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> On Tue, 10 Aug 2010 08:19:32 -0700 (PDT), "kris duff" said:
>> Hello,
>>
>> My colleage told me about a smoothing/lpf formula which is :
>>
>> a(n) =3D {a(n-1) * param + ADC} / {param + 1}
>>
>> which=20
>> ADC is the signal from adc
>> a(n-1)  is the result of the last call to this formula
>> the param is the part I don't understand.
>>
>> Is there anybody knows where this formula comes from ?
>>
>> it seems to work well for smoothing, but I want to tweek the param (
>> which is certainly for the bandwith )
>>
>> Thank you
>=20

If I were you, I'd get reading =3D]

A really good introduction is the book: "The Scientist and Engineers
Guide to DSP". Chapter 14 onwards deals with digital filters.

If you've not used DSP before I highly recommend that you read from the
beginning. It's not hard work with that book--it's written so you can
delve in straight away.

The best part is it's free to view online:
http://dspguide.com/


- --=20
Brendan Gillatt | GPG Key: 0xBF6A0D94
brendan {a} brendangillatt (dot) co (dot) uk
http://www.brendangillatt.co.uk
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