Dynamic write strategy modification method and apparatus

• US 7,577,068 B2
• Filed: 04/18/2006
• Issued: 08/18/2009
• Est. Priority Date: 04/18/2006
• Status: Expired due to Fees

• Current Assignee: MediaTek, Inc.
• Original Assignee: MediaTek, Inc.
• Inventors: Chan, Yu-Min
• Primary Examiner(s): Edun; Muhammad N.
• Application Number:
  US11/379,070
• Publication Number:
  US 20070242584A1
• Time in Patent Office: 1,218 Days
• Field of Search: None
• US Class Current: 369/47.53
• CPC Class Codes: G11B 7/0062 Overwriting strategies, e.g. recording pulse sequences with erasing level used for phase-change media
• CPC Class Codes: G11B 7/1267 Power calibration

Abstract

The invention relates to write strategy modification, and in particular, to dynamic write strategy modification. A dynamic write strategy modification method comprises: writing a plurality of data on to an optical disk according to a writing strategy with at least three parameters; measuring at least two quality indices of the data wrote on the optical disk; storing a result comprising the parameters and the corresponding quality indices; judging whether a terminate condition is achieved; if no, changing the parameters and repeating the above steps; if yes, analyzing the stored results and outputting an optimal writing strategy with at least three optimal parameters.

Claims

1. A dynamic write strategy modification method comprising:

writing a plurality of data on to an optical disk according to a writing strategy with at least three parameters;

measuring at least two quality indices of the data wrote on the optical disk;

storing a result comprising the parameters and the corresponding quality indices;

judging whether a terminate condition is achieved;

if no, changing the parameters and repeating the above steps; and

if yes, analyzing the stored results and outputting an optimal writing strategy with at least three optimal parameters.

2. The dynamic write strategy modification method of claim 1, wherein the parameter is selected from the group comprised a back-end pulse interval, a front-end pulse ratio, and a back-end pulse ratio.

3. The dynamic write strategy modification method of claim 2, wherein quality indices are selected form the group comprised a jitter value and a mark length corresponding to a specific wrote data.

4. The dynamic write strategy modification method of claim 3, wherein the back-end pulse interval is reduced to minimize the jitter value when a transfer rate increases.

5. The dynamic write strategy modification method of claim 3, wherein the front-end pulse ratio is reduced to minimize the jitter value when a transfer rate increases.

6. The dynamic write strategy modification method of claim 3, wherein the back-end pulse ratio is increased to minimize the jitter value when a transfer rate increases.

7. The dynamic write strategy modification method of claim 1, wherein the step of analyzing the stored results further comprises choosing a back-end pulse interval corresponding to an accurate mark length as one of the optimal parameters.

8. The dynamic write strategy modification method of claim 1, wherein the step of analyzing the stored results further comprises choosing a front-end pulse ratio corresponding to a minimum jitter value as one of the optimal parameters.

9. The dynamic write strategy modification method of claim 1, wherein the step of analyzing the stored results further comprises choosing a back-end pulse ratio corresponding to a minimum jitter value as one of the optimal parameters.

10. The dynamic write strategy modification method of claim 1, wherein the terminate condition is selected from the group comprised:

(a) the quality indices are qualified;

(b) the quality indices are divergent; and

(c) the write strategy is a last write strategy for writing the data.

11. A dynamic write strategy modification apparatus comprising:

a pick-up head (PUH) for writing a plurality of data on to an optical disk according to a writing strategy with at least three parameters;

an RF signal processing circuit for measuring at least two quality indices of the data wrote on the optical disk;

an adjusting control circuit for

storing a result comprising the parameters and the corresponding quality indices;

judging whether a terminate condition is achieved;

if no, changing the parameters to generating a next write strategy and transmitting the next write strategy to the PUH; and

if yes, sending the results; and

a result processing unit for

receiving the results from the adjusting control circuit;

analyzing the stored results; and

outputting an optimal writing strategy with at least three optimal parameters according to the analyzing.

12. The dynamic write strategy modification apparatus of claim 11 further comprising:

a recording signal generator for receiving the data will be recorded on the disc and preparing recording signal according to the data and the write strategy.

13. The dynamic write strategy modification apparatus of claim 11, wherein the parameter is selected from the group comprised a back-end pulse interval, a front-end pulse ratio, and a back-end pulse ratio.

14. The dynamic write strategy modification apparatus of claim 11, wherein quality indices are selected form the group comprised a jitter value and a mark length corresponding to a specific wrote data.

15. The dynamic write strategy modification method of claim 14, wherein the back-end pulse interval is reduced to minimize the jitter value when a transfer rate increases.

16. The dynamic write strategy modification method of claim 14, wherein the front-end pulse ratio is reduced to minimize the jitter value when a transfer rate increases.

17. The dynamic write strategy modification method of claim 14, wherein the back-end pulse ratio is increased to minimize the jitter value when a transfer rate increases.

18. The dynamic write strategy modification apparatus of claim 11, wherein a back-end pulse interval corresponding to an accurate mark length is one of the optimal parameters.

19. The dynamic write strategy modification apparatus of claim 11, wherein a front-end pulse ratio corresponding to a minimum jitter value is one of the optimal parameters.

20. The dynamic write strategy modification apparatus of claim 11, wherein the step of analyzing the stored results further comprises choosing a back-end pulse ratio corresponding to a minimum jitter value as one of the optimal parameters.

21. The dynamic write strategy modification apparatus of claim 11, wherein the terminate condition is selected from the group comprised:

(a) the quality indices are qualified;

(b) the quality indices are divergent; and

(c) the write strategy is a last write strategy for writing the data.