JPH07296485A - Disk device - Google Patents

Abstract

PURPOSE:To listen to reproducing music without feeling a sense of incongruity at the time of resuming the reproduction after a long period of time since a power source was turned off in the midst of the reproduction by moving an optical head into a starting position of audio data in the forefront. CONSTITUTION:When an Acc switch 11 is turned off, the optical head H is stopped in its position just at this time, while an operation of a servo control part 7 is also stopped to become a standby mode. When the Acc switch 11 is turned on again, and then if it is judged by a main control device 4 that the previous reproducing mode was a normal reproducing mode, the optical head H is brought back into a read-in position by searching for a starting position of the audio data of the leading music, and a reproducing operation is resumed in numerical order of music under the normal reproducing mode. Then, if it is judged that the previous mode was a random reproducing mode, the audio data are selected and reproduced based on data of random sampling numbers, etc., stored in a memory 5. By this method, even after interruption by turning off the power source, you can listen to the audio data without feeling a sense of incongruity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk device, such as an on-vehicle disk device, in which a power switch such as an accessory switch may be turned off during reproduction of audio data. The present invention relates to a disk device that can restart a reproducing operation without feeling uncomfortable.

[0002]

2. Description of the Related Art In CDs (Compact Discs) and MDs (Mini Discs), a data area in which data including encoded acoustic data is recorded and a TOC (Table of Cons.
tents) and a TOC area in which data is recorded. The TOC data includes the number of songs and the song number of the acoustic data recorded in the data area, the time code of each song, and the like. In the data area, subcodes are included in each frame in addition to acoustic data. In a CD, the subcode includes a time code indicating a song number, a playing time within the song, a cumulative playing time from the beginning of the first song, and the like. In MD,
This subcode includes data indicating the absolute position, and the system controller calculates the data indicating the absolute position, so that the reproduction time and the like can be calculated. A disk device such as a CD player or an MD player is provided with a memory holding the TOC data read from the TOC area and a memory or a register holding the subcode data. The TOC data and the subcode data are referred to. By doing so, the current data reproduction position can be recognized and displayed, and the skip operation to the beginning of each music (movement between music or search operation of target music) can be performed.

When the above disk device is used for a vehicle, the power supply to the main part of the disk device is cut off when the accessory switch (ACC switch) is turned off. Therefore, the ACC switch was turned off to stop the power supply to the main parts during the playback of the song, and the disc was loaded into the disc device again and the A
It frequently happens that the CC switch is turned on and the power supply to the main part is restarted. As the recovery operation of the reproduction at this time, after the power supply to the main part is cut off by turning off the ACC switch, the TOC data and the subcode data are held in the nonvolatile memory. And ACC
When the switch is turned on again, the reproduction interruption position is searched by referring to the TOC data and the subcode data held in the nonvolatile memory, and the reproduction operation is continuously resumed from the interruption position. There is a way.

[0004]

However, in the above-mentioned conventional example, the ACC switch is turned off during the reproduction of the music, and immediately after the ACC switch is connected, the music flows out from the middle of the music. , It is difficult for listeners to hear. In particular, turn off the ACC switch during song playback, park for a long time, and then ACC
In the case where the switch is connected, since it has been a while since the music was interrupted, restarting the reproduction from the middle of the music makes the listener feel uncomfortable.

The present invention is to solve the above-mentioned conventional problems, and when the power switch is reconnected, for example, the reproduction is always restarted from the start position of the music so that the listener does not feel uncomfortable. In addition, it is an object of the present invention to provide a disc device in which the music to be resumed can be randomly selected or the reproduction can be resumed from a desired music.

[0006]

DISCLOSURE OF THE INVENTION The present invention relates to a disc device provided with a rotary drive mechanism for rotationally driving a disc on which a plurality of sets of acoustic data are recorded, and an optical head for reproducing the acoustic data recorded on the disc. In the first means, as a first means, when the power switch is turned off while the optical data of one of the sets is being reproduced by the optical head and the power switch is connected after that, the audio data of the first set of The start position is searched, and the reproduction operation is restarted from that position,

As a second means, when the power switch is turned off while the optical data of one of the sets is being reproduced by the optical head and the power switch is connected after that, among the plurality of sets of the sound data. The start position of the acoustic data randomly selected in is searched, and the reproduction operation is restarted from that position,

As a third means, when the power switch is turned off while the acoustic data of any set is being reproduced by the optical head and the power switch is connected after that, a part of the acoustic data of each set is generated. Are sequentially searched and only a part thereof is reproduced, and when a cancellation command of the search operation is given, the reproduction is restarted from the acoustic data reproducing the part,

Further, at the time of reproducing operation, a memory is provided which can store a part of the start position of the acoustic data being reproduced and can retain the memory when the power is turned off. When the power switch is turned off during the playback of and the power switch is connected after that, the start portion of the acoustic data of each set is sequentially searched to detect the data, and the detected data and the memory are stored in the memory. When the matched data matches, the reproduction is resumed from the matched data portion.

[0010]

In the first means, while the encoded audio data is being read from the disc and the music is being reproduced, the power switch such as the ACC switch of the automobile is turned off to supply power to the main part. When the power supply is cut off and the power switch is connected after that, the optical head moves to the acoustic data of the first set (the start position of the acoustic data of the first song), and the TO
The start position of the first set of acoustic data is searched based on the C data or the like. Then, the reproduction is restarted from the start position of the acoustic data of the first group, and thereafter the acoustic data is sequentially reproduced in the order of the second group and the third group.

In the second means, after the power switch is reconnected, one of a plurality of sets of acoustic data is randomly selected and selected according to, for example, random number table data held in advance in a memory or the like. The optical head moves to the start position of the acoustic data of the other set, the start position is searched, and the reproduction is restarted from that position. After the reproduction of the acoustic data is completed, the subsequent sets of acoustic data are sequentially reproduced.

Also, after the power switch is reconnected,
As described above, whether to resume the reproduction from the start position of the first set of acoustic data or randomly select the acoustic data to start the reproduction, and start the reproduction in order from the selected set of acoustic data. It is also possible to make selection possible with, for example, an operation button.

In the third means, when the power switch such as the ACC switch is turned off and the power switch is reconnected after that, the operation mode is set to sequentially search the start position of the acoustic data of each set. For example, a part of the data (for example, about 2 to 5 seconds) of the start position of the first set of acoustic data (first piece of acoustic data) is reproduced, and then the second set and the third set are arranged in this order. Only a part of the data at the start position of the audio data is reproduced. The listener will sequentially hear only the head portion of each set of acoustic data (each song). At this time, when the head portion of the acoustic data that one wants to hear is reproduced, if the search operation is sequentially canceled by operating the operation button (for example, the reproduction button), the acoustic data reproduced when it is released The reproduction is sequentially restarted from.

Further, the order of reproducing the start portion of the sound data of each set is not limited to the order of the music number, and for example, a part of the start position of the sound data of each set is reproduced in a random order based on the random number table, and the listening position is reproduced. When the acoustic data that the person wants to hear is reproduced, if the search operation is sequentially canceled, the reproduction may be continued from the acoustic data that is being reproduced at that time in the order of song numbers.

Alternatively, when the sequential search operation is cancelled, the acoustic data being reproduced is reproduced, and after the reproduction of the acoustic data of the set is completed, another music piece is reproduced in a random order. May be.

Further, when reproducing a part of the sound data of each set, it is not always necessary to reproduce a part of the start position of the music, and the middle position of the sound data (the middle part of the music) is reproduced for several seconds, and each music is reproduced. The middle part may be sequentially reproduced every time. In this case, when the listener cancels the search operation when the acoustic data he / she wants to hear is reproduced, the reproduction is resumed from the data being reproduced (the middle position of the song). Or, when listening to the middle part of the songs that are played one after another and canceling the sequential search operation,
The start position of the acoustic data of the set being reproduced at that time may be newly searched, and the reproduction may be restarted from the start position of the acoustic data of the set.

In the fourth means, in the normal reproduction mode, the data of a part of the start position of the acoustic data of the set being reproduced is held in the memory. The content stored in the memory is updated each time the acoustic data of each set is reproduced. The stored contents of this memory are retained even when the power switch is turned off. After the power switch is turned off, and then the power switch is reconnected, the TOC data is referenced, and the music data is selected from the first set of acoustic data in the order of the song numbers or from the randomly selected set of the acoustic data. Data of only a part of the start position of the acoustic data of each set is randomly detected by the optical head in the order of numbers or based on a random number table. The sequentially detected data and the data stored in the memory at that time are compared, and when the both data match, the reproduction is restarted from the acoustic data including the matched data in the order of song numbers or at random. .

With this, it is possible to resume the reproduction of the acoustic data whose reproduction was interrupted when the power switch was turned off, from the start position after the power switch was connected. As described above, in each of the above embodiments, it is possible to restart the reproduction from the start position of each acoustic data, and thus,
The listener does not feel uncomfortable as compared to the case where the reproduction is restarted from the middle of the song.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are flow charts showing the control operation of the disc device of the present invention for each embodiment, and FIG. 4 is a circuit block diagram showing the configuration of a vehicle-mounted CD player as an example of the disc device of the present invention. The disc D shown in FIG. 4 is a compact disc (CD). The recorded content is
The lead-in position on the inner circumference side is the TOC area, and the outer circumference position is the data area. In the recording format of the data area, generally, a plurality of sets of acoustic data (acoustic data of a plurality of songs) encoded in frame units are recorded, and a sub-code is recorded together with the acoustic data. The subcode contains the song number of the song to which the frame belongs,
It includes a time code indicating the playback time within the song and a time code indicating the cumulative playback time from the beginning of the first song. The TOC data recorded in the TOC area includes the number and the song number of the acoustic data recorded in the data area, the start time (start position) of the beginning of the song, and the end time (end position) of the song. The time code indicating is included.

The disk D is clamped on the turntable 10, and the turntable 10 is rotationally driven by the spindle motor M1. The turntable 10 and the spindle motor M1 form a rotation drive mechanism for the disc. Laser light emitted from the semiconductor laser in the optical head H is focused on the recording surface of the disk D by the objective lens L. The return light modulated by the pits on the recording surface of the disc is detected by the light receiving element in the optical head H.
Detection output (reproduction output or read output) in the optical head H
The RF output is sent to the RF amplifier 1, amplified and waveform-shaped, and sent to the decoder 2. In the decoder 2, acoustic data, TOC data, subcode data, parity, etc. are obtained from the waveform-shaped RF signal. Parity error correction is applied to the acoustic data,
The acoustic data is demodulated. Then, the sound data is converted into an analog signal by the D / A converter (digital-analog converter) 3 and becomes an audio output (sound output).

The main controller (system controller) 4 is
It is composed of a ROM that stores a control program, a CPU that executes processing operations based on the control program, and a register. TOC obtained by decoder 2
The data and the subcode data are given to the main control unit 4 via the route (a). The TOC data is held in the memory (storage unit; for example, nonvolatile memory: RAM) 5. The subcode data is held in the memory 5 or another memory or a register in the main control unit 4. The operation unit 6 has various operation buttons and is used to input a selection of a processing operation to the main control unit 4. Servo controller (servo controller) 7
Are controlled by the main controller 4. The tracking error signal and the focus error signal obtained by the four-division light receiving section in the optical head H are given to the servo control section 7 through the route (b). The correction mechanism in the optical head H is operated by the tracking servo signal given from the servo control unit 7, the objective lens L is finely driven in the tracking correction direction (track crossing direction), and similarly obtained from the servo control unit 7. The objective lens L is finely driven in the focus correction direction by the focus servo signal.

The optical head H is driven in the cross-track direction by a feed mechanism 9 (for example, a screw shaft) driven by a feed motor M2. The rotation of the feed motor M2 is controlled by the servo controller 7. Similarly, the spindle motor M1 of the rotary drive mechanism is controlled by the servo control unit 7 so that it can be driven at a constant speed. Electric power is supplied from the battery 12 of the automobile to each part of the disk device. The accessory switch (A
When the CC switch 11 is turned off, the power supply to the main parts (for example, the motor drive unit and the optical head) of the disc device is cut off. However, the minimum electric power required for the control operation of the main control unit 4 continues to be supplied from the battery 12 to the main control unit 4 and the like even if the ACC switch 11 is turned off. Also AC
Switching information of ON (connection) -OFF (off) of the C switch 11 is given to the main control unit 4.

Next, the operation of the disk device of the first embodiment will be described with reference to the flow chart shown in FIG. Each operation described below with reference to FIG. 1 is performed based on a control program stored in a ROM in the main control unit 4.
It is executed by the CPU inside. In FIG. 1, when the disk insertion is detected (S1), the disk D is drawn in by the disk loading mechanism (not shown) and clamped on the turntable 10. Then, the spindle motor M1 is started by a command from the main control unit 4, and the disk D is rotationally driven. Similarly, the feed motor M2 is started by a command from the main controller 4, and the feed mechanism 9 drives the optical head H2.
Is transferred to the lead-in position on the inner circumference of the disk, and the TOC data in the TOC area of the disk D is read by the optical head H (S2). This TOC data is sent from the decoder 2 to the main control unit 4 and held in the memory (storage unit) 5.

Then, the mode shifts to the normal reproduction mode (normal play mode) (S3). The normal playback mode refers to the TOC data stored in the memory 5 and is a mode in which playback operations are performed in the order of song numbers from the first set of acoustic data (first song), or randomly on the operation unit 6. When a playback operation is instructed, by referring to the random number table data stored in the memory or the like in the main control unit 4, the acoustic data (each song) of each set is randomly selected and played. It is a mode that will be played. During the reproducing operation, the subcode data of the RF signal read by the optical head H is sent from the decoder 2 to the main control unit 4, and the music number information in the subcode and the time code indicating the time are sequentially stored in the memory 5. Alternatively, it is sent to another memory or a register in the main control unit 4. Then, on the display (not shown), the number of the tune being reproduced, the reproduction time, etc. are displayed in "minutes" or "seconds".

When the operation button of the operation unit 6 is pressed to select the forward (FWD) or backward (BWD) skip (SKIP) operation in the normal reproduction mode, the data is held in the memory 5. The TOC data is referred to, the feed motor M2 is controlled, and the optical head H skips to the beginning position of the selected music (movement between music, music search movement), and the reproduction is restarted from that position. During the normal reproduction mode, the main controller 4 monitors whether the ACC switch 11 is turned off (whether it is turned off) (S4). A
When the CC switch 11 remains on, the operation mode is not changed and the normal reproduction mode is continued.

When the ACC switch 11 is turned off (turned off) and the power supply to the main part of the disk device is cut off, and the main control part 4 recognizes this, a stop process (STOP process) is performed by the main control part 4. (S5). That is, the spindle motor M1 stops to stop the rotation of the disk D, and the feed motor M2 stops to stop the optical head H at the position at that time. Further, the servo lock of the tracking servo and the focus servo in the servo control unit 7 is released. Further, the operations of the RF amplifier 1 and the decoder 2 are stopped. And standby mode (sleep mode)
Is switched to (S6).

ACC switch 1 in standby mode
It is monitored whether 1 is turned on (S7), and when the ACC switch 11 is turned on again, the reproducing operation is restored.
At this time, there are two return methods, namely the steps shown in S8 and S9 and the steps shown in S11 and S12. These two steps differ depending on whether the normal reproduction mode before the ACC switch is turned off is the random reproduction or the mode in which the audio data is reproduced sequentially in the order of the music numbers. Here, the random reproduction is based on the data of the random number table stored in the memory or the like in the main control unit 4 as described above, regardless of the order of the song numbers. ) Means that it is randomly selected and played. Random playback, operation unit 6
It is switched by pressing a random reproduction instruction button among various operation buttons provided on the. In this embodiment, when a random reproduction instruction is given by the operation unit 6 and the ACC switch 11 is turned off while random reproduction is being performed, it is determined that the random reproduction mode is set, for example, in the memory in the main control unit 4. It keeps being remembered.

When the ACC switch 11 is reconnected and it is determined that the mode before the switch is turned off is not the random reproduction (S10), the feed motor M2 is controlled by the command from the main control section 4, The optical head H is returned to the head direction (lead-in position direction) of the data by the rotational power, and the start position of the acoustic data of the first set (acoustic data of the first song) is searched (S8). Then, the mode shifts to the normal reproduction mode (normal play mode) (S9). That is, the reproducing operation is performed in the order of the song numbers in the order of the first set of acoustic data (the first song's acoustic data), the second set (the second song), and the third set (the third song). Note that when the random reproduction operation is instructed by the operation button of the operation unit 6 while the first set of acoustic data is being reproduced, after the reproduction of the first set of acoustic data is completed,
The random reproduction mode is entered, and the music number is randomly selected based on the above-mentioned random number table data and the reproduction is performed.

Next, when the ACC switch 11 is reconnected and it is determined that the previous mode was the random reproduction mode (S10), the random number table stored in the memory in the main control section 4 is displayed. Based on the data and the like, only one set of acoustic data of any set (any tune number) is randomly selected. That is, the music number of the audio data selected at this time may be the fourth or the tenth. Based on this random selection, the feed motor M2 is controlled to move the optical head to the selected start position of the acoustic data, and the start position is searched (S11). Then, the sound data of the set is reproduced in the normal reproduction mode (S12). After the reproduction of the selected first set of acoustic data is completed, another music piece number is further selected based on the random number table data, and the random reproduction is restarted. Alternatively, if the initially selected acoustic data is, for example, the 8th song, then the 9th song, 1
You may shift to the mode which is reproduced | regenerated in order of a music number like 0th music.

In the above description, step 10 in FIG.
The determination in (S10) is based on whether or not the random reproduction mode was set before the ACC switch was turned off. However, whether the reproduction operation return mode after the ACC switch is turned off and reconnected is the mode of S8 and S9 or the mode of S11 and S12 is determined in advance by the operation unit 6
It is also possible to enable setting input with any of the operation buttons and store which step to use in a memory or the like in the main control unit 4. In this case, regardless of whether the setting before the ACC switch 11 was turned off was the random reproduction mode or the reproduction mode in the order of music numbers,
After the ACC switch is connected again, be sure to S8 and S9
Or the steps S11 and S12 are always followed to shift to the normal reproduction mode.

FIG. 2 shows the operation of the disk device according to the second embodiment of the present invention. The operation up to step 7 (S7) of this embodiment is the same as that of the embodiment shown in FIG. In FIG. 2, when the ACC switch 11 is reconnected in step 7 (S7), the search operation is sequentially performed (S13). FIG. 3 shows the acoustic data recorded in the data area of the disc D, and the first tune, the second tune, ... Nth tune means a set of acoustic data corresponding to one tune, respectively. There is. In the sequential search operation, first
The start position of the acoustic data of the song (the acoustic data of the first set) is searched, and n seconds (for example, 2 seconds to 5 seconds) from the starting position are searched.
The acoustic data of the first music piece is reproduced only for about a second). After that, the start position of the second music data is searched,
The song is played for n seconds from the start position. Then 3
The tunes are reproduced for the nth second from the starting position in order from the start position to the final tune (Nth tune). This operation is performed by step 14 (S14) and step 15 (S1) in FIG.
5).

When the ACC switch 11 is reconnected,
The listener is n at the start position from the first song to the last N songs.
You will listen to the songs in sequence for only a second. At this time, when the start position of any song is heard, the operation unit 6
When any one of the operation buttons (for example, the reproduction button) is pressed, the search operation is sequentially canceled when the operation button is pressed (S17).
Then, the normal playback mode is entered. That is, the music including a part heard at the time of pressing the operation button is reproduced as it is, and further, the next music and the next music are reproduced in the order of the music numbers. Alternatively, the random reproduction may be performed by referring to the random number table data after all the music pieces reproduced at the time when the sequential search operation is canceled are reproduced.

Further, in S13, S14, and S15 of FIG. 2, when the acoustic data of each song is sequentially reproduced for n seconds from the start position, the sequential search operation release operation shown in S17 is not performed and the final operation is finished as it is. When the reproduction of the start position of the Nth song is completed, as shown in S16, the normal play mode shown in S18 is entered without waiting for the instruction to cancel the sequential search operation. That is, while the start position of each music is being sequentially reproduced, the sequential search operation is not canceled in S17, and when the reproduction of the start position of the final Nth music data is reached, the search is returned to the first music. Without
All the audio data of the N-th song is reproduced as it is. Then, when the reproduction of the sound data of the Nth song is completed, the reproduction operation is ended. Further, when the continuous reproduction mode is selected by the operation button of the operation unit 6 while the audio data of the Nth song is being reproduced, after the reproduction of the Nth song is completed,
The reproducing operation is continued from the start position of the acoustic data of the music piece in the order of the music piece number.

In FIG. 2, step 16 (S16) is not provided, and after the reproduction for n seconds at the start position of the acoustic data of the Nth song, the start position of the first song, the second song, and the third song are sequentially performed. The n seconds of reproduction may be repeated, and the n seconds of reproduction may be repeated until the operation of canceling the sequential search operation in S17 is performed. Note that step 13 shown in FIG.
The portion of the music sequentially searched in (S13) is not limited to the start position of the acoustic data of each set, and for example, a predetermined time has elapsed from the start position of the acoustic data of each set (acoustic data of each song). Part (eg 15 seconds or 3 from the beginning of the song)
It is also possible to search for a portion where 0 seconds has elapsed), reproduce the acoustic data of the portion for n seconds, and repeat this in sequence for each acoustic data of each song. Then, when a part of the song that the listener wants to hear is being reproduced, step 17 (S
When an instruction for canceling the search operation is sequentially issued in 17), reproduction is performed from the middle part of the music as it is, and thereafter each music is reproduced in order of music number or randomly (S18).
Alternatively, when a cancellation instruction of the search operation is sequentially issued while a part of the desired music is being reproduced (S17), the start position of the music is newly searched and the normal reproduction operation is started from the start position of the music. May be restarted.

By thus sequentially searching and reproducing the middle part of the music rather than the start position of the music,
Since a slight silent time at the start position of the music does not flow to the speaker, it is possible to improve the connectivity for the partial reproduction of each music flowing in the sequential search operation. Further, by partially reproducing the portion other than the start position of the music, for example, the characteristic portion of the music other than the prelude can be reproduced, and the listener can easily recognize which music.

FIG. 5 is a flow chart showing the operation of the disk device according to the third embodiment of the present invention, and FIG. 6 is a circuit block diagram showing the structure of the disk device. In the disk device shown in FIG. 6, a memory controller 15 is interposed between the decoder 2 and the D / A conversion unit 3, and the memory 16 is controlled by the memory controller 15. The memory 16 is, for example, a nonvolatile RAM
Thus, the stored contents can be retained even after the ACC switch 11 is turned off. In this embodiment, the decoder 2 is controlled by the memory controller 15.
Only a part of the start position of each set of the acoustic data sequentially demodulated in (3) is sequentially stored in the memory 16.

That is, in the normal reproduction operation mode (S3) of FIG. 5, a predetermined amount of data from the start position of the acoustic data reproduced in the order of music number or the acoustic data randomly selected and reproduced is stored in the memory. 16 are sequentially stored. For example, when the acoustic data of the first music is being reproduced, a predetermined amount of data is stored in the memory 16 from the start position of the music.
Is stored in the
A predetermined amount of data is stored in the memory 16 from the start position of the acoustic data of the second music. At this time, a predetermined amount of data at the start position of the acoustic data of the first music piece is erased from the memory 16 as needed. Further, even after the ACC switch 11 is turned off in step 4 (S4) and the stop process (S5) is started, the start position of the acoustic data being reproduced when the ACC switch 11 is turned off in the memory 16. The holding of a predetermined amount of data for the portion is continued.

In FIG. 5, except for the storage operation of the memory 16, the steps up to step 7 (S7) are the same as those in the respective embodiments. When the main control unit 4 confirms that the ACC switch 11 is reconnected in step 7, the search operation is sequentially performed (S19). In this sequential search operation, a predetermined amount of data from the start position of the plurality of sets of acoustic data stored in the disc D is sequentially detected by the optical head H, such as the first song, the second song, and the third song. A predetermined amount of data from the start position of each acoustic data is sent to the main control unit 4 from the decoder 2 without being output as an audio, and the main control unit 4 sequentially outputs a predetermined amount of data for the search operation and AC.
The data that has been held in the memory 16 since the C switch 11 was turned off is compared (S20). Then, when the comparison data match, a shift is made to the normal reproduction mode (S21). When it is determined in step 20 (S20) that the two data match, the data of the start position stored in the memory 16 is directly sent to the D / A conversion unit 3 for audio output, and then shock proof. If the data sequentially sent to the memory 16 is converted into an audio output, the tune that was being played when the ACC switch was turned off will always be played from its start position.

As described above, in each of the embodiments, it is possible to reproduce the acoustic data of each set (acoustic data of each song) from the start position thereof, and thus when the ACC switch is reconnected. The sound that is played back and that flows from the speaker becomes a good break, and the listener does not feel uncomfortable. It should be noted that although the above embodiment has described the device using the CD as the disc, the same can be applied to the case of reproducing the MD (mini disc) and other discs. In a disk device using an MD, compression data decompression processing and shock proof processing are added to the encoding processing by the decoder 2 shown in FIG. 6, but the operation shown in FIGS. 1, 2 and 5 is performed by the main control unit. Four
Can be executed in the same manner as in the case of CD.

[0040]

As described above, according to the present invention, when the power switch is turned off and the switch is connected next time, it is possible to always start the reproduction from the start position of the music,
The listener does not feel uncomfortable.

According to the first aspect of the invention, reproduction is always performed from the first set of acoustic data. According to the second aspect of the present invention, since the start position of the acoustic data is randomly determined when the power switch is reconnected, the reproduction / restoration operation is of interest to the listener. According to the third aspect of the invention, it is possible to select the acoustic data for starting the reproduction when the power switch is reconnected while actually listening to a part of the acoustic data. In the invention according to claim 4, it is possible to reproduce the acoustic data that was being reproduced when the power switch was turned off, from the start position.

[Brief description of drawings]

FIG. 1 is a flowchart showing the operation of a disk device according to a first embodiment of the present invention,

FIG. 2 is a flowchart showing the operation of the disk device of the second embodiment of the present invention,

FIG. 3 is an explanatory diagram showing a relationship between audio data and a reproduction position corresponding to the flowchart shown in FIG.

FIG. 4 is a circuit block diagram showing a configuration of a disk device according to the first and second embodiments,

FIG. 5 is a flowchart showing the operation of the disk device of the third embodiment of the present invention,

FIG. 6 is a circuit block diagram showing a configuration of a disk device according to a third embodiment,

[Explanation of symbols]

 D disk H optical head M1 spindle motor M2 feed motor 1 RF amplifier 2 decoder 4 main control unit 5 memory 6 operation unit 9 feed mechanism 11 ACC switch 15 memory controller 16 memory

Claims (4)

[Claims] 1. A disk device comprising a rotary drive mechanism for rotationally driving a disk on which a plurality of sets of acoustic data are recorded, and an optical head for reproducing the audio data recorded on the disk. When the power switch is turned off while the acoustic data of the set is being reproduced, and then the power switch is connected, the start position of the acoustic data of the first set is searched, and the reproduction operation is restarted from that position. A disk device characterized by the following. 2. A disk device comprising a rotary drive mechanism for rotationally driving a disk on which a plurality of sets of acoustic data are recorded, and an optical head for reproducing the audio data recorded on the disk. When the power switch is turned off while the set of acoustic data is being reproduced, and then the power switch is connected, the start position of the randomly selected acoustic data of the plurality of sets of acoustic data is searched for, A disk device in which the reproducing operation is restarted from that position. 3. A disk device comprising a rotary drive mechanism for rotationally driving a disk on which a plurality of sets of acoustic data are recorded, and an optical head for reproducing the audio data recorded on the disk. When the power switch is turned off while the acoustic data of a set is being played back, and then the power switch is connected, a part of the acoustic data of each set is searched in sequence and only that part is played back. A disk device, wherein reproduction is restarted from acoustic data that is partially reproduced when a cancellation command is given. 4. A disk device comprising a rotary drive mechanism for rotationally driving a disk on which plural sets of acoustic data are recorded, an optical head facing the disk, and a feed mechanism for moving the optical head along the disk. During playback operation, a memory is provided that can store a part of the start position of the audio data being played and retain that memory when the power is turned off. When the power switch is turned off in the middle of the operation, and then the power switch is connected, the start portion of the acoustic data of each set is sequentially searched to detect the data, and the detected data and the data stored in the memory are When the two match, the reproduction is restarted from the matched data portion.