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'digest reader and 60Hz notch'
1999\03\31@133159 by Mik Kim

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Dear Picers,

I subscribe to digest mode to avoid having tons of separate e-mails.
However, it's not easy to read and navigate through the messages. Is
there a way using "free" software to easily view the messages? If not,
perhaps that's something I can work on as my day job and keep working at
MacDonalds at night.

As an example, I read about someone having 60Hz notch filter difficulty
with ECG (or some medical use), but I can't find the message to reply
back now. Anyway, here's my 1/.618 cents worth.

Someone suggested using opamp. This will not work; for such small input
signal, the 60Hz will totally dominate. YOu will need many orders for
analog filter. You might be able to make ellitical / Cauer filter to
notch exactly at 60Hz, but component tolerance and mismatch won't make
this too effective.

A better way is to digitize the signal (use PIC with ADC) and make a
filter (probably FIR since it's easier) and make sure the zero of the
filter falls exactly on 60Hz. Since only one zero (actually 2 for + and
- freq) is needed, computation needed for this is minimal, although
multiplication with PIC 16/12 is a pain.

Gosh, this is very interesting problem. Oh well, no time for that; back
to making french fries...
Get Your Private, Free Email at http://www.hotmail.com

1999\03\31@134227 by Andy Kunz

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>there a way using "free" software to easily view the messages? If not,
>perhaps that's something I can work on as my day job and keep working at
>MacDonalds at night.

Download Eudora Light from http://www.qualcomm.com

1999\03\31@141756 by Gerhard Fiedler

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At 13:41 03/31/99 -0500, Andy Kunz wrote:
>>there a way using "free" software to easily view the messages? If not,
>>perhaps that's something I can work on as my day job and keep working at
>>MacDonalds at night.
>
>Download Eudora Light from http://www.qualcomm.com

yes (it's free, not only light :), and set up different "mailboxes" and
filters to put your piclist messages automatically in one (and OT msgs in
another one, if you like :)

ge

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