Rotational speed control method for a disk player
View Patent ↗A method is disclosed for adjusting the rotational speed of a disk player based on a calculated variable. The method increases the rotational speed of the disk player when the calculated variable is greater than a first threshold and decreases the rotational speed of the disk player when the calculated variable is less than a second threshold.
1. A method for controlling the rotational speed of a disk player, comprising:
(a) calculating a weighted summation (Ck) of read-commands which the disk player receives during a unit time T;
(b) increasing the rotational speed of the disk player if the weighted summation is greater than a first threshold during each of m consecutive units of time T; and
(c) decreasing the rotational speed of the disk player if the weighted summation is less than a second threshold during each of n consecutive units of time T.
2. The method of claim 1 , wherein the first threshold is greater than the second threshold.
3. The method of claim 1 , wherein the weighted summation is the number of read-commands during a unit time T.
4. The method of claim 1 , further including shifting the values of a predetermined number of previous consecutive Ck values.
5. The method of claim 1 , further including setting Ck to a value that is between the values of the first threshold and the second threshold after performing either step (b) or step (c).
6. A method for controlling the rotational speed of a disk player, comprising:
(a) determining a period of time (Tk) the disk player spends processing a predetermined amount (D) of data;
(b) decreasing the rotational speed of the disk player if the time Tk is greater than a first threshold during each of m consecutive units of data D; and
(c) increasing the rotational speed of the disk player if the time Tk is less than a second threshold during each of n consecutive units of data D.
7. The method of claim 6 , wherein the first threshold is greater than the second threshold.
8. The method of claim 6 , further including shifting the values of a predetermined number of previous consecutive Tk values.
9. The method of claim 6 , further including setting Tk to a value that is between the values of the first threshold and the second threshold after performing either step (b) or step (c).
10. A method for controlling the rotational speed of a disk player, comprising:
(a) determining a period of time (Tk) the disk player spends processing a predetermined number of read-commands;
(b) decreasing the rotational speed of the disk player if the time Tk is greater than a first threshold during each of m consecutive units of read-commands Nc; and
(c) increasing the rotational speed of the disk player if the time Tk is less than a second threshold during each of n consecutive units of read-commands Nc.
11. The method of claim 10 , wherein the first threshold is greater than the second threshold.
12. The method of claim 10 , further including shifting the values of a predetermined number of previous consecutive Tk values.
13. The method of claim 10 , further including setting Tk to a value that is between the values of the first threshold and the second threshold after performing either step (b) or step (c).