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Appeared on: Monday, January 13, 2003
Jitter Tests


1. Introduction

Jitter Tests - Page 1

This article contains the following tests:

- Introduction

In order to compare Plextor's VariRec, YAMAHA's AudioMASTER and TEAC's "4X Boost" technologies we burned using the same disc type:

RITEK 80min 48X (JS Type)
Code : 97m15s17f
Disc Type : CD-R
Recording Layer : Dye Type 7: Short Strategy (Phthalocyanine)
Capacity : 79:59.70 (703 MB)

, the same amount of data (80:07:44), with the following drives:

All discs measured with LEADER LE-1853 CD/DVD Analyzer using the SEISANKA CD-ROM reader calibrated with Philips Calibration JT.1 test disc. The correlation factor for the 3T Land is 0.9975, while for the 3T Pits is 0.998. The reading speed for all discs was 1X.

The PleXWriter PX-W4824A and TEAC CD-W540E can write the full capacity of the used media (80mins), while the YAMAHA CRW-F1E only 67mins (due to higher pits length). That's why the YAMAHA graphs stop at 67mins. In addition, we burned two discs under the AudioMASTER, one at 8X and one at 4X to see if there the recording speed does affect or not the AudioMASTER technology.

The three technologies promise optimal results at the 4X writing speed, lets see if this is true!


2. 3T Pit Results

Jitter Tests - Page 2

3T Pit Results

The results show that the YAMAHA CRW-F1E has the lowest 3T Pit jitter. The recording speed (4X, 8X) does seem to affect the 3T Pit jitter (22.91ns average for 4X, 24.88ns average for 8X). YAMAHA comments that the 4X speed is the optimal with the RITEK JS Type media and the drive has this information in firmware. When user chooses the "BestWriteSpeed" setting, the CRW-F1E series will write at 4X, not at 8X, producing the lower Jitter values.

The TEAC CD-W540E 4X boost function gives an average 24.49ns jitter, while PleXWriter PX-W4824A VariRec +0 mode produced higher 3T Pit jitter than the two other technologies (27.39ns average).

Comparing the three technologies with the normal 4X writing speed, we notice that with the RITEK JS Type media, the YAMAHA's AudioMASTER 4X speed produced the best results (22.91ns). The CRW-F1E 4X and TEAC's "4X Boost" speeds sharing the second place (24ns). The AudioMASTER at 8X produced higher Jitter (24.88ns) than TEAC's CD-W540E 4X writing speed (24.98ns). Lastly, Plextor's VariREC +0 function does seem to affect negative the 3T Pit Jitter since the average Jitter is 27.39ns vs. 26.88ns of the normal 4X writing speed.


3. 3T Land Results

Jitter Tests - Page 3

3T Land Results

The above graph shows the 3T Land jitter. The YAMAHA CRW-F1E has the lowest jitter in either 4X or 8X writing speeds (24.91ns for 4X, 26.79ns for 8X). The TEAC CD-W540E comes third with a 30.49ns and the PleXWriter PX-W4824A last with a 31.39ns (average).

Comparing the three technologies with the normal 4X writing speed, we notice that again YAMAHA's AudioMASTER 4X speed produced the best results (24.91ns). The AudioMASTER 8X speed gets the second place with 26.79ns, while the CRW-F1E's 4X normal speed had the same 3T Land Jitter as with TEAC's CD-W540E "4X Boost" (28.98ns). The TEAC CD-W540E 4X normal writing produced higher Jitter than the "4X Boost" and again, Plextor's VariRec +0 produced worst results than the PX-W4824A 4X writing speed.


4. Conclusion

Jitter Tests - Page 4

Conclusion

After the test results, its clear than YAMAHA's AudioMASTER Pro technology does work reducing the 3T Pit&Land Jitter compared with the 4X writing speed. YAMAHA promises 30% less Jitter that wasn't confirmed from the test results, at least with the RITEK JS type media. The biggest improvement comes at the 3T Land Jitter with a 14% improvement:

TEAC's CD-W540E "4X Boost" function worked well and reduced Jitter up to 8%!

Plextor's VariREC +0 function produced worst results than the normal 4X writing speed which is at least strange…

The AudioMASTER and TEAC's "4X Boost" technologies produced good results as each manufacturer was promised. Both technologies will reduce Jitter (especially the 3T Land values). The CRW-F1E under AudioMASTER will write less data (68mins with 80min CDs), than the other two technologies which is a drawback.

Of course even at the 4X normal writing mode, the CRW-F1E is still better than both CD-W540E and PX-W4824A. Using a 90min disc will allow writing up to 74mins that solves the problem, partially. The 1X writing speed mode didn't tested since 1X writing can be considered as very slow.

Future tests will revile if the used media affects the performance of each Jitter reduction technology...

Below are the results from all modes:

Drive
Mode
3T Pit Jitter
3T Land Jitter
YAMAHA CRW-F1E
4X
24.00
28.98
AAMR 4X
22.91
24.91
AAMR 8X
24.88
26.79
PleXWriter PX-W4824A
4X
26.88
30.00
VariREC +0
27.39
31.39
TEAC CD-W540E
4X
24.98
31.51
4X Boost
24.00
28.98

5. AudioMASTER in depth - Page 1

Jitter Tests - Page 5

AudioMASTER in depth

After compared the three technologies we decided to test AudioMASTER and VariREC technologies in depth. For that purpose, we used a very well known media, That's 80min 48X certified with the following media information:

Manufacturer: Taiyo Yuden
Code: 97m24s01f
Recording Layer: Dye Type 1: Long Strategy (Cyanine, AZO)
Capacity: 79:59.72 (703 MB)

We burned the same amount of data, with the same drive (YAMAHA CRW-F1E, firmware v1.0f); from the same media batch (spindle 50 pieces). Under normal recording mode (DAO), the data was 80:07:43mins, while under AudioMASTER mode 67:07:42mins.

3T Pit Results

The above graph shows how the 3T Pit Jitter changes according to the selected AudioMASTER recording speed. It's clear that the 1X writing speed will produce the worst results, while the 4X recording speed the best. The 8X recording speed will produce the same 3T Pit Jitter at the whole disc area.

Let's now see how the 3T Jitter chances when recording under DAO (normal) mode. The 1X recording speed produced the best results.

The above graph shows the average 3T Pit Jitter from the special and normal recording modes. The best results come from the AudioMASTER at 4X recording speed. The AudioMASTER 8X come second, while the 1X normal speed third. The AudioMASTER 1X recording speed won't produce very well results as someone may expect.


6. AudioMASTER in depth - Page 2

Jitter Tests - Page 5

AudioMASTER in depth - Page 2

3T Land Results

At the 3T Land Jitter, things are a little different. The 8X recording speed produced the lowest Jitter values, while the 1X recording speed again produced the worst.

At the normal recording mode, the 1X recording speed, still produces the lowest 3T Land Jitter.

The above graph shows the average 3T Land Jitter from the special and normal recording modes. The best results come from the AudioMASTER at 8X recording speed, while the AudioMASTER 4X come second. The 3T Land under AudioMASTER or normal recording modes is almost equal.


7. AudioMASTER in depth - Page 3

Jitter Tests - Page 6

AudioMASTER in depth - Page 3

- Conclusion

Mode
Recording Speed
3T Pit Jitter
>35ns
Max value
AudioMASTER
1X
28.32
No
31
4X
20.91
24
8X
25.00
25
Normal (DAO)
1X
26.05
27
4X
27.02
28
8X
30.02
31

Mode
Recording Speed
3T Land Jitter
>35ns
Max value
AudioMASTER
1X
30
No
32
4X
26.41
28
8X
24.09
30
Normal (DAO)
1X
29.95
30
4X
32.05
33
8X
29.93
30

With That's 80min 48X media, the best results at 3T Pit&Land Jitter values come from the 4X recording speed. The 8X recording speed will produce worst 3T Pit but better 3T Land Jitter results. The 1X recording speed under AudioMASTER will not produce well results. This may be a problem with the specific media, but anyway, 1X recording speed is slow. On the other hand, under normal recording mode (DAO), the 1X recording speed produced the best results!


8. VariREC in depth - Page 1

Jitter Tests - Page 8

VariREC in depth - Page 1

- Introduction

After compared the three technologies we decided to test AudioMASTER and VariREC technologies in depth. For that purpose, we used a very well known media, That's 80min 48X certified with the following media information:

Manufacturer: Taiyo Yuden
Code: 97m24s01f
Recording Layer: Dye Type 1: Long Strategy (Cyanine, AZO)
Capacity: 79:59.72 (703 MB)

We burned the same amount of data (80:07:43), with the same drive (PleXWriter PX-W4824A, firmware v1.03); from the same media batch (spindle 50 pieces).

3T Pit Results

The above graph shows the 3T Pit Jitter effect of various VariREC settings (+0. -2, +2) compared with the 4X normal recording speed. The worst results come from the +2 setting, while the best results from the +0, 4X normal speeds.

The above graph shows the 3T Pit average Jitter from all VariREC settings (-2, -1, +0, +1, +2) compared with the 4X normal (DAO) speed. The 4X recording speed produced the best results, +0 setting comes second, while the +2 setting the worst.


9. VariREC in depth - Page 2

Jitter Tests - Page 9

VariREC in depth - Page 2

3T Land Results

The best results come from the 4X normal recording speed. Again the +2 setting won't produce very well results.

The lowest 3T Land Jitter comes from the 4X normal speed. The two extreme values (+2, -2) will give also extreme results, but of course Plextor also suggests to avoid them.

- Conclusion

Mode
Recording Mode
3T Pit Jitter
>35ns
Max value
VariREC
-2

28.10

No
29
-1
27.05
28
+0
26.44
28
+1
28.20
30
+2
31.37
32
Normal (DAO)
4X
26.22
28

Mode
Recording Mode
3T Land Jitter
>35ns
Max value
VariREC
-2
33.61
Yes at 4mins
36
-1
32.07
No
34
+0
32.10
No
34
+1
32.39
No
34
+2
33.85
Yes at 0mins
36
Normal (DAO)
4X
30.90
No
34

As we had seen with the RITEK JS type media, VariREC won't improve the 3T Jitter compared with the normal 4X recording (DAO) speed. In case of using the extreme values (+2, -2) the disc will exceed the 35ns limit!


10. Comparing recording speeds

Jitter Tests - Page 10

Comparing recording speeds

- Introduction

The need for speed has pushed manufacturers to offer up to 52X recording speeds. Most manufacturers allow AudioCD authoring in maximum speeds of 52X that makes interesting to test, what Jitter levels various 52X recorders produce using 48X certified media. We also are comparing how the latest PleXWriter PX-W4824A recorder performs at the various recording speeds (4X~48X) and how a speed selection will affect the Jitter values.

- Used media (for PX-W4824A 4-24X)

RITEK 80min 48X (JS Type)
Code : 97m15s17f
Disc Type : CD-R
Recording Layer : Dye Type 7: Short Strategy (Phthalocyanine)
Capacity : 79:59.70 (703 MB)

- Used media (for PX-W4824A 32X-48X)

CMC Magnetics 80min 48X
Code : 97m26s66f
Disc Type : CD-R
Recording Layer : Dye Type 6: Short Strategy (Phthalocyanine)
Capacity : 79:59.71 (703 MB)


11. PX-W4824A (4X-24X)

Jitter Tests - Page 11

PX-W4824A (4X-24X)

3T Pit Results

The 3T Jitter values are affected from the writing speed. The best results come from the lowest recording speed (4X). The incensement of writing speed does affect the Jitter values as the above graph shows. The differences between each recording speed can be found below (average values). The 24X writing speed has a 32.56ns while the 4X 26.88ns (17.44% difference). The rest recording speeds (8X/16X/20X) are very close.

3T Land Results

The 3T Land values are affected less from the writing speed. The difference between 24X and 4X is now only 5.45%.

To determine which recording speed gives the best results we have to compare each recording's speed overall Jitter and consider the recording time for each speed:

Recording Speed
3T Pit Jitter
3T Land Jitter
Burn Time (secs)
4X
26.88
30.00
1272
8X
31.41
31.56
643
16X
32.10
30.12
342
20X
32.00
30.02
265
24X
32.56
31.73
242

Judging from the test results, the best time/recording speed is the 20X (CLV) speed, while the optimal is the 4X recording speed.


12. PX-W4824A (32X-48X)

Jitter Tests - Page 12

PX-W4824A (32X-48X)

3T Pit Results

The 3T Pit Jitter values from the 32X ~ 48X recording speeds are affected from the incensement of the recording speed. The 48X writing speed exceeds the 35ns limit and at the end of the disc reached 40ns. The PoweREC function affects the Jitter, at least at the maximum speed. The below graph shows the average 3T Pit values:

3T Land Results

The 3T Land values are also affected from the recording speeds. Again the 48X writing speed exceed the 35ns limit value. Disabling the PoweREC function will produce higher 3T Land Jitter. The below graph shows the average 3T Land values:

To determine which recording speed gives the best results we have to compare each recording's speed overall Jitter and consider the recording time for each speed:

Recording Speed
3T Pit Jitter
3T Land Jitter
>35ns
Max
Burn Time (sec)
32X
30.88
29.37
No
31ns
197
40X
32.20
29.78
No
34ns
182
48X
33.66
30.68
Yes at 66mins
40ns
176
48X (PoweRec Off)
32.24
30.10
Yes at 66mins
40ns
176

The maximum recording speed is not suggested for AudioCD authoring; while there will be no problems with the 40X speed. The difference in recording time is low, while the Jitter never exceeds 35ns. As a final note we noticed that disabling PoweREC doesn't affect the writing time, while producing lower Jitter!


13. 48X Writing - Page 1

Jitter Tests - Page 13

48X Writing - Page 1

- Tested drives

- Used media (for all recorders, except PX-W4824A)

RITEK 80min 48X (JS Type)
Code : 97m15s17f
Disc Type : CD-R
Recording Layer : Dye Type 7: Short Strategy (Phthalocyanine)
Capacity : 79:59.70 (703 MB)

- Used media (for PX-W4824A)

CMC Magnetics 80min 48X
Code : 97m26s66f
Disc Type : CD-R
Recording Layer : Dye Type 6: Short Strategy (Phthalocyanine)
Capacity : 79:59.71 (703 MB)


14. 48X Writing - Page 2

Jitter Tests - Page 14

48X Writing - Page 2

3T Pit Results

At the 48X recording speed, the four tested drives, showed a mixed image. The lowest 3T Pit Jitter values come from YAMAHA's CRW-F1E drive with a 30.20ns (average). The below graph shows the average 3T Pit Jitter of various 48X writers, with RITEK JS type media.

3T Land Results

At the 3T Land Jitter, the PleXWriter PX-W4824A gets the first place with 30.68ns (average). The below graph shows the average 3T Land Jitter of various 48X writers, with RITEK JS type media.

Conclusion

All drives passed the 35ns Jitter limit in either Pits or Lands area. The CRW-F1E has the lowest average Jitter (31.15ns) and the max value is 36ns. The PX-W4824A gets the second place with 32.17ns and the CyberDrive CW088D the third place with 33.31ns. The rest three drives exceed 40ns at various points, especially at the outer limits of the disc. Remember that Jitter effects above 35ns are exponential, meaning there is a big difference between 36 and 40ns values.

Drive
3T Pit Jitter
3T Land Jitter
>35ns
Max
Burn Time (sec)
ASUS CRW4816A
37.66
38.95
Yes at 44mins
48ns
162
CyberDrive CW088D
33.10
33.51
Yes at 74mins
36ns
159
PleXWriter PX-W4824A
33.66
30.68
Yes at 66mins
40ns
176
YAMAHA CRW-F1E
30.20
32.10
Yes at 31mins
36ns
188
LiteOn LTR-48246S
33.71
35.95
Yes at 58mins
42ns
158
TEAC CD-W548E
38.22
39.61
Yes at 16mins
46ns
152

15. 52X Writing - Page 1

Jitter Tests - Page 15

52X Writing - Page 1

- Tested drives

- Used media

RITEK 80min 48X (JS Type)
Code : 97m15s17f
Disc Type : CD-R
Recording Layer : Dye Type 7: Short Strategy (Phthalocyanine)
Capacity : 79:59.70 (703 MB)

 


16. 52X Writing - Page 2

Jitter Tests - Page 16

52X Writing - Page 2

- 3T Pit Results

The lowest 3T Pit Jitter values come from AOpen CRW5224 with a 33.39ns (average). The LiteOn LTR-52246S comes second with 34.34ns, while the ASUS CRW5224 third with 36.80ns. The CyberDrive CW099D comes last with a 44.88ns!

- 3T Land Results

The lowest 3T Land Jitter values come from AOpen CRW5224 with a 32.61ns (average). The LiteOn LTR-52246S comes second with 36.29ns, while the ASUS CRW5224 third with 38.59ns. The CyberDrive CW099D comes last with a 42.27ns!

- Conclusion

All drives passed the 35ns Jitter limit in the Pits area. The AOpen CRW5224 is the only drive that didn't passed the 35ns limit, only at the 3T Land values. The CRW5224 has also the lower average Jitter (33ns)...

Drive
3T Pit Jitter
3T Land Jitter
>35ns
Max

Burn Time (sec)

CyberDrive CW099D
44.88
42.27
Yes at 0mins
60ns
152
AOpen CRW5224
33.39
32.61
Yes at 60mins
39ns
149
LiteOn LTR-52246S
34.34
36.29
Yes at 15mins
42ns
149
ASUS CRW5224
36.80
38.59
Yes at 0mins
41ns
188


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