Path: news.mathworks.com!newsfeed-00.mathworks.com!nlpi057.nbdc.sbc.com!prodigy.net!border1.nntp.dca.giganews.com!nntp.giganews.com!postnews.google.com!j33g2000pri.googlegroups.com!not-for-mail
From: dbd <dbd@ieee.org>
Newsgroups: comp.soft-sys.matlab
Subject: Re: how to reverse windowing effect?
Date: Tue, 20 May 2008 10:38:55 -0700 (PDT)
Organization: http://groups.google.com
Lines: 42
Message-ID: <f3ce5e12-927a-4e7d-a268-30f1a161352b@j33g2000pri.googlegroups.com>
References: <g0t486$r84$1@fred.mathworks.com> <5e6ebe3f-2a51-4f1a-9987-c86a3ea435e9@q27g2000prf.googlegroups.com> 
NNTP-Posting-Host: 75.17.140.180
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
X-Trace: posting.google.com 1211305136 6109 127.0.0.1 (20 May 2008 17:38:56 GMT)
X-Complaints-To: groups-abuse@google.com
NNTP-Posting-Date: Tue, 20 May 2008 17:38:56 +0000 (UTC)
Complaints-To: groups-abuse@google.com
Injection-Info: j33g2000pri.googlegroups.com; posting-host=75.17.140.180; 
User-Agent: G2/1.0
X-HTTP-UserAgent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.14) 
Bytes: 2996
Xref: news.mathworks.com comp.soft-sys.matlab:469522


On May 20, 7:26 am, "ggk " <ggkm...@comcast.net> wrote:
> Thanks,
>
> Is the Nuttall window you describe above called the
> Blackman-Nuttall window in this link?
>
> http://en.wikipedia.org/wiki/Window_function#Nuttall_window.
> 2C_continuous_first_derivative
>
> The only paper reference I could find on the internet for
> Nuttall was the following:
>
> A.H. Nuttall, &#8220; Some Windows with Very Good Sidelobe
> Behavior&#8221;, IEEE Transactions on Acoustics, Speech, and
> Signal Processing, Volume 29, Issue 1, February 1981, pp.
> 84 &#8211; 91.
>
> Does the paper call it the Nuttall window? Thanks again, GGK

Nuttall calls it the minimum 4-term window. The coefficients are given
in (37) on page 89.

Knowledgeable window selection is about tradeoffs. Nuttall provides
enough examples with parameters to choose the best cosine-summed
window up to 4 terms for most applications.

Nuttall describes so many windows in this and other papers that
'Nuttall window' has no useful descriptive value. The term 'Blackman -
harris' has also been used for enough different things by enough
authors to be meaningless by itself. Your inclusion of "4 term, -92dB"
was quite appropriate and was the needed information that many people
leave off.

Your wki reference is, well, a wiki reference. It has some good
information and more. It references good papers by harris and Nuttall
but the descriptions of the papers show a lack of competence in the
windowing literature and are grossly misleading. So read the
references and take the rest as pretty pictures and probably having
had good intentions. The equations given have probably been copied
accurately. The interpretive comments are dubious.

Dale B. Dalrymple