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Writing Quality

Jun 17,2002 0

16. Oscilloscope

 

Review Pages

1. Introduction
2. Pits and Lands
3. Error Correction - Page 1
4. Error Correction - Page 2
5. Error Correction - Page 3
6. CIRC - Page 1
7. CIRC - Page 2
8. CD Decoding system
9. C1/C2 Errors - Page 1
10. C1/C2 Errors - Page 2
11. EFM - Page 1
12. EFM - Page 2
13. Jitter - Page 1
14. Jitter - Page 2
15. Jitter - Page 3
16. Oscilloscope
17. Jitter at DVD
18. Technologies for Reducing Jitter
19. JVC ENC K2
20. AudioMASTER
21. VariREC
22. TEAC Boost Function
23. Testing Equipement - Page 1
24. Testing Equipement - Page 2
25. Calibration media
26. Tests before recording
27. Tests after recording
28. Atomic Force Microscopy

 

Writing Quality - Page 15

Oscilloscope

Generally, HF measurements are easier to make on an analog oscilloscope. This is because an analog 'scope shows a multitude of sweeps superimposed, whereas a digital 'scope shows only a "snapshot" of one brief sample. The "Eye Pattern" is what you see on an analog scope. You cannot see this eye pattern on a digital scope. Instead, you see just a sampling of a few pits and lands. A digital 'scope is good for close inspection of individual pits, but what we are interested in is the average values over many pits.

Jitter is a statistical measurement of the variation in pit or land length around the mean value for each run length. For each pit and land length a large number of lengths are measured and the standard deviation is reported.

If the standard deviation is high (greater than 35ns) this can cause instability in the clock and data decoding circuitry on target players and hence reduce the readability of the disc. Once again this parameter is more important when considering CD-ROM discs as these discs are likely to be read in high-speed players.

 

Review Pages

1. Introduction
2. Pits and Lands
3. Error Correction - Page 1
4. Error Correction - Page 2
5. Error Correction - Page 3
6. CIRC - Page 1
7. CIRC - Page 2
8. CD Decoding system
9. C1/C2 Errors - Page 1
10. C1/C2 Errors - Page 2
11. EFM - Page 1
12. EFM - Page 2
13. Jitter - Page 1
14. Jitter - Page 2
15. Jitter - Page 3
16. Oscilloscope
17. Jitter at DVD
18. Technologies for Reducing Jitter
19. JVC ENC K2
20. AudioMASTER
21. VariREC
22. TEAC Boost Function
23. Testing Equipement - Page 1
24. Testing Equipement - Page 2
25. Calibration media
26. Tests before recording
27. Tests after recording
28. Atomic Force Microscopy

 

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