JP2003123381A - Device and method for reproducing disk, memory control program and recording medium recording memory control program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reproduce data without stop even in the memory of small capacity when reproducing the streaming data of large capacity recorded on an optical disk or the like. SOLUTION: A disk reproducing device is provided with a memory 23 for temporarily storing the streaming data such as animation data reproduced from an optical disk 10. The storage area of this memory 23 is divided into a head cache part 24 capable of storing a data amount equivalent to a maximum seek execution time at least and caching data in the head of the streaming data read out of the optical disk 10 and a ring buffer part 25 for buffering data after the head portion in the form of ring. Then, a CPU 22 controls the write and read of the head cache part 24 and the ring buffer part 25 and performs control so that data can be successively read from the data cached in the head cache part 24 during seek execution.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk reproducing apparatus and method for reproducing a disk medium on which continuous data such as moving images and sounds are recorded, a memory control program suitable for the disk reproducing apparatus, and a memory control program therefor. The present invention relates to a recording medium that records

[0002]

2. Description of the Related Art A disc reproducing apparatus for reproducing an optical disc on which streaming data such as moving image and sound data is recorded has a memory for buffering the streaming data read from the optical disc. Many.

This memory is used as a ring buffer, and by circulating the address control of writing and reading of the buffer area in a ring shape, for example, a large amount of streaming data read from an optical disc can be stored.
It is provided so that it can be reproduced without interruption.

[0004]

Now, let us consider the operation when the disc reproducing apparatus repeatedly reproduces, for example, streaming data in a loop form from the optical disc. Note that the method of repeatedly playing streaming data is, for example, when displaying a moving image of a wave moving on the water surface, by repeatedly connecting a moving image of a short time in a loop to create a pseudo long It is used when expressing moving images of continuous waves.

More specifically, the disc reproducing apparatus reproduces the streaming data by writing the streaming data read from the optical disc into the ring buffer and reading the streaming data as a loop reproduction of the first round. Here, when the data amount of the streaming data is larger than the storage capacity of the ring buffer, the disk reproducing device sequentially overwrites the ring buffer with data that exceeds the storage capacity,
The above streaming data is repeatedly reproduced without interruption. Then, after the reproduction of the streaming data of the first round is completed next time, when the streaming data of the second round is reproduced next, the disc reproducing apparatus moves to the track where the head of the streaming data is recorded. The optical pickup is moved (seek), and tracking servo and focus servo are applied to start reading the streaming data from the optical disc.
The streaming data is newly written in the ring buffer and then read out.

That is, according to the conventional disc reproducing apparatus, it takes time until the reproduction of the streaming data of the second round is started after the reproduction of the streaming data of the first circle is completed, and as a result, the streaming data is reproduced. However, there is a problem in that the playback of is temporarily interrupted (in the case of moving images, it is like dropped frames). If a large-capacity memory capable of storing a plurality of streaming data is installed in the disc reproducing apparatus, it is possible to prevent the data interruption during the seek. However, such a large-capacity memory is expensive, and the memory installation area inside the disk reproducing device also becomes large. For this reason, there is a demand for a disk reproducing apparatus that can use the inexpensive and small-sized small-capacity memory to eliminate the above-mentioned data interruption.

The present invention has been made in view of the above problems, and has a small capacity when a large amount of streaming data recorded on a disk medium such as an optical disk is repeatedly reproduced in a loop. A disc reproducing apparatus and method capable of reproducing data without interruption even in a memory, a memory control program for the disc reproducing apparatus,
It is an object to provide a recording medium having the memory control program recorded therein.

[0008]

SUMMARY OF THE INVENTION According to the present invention, at least a seek execution time is required for data at the beginning of streaming data read from a disk-shaped recording medium on which a plurality of streaming data to be continuously reproduced are recorded. The amount of data corresponding to the minute is cached, and the rest of the data except for the leading part is buffered in a ring shape. Then, during the seek operation of the data read head, the cached data is sequentially read.

That is, according to the present invention, after the reproduction of a certain streaming data is finished, while the seek of the data read head is being performed in order to read the next streaming data from the disk-shaped recording medium, the data of the head portion which is cached is cached. Is read to compensate the continuity of the data until the reading of the next streaming data is started.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a schematic internal structure of an optical disk reproducing apparatus according to an embodiment of the present invention.

In FIG. 1, the optical disk 10 is chucked by a chucking member (not shown) provided at the tip of the rotary shaft of the spindle motor 11, and is rotationally driven by the spindle motor 11. It is assumed that a plurality of streaming data A, B, C, ... Are recorded on the optical disc 10 in order as shown in FIG. Further, it is assumed that the data amounts of the streaming data A, B, C, ... Are the same or different. In the present embodiment, it is assumed that compression-coded moving image and audio (including audio) data is recorded on the optical disc 10 as the streaming data A, B, C ,. Further, in the case of the present embodiment, each streaming data A, B, C, ... Can reproduce a continuous moving image or sound for a pseudo long time by repeatedly reproducing each in a loop. And

The slide feed mechanism 12 comprises, for example, a sled mechanism including a rack extending along the radial direction of the optical disk 10 and a gear meshing with the rack, and a sled motor (stepping motor) for rotating the gear. The optical pickup (data reading head) 13 is moved in the radial direction of the optical disc 10 according to the rotation amount of the sled motor.

The optical pickup 13 is provided with a laser light source such as a laser diode, a light receiving surface of a predetermined pattern, a photodetector (photoelectric conversion element) for converting the intensity of incident light into an intensity of voltage, and the laser beam for the optical disc 1.
The optical system is provided with an optical system for converging and irradiating the recording surface of 0 and guiding the reflected light from the recording surface to the light receiving surface of the photodetector, and an objective lens included in the optical system.
It is composed of a biaxial actuator or the like (not shown) that moves in a direction parallel to and perpendicular to the recording surface. The output signal of the optical pickup 13 is sent to the RF amplifier 14.

The RF amplifier 14 is the optical pickup 1 described above.
Correcting the level and frequency characteristics of the output signal of 3 and DS
P (digital signal processor) 19 is sent. Also, R
The F amplifier 14 sends the output signal of the optical pickup 13 to the mechanical controller 18.

The mechanical controller 18 detects a focus error component and a tracking error component from the output signal of the optical pickup 13 via the RF amplifier 14,
A focus servo signal and a tracking servo signal are generated based on these error components and sent to the biaxial actuator drive unit 15. The mechanical controller 18 also generates a spindle motor rotation control signal for rotating the spindle motor 11 at a constant or variable rotation speed, and sends the spindle motor rotation control signal to the spindle motor drive unit 17. Also,
The mechanical controller 18 generates a sled motor rotation control signal for rotating the sled motor of the slide feeding mechanism 12 and sends the sled motor rotation control signal to the slide feeding mechanism 12 to control the feeding operation and the seek operation of the optical pickup 13.

The biaxial actuator drive section 15 drives the biaxial actuator of the optical pickup 13 based on the focus servo signal and the tracking servo signal from the mechanical controller 18. Further, the sled motor driving unit 16 drives the sled motor of the slide feed mechanism 12 based on the sled motor rotation control signal from the mechanical controller 18. The spindle motor drive unit 17 drives the spindle motor 11 based on the spindle motor rotation control signal from the mechanical controller 18.

The DSP 19 binarizes the signal from the RF amplifier 14 and further performs signal demodulation processing, error correction processing, decoding processing and the like to obtain reproduced data. The reproduction data is temporarily buffered in the memory 23 and then sent to the output interface unit 20. The detailed configuration and operation of the memory 23 will be described later.

The output interface section 20 generates a signal of a predetermined standard from the reproduction data and outputs it from the terminal 21. In the case of the present embodiment, if the streaming data A, B, C, ... Are moving image and audio data, and a television receiver is connected to the terminal 21, the output interface unit 20 outputs the data. Is NT
A signal of a standard television broadcasting system such as the SC system (or PAL system) is output as a signal of the above-mentioned predetermined standard.

The CPU 22 controls the overall operation of the optical disc reproducing apparatus and controls writing and reading of the memory 23 as necessary. In addition, writing and reading of the memory 23 is performed by DMA (Direct M
You can also use emory Access).

[Memory Configuration and Operation] In the optical disc reproducing apparatus according to the present embodiment, the memory 23 has an area for temporarily storing (buffering) the reproduced data generated by the DSP 19. The area is further divided into a head cache unit 24 and a ring buffer unit 25. The head cache unit 24 is
It has a storage capacity of at least the total data amount when data is continuously read at a constant rate without interruption for at least the maximum time from the start of seek of the optical pickup 13 to the focus and tracking servo. It should be noted that in the present embodiment, the top cache unit 2
For example, the capacity of 4 is 256 Kbytes, and similarly, the capacity of the ring buffer unit 25 is 256 Kbytes. Further, in the example of FIG. 1, the storage area of the memory 23 is divided into the head cache unit 24 and the ring buffer unit 25, but the head cache unit 24 and the ring buffer unit 25 may be memories having different configurations.

Here, for example, when the first streaming data A read from the optical disc 10 is written in the memory 23, the optical disc reproducing apparatus of the present embodiment stores the memory 23 in the initial state in which no data is stored.
On the other hand, data is sequentially written from the first address CH of the leading cache unit 24, and after the leading cache unit 24 is full, data is further written from the first address RH of the ring buffer unit 25.

When reproducing the streaming data A, the optical disk reproducing apparatus reads the data sequentially from the first address CH of the head cache unit 24, and then reads the last data in the ring buffer unit 25. , The read position is returned to the first address CH of the head cache unit 24,
Perform the above playback.

When the data amount of the streaming data A is larger than the total capacity of the head cache unit 24 and the ring buffer unit 25 of the memory 23, the optical disk reproducing apparatus of this embodiment has the head cache unit 24.
The data after the data (the data at the beginning of the streaming data A) stored in the
The streaming data A is reproduced while the ring-shaped data is written and read only within 5, and the data stored in the head cache unit 24 is not destroyed (overwritten).

Next, when the reproduction of the streaming data A of the second cycle is started after the reproduction of the streaming data A of the first cycle is completed, the streaming data A is reproduced by the optical disk reproducing apparatus of the present embodiment. The optical pickup 13 is sought on the track where the beginning of A is recorded, and tracking servo and focus servo are further applied, and then the reading of the streaming data A is started.

At this time, the streaming data A for the first round remains in the memory 23, and the data of the leading portion of the streaming data A for the first round is cached in the head cache unit 24. Therefore,
The optical disk reproducing apparatus of the present embodiment reads out the data of the head portion of the first round cached in the head cache unit 24 during the execution of the seek. That is, according to this embodiment, the head cache unit 24 is
As described above, since at least the amount of data corresponding to the seek time and the time until the servo lock is cached, the reproduction of the streaming data A is not interrupted even during the seek and the servo lock.

Further, as described above, the head cache unit 24
When the data of the leading portion of the streaming data A of the first round is read from, the optical disc reproducing apparatus of the present embodiment, the streaming data A of the second round, which starts reading from the optical disc 10 after the seek.
Are sequentially written to the head cache unit 24 from the first address CH, and after the head cache unit 24 is full, the ring buffer unit 25 is further filled.
Data is sequentially written from the first address RH.

After that, when reproducing the streaming data A for the second round, the optical disk reproducing apparatus sequentially reproduces the data from the first address CH of the leading cache unit 24, as in the case of the streaming data A for the first round. After reading the data and further reading the last data in the ring buffer unit 25, the first cache unit 2
Playback is performed by returning the read position to the first address CH of No. 4.

The same applies to each streaming data after the streaming data B, and the description thereof will be omitted.

[Example in which a plurality of head cache units and ring buffer units are provided] In the present embodiment, the memory 2
Head cache unit 24 and ring buffer unit 25 in 3
It is also possible to provide a plurality of.

Here, for example, two sets of a first buffer section composed of a head cache section and a ring buffer section and a second buffer section composed of a head cache section and a ring buffer section are prepared. Using the buffer unit of 2, the streaming data A is repeatedly reproduced in a loop, the streaming data B is repeatedly reproduced in a loop, and the streaming data A is repeatedly reproduced in a loop. Let's consider the case of reproducing data.

The optical disk reproducing apparatus in this case first repeatedly reproduces the streaming data A in a loop using the first buffer unit, and then repeatedly reproduces the streaming data B in a loop using the second buffer unit. To do. Then, when reproducing the streaming data A again, the optical disk reproducing device reads the data of the head portion of the streaming data A cached in the head cache unit 24 of the first buffer unit. As a result, the optical disk reproducing device can immediately start reproducing the streaming data A.
Further, the head cache unit 24 of the first buffer unit
While reading data from, the optical disk reproducing apparatus seeks the optical pickup 13 to the position where the streaming data A is recorded. As a result, the optical disk reproducing device can continue to reproduce the streaming data A without interruption.

Further, according to the optical disc reproducing apparatus having the first and second buffer sections as described above, for example, while the streaming data A stored in the first buffer section is being read, By reading the streaming data B from the optical disc 10 and writing it in the second buffer unit, it is possible to switch to the streaming data B for reproduction during the reproduction of the streaming data A, for example.

As described above, in the optical disc reproducing apparatus of the present embodiment, the head cache unit 24 and the ring buffer unit 25 are provided in the storage area of the memory 23, and the head cache unit 24 stores the head portion of the streaming data. Then, when the streaming data is repeatedly reproduced in a ring shape, only the data after the head portion is written and read in a loop shape in the ring buffer unit 25 to destroy the data stored in the head cache unit 24. By not doing so, the data can be reproduced without interruption even during seek execution.

[Other Configuration Example] The memory control as described above in the present embodiment can of course be realized by software (application program such as a computer).

3 and 4 show the configuration and operation when the memory control of this embodiment is realized on a computer. FIG. 3 shows a configuration example of the main part of the computer,
FIG. 4 shows the flow of processing when the CPU 123 of the computer shown in FIG. 3 executes a computer program (memory control program) that realizes the memory control of this embodiment.

First, the structure of FIG. 3 will be described.

In FIG. 3, the storage unit 126 is composed of, for example, a rewritable nonvolatile memory, a hard disk, or the like. In the storage unit 126, an operating system program, such as a CD-ROM or a DVD-ROM, is stored.
A computer program (memory control program) 127 for implementing the memory control of the present embodiment by software, which is loaded from an optical disk such as the above, or loaded via a communication line, and other various data 128 are stored.

The communication unit 121 is, for example, a modem for connecting to an analog public telephone line, a cable modem for connecting to a cable television network, a terminal adapter for connecting to ISDN (Integrated Digital Communication Network), and ADSL ( Asymmetric Digital Subscriber Line)
It is a communication device for performing data communication with the outside, such as a modem for connecting to, a wireless data communication device, and the like. The communication I / F unit 122 is an interface device that performs protocol conversion and the like for enabling data exchange between the communication unit 121 and the internal bus (BUS).

The input unit 133 is an input device such as a keyboard, a touch pad, or a pressure-sensitive tablet for pen input, and the user I / F unit 132 is the input unit 133.
It is an interface device for supplying a signal from the inside.

The drive unit 135 is, for example, a CD-ROM.
It is a drive device capable of reading various programs and data from an optical disc 138 such as a DVD-ROM or a semiconductor memory such as a card. Drive I / F section 1
Reference numeral 34 is an interface device for supplying the signal from the drive unit 135 to the inside.

The display unit 137 is a display device such as a liquid crystal display, and the display drive unit 136 is the display unit 137.
Is a drive device for driving the display.

The ROM 124 is composed of a rewritable non-volatile memory such as a flash memory, and stores a BIOS (Basic Input / Output System) of the computer and various initial setting values.

The RAM 125 is loaded with the application programs and various data read from the storage unit 126, and is also used as a work RAM of the CPU 123. In the case of this example, the RAM 125 is also used as the head cache unit and the ring buffer unit described above.

The CPU 123, based on the operating system program stored in the storage unit 126 and the computer program 127 of this embodiment,
Controls all operations of the personal computer, and
Address control of writing and reading of the head cache unit and ring buffer unit formed on the RAM 125 is performed, and control of reading streaming data from the optical disc 138 and decoding of the read streaming data are also performed. .

Next, C of the computer shown in FIG.
A flow of processing when the PU 123 operates based on the computer program (memory control program) 127 of this embodiment will be described with reference to FIG.

In FIG. 4, as the processing of step S1, the CPU 123 first sets and initializes the head cache section and the ring buffer section in the storage area of the RAM 125.

Next, the CPU 123 starts reading the streaming data from the optical disc 138 as the process of step S2.

Next, the CPU 123 sequentially writes the streaming data read from the optical disk 138 into the head cache section and the ring buffer section provided in the RAM 125 as the processing of step S3.

Next, the CPU 123 reproduces the streaming data by sequentially reading the data stored in the head cache section and the ring buffer section in the RAM 125 as the processing of step S4. At this time, when the data amount of the streaming data is larger than the total capacity of the head cache unit and the ring buffer unit of the RAM 125, the ring-shaped writing and reading are performed only within the ring buffer unit.

Next, the CPU 123 determines whether or not to perform loop reproduction of the streaming data as the processing of step S6, and when performing loop reproduction, step S7.
If the loop reproduction is not performed, the process ends. When there is streaming data to be loop-reproduced next, the processing of the flowchart of FIG. 4 is performed on the next streaming data.

When it is determined in step S6 that the loop reproduction is to be performed and the process proceeds to step S7, the CPU 123 determines that RA
While reading the data from the head cache unit of M125, the seek to the track position where the head of the streaming data to be loop-played is recorded is performed. When the seek is completed in this step S7, the CPU 123 returns the processing to step S2, and thereafter performs the above-mentioned processing for the streaming data.

The memory control according to the present embodiment as described above is not limited to the case where the memory capacity is originally small as in a portable computer, but is also applicable to a computer having a large capacity memory, for example. It is considered to be effective even when the memory capacity that can be used when playing back a moving image is running low.

The above description of the embodiment is an example of the present invention. Therefore, the present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made according to the design and the like as long as they do not depart from the technical idea of the present invention. . For example, the present embodiment is applicable not only to the optical disk reproducing device, the personal computer, and the portable computer, but also to various devices such as a video game machine and a DVD reproducing device having an optical disk reproducing function.

[0054]

INDUSTRIAL APPLICABILITY According to the present invention, when a large amount of streaming data recorded on a disc-shaped medium such as an optical disc is repeatedly reproduced and the next streaming data is reproduced, the present invention can break even a small-capacity memory. It is possible to play streaming data without.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of an optical disc reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram showing an example of streaming data recorded on an optical disc.

FIG. 3 is a block diagram showing a schematic configuration of a computer that realizes memory control according to the present embodiment.

FIG. 4 is a flowchart showing a flow of processing when the memory control of the present embodiment is realized by a computer.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Optical disk, 11 ... Spindle motor, 12 ... Slide feed mechanism, 13 ... Optical pickup, 14 ... RF amplifier, 15 ... Biaxial actuator drive section, 16 ... Sled motor drive section, 17 ... Spindle motor drive section, 18
... mechanical controller, 19 ... DSP, 20 ... output interface section, 22 ... CPU, 23 ... memory, 24 ... head cache section, 25 ... ring buffer section

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ identification code FI theme code (reference) G11B 7/005 G11B 7/005 Z 5D090 27/10 27/10 A G11C 7/00 318 G11C 7/00 318B (72) Inventor Makoto Igamine 7-1-1, Akasaka, Minato-ku, Tokyo F-term in Sony Computer Entertainment Inc. (reference) 5B060 AB20 5B065 BA03 CE12 5B082 FA12 5D044 AB07 BC02 CC04 DE39 FG10 GK12 HH05 5D077 AA23 BA01 BB16 CA02 DC03 EA12 FA08 5D090 AA01 BB04 CC04 DD03 FF02 FF05 FF30

Claims (5)

[Claims] 1. A disk reproducing apparatus for reproducing a disk-shaped recording medium in which a plurality of streaming data to be continuously reproduced are recorded, and at least a data amount corresponding to a maximum seek execution time of a data reading head is stored. A head cache unit that has a capacity and caches the data at the beginning of the streaming data read from the disc-shaped recording medium, and buffers the remaining data excluding the beginning from the streaming data, and at the same time acts as a ring buffer. The ring buffer unit to be used and the writing and reading of the head cache unit and the ring buffer unit are controlled, and during the seek operation of the data read head, the data read from the cache unit of the head cache unit is sequentially read. A disc reproducing apparatus having a control section. 2. The disk reproducing apparatus according to claim 1, wherein a plurality of sets of the head cache unit and the ring buffer unit are provided, and streaming data is cached and buffered for each set. Disc player. 3. A disc reproducing method for reproducing a disc-shaped recording medium on which a plurality of streaming data to be consecutively reproduced are recorded, in order from a head portion of the streaming data read from the disc-shaped recording medium, At least an amount of data equivalent to the seek execution time of the data read head is cached, and the remaining data excluding the above head part from the streaming data is buffered in a ring shape. A disk reproducing method, wherein the cached data is sequentially read. 4. Data of a leading portion of streaming data read from a disc-shaped recording medium on which a plurality of streaming data to be continuously reproduced are recorded,
A head cache step that caches at least the amount of data equivalent to the seek execution time of the data read head, a ring buffer step that buffers the remaining data excluding the head portion from the streaming data in a ring shape, and the data read A memory control program for causing a computer to execute a memory reading step of sequentially reading from the cached data during a seek operation of the head. 5. The data at the beginning of the streaming data read from a disk-shaped recording medium on which a plurality of streaming data to be continuously reproduced are recorded,
A head cache step that caches at least the amount of data equivalent to the seek execution time of the data read head, a ring buffer step that buffers the remaining data excluding the head portion from the streaming data in a ring shape, and the data read A recording medium recording a memory control program for causing a computer to execute a memory reading step of sequentially reading from the cached data during a seek operation of the head.