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Home > Hardware Reviews > Optical Storage > DVD Recorders Double Layer

Friday, September 02, 2005
NEC ND-3540A

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.

- ABEX TCD-721R

Errors total
Num: 1469093
Errors (Loudness) dB(A)
Num: 118376 Avg: -78.7 dB(A) Max: -33.8 dB(A)
Error Muting Samples
Num: 4888 Avg: 1.0 Samples Max: 28 Samples
Skips Samples
Num: 2 Avg: 6.0 Samples Max: 6 Samples
Total Test Result
70.4 points (out of 100.0 maximum)
C2 Accuracy
99.7 %

The error totals can be described as a bit high for this test although the maximum error loudness is acceptable. Overall, average performance with this test media.

- ABEX TCD-726

Errors total
Num: 3545
Errors (Loudness) dB(A)
Num: 4254 Avg: -83.9 dB(A) Max: -15.2 dB(A)
Error Muting Samples
Num: 53 Avg: 22.1 Samples Max: 467 Samples
Skips Samples
Num: 0 Avg: 0.0 Samples Max: 0 Samples
Total Test Result
80.1 points (out of 100.0 maximum)
C2 Accuracy
99.8 %

The 726 test media, is usually no problem for the majority of the tested drives. However in this case, we got readings that indicate poor CD error correction capabilities.

- 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 (i.e. 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
1
2
3
4
5
NEC ND-3540A
5/5
5/5
5/5
5/5
0/5

With this test disc, the drive reported good results, managing to read flawlessly 4 tracks out of 5.

- Summary

The NEC ND-3540A is a bit of a mixed bag with CD error correction. The results with the ABEX TCD-721 and 726 disks were not the best we've seen but the CD Check disc was certainly better than average.




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