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on Sep 14, 2007
on Oct 24, 2007 by hopcraft
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Does any one know how to create pre-emphasis from two pattern generators?
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Oct 24, 2007 4:28 PM
In general, pre-emphasis can be any intentional distortion designed to maximize total system performance. To do this you need to understand the primary noise contributions in your total system.
The most common use of the term is in FM signals. You will be increasing the power of higher-frequency signals relative to lower-frequency signals, because the higher-frequency signals are more likely to get distorted by noise (so increasing the higher-frequency signals effectively increases your signal-to-noise ratio of your overall system). Obviously, when you do this, your receiver needs to do the inverse of this process to recapture the original signal. The action of the receiver is called Deemphasis.
If you have a known receiver (such as an FM radio), you will need to match the deemphasis in the receiver. If you are setting up your own receiver, you can set any transfer function that emphasizes the higher-frequency signal.
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