JP2004104337A - Reproducing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reproducing apparatus by detecting whether or not data at a reproduction stop position are changed during no operation of the apparatus so as to prevent reproduction from being restarted from data different from finally reproduced data when any change is detected. <P>SOLUTION: A RAM 3 or 7 stores reproduction restart positional information to restart reproduction at a reproduction stop and data identification information about a reproduction stop position to identify data at the reproduction stop position, the reproducing apparatus reads the reproduction restart positional information and the data identification information of the reproduction stop position stored in the RAM when the reproduction is restarted after the reproduction stop, the reproducing apparatus reads the data identification information at the reproduction restart position present in a position denoted by the reproduction restart positional information from a flash memory card 4, detects whether or not the data are changed by comparing two identification data, and does not restart reproduction from the position denoted by the reproduction restart positional information when the data are changed. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a reproducing apparatus provided with a reproduction resuming means, and more particularly to a reproducing apparatus using a rewritable recording medium.
[0002]
[Prior art]
When the reproduction of the recording medium is stopped, the reproduction restart position information indicating the stop position is recorded in the RAM or the nonvolatile memory to which the power is continuously supplied, and the reproduction restart position is restarted when the apparatus is started again. There is a reproduction method in which reproduction is restarted from the position indicated by the position information. With this method, it is possible to reproduce the data immediately after the previous reproduction. In the case of a recording medium such as a compact disc in which data does not change, if it is possible to identify whether the recording medium has changed, it is possible to correctly resume reproduction from the continuation of the previously reproduced position (for example, see Patent Document 1).
[0003]
However, in the case of a rewritable recording medium, even if the same recording medium is used, the data indicated by the reproduction restart position is deleted or the order of the data is changed by using the recording medium with another device while the device is not operating. In some cases, the data at the reproduction stop position may have changed, and when the reproduction is restarted from the position indicated by the reproduction restart position information, data different from the last reproduced data may be reproduced.
[0004]
Conventionally, in order to prevent reproduction from data different from the data whose reproduction has been stopped in this way, a method of detecting that the recording medium has been removed from the reproduction device and invalidating the reproduction restart position information, or A method is also used in which the total number of data, the total playing time, and the like are recorded in a RAM or a non-volatile memory when playback is stopped, and the playback restart position information is invalidated when there is a change compared to when playback is restarted.
[0005]
[Patent Document 1]
JP-A-5-289829
[Problems to be solved by the invention]
However, in the case of the method of detecting that the recording medium has been removed from the playback device, it is necessary to add a means for detecting that the recording medium has been removed to the playback device. There is a problem that it hinders miniaturization of the device.
[0007]
Semiconductor memory cards, optical disks, magneto-optical disks, and the like are recording media that can store different types of data such as music data, moving image data, still image data, and document data in a single recording medium. It is possible to use other types of data on other devices, but if the type of data targeted by the playback device has not changed, playback can be resumed from the position immediately after the stop position. If it is, the usability is improved for the user.
[0008]
More specifically, suppose that a certain playback device listens to music data halfway, stops playback, and writes still image data to a recording medium by a personal computer. At this time, if the music data that is the target data of the playback device has not changed, if the recording medium is inserted into the original playback device and playback is restarted, if the playback restart position information has not been invalidated, the user will be able to perform the previous playback. Playback can be resumed from the continuation of the position where the music was stopped, but if the method of detecting the removal of the recording medium and invalidating the playback resume position information is used, the playback is started from the beginning of the music album. In other words, the user must listen to the music once listened to again.
[0009]
In addition, the total number of data and the total playing time are recorded in a RAM or a non-volatile memory when reproduction is stopped, and compared with the time when reproduction is resumed. If there is a change, the reproduction resume position information is invalidated. There is a problem in that even if the other parts are changed, the reproduction is restarted from the data changed from the time when the reproduction was stopped. With this method, a change in data can be detected with a small amount of data, but there is a possibility that an erroneous determination may be made because the amount of data to be compared is small. For example, even if the total number of data and the total playing time at the time of reproduction stop and reproduction restart are the same, if the order of the data at the reproduction restart position changes, the change in data cannot be detected, Resumes playback from different data. There is also a method of comparing song titles to determine whether the data at the playback resume position has changed.However, if there is data with the same song title, there is a possibility that an erroneous determination may be made in the same way. As long as the information that can identify is not added to the data, there is a possibility that an erroneous determination may be similarly made using other information.
[0010]
The present invention detects whether the data at the position indicated by the reproduction restart position information has changed while the device is not operating, and when the change is detected, restarts reproduction from data different from the last reproduced data. It is an object of the present invention to provide a playback device capable of preventing such a problem.
[0011]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, a playback device according to the present invention has a playback restart position information storage unit that stores playback restart position information for restarting playback when playback is stopped, and a playback device that identifies data at a position where playback is stopped. Means for reading the data identification information of the stop position from the recording medium, and data identification information storage means of the reproduction stop position for storing the data identification information of the reproduction stop position, wherein the reproduction restart position information and the data of the reproduction stop position are provided. This is a configuration for identifying the last reproduced data using the identification information.
[0012]
In this configuration, when the reproduction is resumed after the reproduction is further stopped, a unit for reading data identification information of a reproduction resume position at a position indicated by the reproduction resume position information from the recording medium, Means for reading the data identification information of the reproduction stop position stored in the data identification information storage means, and comparison means for comparing the data identification information of the reproduction restart position with the data identification information of the reproduction stop position; From the comparison result, it is possible to detect whether the data at the position where the reproduction is stopped and the data at the position where the reproduction is resumed have not changed.
[0013]
Further, a reproduction restart position determining means for determining a reproduction restart position based on the comparison result of the comparing means can be provided.
[0014]
In these configurations, a nonvolatile storage unit can be used as the reproduction restart position information storage unit and the data identification information storage unit of the reproduction stop position.
[0015]
With such a configuration, it is possible to detect a change between the data identification information of the reproduction stop position when the reproduction is stopped and the data identification information of the reproduction restart position at the position indicated by the reproduction restart position information when the reproduction is resumed. Is changed, the reproduction is not restarted from the position indicated by the reproduction restart position information, so that it is possible to prevent the reproduction from being restarted from data different from the last reproduced data.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a playback device using a flash memory card will be described as an example of the playback device according to the first embodiment of the present invention. FIG. 1 is a block diagram of a flash memory card reproducing device. In FIG. 1, reference numeral 1 denotes a microcomputer (hereinafter referred to as a microcomputer). The microcomputer 1 controls the operation of the entire apparatus according to various programs stored in a ROM 2 and is recorded on a flash memory card 4 as a recording medium. The compressed digital audio data is read out to the RAM 7 via the card connector 5 and the card interface 6, and the read digital audio compressed data is supplied to the audio compression decoder circuit 8. The audio compression decoder circuit 8 decompresses the supplied digital audio compression data, returns it to the original digital audio data, and outputs it to the D / A converter 9. The D / A converter 9 converts the input digital audio data into digital audio data. The analog audio signal is converted into an original analog audio signal, and the demodulated analog audio signal is output to the amplifier 10. The amplifier 10 amplifies the input analog audio signal and outputs it to the audio output terminal 11.
[0017]
The flash memory card 4 stores, in addition to the digital audio compression data, data configuration information of the number of playlists, the number of songs, and the total playing time, and management information of the playlist name, song name, song number, and playing time of the song. The information is read out via the card connector 5 and the card interface 6, and the data configuration information is stored in the RAM 3 inside the microcomputer 1, and the management information is stored in the RAM 3 inside the microcomputer 1 or an external RAM 7. The data configuration information is information for managing the entire flash memory card 4, and does not change unless the flash memory card 4 is replaced or the data is changed. The management information is information relating to the music being played or at the stop position, and when the music is switched, this management information is also updated. The microcomputer 1 can display data configuration information or management information on the display unit 14 by driving the display driver 13.
[0018]
The microcomputer 1 as a control unit manages a reproduction position during reproduction or a stop position during stop on the RAM 3 inside the microcomputer 1, and controls reproduction in accordance with an input of the operation unit 12.
[0019]
The operation unit 12 is provided with various keys for allowing the user to perform various operations such as starting and stopping reproduction of the reproduction device. The microcomputer 1 issues commands corresponding to the operations performed on the operation unit 12. Receives and performs control processing according to the command.
[0020]
Regarding the playback apparatus configured as described above, FIG. 2 is a flowchart when acquiring data configuration information according to the first embodiment of the present invention, FIG. 3 is a flowchart when stopping playback, and FIG. The operation will be described with reference to FIG.
[0021]
First, after power is supplied to the reproducing apparatus, the data configuration information of the number of playlists, the total playing time, and the number of songs on the RAM 3 in the microcomputer 1 is initialized in S1 of FIG. When the flash memory card 4 is attached to the card connector 5 in S2, the data configuration information is read out via the card connector 5 and the card interface 6 in S3, and the data configuration information before the reproduction is stopped is read as the data configuration information (1) by the microcomputer. It is stored in the internal RAM3. Thereafter, the stored data configuration information (1) is retained. However, if the flash memory card 4 is removed from the card connector 5 during operation of the playback apparatus in S4, the data configuration information stored in the RAM 3 inside the microcomputer 1 is stored. The information (1) is invalidated, and the next time the flash memory card 4 is inserted into the card connector 5, the data configuration information (1) is acquired again and stored in the RAM 3 inside the microcomputer.
[0022]
Since the power is also supplied to the RAM 3 inside the microcomputer 1 while the power is supplied to the reproducing apparatus, the data configuration information (1) can be held until the power is turned off. In the present embodiment, the data configuration information (1) is stored in the RAM 3 inside the microcomputer, but may be stored anywhere as long as the information can be stored in the RAM.
[0023]
During reproduction, the digital audio compression data is read from the flash memory card 4 to the RAM 7 via the card connector 5 and the card interface 6 in S5 in FIG. 3, and the read digital audio compression data is supplied to the audio compression decoder 8, and in S6 The supplied digital audio compressed data is expanded and output to the D / A converter 9, which converts the data into an analog audio signal, and the demodulated analog audio signal is amplified by the amplifier 10. Output to the audio output terminal 11.
[0024]
The microcomputer 1 outputs the data to the audio output terminal 11, and in S7, reproduces the reproduction position information including the data name and the position from the head of the decompressed digital audio compressed data and the number of frames of the decompressed digital audio signal in S7. It is stored in the internal RAM 3 to manage the reproduction position. In S8, the reproduction stop input is received from the operation unit 12, or the reproduction is stopped when the reproduction to the last data is completed. Until the operation is stopped, the processing from S5 to S8 is repeated. When the reproduction is stopped, the last acquired reproduction position information is stored in the RAM 3 as the reproduction restart position information storage means as the reproduction restart position information when the reproduction is restarted, and is used when the reproduction is restarted.
[0025]
In the stop state, the display unit 14 waits for a certain period of time while the track title and the elapsed time at the stop position are displayed on the display unit 14 until a reproduction restart operation is performed. If the operation of resuming reproduction is performed in S9 during standby, the subsequent reproduction is restarted from the position indicated by the reproduction resuming position information. After a lapse of a fixed time, the process proceeds to automatic power-off processing. At this time, it is checked whether or not the last song has been reproduced in S10. If the reproduction is stopped halfway during the reproduction, 64 bytes of the digital audio compressed data at the position of the reproduction position information acquired last in S11 are read out, and the reproduction is stopped. The data is stored in the RAM 3 inside the microcomputer as data identification information storage means of the reproduction stop position as the data identification information of the position. If the reproduction is stopped until the last tune is reproduced, the reproduction restart position information is invalidated in S12. Next, in step S13, the power of the entire apparatus is turned off. In order to control the operation from the operation unit 12 even while the power is off, the microcomputer 1 is continuously supplied with power.
[0026]
Thereafter, when the input of the reproduction start is received by the operation unit 12, it is determined in S14 of FIG. 4 whether or not the reproduction is restarted from the position where the reproduction is stopped, based on the presence or absence of the reproduction restart position information. If the playback restart position information is present, the playback restart processing is performed from the position indicated by the playback restart position information, and if the playback restart position information is invalid, the playback start position is set in step S21 to start playback from the beginning of the first song. . When the reproduction is restarted from the reproduction stop position, the data configuration information (2) of the number of playlists, the total playing time, and the number of songs is read from the flash memory card 4 in S15 and stored in the RAM 3 inside the microcomputer. Next, in S16, the data configuration information (2) and the data configuration information (1) stored in the RAM 3 inside the microcomputer at the time of reproduction stop are read and compared to check whether the data configuration has been changed. . As a result of the comparison, if the data configuration information (1) at the time of stopping reproduction and the data configuration information (2) at the time of resuming reproduction have changed, it can be identified that the data has changed during the stop. Set the playback start position so that playback starts from the beginning. If the data configuration information (1) and the data configuration information (2) are the same, it is next checked in step S17 whether or not the designated digital audio compression data exists at the position indicated by the reproduction restart position information. A playback start position is set so that playback is performed from the beginning of the first music. If there is data, read out 64 bytes of digital audio compression data at the position indicated by the reproduction restart position information stored in the RAM 3 inside the microcomputer when the reproduction is stopped in S18, and read it into the RAM 3 inside the microcomputer or the external RAM 7. The stored data is compared with 64 bytes of identification data of the reproduction stop position stored in the RAM 3 inside the microcomputer at the time of reproduction stop in S19. If the identification data at the playback stop position is different from the identification data at the playback restart position, it is possible to identify that the data at the time of playback stop and the data at the time of playback restart have been changed. Set the playback start position. If the data at the reproduction stop position and the data at the reproduction restart position are the same, the reproduction is restarted from the position stored as the reproduction restart position information in S20.
[0027]
In this embodiment, the data configuration information, the reproduction restart position information, and the data identification information of the reproduction stop position shown in FIG. A determination is made as to whether data exists at the position, and whether the data at which playback has been stopped and the data at the position at which playback is to be restarted are the same data, and playback restart from data different from the data at the time of playback stop is prevented. FIG. 6 shows reproduction restart information in a conventional reproducing apparatus as a comparison with the present embodiment.
[0028]
When the reproduction is not resumed from the reproduction stop position, in the case of a reproducing apparatus or a recording medium having information of the position to start reproduction in addition to the reproduction stop position, reproduction may be started from a position other than the first music.
[0029]
Further, the data size of the digital audio compressed data at the reproduction stop position and the reproduction restart position need not be 64 bytes. Any size may be used as long as it is sufficient to identify that the data has changed. In the case where the comparison data size of the present embodiment is 64 bytes, if the digital audio compressed data is random binary data, the probability that the digital audio compressed data at the reproduction stop position and the reproduction restart position match will be ^1/2512 . Actually, since digital audio compression data is not completely random binary data, such a probability calculation cannot be performed, but the probability of erroneously determining different digital audio compression data as the same data is sufficiently low. Thus, it is possible to identify whether data has not changed at the time of reproduction stop and at the time of reproduction restart. When the capacity of the RAM 3 inside the microcomputer 1 is small, or in order to reduce the size of data stored in the RAM 3 inside the microcomputer 1, a part of the data at the reproduction stop position, the reproduction restart position, or the entire data is used. It is also possible to perform the same operation as above and use the operation result as identification data.
[0030]
Further, in the above-described embodiment, since information held for resuming reproduction from the reproduction stop position, that is, reproduction restart position information, data identification information of the reproduction stop position, and the like are stored in the RAM 3 inside the microcomputer 1, the power supply is turned off. If this is done, the information becomes invalid. However, this information is written to the flash memory card 4 or, in the case of a playback device having the configuration shown in the block diagram in FIG. By storing the reproduction restart position information and the reproduction stop data identification data, even if the power is turned off, the reproduction restart position information and the reproduction stop data identification data are read from the non-volatile memory 15 after the next power supply. Thus, it is possible to detect whether the data whose reproduction has been stopped and the data at the reproduction restart position have changed.
[0031]
In addition, if the data to be retained or referred to when the reproduction is resumed by the present reproducing apparatus is limited to the data used by the present apparatus, the recording medium is taken out while the reproducing apparatus is not operating and used by another apparatus. Even if the data other than the data is rewritten, when the recording medium is mounted again on the present reproducing apparatus, it is possible to restart the reproduction from the continuation of the last reproduced position before stopping the reproduction.
[0032]
In each of the above embodiments, a flash memory card is used as a recording medium. However, if the recording medium is a rewritable recording medium capable of editing data such as adding, deleting, and changing the order of a song, a magneto-optical disk or a phase change type The present invention is also applicable to a recording medium using an optical disk or magnetic recording.
[0033]
Furthermore, although the music data reproducing apparatus is used as an example, the present invention can be similarly applied to a device that can reproduce a video signal.
[0034]
【The invention's effect】
As described above, in the reproducing apparatus of the present invention, even when the data of the recording medium is changed while the reproducing apparatus is stopped after the reproduction is stopped, it is possible to detect that the data at the reproduction restart position has been changed. It is possible to prevent resumption of reproduction of data other than the data whose reproduction has been stopped.
[0035]
The identification data for identifying the data change can be detected in such a size that it does not become a burden even if it is held in the RAM inside the microcomputer, so that it is not necessary to add a new circuit or the like. . Therefore, there is no need to provide a circuit for detecting that the recording medium has been taken out of the reproducing apparatus, so that the cost of the main unit can be reduced.
[0036]
Also, even if the recording medium is removed while the reproducing apparatus is not operating, and data other than the data used by the present apparatus is rewritten by another reproducing apparatus, if the recording medium is re-attached to the present reproducing apparatus, the reproduction is not performed. It is also possible to restart the reproduction from the continuation of the last reproduced position before stopping.
[Brief description of the drawings]
FIG. 1 is a block diagram of Embodiment 1 of the present invention. FIG. 2 is a flowchart showing an operation when acquiring data configuration information. FIG. 3 is a flowchart showing an operation when playback is stopped. FIG. Flowchart FIG. 5 is an explanatory diagram showing information retained for resuming reproduction in the present embodiment. FIG. 6 is an explanatory diagram showing information retained for resuming reproduction in a conventional reproducing apparatus. Block diagram of Embodiment 2 [Description of References]
1 microcomputer 2 ROM
3 RAM
4 Flash memory card 5 Card connector 6 Card I / F
7 RAM
Reference Signs List 8 audio compression decoder 9 D / A converter 10 amplifier 11 audio output terminal 12 operation unit 13 display driver 14 display unit 15 nonvolatile memory

Claims (4)

Playback stop position information storage means for storing playback restart position information for restarting playback when playback is stopped;
Means for reading, from a recording medium, data identification information of a reproduction stop position for identifying data at a position at which reproduction is stopped;
Comprising a reproduction stop position data identification information storage means for storing the reproduction stop position data identification information,
A reproducing apparatus characterized in that the last reproduced data is identified using the reproduction restart position information and the data identification information of the reproduction stop position. Means for reading the data identification information of the reproduction resume position at the position indicated by the reproduction resume position information from the recording medium when the reproduction is resumed after the reproduction is stopped;
Means for reading the data identification information of the reproduction stop position stored in the data identification information storage means of the reproduction stop position,
Comparing means for comparing the data identification information of the reproduction restart position and the data identification information of the reproduction stop position,
2. The reproducing apparatus according to claim 1, wherein it is detected whether or not the data at the position where the reproduction is stopped and the data at the reproduction restart position have not changed from the comparison result of the comparing means. 3. The reproducing apparatus according to claim 2, further comprising a reproduction restart position determining unit that determines a reproduction restart position based on a comparison result of the comparing unit. 4. The reproducing apparatus according to claim 1, wherein the reproduction restart position information storage unit and the reproduction stop position data identification information storage unit are nonvolatile storage units.

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