Hi David, Aldo,
Thanks for the great article and the comments. Yes, windowing helps remove
the Gibbs effects. But I have two concerns:
1. The raised cosine (or other types of windows) actually boosts the LF
part of the IL while suppressing the HF part. This alters the original
behavior of IL, causing lowered peak value of the impulse response.
2. Ideally, the impulse response should be "one-sided", ie, all response
prior to time 0 should be nil.
I did some experiments and felt that windowing might not be the best way to
obtain a good, causal impulse response. Correct me if not the case...
Best Regards,
Tramp
On Tue, Aug 25, 2020 at 7:13 PM Morales, Aldo W <awm2@xxxxxxx> wrote:
This is what we get without any windowing. You can obtain the intrinsec
time delay and compare it with a TDR.
Stay safe and healthy,
Aldo
_____________________________________________________________________________________________
Aldo W. Morales, Ph.D. IEEE Senior Member
IEEE Consumer Electronics Society 15-16 Distinguished Lecturer
Co-Director, Center of Excellence in Signal Integrity
<http://www.hbg.psu.edu/csi>
https://harrisburg.psu.edu/center-for-signal-integrity
Professor of Electrical Engineering
Penn State Harrisburg
777 West Harrisburg Pike
Middletown, PA 17057
U.S.A.
Phone: (717)-948-6379
Fax: (717)-948-6352
------------------------------
*From:* si-list-bounce@xxxxxxxxxxxxx <si-list-bounce@xxxxxxxxxxxxx> on
behalf of David Banas <capn.freako@xxxxxxxxx>
*Sent:* Tuesday, August 25, 2020 12:18 PM
*To:* farhilltramper@xxxxxxxxx <farhilltramper@xxxxxxxxx>
*Cc:* si-list@xxxxxxxxxxxxx <si-list@xxxxxxxxxxxxx>
*Subject:* [SI-LIST] Answer to your previous question, re: converting
Touchstone insertion loss data to channel impulse response.
Hi Tramp,
Sorry for the delay in responding to your original query, which you posted
back in June.
I had to wait until the article went live, which just happened today.
Here is a fairly detailed answer to your original query, re: the correct
way to convert Touchstone insertion loss data into the channel impulse
response:
https://nam01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.signalintegrityjournal.com%2Farticles%2F1847-impulse-response-from-insertion-loss&data%7C01%7Cawm2%40psu.edu%7C42eeb17a09e64dbd836408d84912f828%7C7cf48d453ddb4389a9c1c115526eb52e%7C0%7C0%7C637339693111747027&sdata=Hu3Fl%2B9EDR4xO2%2Bbu%2BycpRCwOvuEjtoFMm%2FLzAxsYkY%3D&reserved=0
<
https://nam01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.signalintegrityjournal.com%2Farticles%2F1847-impulse-response-from-insertion-loss&data%7C01%7Cawm2%40psu.edu%7C42eeb17a09e64dbd836408d84912f828%7C7cf48d453ddb4389a9c1c115526eb52e%7C0%7C0%7C637339693111747027&sdata=Hu3Fl%2B9EDR4xO2%2Bbu%2BycpRCwOvuEjtoFMm%2FLzAxsYkY%3D&reserved=0
Be sure to click on the Jupyter notebook link, at the very end of the
article, as it allows much further exploration of this topic than I was
able to cover in the article, due to space constraints.
Regards,
-db
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