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From: John Larkin on 20 Feb 2010 00:42
On Fri, 19 Feb 2010 21:02:51 -0800 (PST), Bret Cahill
<BretCahill(a)peoplepc.com> wrote:

>> >There is no reason to smooth after demodulation in some low noise lock
>> >in amplifier situations.
>>
>> >If you are taking the quotient of two signals that are identical
>> >except for magnitude and noise, i.e., shape, frequency and phase
>> >angle, simply low pass integrate each signal after each is multiplied
>> >by the reference.
>>
>> >Once the S/N ratio is high enough simply take the quotient without
>> >wasting time to smooth either signal.
>>
>> >No smoothing of either demodulated signal is necessary because the
>> >rectified humps appear in both the numerator and denominator in phase
>> >and with the same relative size as the quotient.
>>
>> >This is important in low noise situations where there isn't time to
>> >smooth the humps.
>>
>> >This simple filtering solution should be fairly common in electronics.
>>
>> But it's not.
>
>Then it will make a perfect method patent.
>
>

Enjoy!

John

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