JP2003242708A - Information recording disk player - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technique for achieving power consumption reduction and noise reduction by controlling the revolution speed of an information recording disk corresponding to a transfer speed. <P>SOLUTION: The information recording disk 103 is evaded from falling into a pose state by controlling the revolution speed of the information recording disk 103 corresponding to the setting of a transfer kind from a host computer 101 or a decoded information amount stored in a buffer 106. Also, by handling the revolution speed of the information recording disk 103 or performing retrial corresponding to the number of errors included in decoded information, read reliability is improved. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc reproducing apparatus for reading information from an information recording disc, for example, a CD.
-ROM drive, CD-R / RW drive, DVD-
ROM drive, DVD-RAM drive and DVD-R
/ RW The present invention relates to a technique for reproducing information from a disc such as a drive.

[0002]

2. Description of the Related Art When a DVD-ROM drive is played back, the host computer reads the information from the DVD-ROM drive.
The transfer types that can be used with the ROM drive are DVD-
Set to ROM drive. The transfer type includes, for example, a transfer method and a transfer mode. Also, DVD-RO
In order to quickly read out necessary information from the information recording disc, the M drive increases the reproduction speed of the disc to the maximum number of revolutions when reading the information from the information recording disc and reads the information.

Conventionally, when reproducing information from an information recording disk reproducing apparatus, the host computer is a DVD-RO.
Information on transfer types that can be set in the DVD-ROM drive is acquired from the M drive. The transfer type is, for example, Programmed Input / Out (hereinafter referred to as PIO transfer) mode 4 or Multi WordDi.
rect Memory Access transf
This is information such as er (hereinafter, multi-word DMA transfer) mode 2. The host computer selects a transfer type operable by both the host computer and the DVD-ROM drive, and the DVD-ROM drive stores information on the transfer type instructed by the host computer in the RAM connected to the microprocessor. To do.

Next, the host computer gives the DVD-ROM drive the information necessary for reading, for example, the recording position and the length of the information to be read on the information recording disk, and reads the information from the information recording disk. Give instructions. Based on the instruction from the host computer, the microprocessor executes a program for reading information from the information recording disk among the programs stored in the ROM. As a specific procedure, when reproducing information from the disc, the microprocessor instructs the reproduction speed control unit to rotate the information recording disc at the lowest speed or at the highest speed when the information recording disc is stopped. , And instructs the information recording disk reading device to read.

After the information recording disk reading device starts reading the information from the information recording disk, the microprocessor decodes the information read by the information recording disk reading device to the decoder into a format which can be transferred to the host computer. The decoder instructs the processing to be performed, and the decoder uses the buffer to perform the decoding processing of the read information. The microprocessor transfers the information for which the decoding processing by the decoder is completed to the host computer according to the transfer type stored in the RAM. Thus, the conventional DVD-RO
In the M drive, since it takes time to perform random access for reading from an arbitrary position of the information recording disk using the information recording disk reading device, the information recording disk is rotated at the highest speed regardless of the transfer type to the host computer. I was reading it.

[0006]

Therefore, in the DVD-ROM drive according to the above-mentioned prior art, since the information recording disk is rotated at the highest speed, the host computer is transferred at a transfer speed slower than the read speed of the information recording disk. If the buffer is full, the information recording disk is paused and reading from the information recording disk is stopped when the buffer is full. As a state, I had to wait until there was room in the buffer. During that time, electric power is wasted due to the rotation of the information recording disk, and meaningless noise is generated.

On the other hand, in recent years, DVD-ROM drives have been rapidly spreading to video software reproduction. In reading in this case, since the information recording disk reading device advances the information recording disk from the inner diameter to the outer diameter in one direction, the reading speed and the transfer speed are becoming competitive. Further, a multi-beam reproducing technique for performing reading by using a plurality of laser beams is being put into practical use as a technique for increasing the reading speed of a DVD-ROM drive device. Against this background, it is expected that the read speed will exceed the transfer speed in the future, and power consumption due to rotation of the information recording disk or noise reduction of the DVD-ROM drive device compatible with video / audio software will be reduced. , It is expected to gradually close up.

The object of the present invention is to solve the above problems,
An object of the present invention is to provide a technique for achieving low power consumption and low noise by controlling the rotation speed of an information recording disk according to the transfer speed.

[0009]

In order to achieve the object of the present invention, in the first invention, an information recording disk reproducing apparatus comprises an information recording disk reading means for reading information from an information recording disk, and the information recording disk. Reproduction speed control means for controlling the reproduction speed when reading the information recorded on the recording medium, a decoding device having a buffer for decoding the read information, and an information transfer means for transferring the decoded information to the outside. The reproduction speed control means controls the reproduction speed from the information recording disk so that the transfer rate corresponds to the transfer type of the information transfer means.

According to a second invention, in the first invention, the maximum linear velocity at the time of reading the information stored in the information recording disk is calculated based on the transfer rate of the transfer type, and the information recording disk is read. The linear velocity at the reading position of the means is calculated, and the linear velocity at the reading position is controlled by the reproduction speed control means to be equal to or less than the maximum linear velocity.

In a third aspect based on the first aspect, the reproduction speed of the reproduction speed control means is controlled according to the amount of information stored in the buffer provided in the decoding device.

According to a fourth invention, in the first invention, the presence or absence of an error at the time of decoding by the decoding device is judged,
Either the reproduction speed of the reproduction speed control means is controlled or the information recording disk reading means is made to read the information from the information recording disk again based on the number of errors.

In a fifth aspect based on the first aspect, the maximum linear velocity at the time of reading the information stored in the information recording disc is calculated based on the transfer rate of the transfer type, and the information recording disc reading is performed. Calculating a linear velocity at the reading position of the means, controlling the reproducing velocity control means so that the linear velocity at the reading position becomes substantially the maximum linear velocity, and a buffer provided in the decoding device. When the amount of information stored in is equal to or larger than the predetermined value, the reproduction speed of the reproduction speed control means is reduced.

In a sixth aspect based on the first aspect, the maximum linear velocity at the time of reading the information stored in the information recording disc is calculated based on the transfer rate of the transfer type, and the information recording disc is read. The linear velocity at the reading position of the means is calculated, the linear velocity at the reading position is controlled by the reproduction speed control means so as to be substantially the maximum linear velocity, and the decoding speed is controlled by the decoding device. Whether or not there is an error is determined, and when the number of errors is equal to or greater than a predetermined value, control is performed to reduce the reproduction speed of the reproduction speed control means, or the information recording disk reading means reads the information recording disk from the information recording disk. Either read the information again.

In a seventh aspect based on the first aspect, when the amount of information stored in the buffer provided in the decoding device is equal to or more than a predetermined value, the reproduction speed of the reproduction speed control means is reduced. Determining whether or not there is an error at the time of decoding by the decoding device, and controlling the reproduction speed of the reproduction speed control means when the error occurrence number is a predetermined value or more,
Alternatively, either the information recording disc reading means is made to read the information from the information recording disc again.

In an eighth aspect based on the first aspect, the maximum linear velocity at the time of reading the information stored in the information recording disc is calculated based on the transfer rate of the transfer type, and the information recording disc is read. Calculating a linear velocity at the reading position of the means, controlling the reproducing velocity control means so that the linear velocity at the reading position becomes substantially the maximum linear velocity, and a buffer provided in the decoding device. If the amount of information stored in the above is a predetermined value or more, the reproduction speed of the reproduction speed control means is reduced, the presence or absence of an error at the time of decoding by the decoding device is determined, and the error occurrence number is a predetermined value. In the above case, the reproduction speed of the reproduction speed control means is controlled, or the information recording disk reading means is made to read the information from the information recording disk again. Do one of the.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings using examples. FIG. 1 is a block diagram showing an embodiment of an information recording disk reproducing apparatus according to the present invention, showing a DVD-ROM drive. When reproducing information from the information recording disk reproducing apparatus, the host computer 101 operates the DVD-ROM drive 102 to the D
Information about transfer types that can be set in the VD-ROM drive 102 is acquired, and the host computer 101 and the DVD
-Select a transfer type that can be operated by both the ROM drive 102 and store it in the RAM 110.

Next, the host computer 101 supplies the DVD-ROM drive 102 with information necessary for reading, for example, the recording position and length of the information to be read on the information recording disk, and the information from the information recording disk 103. To read. This host computer 101
Based on the instructions from the microprocessor 104,
The information reading program stored in the ROM 105 is executed.

When the information recording disk reading device 108 starts reading information from the information recording disk 103, the microprocessor 104 instructs the decoder 109 to perform a decoding process. Decoder 109 is buffer 1
Using 06, the read information is decrypted into a format that can be transferred to the host computer 101. The microprocessor 104 transfers the information for which the decoding processing by the decoder 109 is completed to the host computer 101 according to the transfer type stored in the RAM 110.

Hereinafter, with reference to FIG.
The reproduction processing operation of the ROM drive will be described. Figure 2
3 is a flow chart showing a first embodiment of a reproduction processing operation in the information recording disk reproducing apparatus according to the present invention.
In this embodiment, reading information from the information recording disc is performed using Constant Angular Velocity.
A procedure for controlling the rotation speed of the DVD-ROM drive according to the transfer speed will be described assuming that the reproduction is performed by the ty (hereinafter, CAV) reproduction method. The CAV method is a method of rotating an information recording disk at a constant angular velocity, and the information reading speed is different between the inner circumference and the outer circumference of the information recording disk 103.
Specifically, for example, when the inner circumference is rotating at standard speed (1 × speed), the reading speed at the outermost circumference is about 2.5 times.

In FIG. 2, in step 201, the transfer method preset from the host computer 101 and stored in the RAM 110 is acquired. The transfer method is, for example, PIO transfer or multi-word DMA transfer.
In step 202, the transfer mode stored in the RAM 110 is acquired. The transfer mode indicates a transfer rate determined for each transfer method. For example, in the case of multiword DMA transfer, the transfer rate is about 4.16 [MB / s] in mode 0 and about 13.16 in mode 1. 33 [M
B / s], and mode 2 shows about 16.67 [MB / s].

In step 203, the reproduction speed, which is the linear velocity (Rn) at the outermost circumference of the information recording disk, corresponding to the transfer rate determined based on the transfer method and transfer mode acquired in steps 201 and 202 is calculated. . For the calculation method, for example, a table value calculated in advance as shown in FIG. 3 is referred to.

FIG. 3 is a table showing the maximum linear velocity ratio for each transfer type, and FIG. 4 is a table showing the approximate maximum linear velocity ratio for each transfer type. FIG. 3 shows the ratio of the linear velocity at the outer circumference of the disc to the linear velocity at the innermost circumference of the disc for each mode in the transfer system (outermost linear velocity of the disc / inner circumferential linear velocity of the standard speed).
That is, the linear velocity at the inner circumference of the disc is the ratio of the linear velocity at the outermost circumference of the disc to the standard velocity (1 × speed), and is, for example, PI.
In the O transfer mode 0, the speed is 2.5 times, and in the multiword transfer mode 2, the speed is 12.4 times. The information recording disk 103 is rotated so as to have such a ratio. Further, in order to simplify the processing of the reproduction speed control unit 107, a value obtained by rounding the value shown in FIG. 3 as shown in FIG. 4 may be used.

Next, returning to FIG. 2, the description will be continued. In step 204, the current maximum linear velocity at the outermost circumference stored in the RAM 110 is acquired. The CAV method described in this embodiment corresponds to the reproduction speed at the outermost circumference. In step 205, the host computer 101 waits for an instruction to read the information recording disk 103. The read instruction includes, for example, a read start position and a read length, or a read start position and a read end position.
In step 206, the linear velocity (R
Calculate c). The linear velocity at the reading start position is calculated, for example, from the current maximum linear velocity at the outermost circumference of the disc acquired in step 204 and the position of the information recording disc reading device 108 with respect to the information recording disc 103. In step 207, the maximum linear velocity (Rn) of the outermost circumference of the disc calculated in step 203 and step 206
The linear velocities (Rc) at the read position calculated in step 3 are compared. When the linear velocity (Rc) at the read position is less than or equal to the maximum linear velocity (Rn), the process proceeds to step 209. If the linear velocity (Rc) at the read position is higher than the maximum linear velocity (Rn), the information recording disk 103 is unnecessarily rotated, so to prevent this, step 208
Then, the linear velocity at the read position is reduced to the current maximum linear velocity (linear velocity at the outermost periphery of the disc) acquired in step 204. That is, Rc is reduced to be equal to Rn.

In step 209, the reproduction speed control unit 107 is instructed of the rotation speed corresponding to the linear speed at the read position. In step 210, the information recording disk reading device 108 is instructed to read information from the information recording disk 103. In step 211, the decoder 109 is instructed to start decoding. The decoder 109 performs a decoding process into a format in which the information read from the information recording disk 103 by the information recording disk reading device 108 can be transferred to the host computer 101. In step 212, the decoder 1
It waits for the completion of the decoding process of 09, and when the decoding process is completed, the process proceeds to step 213.

At step 213, the information for which the decoding process is completed is transferred to the host computer 101. The transfer to the host computer 101 at this time is step 20.
1 and the transfer method and transfer mode acquired in step 202. In step 214, the host computer 101
It is determined whether or not all the requested information has been read. When the reading and transfer are all completed, the processing ends.

When the reading and the transfer are not completed, the routine proceeds to step 215, where the states of the linear velocity (Rc) and the maximum linear velocity (Rn) are judged. If the linear velocity at the current read position has reached the maximum linear velocity, the process proceeds to step 210, and the next information read instruction is issued. If the linear velocity at the current read position has not reached the maximum linear velocity, step 2
Proceeding to 06, the linear velocity at the next read position is calculated.

According to this embodiment, the host computer 1
The maximum linear velocity (Rn) at the outer circumference of the disk corresponding to the maximum transfer rate instructed from 01 and the linear velocity (Rc) at the read position are compared. If Rc is larger than Rn, the information reproduction amount is the transfer rate. To be more
Since the information recording disk 103 is unnecessarily rotated, the reproduction speed control unit 107 controls the rotation of the information recording disk 103 so as to reduce the linear velocity at the reproduction position until Rc becomes equal to Rn. If the linear velocity (Rc) at the playback position is less than the maximum linear velocity (Rn), the playback speed is less than the transfer rate, and the information is not efficiently played. Therefore, Rc becomes Rn. Then, the rotation speed of the information recording disk 103 is increased. This can reduce wasteful power consumption and noise.

Next, with reference to FIG. 5, a second embodiment of the present invention will be described in which the number of revolutions of the information recording disk is controlled according to the amount of information in the buffer 106 involved in the decoding process.
FIG. 5 is a flowchart showing a second embodiment of the reproduction processing operation in the information recording disk reproducing apparatus according to the present invention. The procedure from step 201 to step 208 is the same as the procedure shown in FIG. In step 501, the empty state of the buffer 106 is checked. When the amount of information recorded in the buffer 106 for which the decoding process is completed is less than the predetermined amount, the process proceeds to step 209. If a certain amount of information that the decoding process is completed is recorded in the buffer 106, the process proceeds to step 502. In step 502, a command is issued to the reproduction speed control unit 107 so that the linear velocity (Rc) at the read position is halved, that is, the rotational velocity is halved. In step 502 in the figure, the rotation speed is set to ½ for simplification, but it is not necessarily required to be ½ and can be set appropriately. Step 20
The process after 9 is the same as the processing operation described with reference to FIG.

Next, with reference to FIGS. 6 and 7, a third embodiment for controlling the number of revolutions of the information recording disk according to the number of errors generated during the decoding process will be described. FIG. 6 is a flowchart showing a part of the third embodiment of the reproduction processing operation in the information recording disk reproducing apparatus according to the present invention. FIG. 7 is a flowchart showing another part of the third embodiment of the reproduction processing operation in the information recording disk reproducing device according to the present invention. In FIG. 6, the procedure from step 201 to step 208 is the same as the procedure described with reference to FIG.

In step 601, the error counter generated during the decoding process is reset. This error counter is stored in the RAM 110. In step 209, the reproduction speed control unit 107 is instructed of the rotation speed corresponding to the linear speed at the read position. In step 210, the information recording disc 103 is read by the information recording disc reading device 108.
To read information from. In step 211,
The decoder 109 is instructed to start the decoding process. The decoder 109 performs a decoding process into a format in which the information read from the information recording disk 103 by the information recording disk reading device 108 can be transferred to the host computer 101.

Next, referring to FIG. 7, an explanation will be given. Note that (a) to (e) of FIG. 6 are connected to (a) to (e) of FIG. In step 212 of FIG. 7, the completion of the decoding process of the decoder 109 is awaited, and when the decoding process is completed, the process proceeds to step 602. In step 602, it is confirmed whether or not an error has occurred during the decoding process. If no error has occurred, the process proceeds to step 213, and if an error has occurred, the process proceeds to step 603 to add the error count. In step 604, the number of error occurrences counted in step 603 is determined. If the number of error occurrences is less than the threshold value, the process proceeds to step 210 without changing the rotation speed of the information recording disk, and the information reading is instructed again. If the number of error occurrences is greater than or equal to the threshold, the process proceeds to step 605. In step 605, the rotational speed at which the linear velocity at the read position is reduced is designated. In the example, step 605.
Although the linear velocity at 1 is set to 1/2, this value is merely an example, and since this value can take various values, there is no need to be bound to this value. In step 605, the linear velocity of the information recording disc is reduced and the number of rotations is changed according to the linear velocity.
It is also possible to make a retry of reading again from 03. Since step 213 and subsequent steps are the same as those in the embodiment described with reference to FIG.

As described above, according to the present invention, the number of rotations of the information recording disk is controlled according to the setting of the transfer type from the host computer or the amount of decoded information accumulated in the buffer. Thus, low power consumption and low noise of the drive device can be realized. Furthermore,
The reliability at the time of reading can be improved by changing the number of rotations of the information recording disk according to the number of errors included in the decoded information or by reading again.

For example, in a drive device for long-time reproduction such as DVD video software which requires high-speed reading of an information recording disk, low power consumption and low noise can be realized and the information recording drive Can be read finely and the reliability at the time of reading can be improved.

[0035]

As described above, according to the present invention, low power consumption and low noise can be realized. Also,
It is possible to increase the reliability of reading by finely reading from the information recording drive.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of an information recording disk reproducing apparatus according to the present invention.

FIG. 2 is a flowchart showing a first embodiment of a reproduction processing operation in the information recording disk reproducing apparatus according to the present invention.

FIG. 3 is a table showing a maximum linear velocity ratio for each transfer type.

FIG. 4 is a table showing a rough maximum linear velocity ratio for each transfer type.

FIG. 5 is a flowchart showing a second embodiment of the reproduction processing operation in the information recording disk reproducing apparatus according to the present invention.

FIG. 6 is a flowchart showing a part of a third embodiment of the reproduction processing operation in the information recording disk reproducing device according to the present invention.

FIG. 7 is a flowchart showing another portion of the third embodiment of the reproduction processing operation in the information recording disk reproducing device according to the present invention.

[Explanation of symbols]

101 ... Host computer, 104 ... Microprocessor, 105 ... ROM, 106 ... Buffer, 107 ... Reproduction speed control unit, 108 ... Information recording disk reading device, 109 ... Decoder, 110 ... RAM.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G11B 20/18 572 G11B 20/18 572C 572F

Claims (8)

[Claims] 1. An information recording disk reading means for reading information from an information recording disk, a reproduction speed control means for controlling a reproduction speed when reading information recorded on the information recording disk, and a buffer for reading. A decoding device for decoding the information and an information transfer means for transferring the decoded information to the outside are provided, and the reproduction speed control means controls the reproduction speed control means to set the transfer rate according to the transfer type of the information transfer means. An information recording disk reproducing apparatus characterized by controlling a reproducing speed from an information recording disk. 2. The information recording disk reproducing apparatus according to claim 1, wherein the maximum linear velocity at the time of reading the information stored in the information recording disk is calculated based on the transfer rate of the transfer type, and the information recording is performed. An information recording disk reproducing apparatus, wherein a linear velocity at a reading position of the disc reading means is calculated, and the linear velocity at the reading position is controlled by the reproducing speed control means to be equal to or lower than the maximum linear velocity. 3. The information recording disk reproducing apparatus according to claim 1, wherein the reproducing speed of said reproducing speed control means is controlled according to the amount of information stored in a buffer provided in said decoding apparatus. An information recording disk reproducing device. 4. The information recording disk reproducing apparatus according to claim 1, wherein the presence or absence of an error at the time of decoding by the decoding device is determined, and the reproducing speed of the reproducing speed control means is determined based on the number of errors. An information recording disk reproducing apparatus characterized by performing either control or causing the information recording disk reading means to read information from the information recording disk again. 5. The information recording disk recording apparatus according to claim 1, wherein the maximum linear velocity at the time of reading the information stored in the information recording disk is calculated based on the transfer rate of the transfer type, and the information recording is performed. The linear velocity at the reading position of the disc reading unit is calculated, and the linear velocity at the reading position is controlled by the reproducing velocity control unit so as to be substantially the maximum linear velocity. When the amount of information stored in the buffer is equal to or larger than a predetermined value, the reproduction speed of the reproduction speed control means is reduced. 6. The information recording disk recording apparatus according to claim 1, wherein the maximum linear velocity at the time of reading the information stored in the information recording disk is calculated based on the transfer rate of the transfer type, and the information recording is performed. The linear velocity at the reading position of the disc reading means is calculated, the linear velocity at the reading position is controlled by the reproducing speed control means so as to be substantially the maximum linear velocity, and the decoding by the decoding device is performed. When the number of errors is equal to or more than a predetermined value, control is performed to reduce the reproduction speed of the reproduction speed control means, or the information recording disc reading means performs the information recording. An information recording disk reproducing apparatus characterized in that information is read from the disk again. 7. The information recording disk reproducing apparatus according to claim 1, wherein when the amount of information stored in the buffer provided in the decoding apparatus is equal to or more than a predetermined value, the reproducing speed of the reproducing speed control means is set. If the number of errors is greater than or equal to a predetermined value, the reproduction speed of the reproduction speed control means is controlled, or the information recording is performed. An information recording disk reproducing apparatus, characterized in that the disk reading means is caused to read information from the information recording disk again. 8. The information recording disk recording apparatus according to claim 1, wherein the maximum linear velocity at the time of reading information stored in the information recording disk is calculated based on the transfer rate of the transfer type, and the information recording is performed. The linear velocity at the reading position of the disc reading unit is calculated, and the linear velocity at the reading position is controlled by the reproducing velocity control unit so as to be substantially the maximum linear velocity. When the amount of information stored in the buffer is equal to or more than a predetermined value, the reproduction speed of the reproduction speed control means is reduced,
Whether or not there is an error at the time of decoding by the decoding device is determined, and when the number of errors is equal to or more than a predetermined value, the reproduction speed of the reproduction speed control means is controlled, or the information recording disk reading means. An information recording disk reproducing apparatus, wherein the information recording disk reproducing apparatus is configured to read information from the information recording disk again.