JP3791697B2 - Disc player - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a disc player having a double speed search function for quickly searching for arbitrary information data in information data recorded on a disc.
[0002]
[Prior art]
Conventionally, as such a disc player, a CD player that mainly reproduces a compact disc (hereinafter simply referred to as a CD) has been widely used.
[0003]
However, in recent years, not only a reproduction-only disc such as a CD but also a mini disc (hereinafter simply referred to as MD) having a disc capable of rewriting information data has been considered.
[0004]
The MD stores an information recording disk in a protective cartridge case, and not only reproduces recorded information but also records new information or rewrites recorded information. It is possible.
[0005]
Then, general MD is demonstrated based on FIG. FIG. 4 is a plan view showing a configuration of a general MD.
[0006]
In FIG. 4, an MD 300 includes an information recording disk main body 301 that is an optical disk or magneto-optical disk having a diameter of about 6 cm, a protective cartridge case (hereinafter simply referred to as a case) 302 that protects the disk main body 301, and a disk main body. An access hole 303 formed in the case 302 for accessing the 301, a slide shutter 304 for opening and closing the access hole 303, and an ID hole 305 formed in the case 302 indicating a disk type to be described later. Have.
[0007]
The disc type includes a reproduction-only pre-mastered type in which information data fixed in advance is recorded, and a rewritable recordable type.
[0008]
The pre-mastered type has a structure in which the slide shutter 304 is provided only on one side of the case 302 so that a light beam from an optical pickup of an MD player that reproduces the MD can be irradiated to the disk surface of the disk main body 301 that is an optical disk. It has become. The ID hole 305 in the pre-mastered type is only the hole portion 305a.
[0009]
In the recordable type, the slide shutters 304 are provided on both sides of the case 302, and a magnetic field is applied to the disk surface opposite to the disk surface irradiated with the light beam when recording on the disk main body 301 which is a magneto-optical disk. The magnetic head of the MD player is structured to face each other. Note that the ID hole 305 in the recordable type includes the hole part 305a and the hole part 305b. The opening of the hole part 305a can be opened and closed by a recording prevention hook (not shown). When the opening is set to the open state, the disc cannot be recorded, and when the opening of the hole portion 305a is closed, the disc can be recorded.
[0010]
For convenience of explanation, the MD 300 is generically called a disk.
[0011]
Next, an MD player that reproduces information data recorded on such a disc or rewrites information data recorded on the disc will be described. FIG. 1 is a block diagram illustrating a schematic configuration of a control unit and a signal processing unit that control a general MD player.
[0012]
In FIG. 1, the MD player has an audio system, a servo system, and a control system. In the audio system, the disk surface is irradiated with a light beam, and the disk is reflected by the light beam reflected on the disk surface. 300, an optical pickup 11 that reads information data recorded on the disc main body 301, an RF amplifier 12 that amplifies a high-frequency signal read by the optical pickup 11, and an address signal obtained from the RF amplifier 12. An ADIP (ADdress In Pre-groove) signal processing unit 13, a signal processing unit 14 that converts a read signal obtained from the RF amplifier 12 into audio data of a digital signal and performs predetermined signal processing, The audio data obtained from the signal processing unit 14 is compressed on the time axis and written in the DRAM 15, and The memory controller 16 that outputs the audio data read from the RAM 15 asynchronously to the writing time, that is, at a slow reading rate, and the time axis of the audio data obtained from the memory controller 16 are expanded, and various audio sensations are added to the audio data. It includes an ATRAC (Adaptive TRansform Acoustic Coding) signal processing unit 17 that performs correction, and a D / A converter 18 that converts audio data of a digital signal obtained from the ATRAC signal processing unit 17 into an analog signal. Although not shown in the drawing, when the MD player is provided with a magnetic head so that recording is possible, the ATRAC signal processing unit 17 compresses the audio signal and sends the compressed audio signal to the magnetic head. To do.
[0013]
The D / A converter 18 is connected to a speaker 20 that outputs the analog audio signal amplified by the audio amplifier 19 via an audio amplifier 19 that amplifies the analog audio signal.
[0014]
In the servo system, a servo processing unit 21 that receives other signals such as a read synchronization signal component and a tracking error signal obtained by the RF amplifier 12 and generates a drive control signal; and the servo processing unit 21 Control from the servo processing unit 21 and a driver 22 that generates a drive signal for driving a light beam irradiation means of the optical pickup 11, a tracking actuator, a focus actuator, and a sled motor (all not shown) by the control signal from And a driver 25 that generates a rotational speed control signal for controlling the rotational speed of the spindle motor 24 that rotationally drives the disk main body 301 mounted on the turntable 23 by the signal.
[0015]
In the control system, an ID hole detection mechanism 26 for detecting an ID hole 305 provided in the case 302 of the disk 300, a key input interface 27 for receiving input data from an operation unit (not shown), and the turntable 23, a disc loading mechanism 28 composed of an actuator for loading operation when a disc is mounted on the disc 23 and various sensors in the MD player, and the MD player as a whole, as well as a radio tuner, a tape deck function, etc. And a CPU 29 which is a control means for communicating with a center unit (not shown) having a volume adjustment function and the like, and a display driver 31 for driving the display 30 based on display data output from the CPU 29. ing. The CPU 29 includes a memory unit (not shown) that stores various data such as TOC information.
[0016]
The MD player configured as described above is provided with a track jump function for quickly moving the optical pickup 11 in the disc radial direction.
[0017]
The track jump function is, for example, when the memory capacity of the DRAM 15 is in a paused state during disk playback, or when the optical pickup 11 successively forwards (forwards) or rewinds (rewinds) one after another in a search process described later. To be executed.
[0018]
As shown in FIG. 1, in the normal track jump, a command is sent from the CPU 29 to the servo processing unit 21 via the control line A, and the servo processing unit 21 applies a drive voltage as the control signal to the driver 22. The driver 22 is executed by applying a predetermined jump voltage as a drive signal to the optical pickup 11. The number of jumps corresponding to the movement distance in the track jump can be arbitrarily set by the CPU 29.
[0019]
The conventional double speed search process to be described below uses the track jump function, and on the other hand, while permitting audio data output, a predetermined number of track jumps → several units of data reading → a predetermined number of track jumps → several units of data reading This is a process of searching for an arbitrary piece of music from information data recorded on the disc, for example, a piece of music, by repeatedly performing...
[0020]
A conventional double speed search process in the MD player will be described with reference to FIGS. FIG. 5 is an explanatory view simply showing the movement of the optical pickup 11 in the double speed search process.
[0021]
FIG. 5 shows a double speed search process in the forward direction with 4 jumps and 2 read data (sound output time of about 120 msec). The optical pickup 11 is moved in the forward direction (periphery direction of the disk) by 4 jumps. Then, after the four jumps of the optical pickup 11 are completed, data reading of two sectors is executed, and after the reading of the two sectors is completed, the four jumps are executed again, and repeatedly executed until an arbitrary song is found.
[0022]
FIG. 6 is an explanatory diagram showing an operation state of the optical pickup 11 in the double speed search process in which the music data recorded on the disk in a spiral manner is linear for convenience, that is, in units of sectors. As shown in FIG. 6, each sector is represented as S0, S1, S2,..., But is actually interleaved on the disk and arranged with a certain degree of variation, and the address of the music data is simplified. In order to achieve this, it is assumed that S0, S1, S2,. Further, the number of sectors on the circumference differs between the outer and inner circumferences of the recording area of the disc, and the track position of the disc shown in FIG. It is assumed that fast jump of about 16 sectors is performed by jump.
[0023]
As shown in FIG. 6, the CPU 29 in the double speed search process causes the optical pickup 11 to perform a reading operation up to the sector S0, and stores the song data up to the sector S0 in the DRAM 15 so that the song data can be reproduced. Next, the four jumps for moving the optical pickup 11 from the sector S1 to the sector S16 are executed, and after the four jumps, the reading operations of the sectors S17 and S18 are executed. Then, the CPU 29 stores the read music data of the sectors S17 and S18 in the DRAM 15, makes the music data of the sectors S17 and S18 stored in the DRAM 15 reproducible, and executes four jumps again. . If the music data stored in the DRAM 15 is reproduced as it is, the reproduction is performed at a predetermined magnification.
[0024]
FIG. 7 is an explanatory diagram for comparing the playback time during normal playback required for the same number of sectors with the playback time during double speed search processing.
[0025]
As shown in FIG. 7, when the optical pickup 11 passes from the sector S1 to the sector S18, it is necessary to store the song data from the sector S1 to the sector S18 in the DRAM 15 and reproduce the song data during normal reproduction. Although time is required for 18 sectors, the music data of sectors S17 and S18 is stored in the DRAM 15 after execution of four jumps from sector S1 to sector S16 in the double speed search process, and the music data is stored in the DRAM 15. The time required for reproduction is only two sectors of sectors S17 and S18.
[0026]
Therefore, in the double speed search process, 18 sectors / 2 sectors = 9 double speed search. In order to increase the speed, it is conceivable to shorten the reproduction time. However, there is a limit to shortening the reproduction time, and the number of track jumps may be increased.
[0027]
The TOC (Table Of Contents) recorded on the disc includes the start address and end address information of each song recorded on the disc, and the CPU 29 stores the TOC in an internal memory unit (not shown). , And the current address and address information based on the TOC are collated to recognize the currently playing song, and the song No. corresponding to the song is recorded. Is displayed on the display 30.
[0028]
Therefore, according to the double speed search process in a general MD player, several jumps → several units of data reading → several jumps → several units of data reading → ... repeatedly executed, the read data is stored in the DRAM 15. By storing and sequentially outputting the data stored in the DRAM 15 at the time of voice output, a desired song can be quickly searched.
[0029]
[Problems to be solved by the invention]
According to the MD player as the disc player, for example, as shown in FIG. 8, music N-1 up to sector S2, music N from sector S3 to sector S15, music N + 1 from sector S16, etc. are recorded. When the 9x speed search is performed on the recorded disk, the optical pickup 11 reproduces the two sectors of S0 and then executes the four jumps, and after the four jumps, reproduces the two sectors of the sectors S17 and S18. To do.
[0030]
However, as shown in FIG. 8, the optical pickup 11 jumps over the song N from the sector S3 to the sector S15 in the jump by the four jumps moving from the sector S1 to the sector S16, that is, the number of track jumps. When double speed search is executed, there is a problem that music with a short playback time is skipped.
[0031]
When the optical pickup 11 jumps over the short music N by the double speed search in this way, the display 30 shows a music No. corresponding to the short music N. Since the user cannot recognize that the short song N is recorded on the disc, the user performs the double speed search to search for the short song N. There was a problem that a malfunction occurred.
[0032]
The present invention has been made in view of the above-mentioned problems, and its purpose is to search all songs recorded on the disc regardless of how short the playback time is when performing a double speed search. An object of the present invention is to provide a disc player that can do this.
[0033]
[Means for Solving the Problems]
In order to achieve the above object, the present invention records a plurality of pieces of information data composed of a plurality of sectors, and repeatedly performs a predetermined number of track jumps and a predetermined number of sectors of data read from the disc on which the identification of each information data is recorded. A disc player that has a double speed search function for searching each information data recorded on the disc and reproduces the information data recorded on the disc, and reads the information data and the identification of the information data When, and control means for identifying each information data by the identification of the information data, said control means, and an identification of the predetermined number track jump identified as the predetermined number track jump just before the information data immediately after the information data The information track identification immediately after the predetermined number of track jumps The same time the identification of previous information data to execute the repetition of data reading and predetermined number track jump of a predetermined number of sectors, identifying the predetermined number track jump identification immediately following the information data of the information data of the predetermined number track jump just before Is different from the above, the data reading and the predetermined number of track jumps are repeatedly executed from the head of the information data positioned next to the information data immediately before the predetermined number of track jumps on the disk.
[0034]
[Action]
With such a configuration, even when there is an identification range of information data with a short reproduction time in a plurality of information data recorded on the disc at the time of search execution, the disc is recorded on the disc without jumping over the identification range of the short information data. It is possible to search information data of all the recorded identification ranges.
[0035]
【Example】
Hereinafter, an MD player to which a disc player of the present invention is applied will be described with reference to FIGS. The description of the general configuration and operation of the MD player shown in FIG. 1 is omitted because it overlaps with the prior art.
[0036]
According to the MD player to which the disc player of the present invention is applied, all the songs recorded on the disc can be searched regardless of how short the playback time is when performing the double speed search.
[0037]
Now, the operation of the MD player during the double speed search process will be described. FIG. 2 is a flowchart showing the processing operation of the CPU 29 in the double speed search process of the MD player.
[0038]
In FIG. 2, it is determined whether or not the memory capacity of the DRAM 15 is empty (step S11). If the memory capacity of the DRAM 15 is empty, the optical pickup 11 is caused to execute several jumps, for example, four jumps via the servo processing unit 21 and the driver 22 (step S12), and the four Data after jump execution (address + music data) is read by the optical pickup 11 (step S13), and the read address data is collated based on the address information of the TOC stored in the memory unit inside the CPU 29. Then, it is determined whether or not the address data exceeds the range of the music before execution of the four jumps ((N-1) music in FIG. 3) (step S14).
[0039]
If the range of the song ((N-1) th song) is exceeded, the light corresponding to the start address of the next song (Nth song in FIG. 3) immediately after the song jump is based on the address information of the TOC. The pickup 11 is moved (that is, returned), and the optical pickup 11 is accessed at the head of the next song (Nth song) (step S15).
[0040]
Next, the song data of the data of two sectors read in step S13 is stored in the DRAM 15 (step S16), and it is determined whether or not the memory capacity of the DRAM 15 is empty (step S17). . If the memory capacity of the DRAM 15 is free, the process proceeds to step S12.
[0041]
If the memory capacity of the DRAM 15 is not empty in step S11 or step S17, the optical pickup 11 is put in a pause state (step S19).
[0042]
If the song range is not exceeded in step S14, the process proceeds to step S16. Note that the actual audio output processing of the music data stored in the DRAM 15 is performed in parallel with the above processing operation. At this time, the music No. corresponding to the music data being reproduced is recorded. Is displayed on the display 30.
[0043]
Now, the operation state of the optical pickup 11 in the double speed search process shown in the flowchart of FIG. 2 will be specifically described with reference to FIG. FIG. 3 is an explanatory diagram showing an operation state of the optical pickup 11 in the double speed search process in which the music data recorded on the disk in a spiral form is linear for convenience, that is, in units of sectors. In FIG. 3, the operation order in the optical pickup 11 is represented by circle numbers.
[0044]
The disc in FIG. 3 includes songs N-1 up to sector S2, songs N from sector S3 to sector S14, songs N + 1 from sector S15, and the like.
[0045]
When the double speed search process is executed in the sector S0 of the music piece N-1, the CPU 29 executes a four jump to move the optical pickup 11 from the sector S1 to the sector S16, and after executing the four jump, the sector S17. Is read by the optical pickup 11 and the address data of the sector S17 is collated based on the address information of the TOC to recognize that the sector S17 corresponds to the music piece N + 1.
[0046]
The CPU 29 recognizes that the sector S17 is the song N + 1 and the optical pickup 11 has jumped from the song N-1 to the song N + 1 and moves the optical pickup 11 in the sector S17. Based on the address information of the TOC, it is moved to the start address of the song N, that is, the sector S3.
[0047]
Next, the CPU 29 causes the optical pickup 11 to read the music data of the sectors S3 and S4, and stores the read music data of two sectors in the DRAM 15. Next, four jumps are executed from the sector S5. Thus, a series of operations such as .fwdarw..fwdarw.4 jump.fwdarw.number unit data reading.fwdarw.4 jump.fwdarw.number unit data reading.fwdarw.
[0048]
Therefore, according to the MD player in the above embodiment, even if there is a song having a short playback time among a plurality of songs recorded on the disc during the double speed search process, the short song is skipped without skipping the short song. Since the music is played back for a certain time, all the music recorded on the disc can be searched even during the double speed search process.
[0049]
In addition, in the double speed search process, regardless of the start timing of the double speed search process, all songs recorded on the disc are played for a certain time from the beginning for each song. Regardless of the position at which the double speed search is performed on the disc, the same song data is always reproduced, and the user does not feel uncomfortable.
[0051]
In the above embodiment, the double speed search process in the forward direction has been described as an example. Needless to say, the same applies to the double speed search process in the rewind direction.
[0052]
Further, the double speed search process in the above embodiment has been described by taking an example of a nine speed search in which four track jumps and two-time playback are performed in two sectors, but is not limited to this range.
[0053]
Further, in the above-described embodiment, the description has been given taking the MD player as an example for the MD, but the disc player of the present invention can also be applied to a player targeting an optical disc such as a CD or LD. Needless to say.
[0054]
【The invention's effect】
According to the disc player of the present invention configured as described above, even when there is an identification range of information data having a short reproduction time in a plurality of information data recorded on the disc at the time of executing search, the short information Information data of all identification ranges recorded on the disc can be searched without skipping the data identification range.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a schematic configuration of a control unit that controls a general MD player and a signal processing unit.
FIG. 2 is a flowchart showing a processing operation of a CPU in a double speed search process of an MD player to which the disc player of the present invention is applied.
FIG. 3 is an explanatory diagram showing an operation state of an optical pickup in a double speed search process of an MD player to which the disc player of the present invention is applied.
FIG. 4 is a plan view showing a configuration of a general MD.
FIG. 5 is an explanatory diagram simply showing movement of an optical pickup in a double speed search process of a general MD player.
FIG. 6 is an explanatory diagram showing an operation state of an optical pickup in a double speed search process of a general MD player.
FIG. 7 is an explanatory diagram for comparing a playback time during normal playback required for the same number of sectors of a general MD player with a playback time during double speed search processing;
FIG. 8 is an explanatory diagram showing an operation state of an optical pickup that directly represents a defect in a double speed search process of a general MD player.
[Explanation of symbols]
11 Optical pickup (reading means)
29 CPU (control means)
300 discs (MD; minidisc)

Claims (1)

Each information data recorded on the disc is recorded by recording a plurality of information data composed of a plurality of sectors, repeatedly performing a predetermined number of track jumps and reading a predetermined number of sectors on the disc on which the identification of each information data is recorded. A disc player that has a double speed search function for retrieving information and reproduces information data recorded on the disc,
Reading means for reading the information data and the identification of the information data ;
And control means for identifying each information data by the identification of the information data,
The control means, said predetermined number track jump collates the identification information data of the predetermined number track jump just before the identification immediately following the information data, said predetermined number track jump identification immediately after the information data the predetermined number track jump When it is the same as the identification of the immediately preceding information data, the data reading of the predetermined number of sectors and the repetition of the predetermined number of track jumps are executed, and the identification of the information data immediately after the predetermined number of track jumps is the identification of the information data immediately before the predetermined number of track jumps And a disc player characterized by repeatedly reading data and executing a predetermined number of track jumps from the head of the information data positioned next to the information data immediately before the predetermined number of track jumps on the disc.

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