JP2002367273A - Method of determining rotating speed of optical disk device by system detection - Google Patents

Abstract

PROBLEM TO BE SOLVED: To determine the rotating speed of an optical disk device by detecting the time of respective reading values of a system and performing computation. SOLUTION: The method of determining the rotating speed of the optical disk device by the following system detection is provided: The required reading speed of the immediate work is acquired by computing the number of the reading blocks of the previous time, the time value finished of the reading described above and the time value to begin the reading this time from a reading command and in addition, this reading speed is compared with the reading speed of the optical disk device of this time; the number of times is recorded; the rotating speed of the optical disk device is changed when the number of times of this time attains the threshold value; and this threshold value is the value of the number of times to permit the change of the rotating speed of the optical disk device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for determining the rotation speed of an optical disk device by detecting a system, and more particularly, to determining the rotation speed of the optical disk device by detecting the time of each read value of the system and performing an operation. The present invention relates to a method for determining a rotation speed of an optical disk device by system detection.

[0002]

2. Description of the Related Art As the speed multiple of an optical disk writer has been improved, there has been an increasing demand for users to improve the information reading speed of an optical disk device. However, the higher the rotation speed of the spindle motor of the optical disk device, the more severe the vibration and the generation of heat energy, which affect the stability of the optical laser read head for reading information, and greatly affect the performance of the optical disk device. Often, they reduce noise and power consumption.

[0003] Usually, a high rotation speed is used only when a large amount of information is read, and when a music optical disk is broadcast or a VCD is broadcast, its functionality cannot be fully exhibited. The rotation speed simply maintains 1 or 2 times the speed, so that when a computer system reads information, it is simply used for broadcasting and does not require a higher rotation speed, and therefore, when reading an optical disc device. If the actual required rotation speed can be detected, the rotation speed of the optical disk device can be changed.

As a conventional method for reducing the rotation speed of an optical disk, generally, software is combined with a mechanism to detect the state of vibration and the state of deviation from the trajectory, but it is necessary to increase the number of extra detection electric circuits for processing. As shown in FIG. 1, the method of reducing the rotation speed of the optical disk device using only other kinds of software detects the state of the ejection key of the optical disk device every 10 ms by the control chip inside the optical disk device, and when the ejection key is not pressed. The signal is high (hig
h), and when pressed, the signal goes low. In use, the optical disk device is first set to a low transmission speed multiple (step 10), and at this time, the timer is reset (step 11) and the ejection key is set. Is detected to be pressed (step 12).

When the ejection key is not pressed (step 1)
Return to 2) and continue detection. If the go-out key is kept pressed, the eject key outputs a low signal to the control chip, starts the timer and starts calculating the time, and checks whether the elapsed time of the timer exceeds 5 seconds. Detect (step 13). If not,
Assuming that the general ejection key is pressed, the ejection operation is executed (step 14) and the process returns to step 11. If affirmative, the control chip enables the light emitting diode (LED) in the optical disk device, blinks the light emitting diode to indicate that the switching is successful, and switches the optical disk device to a high transmission rate multiple (step 15), The rotation speed can be switched to the maximum rotation speed that can be provided by the optical disk device. When the user presses the ejection key in a conventional manner, the optical disc device performs the ejection operation of the optical disc and returns to the original low transmission speed multiple.

[0006] However, the above steps require manual operation, and can be said to be quite inconvenient. Therefore, as can be seen from the above description, the conventional method for reducing the rotational speed of the optical disk device has obvious inconvenience and disadvantages in actual use and needs to be improved.

[0007]

SUMMARY OF THE INVENTION As described above, in order to solve the conventional problems, the present invention is to dynamically rotate an optical disk device based on the speed of a command issued from an operation system or an application program to the optical disk device. It is a main object of the present invention to provide a method for determining a rotation speed of an optical disk device that determines a speed and avoids the problems of noise and high power consumption due to a high rotation speed.

[0008]

In order to achieve the above object, the present invention calculates the number of blocks to be read last time, the time at which the reading has been completed, and the time value at which the current reading is to be started from a read command. In addition to obtaining the required reading speed, comparing it with the reading speed of the optical disk device at hand, recording the number of times, and changing the rotation speed of the optical disk device when the current number of times becomes a critical value, the critical value is Provided is a method for determining the rotation speed of an optical disk device by system detection, which is a count value that allows the optical disk device to change the rotation speed.

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. However, those methods are preferred embodiments of the present invention, and the present invention is limited to those contents. Not something.

[0010]

FIG. 2 is a flowchart of the operation of the present invention. The present invention relates to a method for determining a rotation speed of an optical disk device by system detection. The optical disk device reads 75 blocks per second at 1 × speed, and reads 150 blocks per second at 2 × speed. As can be understood from this analogy, the working system of the computer is When the interval between the time when the read command is issued to the optical disk device and the next time the read command is issued to the optical disk device after reading N blocks is T seconds, the information reading speed multiple X required for work is calculated by the following formula. I can do it. The formula is X = N /
(75 × T).

Therefore, the rotation speed of the optical disk device is set to X
If it is set to be slightly larger, it will satisfy the needs of the computer work system. Therefore, the following steps can be obtained: Step 20: The number of times A, which is higher than the reading speed of the optical disk device at hand, is set to 0 in advance, and the number of times B, which is lower than the reading speed of the optical disk device at hand, is set to 0. Set to.

Step 21: A command is received from the work system or the application program, and the number Nn of blocks to be read and the time value Tsn to start reading are obtained.

Step 22: Number of previously read blocks N
The reading speed X required for the task at hand is obtained by calculating n-1, the time value Ten-1 at which the reading has been completed last time, and the time value Tsn at which the current reading is started, and X = Nn-1 / [7
5x (Tsn-Ten-1)].

Step 23: Is this reading speed X higher than the reading speed of the optical disk device at hand? Otherwise, skip to step 29; if so, enter step 24.

Step 24: A = A + 1 Step 25: Is A greater than a critical value (this critical value is the number of times that the optical disk device is allowed to change the rotation speed)? Otherwise, skip to step 27; if so, enter step 26.

Step 26: The reading speed of the optical disk device is improved, and A is reset to 0.

Step 27: Information is read from the optical disk device.

Step 28: The information and the respective states are fed back to the work system or the application program, and the time value of the current end is recorded to be Ten, and the process returns to step 21.

Step 29: Is the reading speed X smaller than the reading speed of the optical disk apparatus at hand? In the opposite case, the process skips to step 27, which means that the read speed X required for the operation is the same as the read speed of the optical disk device immediately before. If so, skip to step 30.

Step 30: B = B + 1 Step 31: Is B greater than a critical value? Otherwise, skip to step 27; if so, enter step 32.

Step 32: The reading speed of the optical disk device is reduced, B is reset to 0, and the process skips to step 27.

According to these processes, the optical disk apparatus does not change the rotation speed according to the difference in the calculation result, and the number of times that the reading speed of the optical disk continuously becomes larger or smaller than the reading speed of the immediately preceding optical disk becomes larger than the critical value. Only make changes and gain stability. The preferred set value of the critical value is 10-20 times.

[0023]

As described above, according to the method for determining the rotational speed of an optical disk based on the system detection of the present invention, there is no need to add an extra electric circuit, and the automatic operation of the optical disk device is not required without the assistance of external means. The purpose of the present invention is to determine the rotation speed in a short time, thereby avoiding high noise and high power consumption, and obtaining good working efficiency.

[Brief description of the drawings]

FIG. 1 is a flowchart of an operation of a conventional method for reducing the rotation speed of an optical disk device.

FIG. 2 is a flowchart of the operation of the present invention.

Claims (3)

[Claims] 1. The number of blocks to be read by receiving a command from a work system or an application program (Nn) and a time value to start reading (Tsn)
(A) to obtain the number of blocks Nn-1 read last time, the time value Ten-1 last read last time, and the time value (T
(b) acquiring the reading speed (X) required for the task at hand by performing the calculation according to (sn), and determining whether or not the reading speed (X) is larger / smaller than the reading speed of the optical disc apparatus at hand. Step (c) of recording the number of times when the condition is satisfied, and Steps (a) to (c) are repeated if the number of times becomes smaller than a predetermined critical value, but the number of times becomes a predetermined critical value. And (d) for increasing / decreasing the rotational speed of the optical disk device. 2. The formula of the step (b) is X = Nn.
2. The method according to claim 1, wherein the rotation speed is determined to be -1 / [75x (Tsn-Ten-1)]. 3. The method according to claim 1, wherein the critical value in the step (d) is a number of times that the optical disk device is allowed to change the rotational speed.