Re: gamnitude range of a cepstrum

On Aug 29, 2:47=A0pm, "NateS" <m...@xxxxxxxx> wrote:
Hi, I am performing cepstral analysis and everything is working well.
The
only thing I'm unsure about is how to determine the maximum magnitude I
c=
an
see in my cepstrum. I want to ignore peaks that don't have enough
power. =
So
far I have just chosen a threshold that seems to make sense for the
magnitudes I am receiving. However I would like to express the
threshold =
as
a percentage and I'd like it to work properly for an input signal. Is
the=
re
a function that defines what the maximum cepstrum magnitude can be?

Thanks,
-Nate

I dont think there is any limit on cepstrum magnitude.You may want to
express
the threshold as the percentage of the maximum value of cepstrum for
that window.


The point of the threshold is to ignore cepstrum peaks that don't have
enough power. What happens is if the input signal has no harmonics, I am
still processing cepstrum peaks. Is there a standard way of handling this?


My initial reaction was to ignore peaks that don't have much power. For
this to work I need to quantify the cepstrum magnitude. I can't use the
maximum value in the cepstrum window because the whole window might not
have much power.

I suppose another solution might be to take a mean or median or stddev of
the cepstrum and ignore peaks that did not differ by much. But again, I
need to quantify "much". Also I feel like I'm just making this up. :)

This may be naive, but it seems like the magnitude of the cepstrum should
be relative to the numbers use in the input signal, no?

-Nate
.

Relevant Pages

  • gamnitude range of a cepstrum
    ... only thing I'm unsure about is how to determine the maximum magnitude I can ... However I would like to express the threshold as ... a function that defines what the maximum cepstrum magnitude can be? ...
    (comp.dsp)
  • Re: gamnitude range of a cepstrum
    ... only thing I'm unsure about is how to determine the maximum magnitude I can ... I want to ignore peaks that don't have enough power. ... However I would like to express the threshold as ... a function that defines what the maximum cepstrum magnitude can be? ...
    (comp.dsp)
  • Re: gamnitude range of a cepstrum
    ... only thing I'm unsure about is how to determine the maximum magnitude I can ... However I would like to express the threshold as ... a function that defines what the maximum cepstrum magnitude can be? ...
    (comp.dsp)