[SI-LIST] Re: TO define the "Preemphasis"
- From: "Ismail B - CTD, Chennai." <ismailb@xxxxxxxxxxxxxxx>
- To: ismailb@xxxxxxxxxxxxxxx, hpc@xxxxxxxxxx
- Date: Sat, 6 Jul 2002 11:07:37 +0530
Hupeng,
Just to add one more point.
Why does pre-emphais increases the magnitude of higher frequencey components
?
The catch here is, power sprectral density of noise increases with square of
frequency. Hence
to get more noise immunity it will be better if we increase the PSD of
higher frequencies.
Thanks,
Ismail
-----Original Message-----
From: Ismail B - CTD, Chennai. [mailto:ismailb@xxxxxxxxxxxxxxx]
Sent: Friday, July 05, 2002 4:40 PM
To: hpc@xxxxxxxxxx
Cc: SI_LIST (E-mail)
Subject: [SI-LIST] Re: TO define the "Preemphasis"
Hupeng,
Preemphasis is a sort of amplifying the magnitude of a band of frequencies
such that the signal to noise ratio is improved. Preemphasis is generally
done in FM transmission (before modulation)where the higher frequencies are
amplified to get more noise immunity. At the recevier end deemphasis should
be done to cancel the effect of preemphasis. If the serdes you use works in
serial mode it is basically dealing with a FM signal. Hence, the same
concept can be applied.
Thanks,
Ismail
-----Original Message-----
From: hpc@xxxxxxxxxx [mailto:hpc@xxxxxxxxxx]
Sent: Friday, July 05, 2002 3:48 PM
To: SI_LIST (E-mail)
Subject: [SI-LIST] TO define the "Preemphasis"
Hi all:
In the Serdes design,the Preemphasis function is used .who can explain
"Preemphasis" function in detail?
TIA
Hupeng
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