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Terms you may hear about CD Quality
Pre-gap - Before the
data is written an area of "zeros" is written to
the disc
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Post gap - At the end of
the data there is an area of "zeros" writing as
the lead out.
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BLER - Block Logical Error
Rate, measures the error rate to the error correction
circuitry.
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Jitter - Instantaneous and
averages on the variations in the time position of the
data.
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Burst - There errors show
seven or more frames contain errors in a successive
sequence.
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E11, E21, and E31 - These
are the error rates for one error, two errors, or more
errors in each at the first level of error correction.
E12, E22 and E23 would be the same type of errors at the
second level of error correction.
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Reflectance - measures the
reflectivity of the metallic coating by measuring the data
signal.
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Radial Tracking - measures
the slope of hte low frequency tracking signal.
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Radial Noise - Measures the
high frequency changes.
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Radial Eccentricity -
Meaures the radial runout on the tracks.
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HF - Measures the
peak-to-peak data signal a the highest data frequency, 3T
and the lowest data frequency, 11T
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Asymmetry - Looks at the
positive data signal with respect to the decision level to
negative data signal levels with respect to the same
decision level.
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Cross Talk - The ratio of
off-track HF signal amplitude to the on-track amplitude of
the laser.
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2002-03 CD Solutions Inc., All Rights Reserved.
Apollo,
Apollo II, Analog to digital, Orbit, Orbit I |
