In my filter specs, the passband gain is given as 6.02db. How do I achieve this?
Usually all texts give the passband gain as 0db (as well as passband ripples if any).
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Low pass fir filter with non-unity gain
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This simply means that you have a non-unity gain in the passband. The number 6.02 in decibels corresponds to a multiplicative gain factor of two. You can check it like so:
$$10^\tfrac{6.02}{20} = 2 $$
All you have to do then is multiply all you FIR filter coefficients by 2.
answered Apr 25 at 10:31
Phonon
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1,2551932
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Just multiply your FIR coefficients by 2. You can verify your passband gain at DC by setting $z=1$ which amounts to just summing the coefficients.
answered Apr 25 at 6:15
niaren
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Low pass fir filter with non-unity gain
up vote
14
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In my filter specs, the passband gain is given as 6.02db. How do I achieve this?
Usually all texts give the passband gain as 0db (as well as passband ripples if any).
asked Apr 25 at 4:36
saggy
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This simply means that you have a non-unity gain in the passband. The number 6.02 in decibels corresponds to a multiplicative gain factor of two. You can check it like so:
$$10^\tfrac{6.02}{20} = 2 $$
All you have to do then is multiply all you FIR filter coefficients by 2.
answered Apr 25 at 10:31
Phonon
1,2551932
1,2551932
It should be $10^{\frac{6.02}{20}} = 2$ because we're talking dBs. - Matt L. Apr 25 at 10:35
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