KR100952947B1 - Method for controlling speed in optical disc device - Google Patents

Abstract

PURPOSE: A method of controlling the reproduction speed in an optical disc unit is provided to enhance the convenience of user by reducing the noise and heat production and power consumption. CONSTITUTION: A method of controlling the reproduction speed in an optical disc unit comprises the steps of: detecting the actual transmission rate of data which is read from an optical disc and transmitted to a host(S304), determining the operating mode of the host as either a data copy mode or a content reproduction mode for the optical disc based on the detected actual transmission rate(S305), and controlling the rotation speed of the optical disc by comparing the reference rotation speed corresponding to the determined mode with the current rotation speed of the optical disc(S306,S309), wherein for the state in which the actual transmission rate of the data is divided into a plurality of sections and the reference rotation speed is set for each section, if the host mode is determined to be the content reproduction mode, the reference rotation speed in a section to which the actual transmission rate of the detected data belongs among the sections is compared with the rotation speed of the optical disc.

Description

Method for controlling speed in optical disc device

The present invention relates to a method for adjusting the rotational speed of a disk of a disk in an optical disk device.

As the capacity of optical discs increases with the development of CDs, DVDs, and BDs, high transfer speeds are required to transfer large amounts of data in a short time, and optical disc devices have also become higher in speed.

The optical disk device controls recording or playback of the optical disk while rotating the disk at a function-oriented, i.e., the highest speed that can be implemented in the device, regardless of the user's needs. Regeneration by such a high speed rotation has a problem that causes more noise, heat generation, power consumption than necessary.

Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is to provide a method for adjusting a playback speed on a user basis in an optical disk device.

According to an aspect of the present invention, there is provided a speed adjusting method of an optical disk apparatus, the method including: detecting an actual data rate of data read from an optical disk and transmitted to a host; Determining a mode of a host based on the detected actual transmission rate; And adjusting the rotation speed of the optical disc by comparing the reference rotation speed corresponding to the determined mode with the current rotation speed of the optical disc.

In the optical disk apparatus according to another embodiment of the present invention, the speed adjusting device comprises: a pickup for reading data from the optical disk; A spindle motor for rotating the optical disk; A servo unit for driving the optical pickup and the spindle motor; A memory for temporarily storing data read through the pickup; A communication unit which communicates with an external host to receive a data transfer command from the host and transmits data stored in the memory to the host; And detecting an actual transmission rate of data transmitted to the host through the communication unit, determining a mode of the host based on the detected actual transmission rate, and determining a reference rotation speed corresponding to the determined mode and a current rotation speed of the optical disk. Comprising a control unit for adjusting the rotational speed of the optical disk for controlling the servo unit to adjust the rotational speed of the optical disk by comparison.

Therefore, it is possible to increase the ease of use of the user by reducing the generation of more noise and heat and waste of power consumption than necessary. In addition, the optimized speed adjustment can reduce vibration of the device and improve performance.

Hereinafter, an embodiment of a speed adjusting method in an optical disk apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

BD drives are not yet active in the market, but CD / DVD burners support high speeds of 48x CD and 22x DVD, enabling fast data transfer or recording. However, in the case of simple playback of a CD, DVD or BD title, the disc device does not necessarily have to rotate the disc at high speed.

In order to control the rotation of the disc at the optimum speed, the disc apparatus must be able to determine what mode the host is in, that is, the extraction / copy mode in which fast transfer is required or the simple playback mode of the title.

When the disk device transmits a data transfer request command (read command) from the host, or more precisely, an application or an operating system (OS) running on the host, as shown in FIG. While reading the data temporarily stored in the buffer, the data stored in the buffer is actually transmitted to the host through a transfer command (transfer command).

The disk apparatus transmits data of a predetermined size in response to a plurality of transfer commands with one transfer request command including a data amount as a parameter. When all of the requested data are transmitted, the next transfer request command is issued from the application and transmitted. do.

In general, when the host's situation is in the transmission mode, a high period transfer request command may be issued, and in the simple playback mode, a constant interval and low period transfer request command may be issued.

However, depending on the load of the CPU that processes the data in the host, even if the transfer request command is not issued or is regularly issued in the application, the transfer request command is not transmitted to the disk device at regular intervals so that the playback control of the disk device is not uniform. You may not.

For example, when the situation of an application running on a host is extracting or copying data on a disk, a transfer request command is generally issued at a high interval and is transmitted to the disk device. When the load of the host system is high, the transfer request command is irregular. The disk device may be issued to determine that a low data rate is requested, such as playing content in the disk, thereby lowering the rotation speed of the disk.

On the other hand, when the situation of the application is playing the contents in the disk, a transfer request command is generally issued at a low cycle and is transmitted to the disk device. Is transmitted a lot, the disk device may determine that the request for a high transfer rate, such as extracting data in the disk to increase the rotational speed of the disk.

In addition, an application, such as a Winamp program, that plays a disc inserted in a disk device may issue the next transfer request command as soon as all of the requested data is transferred, but otherwise, irregularly issue the transfer request command, that is, After issuing the transfer request command and receiving the requested data several times, the transfer request command may not be issued for a long time and then the transfer request command is issued and the reception of the requested data may be repeated.

Applications such as Winamp operate their own buffers through the host's memory and receive and store the data at a higher rate than the required data rate. This is based on the host's OS load, ie other applications running on the OS This is to prepare for the case that the data transfer request command issued by the disk reproducing application is delayed and transmitted to the disk device due to a large load on the CPU.

When the disk device judges only on the basis of the transfer request command issued by the application, it is possible to misjudge the situation of the host at the moment, and also to control the rotation of the disc by following the transfer request command transmitted from the host as it is. The rotational speed of the motor changes frequently, resulting in additional noise and vibration during disk acceleration or deceleration.

In view of such a problem, in the present invention, the situation of the host is largely divided on the basis of the actual transfer rate of data, that is, whether the contents of the disc are reproduced or the data is extracted (copyed) from the disc, and the amount of transfer for each unit time is further divided. By controlling the rotation of the disk based on the transmission rate of the actual data measured by using it can prevent the rotational speed often changes with the change of the transmission rate.

The disk device according to the present invention uses a timer interrupt to measure the actual transfer rate of data, which is the amount of data transmitted to the host through the transmission unit of the disk device for a unit time, and for various unit times, for example, 100 ms. Measure and store the average transfer rate in 500 ms, 1 s, 5 s, and 10 s times over a certain number of times, e.g. 100 times, based on which mode the current rate corresponds to on the host, e.g. playing an audio CD It is possible to determine whether it is a video CD playback, content playback in a data CD or data copying / extraction and control the spindle motor to rotate the disk at a speed that is optimal for the determined mode.

In addition, the disk apparatus according to the present invention is required in the mode of the host to determine the actual transmission rate or even if the status of the host is determined to play the contents in the disk, that is, even if data is requested to be transmitted at a low period and data is transmitted to the host at a low transmission rate. The disc can be rotated at a constant speed that exceeds the transfer rate by at least two times, in order to compensate for the poor playback performance if the disc rotates at too low a speed.

2 shows a configuration of a disk device to which the present invention is applied.

The disk apparatus 100 according to the present invention includes a pickup 10 for reading data from or writing data to a disk, a spindle motor 20 for rotating the disk, movement of the pickup 10 and a spindle motor 10. Servo unit 30 for driving and controlling the rotation of the memory; memory 40 temporarily storing data read from the disk through the pickup 10; and data from the host 200 in communication with the host 200. When a data transmission command is received from the host 20 through the communication unit 50 and the communication unit 50 which receives the transmission command and transmits the data stored in the memory 40 to the host 200. The pickup unit 10 and the spindle motor 20 are controlled through the servo unit 30 to read data from the disk and temporarily store the data in the memory 40, and the memory 40 through the communication unit 50. Data stored in It may be configured to include a control unit 60 for transmitting to the host 200.

The communication unit 50 measures an actual data amount transmitted to the host 200 to calculate an actual data rate in units of several time units, for example, 100 ms, 500 ms, 1 s, 5 s, and 10 s, and the control unit 30 ) Checks the actual transmission rate per unit time transmitted while being continuously updated from the communication unit 50 to determine the mode of the host 200 corresponding thereto, and determines the reference rotational speed of the disc corresponding to the determined mode and rotates the current rotation. The rotational speed of the spindle motor 20 can be controlled in comparison with the speed.

The controller 60 determines that the data transmission from the disk apparatus 100 to the host 200 is maintained at a constant transfer rate level although there is some variation, that is, the mode of the host 200 is, for example, If it is judged as one of audio CD playback, video CD playback, and content playback in the data CD, the rotation speed of the disc is increased by measuring the rotation speed of the current disc and comparing the reference rotation speed suitable for the determined playback mode. It can be adjusted downward. Alternatively, the controller 60 may maintain the current rotational speed when the measured rotational speed of the disk deviates from the reference rotational speed within an allowable range, and may adjust the rotational speed of the disk up or down only when it is not. .

On the other hand, if it is determined that the mode of the host 200 corresponds to the disk copy or data extraction, it is advantageous to send the data to the host at the maximum transfer rate, so that the controller 60 allows the maximum allowed by the disk device 100. The spindle motor 20 may be controlled through the servo unit 30 to rotate the disk at a speed.

The control unit 60 measures and stores a transmission amount for each predetermined time unit using an internal timer having a predetermined short time period, and a completion trigger of each transmission command is generated from the communication unit 50. Then, the size of the transmitted data is stored for each unit time, and the amount of transmission for each unit time is calculated using the stored data size and the accumulated time of the completion trigger.

The controller 60 determines the playback mode that is performed in the host by using the actual transmission amount for each unit time calculated as described above, and a transmission rate for each unit time of 1 second or more is used as a criterion for changing the rotation speed, and 1 second. The following data rates per unit time may be used as reference data for buffering or decoding operations of the memory 40.

The control unit 60 determines the situation of the host by using a reference rate and a unit time rate for basic playback modes such as audio CD playback, video CD playback, DVD video playback, and BD video playback. The rotation speed of 20 is controlled by adding or updating the upper and lower limits of the transfer rate for various contents recorded on the data disc, for example, the transfer rate of the Dvix file recorded on the DVD-R disc. It may be.

3 is a flowchart illustrating a method of controlling a rotation speed according to an embodiment of the present invention.

When the host 200 wants to reproduce the contents included in the disk inserted into the optical disk device 100 or copy the data recorded on the disk, the host 200 requests a data transmission command (for example, Read Command) is transmitted to the optical disk device 100, and the data transfer command includes information on a data start position and a requested data size.

When the control unit 60 receives the transmission command through the communication unit 50 (S301), the control unit 60 performs an operation for reading data recorded on the disk. 20, the disk is rotated at a predetermined rotational speed (S302), and the pickup 10 is controlled by the servo unit 30 to move the pickup 10 to the starting position identified from the data transfer command. Read data from the moved position and temporarily store the data in the memory 40, and transmit the data stored in the memory 40 to the host 200 through the communication unit 50 (S303). .

The control unit 60 calculates an actual data rate of data transmitted through the communication unit 50 while transmitting data to the host 200 (S304). It is calculated by the unit time of, for example, 100ms, 500ms, 1s, 5s, 10s unit time and continue to update.

The controller 60 determines, for example, a playback mode that is performed in the host 200 on the basis of an actual transmission rate for 1 second unit time, and determines a reference rotation speed corresponding to the determined playback mode. In operation S305, when the determined reproduction mode is not a reproduction of content recorded on a disc, but a copy of a disc or extraction of data recorded on a disc, the reference rotation speed may be set to the maximum speed allowed by the disc device 100. have.

On the other hand, when it is determined that the progress mode of the host 200 is a content playback mode such as, for example, audio CD playback, video CD playback, content playback of Dvix, mp3, etc. recorded on a data CD, the controller 60 Determining the disc rotation speed corresponding to the determined playback mode as the reference rotation speed, in this case, the reference rotation speed may be set to a speed that exceeds the requested transmission rate several times to improve performance.

Thereafter, the controller 60 measures the rotational speed of the current disk and compares it with the reference rotational speed (S306), and checks whether the current rotational speed A is different from the reference rotational speed B within a predetermined allowable range d. If the current rotational speed and the reference rotational speed are not significantly different (Yes in S307), the current rotational speed is maintained (S308), and the current rotational speed differs from the reference rotational speed by more than the allowable range. In the case (No in S307) by controlling the spindle motor 20 through the servo unit 30 to adjust the rotational speed of the disk up or down (S309).

The controller 60 repeats the operations of steps 303 to 309 until the data transmission is completed in response to all the data transmission commands transmitted from the host 200 (S310).

In the above, the embodiment of controlling the rotation of the disc has been described by dividing the situation of the host into only two types: reproduction of contents recorded on the disc and extraction (or copying) of data recorded on the disc. In another embodiment of the present invention, the disc device may adjust the rotation speed differently according to the actual transfer rate measured for each unit time even for reproduction of the recorded content of the disc.

If the situation of the host is the playback of the content recorded on the disc, the actual transfer rate may vary depending on the type of the content recorded on the disc. The type can be determined. In addition, in the case of content reproduction recorded on a data disc, for example, DVD + R, the transfer rate may vary depending on the encoding state of the content, that is, the encoding method, the resolution, the sampling rate, and the like.

For content playback recorded on a data disc, depending on the encoding quality such as representative encoding state, for example, High Quality (HQ), Standard Quality (SQ), Low Quality (LQ) or High Definition (HD) or SD (Standard) Since the data rate varies depending on the resolution, the disk device stores the data in association with the reference data rate and the corresponding disk rotation speed for each representative encoding state, and transmits data to the host at the request of the host. The type of content data to be transmitted may be determined based on the measured actual transmission rate, and the rotation speed of the disc may be controlled.

For example, when the disk unit has a transmission rate of about 150 KB / s for an audio CD and the disk rotation speed is set to 8X, the disk rotation speed is set to 600 KB / s for a HD content recorded on a recording CD. Can be set to 12X, the standard transfer rate can be set to 250KB / s, the disk rotation speed can be set to 10X, MP3 files can be set to 128KB / s and the disk rotation speed can be set to 8X.

In addition, when there is no reference data rate corresponding to the actual data rate measured while reading data from the disk and transmitting the data to the host, the disk device refers to the reference rotation speed set for the playback of the corresponding disc type, for example, CD, DVD or BD. For example, the rotational speed of the disk may be controlled, or the rotational speed of the disk may be controlled based on the reference rotational speed set therein by finding a reference transmission rate higher than the actual transmission rate.

Alternatively, the disk device divides the data into several sections for a data rate lower than a data rate that can be determined to be content playback, sets and stores a reference rotation speed for each section, and transmits data to the host, thereby transmitting the actual data rate for each unit time. It is also possible to control the rotational speed of the disc by measuring a, searching for a section to which the measured actual transmission rate belongs, and a reference rotational speed for the searched section.

The reference rotation speed set for the section may be all the same or different for each section, may be proportional to the average transmission rate of the section to some extent. Also in this case, the reference rotation speed of each section may be set to a rotation speed that is at least two times or more than the required transmission rate.

For example, for the type of inserted disc (CD, DVD or BD), when the maximum transfer rate that can be determined to be content playback is 1.0 MB / s and the reference rotation rate is 8X, the actual transfer rate is 1.0 MB / s. The reference rotational speed is set to 7X for intervals from 700KB / s to 900KB / s with 70% to 90%, and reference rotation for intervals with 500KB / s to 700KB / s with 50% to 70% of 1.0MB / s. The speed may be set to 6X, and the reference rotational speed may be set to 4X for a section of 500 KB / s or less, which is 50% of 1.0 MB / s.

The above-described preferred embodiments of the present invention are disclosed for purposes of illustration, and those skilled in the art can improve, change, and substitute various other embodiments within the technical spirit and scope of the present invention disclosed in the appended claims below. Or addition may be possible.

FIG. 1 illustrates an example in which data is read from a disk, temporarily stored in a buffer of a disk device, and then transmitted to a host through a transmitter.

2 illustrates a configuration of a disk apparatus to which a double speed adjusting method according to the present invention is applied,

3 is a flowchart illustrating an operation of a method of controlling a speed in a disk device according to an embodiment of the present invention.

Explanation of symbols for main parts of the drawings

10 pickup 20 spindle motor

30: servo unit 40: control unit

50: memory 60: communication unit

100: disk device 200: host

Claims (10)

Detecting an actual transfer rate of data read from the optical disc and transmitted to the host; Judging a mode of a host based on the detected actual transmission rate by either copying of data recorded on the optical disk or reproducing content recorded on the optical disk; And And adjusting the rotational speed of the optical disk by comparing the reference rotational speed corresponding to the determined mode with the current rotational speed of the optical disk. The adjusting may be performed when the actual transmission rate of the data is divided into a plurality of sections according to the value and the reference rotation speed is set for each section, and the mode of the host is determined to be the reproduction of the content recorded on the optical disk. And comparing the rotation speed of the optical disk with the reference rotation speed set in the section to which the actual data rate of the detected data belongs among the plurality of sections. When the determined mode is reproduction of content recorded on the optical disc, the reference rotational speed is determined at a rotational speed of at least two times higher than the rotational speed enabling the data rate required for the determined mode. To adjust the speed on an optical disk device. The method of claim 1, And the mode of the host is determined based on an actual data rate calculated from an actual data rate detected for each unit of time. delete The method of claim 1, And when the determined mode is a copy of data recorded on the optical disk, the reference rotation speed is determined as the maximum rotation speed allowed by the optical disk device. delete The method of claim 1, The adjusting may include maintaining a current rotational speed when a difference between the reference rotational speed and the current rotational speed is within an allowable range. The method of claim 1, The adjusting may include adjusting the rotational speed of the optical disk up or down when the reference rotational speed is larger or smaller than the current rotational speed. delete The method of claim 1, And a reference rotation speed set in each of the sections is set to a rotation speed of at least two times higher than the rotation speed enabling the average data rate of the section. Pickup for reading data from the optical disk; A spindle motor for rotating the optical disk; A servo unit driving the pickup and the spindle motor; A memory for temporarily storing data read through the pickup; A communication unit which communicates with an external host to receive a data transfer command from the host and transmits data stored in the memory to the host; And Detects the actual data rate of the data transmitted to the host through the communication unit, and based on the detected actual data rate, the mode of the host is either copying of data recorded on the optical disk or reproduction of content recorded on the optical disk. And a controller for controlling the servo unit to adjust the rotational speed of the optical disk by comparing the reference rotational speed corresponding to the determined mode with a current rotational speed of the optical disk. The controller may be further configured to divide the actual data rate into a plurality of sections according to the value of the data and to determine the mode of the host to play back the content recorded on the optical disk in a state where the reference rotation speed is set for each section. Comparing the rotation speed of the optical disk with a reference rotation speed set in a section to which the actual data rate of the detected data belongs among a plurality of sections, and adjusting the rotation speed of the optical disk based on the comparison; The control unit, if it is determined that the mode is the reproduction of the content recorded on the optical disc, sets the reference rotational speed to a rotational speed that is at least two times higher than the rotational speed that enables the data rate required for the determined mode. A speed regulating device, characterized in that the optical disk device.

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