSP 10 When it is determined that the state is abnormal (for example, when the communication start-up process between the system microcomputer 1 and the DSP 10 is not completed within a predetermined time set by the timer, or the state of the DSP 10 is changed during the operation of the DSP 10. 1), when the communication between the system microcomputer 1 and the DSP 10 occurs more than a predetermined number of times, the information indicating that the DSP 10 is in an abnormal state is stored in the RAM 1b. After the DSP 10 is reset, information indicating that the DSP 10 is in an abnormal state. If is stored in RAM1b operation of DSP10 based on the information of the selected state and the operating state of the selector DSP10 stored in the aforementioned RAM1b it is started.

  Therefore, even when the DSP 10 is suddenly reset for some reason, or even when the system microcomputer 1 determines that the DSP 10 has entered an abnormal state and is reset, the operation of the content playback device 100 such as playback continues. can do.

  Also, if the DSP 10 is in an abnormal state during content recording, the recording is resumed from the beginning of the track being recorded when it is determined that the abnormal state has occurred. It is possible to avoid the problem that the DSP 10 is in an abnormal state due to factors, and the recorded file cannot be closed and cannot be handled as one file.

It is a block diagram which shows the structure of a content reproduction apparatus. It is a table | surface list of the parameter for selecting the input signal input into DSP. It is a list of parameters for selecting a selector in the DSP. It is a correspondence table of each set value of input signal selection and DSP internal selector selection for each state of a selected selector. It is a flowchart which shows the control routine of DSP performed by the system microcomputer. It is a flowchart which shows the control routine of DSP performed by the system microcomputer. It is a list which shows the example of the kind of operation state information of a content reproduction apparatus. It is a table | surface which shows the example of a disk structure of CD. It is a flowchart which shows the control routine of DSP performed by the system microcomputer. It is a flowchart which shows the control routine of DSP performed by the system microcomputer in the conventional content reproduction apparatus.

Explanation of symbols

100 content playback device 1 system microcomputer 1a ROM
1b RAM
2 Tuner section 3 Storage section 4 SD memory card slot 5 USB connector 6 Analog audio input section 7 CD mechanism section 8 Analog signal selector 9 ADC
10 DSP
10a Encoder 10b Decoder 11 DAC
12 Amplifier unit 13 Speaker 14 Display unit 15 Operation unit 16 SD memory card 17 USB flash memory 18 Antenna

Claims (7)

First control means;
Second control means controlled by the first control means;
Memory,
With
The first control means stores the result of controlling the second control means in the memory as the processing status information of the second control means, and the second control means When the state is determined, and the second control means determines that the state is abnormal based on the determined state and the state information stored in the memory, the state information stored in the memory is initialized. A content reproduction apparatus characterized by restarting the second control means. 2. The restart of the second control means performed by the first control means is performed using the state information stored in the memory immediately before the restart as an initial setting. Content playback device. The content information according to claim 1 or 2, wherein the state information stored in the memory includes selector selection state information that is information related to a type of content data input to the second control unit. Playback device. The content reproduction according to any one of claims 1 to 3, wherein the state information stored in the memory includes operation state information that is information related to an operation state of the content reproduction device. apparatus. The second control means continuously reproduces a plurality of contents, records the reproduced contents for each content,
The first control unit restarts the second control unit when the second control unit determines that the second control unit is in an abnormal state while the content is being recorded, and then the memory Resuming recording of the content that was being recorded based on the selector selection state information and the operation state information stored in
The content reproduction apparatus according to claim 4. A first control step;
A second control step controlled by the first control step;
Memory process;
With
The first control step stores the result of controlling the second control step as state information of the process of the second control step by the storage step, and the process currently being performed by the second control step If the second control step is determined to be abnormal based on the determined state and the state information stored by the storage step, the state information stored by the storage step And restarting the second control step with the initial setting. A first control means,
Second control means controlled by the first control means;
Storage means,
Function as
The first control means stores the result of controlling the second control means in the storage means as processing status information of the second control means, and the process currently being performed by the second control means If the second control unit determines that the second control unit is in an abnormal state based on the determined state and the state information stored in the storage unit, the state information stored in the storage unit And restarting the second control means.

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