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Equation 5-20
Correlation Calculation Formula
r V t ( ) V t
(
[
,
+
Signal to Noise Ratio (SNR)
SNR is the measurement ratio between the peak to peak TAA signal and the noise signal
measured in 'rms' from an erased track. The measurement is performed by the parametric
module.
Equation 5-21
SNR
SNR is measured from the equation given above, where
Equation 5-22
Crest Factor
V
ppTAA
maximum voltage for one revolution of the erased track.
Chapter 5
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NT
1
∫
V t ( )V t
------ -
NT
)
0
NT
]
=
----------------------------------------------------------------------------------------------------------------------------
2
[
V t ( )
(
V t ( )
Ð
V t ( )
SNR
=
20
log
CrestFactor
defined as the peak to peak voltage of the TAA. V
Measurement Parameter Definition
(
) t d
V t ( )V t
(
+
NT
Ð
2
2
)
]
[
(
)
(
Þ
V t
+
NT
Ð
NT
1
∫
V t ( )
V t ( ) t d
=
------ -
NT
0
NT
1
2
2
∫
V t ( )
=
------ -
t d
NT
0
V
ppTAA
--------------------- -
V
rmsNoise
V
MaxNoise
=
----------------------- -
V
ppTAA
MaxNoise
Measurement Definition
)
+
NT
2
(
)
)
]
V t
+
NT
is defined as the
261
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