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Tuesday, February 06, 2007

3. CD Error Correction

In the following tests, we check the drive's behavior when reading scratched / defective audio discs. The test discs used were the ABEX series from ALMEDIO.


Errors total Num: 746128
Errors (Loudness) dB(A) Num:39347 Avg: -73.4 dB(A) Max: -23.9 dB(A)
Error Muting Samples Num:2439 Avg: 1.0 Samples Max: 9 Samples
Skips Samples Num: 0 Avg: 1.0 Samples Max: 0 Samples
Total Test Result 77.3 points (of 100.0 maximum)

This is a very satisfactory result for the specific test. The overall error count is relatively low, and most importantly there were no skipped samples.

- ABEX TCD-726

Errors total Num: 0
Errors (Loudness) dB(A) Num:36 Avg: -34.4 dB(A) Max :-25.9 dB(A)
Error Muting Samples Num: 0 Avg: 0 Samples Max: 0 Samples
Skips Samples Num: 4 Avg: 297.0 Samples Max: 342 Samples
Total Test Result 78.7 points (out of 100.0 maximum)

This was not as good as we would have expected. There are skipped samples and the Test Result Score of 78.7 is quite low.

- CD-Check Audio Test Disc

The CD-Check Test Disc is a very useful tool for evaluating the Sound Reproduction / Error correction capabilities of a CD player. The disc offers a signal combination with disc error patterns to rate the drive's abilities to read music and reproduce it completely. Five tracks on the disc contain a sequence of progressively more difficult tests. These tracks are referred to as Check Level-1 through Check Level-5.

The tracks are reproduced through a software multimedia player (e.g. Windows Media Player). Each level is considered as passed, if the tone is smooth, continuous without interruptions, skipping or looping. The higher the Check Level passed, the more reliable the sound reproduction of the tested drive.

Error Level
LiteOn LH-20A1P

The drive achieved flawless reading with the first 3 tracks. Playing the fourth and fifth track produced audible interruptions in the sound as well as clicks.

- Summary

Overall, the drive appears to have average CD Error correction capabilities.

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