Methods and devices for recording one or more signals which have been encoded by on error detection and correction algorithm on a record carrier by means of an optimal recording intensity
AssigneeU.S. Philips Corporation
InventorsJohannes L. Bakx, Johannes H. M. Spruit, Hindrik Veldhuis
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Abstract
A method and device for recording signals on a record carrier with the aid of a radiation beam (15). The signals are recorded in the form of optically detectable marks in parallel tracks which have a substantially constant track pitch. The recording intensity of the radiation beam is set in such a way that with a "minimum" recording intensity information patterns are recorded with a low desired error rate "(Block) Error Rate". Furthermore, a method and device are described by which the "minimum" recording intensity of the radiation beam can be determined.
Claims34
A method for recording one or more signals encoded by means of an error detection and correction algorithm in a track on a record carrier of a type that can be overwritten, the method comprising the following steps:
- (a) recording a test information pattern on the record carrier by means of a radiation beam being set at a selected recording intensity to produce a recorded information pattern on the record carrier, the test information pattern having been encoded by means of the error detection and correction algorithm;
- (b) reading the recorded information pattern from the record carrier to produce a reproduced information pattern;
- (c) determining an error rate for the reproduced information pattern on the basis of the error detection and correction algorithm;
- (d) selecting an optimal recording intensity for use in recording the one or more signals on the basis of the error rate;
- and
- (e) recording the one or more signals on the record carrier by means of the radiation beam being set at the optimal recording intensity.
A recording device for recording one or more signals in substantially parallel tracks on a record carrier of a type that can be overwritten, the device comprising:
- recording means for recording a test information pattern and the one or more signals on the record carrier by means of a radiation beam having a recording intensity;
- setting means for setting the recording intensity of the radiation beam at (a) a selected recording intensity, on the basis of a test information pattern, for recording the test setting signal, and (b) at an optimal recording intensity, on the basis of an optimal setting signal, for recording the one or more signals;
- reading means for reading the test information pattern, after the test information pattern has been recorded on the record carrier, to produce a reproduced information pattern;
- and
- processing means for (a) producing the test information pattern and the one or more signals by means of an error detection and correction algorithm, (b) determining an error rate for the reproduced information pattern on the basis of the error detection and correction algorithm and (c) producing the test setting signal and the optimal setting signal, the optimal setting signal being produced on the basis of the error rate.
Dependencies are inferred from the claim text.