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From: Paul Keinanen
Subject: Re: Receiving multiple ~100kHz time code broadcasts
References: <3D702D9D.6C91CAC1@mfi.net> <3D70D040.DD1FA00A@mfi.net> <firstname.lastname@example.org> <3D74BDD6.F7BB3208@NoSpammingMer-a-tReally.com>
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Date: Wed, 04 Sep 2002 00:14:37 +0300
NNTP-Posting-Date: Wed, 04 Sep 2002 00:09:23 EEST
Organization: Jippii Customer
On Tue, 03 Sep 2002 19:53:09 +0100, email@example.com (Peter) wrote:
> Reagan Thomas wrote:
>>I believe that the signal sampled could be stored using a mathematical
>>representation of the key features on the fly; no need to store all
>>the raw data.
>How could one generate a mathematical representation of a signal
>buried in noise?
>I cannot understand how this can be done, without sampling the signal
>at the required minimum rate (>=2f) and storing the samples.
>Admittedly one could choose to store and process only a small
>timeslice at a time.
I assume this is referring to direct sampling at over 125 kHz.
While the ADC will produce 250 kbytes/s of data, there is no need to
store it all, if the intension is to store a one minute segment for
correlation of the signal that is only a few Hz wide.
The first thing is to digitally band pass filter the signal and then
decimate down to a much lower sampling rate (say 1 kHz) and store only
this data, so we are really talking of storing a few kbytes/s.
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