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Wednesday, March 26, 2008

3. CD error correction tests

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 : 397810731
Errors (Loudness)
Num 1882477
Avg : -23.7dB(A)
Max : -3.2dB(A)
Error Muting
Num :759291
Avg : 1,1 Samples
Max : 470 Samples
Num 15
Avg :2760.1 Samples
Max 2939 Samples
Total Test Result
47.5 points (of 100.0 maximum)
C2accuracy : 50.1%

Not a good score presenting a high level of noise.

- ABEX TCD-726

Errors total
Num 397812496
Errors (Loudness)
Num 1882487
Avg : -23.7dB(A)
Max : -3.2dB(A)
Error Muting
Num :760631
Avg : 1.1 Samples
Max :470 Samples
Num :15
Avg :2760.1 Samples
Max :2939Samples
Total Test Result
47.5 points (of 100.0 maximum)
C2accuracy :50.0%

Same results here, too, with a big amount of noise being generated. Keep in mind, though, that this noise is not always audible.

- CD-Check Audio Test Disc

The CD-Check Test Disc is another 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

The drive managed to correctly play the first three tracks. Problems occurred with the fourth and fifth tracks. An average performance for DH20A4P

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