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Natural Science Forum / Physics / Acoustics / February 2008



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Frequency Weighting

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eshameli@gmail.com - 21 Feb 2008 23:41 GMT
Hi there,

I have a very few background in signal processing but I want to apply
a frequency-weighting formula to a signal.

I have the details of that frequency-weighting as bellow:

Freq. Band #          Freq. (Hz)             Wm (dB)
-7                            0.2                          -24.02
-6                            0.25                        -20.05
-5                            0.315                      -16.12
-4                            0.4                          -12.29
-3                            0.5                            -8.67
-2                            0.63                          -5.51
-1                            0.8                            -3.09
 0                            1                               -1.59
1                            1.25                          -0.85
.                               .                                  .
.                               .                                  .

26                           400                         -60.92

Can any body let me know how to apply this function to my discrete
signal?

Thanks,

Ehsan
Greg Locock - 23 Feb 2008 02:22 GMT
eshameli@gmail.com wrote in news:66901421-ab2f-49b5-b3a4-
0ef5045ea59b@q78g2000hsh.googlegroups.com:

> Hi there,
>
[quoted text clipped - 20 lines]
> Can any body let me know how to apply this function to my discrete
> signal?

In the frequency domain you just add the weighting to your power
spectrum, if the latter is in dB.

Or do you mean you want to apply it in the time domain? In the past I've
seen people turn a filter defined in the frequency domain into a FIR.

This may give you enough details:
http://en.wikipedia.org/wiki/Finite_impulse_response

Cheers

Greg Locock
 
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