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Home > Hardware Reviews > Optical Storage

Wednesday, July 30, 2008
LiteOn DH-4B1S

3. CD error correction

This series of tests checks the drive's ability to correct/conceal possible erroneous data after reading artificially scratched / defective audio discs. The test discs used were the ABEX series from ALMEDIO.

Specifically, a software compares two audio files using FFT analysis. The first audio file has been extracted by a normal audio disc. The second one is the result of the extraction of the another disc which hold the same audio track, but it also has specific defects on its surface. The similarity factor of the the two tracks unveils the error correction capabilities of the drive.

The differences between the two compared tracks are translated to a signal (noise) illustrated in the following graphs.

- ABEX TCD-721R

 

Errors total
Num : 1088502
Errors (Loudness)
Num : 55218
Avg : -73,7 dB(A)
Max : -35,2dB(A)
Error Muting
Num : 3478
Avg : 1,0Samples
Max : 8 Samples
Skips
Num : 0
Avg :0.0 Samples
Max 0 Samples
Total Test Result
76,6 points(of 100.0 maximum

The drive's performance on this disc can be commented using the graph above. Error correction is average, starting at the point where the defect is starting to grow, but error hiding mechanisms are not so good. We can tell that by the noise that almost all the time exceeds that -60 db(A) level.

- ABEX TCD-726R

Errors total
Num : 476
Errors (Loudness)
Num : 236
Avg : -82,7dB(A)
Max : -42,8 dB(A)
Error Muting
Num : 10
Avg : 1.0 Samples
Max :1 Samples
Skips
Num :0
Avg :0,0 Samples
Max 0 Samples
Total Test Result
87,8 points(of 100.0 maximum)

Very good performance on this one, with no skips and very few mutings performed.

- 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
1
2
3
4
5
LiteOn DH4B1S
5/5
5/5
5/5
5/5
0/5

A good performance for the DH 4B1S drive here, successfully playing the first 4 tracks.

Summary

Overall, an adequate good error correction mechanisms on CD media.




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