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Subject: Tftb-help Digest, Vol 2, Issue 6
Date: 21 Apr 2006 09:07:52 -0700
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Today's Topics:
1. RE: Tftb-help Digest, Vol 2, Issue 5 (jocelyn lu)
2. Re: RE: Tftb-help Digest, Vol 2, Issue 5 (Eric Chassande-Mottin)
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Message: 1
Date: Fri, 21 Apr 2006 19:21:26 +0800
From: "jocelyn lu" <address@hidden>
Subject: [Tftb-help] RE: Tftb-help Digest, Vol 2, Issue 5
To: address@hidden
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Hi,
Is there anybody could help to explain tfrstft?why using frequency
smoothing
window H, instead of time smoothing window based on the STFT time-domain
equation? And why choose the window size as /4?
thanks,
Jocelyn
>From: address@hidden
>Reply-To: address@hidden
>To: address@hidden
>Subject: Tftb-help Digest, Vol 2, Issue 5
>Date: 20 Apr 2006 09:07:49 -0700
>
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>Today's Topics:
>
> 1. Re: known bug of tfrview for MAC users. (Eric Chassande-Mottin)
>
>
>----------------------------------------------------------------------
>
>Message: 1
>Date: Thu, 20 Apr 2006 12:26:18 +0200 (CEST)
>From: Eric Chassande-Mottin <address@hidden>
>Subject: Re: [Tftb-help] known bug of tfrview for MAC users.
>To: address@hidden
>Message-ID: <address@hidden>
>Content-Type: TEXT/PLAIN; charset=US-ASCII
>
>
> > Hello, it seems that there is the same problem when running the
> > TFTB on Windows 2000 with Matlab 6.5 and more high version. Is it
right?
>
>no. as far as I know, no win users has complained up to now.
>if you observed this, please file a bug report or subscribe
>to tftb-help and give a complete description of the problem
>including details of your config (computer/sysop/mat or oct ver)
>and a small script to reproduce the problem.
>
>don't forget to download the lastest version tftb-0.1 from
>tftb.nongnu.org.
>
>eric.
>
>
>
>
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Message: 2
Date: Fri, 21 Apr 2006 13:58:24 +0200 (CEST)
From: Eric Chassande-Mottin <address@hidden>
Subject: Re: [Tftb-help] RE: Tftb-help Digest, Vol 2, Issue 5
To: jocelyn lu <address@hidden>
Cc: address@hidden
Message-ID: <address@hidden>
Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed
Hi,
> Is there anybody could help to explain tfrstft?why using frequency
smoothing
> window H, instead of time smoothing window based on the STFT time-domain
> equation?
TFRSTFT Short time Fourier transform.
[TFR,T,F]=TFRSTFT(X,T,N,H,TRACE) computes the short-time Fourier
transform of a discrete-time signal X.
X : signal.
T : time instant(s) (default : 1:length(X)).
N : number of frequency bins (default : length(X)).
H : frequency smoothing window, H being normalized so as to
be of unit energy. (default : Hamming(N/4)).
I think you are misled by the termilogy of the above online help. the
input parameter H of tfrstft is the analysis window in the _time_ domain.
In fact, the terms of the online help of tfrsp should be used here
instead, namely
H : analysis window, H being normalized so as to
be of unit energy. (default : Hamming(N/4)).
I guess the words "frequency smoothing" were meant here to explain that
this window produces some kind of smoothing in the frequency domain.
see http://gdr-isis.org/tftb/tutorial/node22.html
I'll fix the CVS version if agreed by all developers.
> And why choose the window size as /4?
i think that it is an arbitrary choice. by experience, it gives reasonable
in many practical cases.
eric.
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