> Hi All,
>
> i was going through DSP book by proakis, there i came across
> the following realted to for which sampling frequency what is the fft
> lenght to be used like,
>
> Sampling Freq FFT Length
> 8KHz 256
> 22KHz 512
> 32KHz 1024
> 44.1/48KHz 2048
>
> My query is on what basic the fft length is calculated related to
> the sampling frequency?????? but my understanding is it only depends
> upon the frequency resolution required.
Note that the duration of the analyzed signal is about as constant as
powers of two can accomplish. In other words, the bin spacing in Hz
varies little from one case to the next. Perhaps that property is
relevant for the application.
Jerry
--
"The rights of the best of men are secured only as the
rights of the vilest and most abhorrent are protected."
- Chief Justice Charles Evans Hughes, 1927
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Reply by stereo●September 26, 20062006-09-26
Hi Prasad,
it could help to explain the table to you if you would specify the
book's edition number and the page where you found the table, table
number or section number, something like this. On first look, it
doesn't make sense to me without other definitions connected to the
values.
stereo
mailprassi@gmail.com wrote:
> Hi All,
>
> i was going through DSP book by proakis, there i came across
> the following realted to for which sampling frequency what is the fft
> lenght to be used like,
>
> Sampling Freq FFT Length
> 8KHz 256
> 22KHz 512
> 32KHz 1024
> 44.1/48KHz 2048
>
> My query is on what basic the fft length is calculated related to
> the sampling frequency?????? but my understanding is it only depends
> upon the frequency resolution required.
>
> looking for the reply,
>
> with regards,
> Prasad
Reply by Rune Allnor●September 26, 20062006-09-26
mailprassi@gmail.com skrev:
> Hi All,
>
> i was going through DSP book by proakis, there i came across
> the following realted to for which sampling frequency what is the fft
> lenght to be used like,
>
> Sampling Freq FFT Length
> 8KHz 256
> 22KHz 512
> 32KHz 1024
> 44.1/48KHz 2048
>
> My query is on what basic the fft length is calculated related to
> the sampling frequency?????? but my understanding is it only depends
> upon the frequency resolution required.
This has to depend on the application. A table like this doesn't make
sense unless there are some established rules for what is "sufficient
quality" of some sort.
Is this table given in a context that might make sense? Form some
of the sampling rates, I'd guess the application could be some sort
of audio or speech processing?
Rune
Reply by ●September 26, 20062006-09-26
Hi All,
i was going through DSP book by proakis, there i came across
the following realted to for which sampling frequency what is the fft
lenght to be used like,
Sampling Freq FFT Length
8KHz 256
22KHz 512
32KHz 1024
44.1/48KHz 2048
My query is on what basic the fft length is calculated related to
the sampling frequency?????? but my understanding is it only depends
upon the frequency resolution required.
looking for the reply,
with regards,
Prasad