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CATS move to 6X CAV - 6/23/2004 3:54:40 AM   

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Joined: 4/28/2004
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Here is some good information about improvements of CATS SA300 system:

DVD HIGH-SPEED PARAMETERS – optimize your media for high-speed performance

With the High Speed Parameter (HSP) upgrade for DVD-ROM and DVD±R/RW AudioDev’s analyzers will further help manufacturers and developers to optimize media and drives for high-speed performance, witch means identifying issues that affect playability when the playback speed for the disc is above reference speed, 1x.

To help you identify high-speed problems, we have implemented new parameters as well as further developed and refined already existing ones. Included in the HSP package is a new measurement method called 3000 rpm CAV. The method can test the disc at high speed in regards to focus and tracking performance resulting in three new parameters - Axial CAV, AxialN CAV and Radial CAV. Also implemented are a number of new and re-defined parameters that highlight the disc’s high-speed performance. These additional parameters are measured at reference speed and the measurements are done at the same time as the normal measurements.The HSP package is a ‘per drive’ upgrade, which means that individual drives are upgraded, not the whole system.

3000 RPM CAV
3000 rpm CAV is a new tracked measurement performed at constant angular velocity (CAV). This means that the disc will start reading at about 2x at the inner diameter and end at about 6x speed at the outer diameter of the disc. This new measurement method is done in addition to the normal measurements. 3000 rpm CAV can be defined as a partial test, quick test or a complete test on both recorded and unrecorded discs. Tests can be included in the test templates already being used in your CATS system today. A complete test of one information layer using 3000 rpm CAV takes roughly fifteen minutes.

When the CATS analyzer performs the 3000 rpm CAV test, only the focus and tracking parameters mentioned below are measured. This new measurement method is part of the test specifications for DVD+R discs >4x, but is also useful for any DVD media intended for recording or playback at high speed. The higher test speed makes it possible to ignore servo signal phenomenon that disappear at high speed as well as to be able to detect servo signal phenomenon that only appear at high speed.

Axial tracking
• Axial CAV (Focus error below 10kHz)
• AxialN CAV (error below 10kHz normalized with radius)

Radial tracking
• Radial CAV (Tracking error below 10kHz)

The parameters Axial CAV and Radial CAV can also be presented as Surface Presentation to get a quick overview of where the problem is located on the disc. Surface Presentation is a very valuable tool to pinpoint defects and manufacturing char-acteristics that appear when the disc is tested at high speed.

Average value of Radial 1 can be shown as a Surface Presentation to get a quick overview of where the problem is located on the disc. This is a very valuable tool to pinpoint low-frequency defects.

The specified parameter that monitors focus performance is measured as FE, Focus Error. The specified parameter, FE, is as per the DVD specification measuring the remaining focus error in the frequency below 10kHz. To keep track of the vertical oscillation of the focal lens we have made it possible to look at focus errors at different frequencies in much the same way as it is done on the tracking side (i.e. Radial 1 and Radial 2). FE1 is a new parameter showing the focus error below 1.1kHz measured using a reference servo. With FE1 it is possible to more clearly detect focus defects in the lower frequency range.

FE2 is a new parameter that works in the frequency band between 1.1 and 10kHz.To further improve the parameter we have added a RMS filter, which can be turned on or off depending on your needs. FE2 makes it possible to more clearly detect focus defects in the higher frequency range.

Radial averaging is now available for Radial 1 and FE1. Choose between 1-8 revolutions to achieve the averaging of your choice. This is one way to eliminate external noise and disturbances in the measurements.

The HSP upgrade can be made on the following CATS Analyzers
• DVD Pro
• DVD 2x
• DVD +R/RW Pro
• DVD –R/RW Pro

• Axial CAV Focus error at 3000 rpm CAV
• AxialN CAV Focus error at 3000 rpm CAV, normalized with radius
• Radial CAV Tracking error at 3000 rpm CAV
• FE1 Focus Error <1,1kHz
• FE2 Focus Error 1,1-10kHz

Selectable radial averaging (1-8 revolutions) of:
• Radial 1
• FE1

Surface Presentations
• Axial CAV
• Radial CAV
• Radial 1

< Message edited by emperor -- 6/23/2004 2:30:38 PM >
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[Deleted] - 6/23/2004 4:31:53 AM   
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