NEC ND-2510A Recorder -
Page 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:
3081650
|
Errors
(Loudness) dB(A)
|
Num: 130508 |
Avg:
-74.0 dB(A) |
Max:
-35.7 dB(A) |
Error
Muting Samples
|
Num: 9335 |
Avg:
1.0 Samples |
Max: 40 Samples |
Skips
Samples
|
Num: 0 |
Avg:
0.0 Samples |
Max:
0 Samples |
Total Test Result |
69.8 points (out of 100.0 maximum) |
C2 Accuracy |
99.9 % |
At first glance, the performance with this disc does not seem good. Most
drives start producing errors at least after having passed the 12 minute mark.
The total error count is very high, but the maximum loudness error level
of -35.7dB is quite
reasonable
(although
higher than that reported for the ND-2500A) and the muting samples count is
low while there were no skipped samples. The final score of 69.8 is rather
good.
- ABEX TCD-726


Errors total
|
Num:
394060
|
Errors (Loudness) dB(A)
|
Num: 23453 |
Avg:
-77.7 dB(A) |
Max:
-25.1 dB(A) |
Error Muting Samples
|
Num: 1298 |
Avg:
7.7 Samples |
Max:
2946 Samples |
Skips Samples
|
Num: 2 |
Avg:
6.0 Samples |
Max: 6 Samples |
Total Test Result |
71.4 points (out of 100.0 maximum) |
C2 Accuracy |
99.7 % |
The Abex TCD-726 test disc is much easier for drives in general to read. That's
why the ND-2510A performed better than with the previous CD, but again there
is a high total error count and in general there are way too many errors for
this disc. The final score of 71.4 is very low and indicates not very good
performance here.
- 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 being 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
|
|
5/5
|
5/5
|
3/5
|
0/5
|
0/5
|
The drive successfully passed only the first two out of the five check levels
for this test. An average drive
will pass the third level and the better drives will reach the fourth or even
fifth levels. Again, this is very disappointing performance from NEC.
- Summary
Generally we can say that the CD error correction capabilities of the NEC2510A
are average and should be fixed with newer firmware updates...