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Date Posted: 10:33:36 02/12/02 Tue
Author: Jain
Subject: Re: AGC sampling added to Rev7t1d2
In reply to: Potter 's message, "Re: AGC sampling added to Rev7t1d2" on 06:50:11 01/31/02 Thu

Hey Potter
You are talking here about DigitalMan DC restoration; I'm interested to see that circuit and I have no ideea where it is. Could you let me know if it's available somewhere for studying it (and maybe using the idea, or at least addapting it)?
Jain

>I chose a line that is always black on all channels
>(16 for me) and sampled from the end of the burst to
>near the end of the line (~50uSecs). This is the line
>after the one carrying the data packet. I'm also
>considering the DigitalMan DC restoration as this
>could be driven by the same sampling pulse and
>eliminate the clamping level adjustment for even
>better all-round results.
>
>>Folks,
>>
>>I did a very quick hack to my Rev7t1d2 code for SA and
>>added AGC sampling support for Potter's circuit. It
>>uses RA3 (audio privacy on Canton 4.2, available on
>>the 3 pin header), and samples for about 800 nSec.
>>during line 23. I haven't properly timed it to the
>>front porch or anything like that, I just threw it in.
>> 800 nSec. may not be long enough, and since I haven't
>>built Potter's circuit to test it may not work at all,
>>but let me know how it goes and I'll fix it when I
>>have some time.
>>
>>I sent the code to Jain and Sakman, I don't have
>>Potter's email address. Once it's working the way we
>>want it to, I'll zip it up like the Rev7t1d2 code and
>>Tom can post it if he likes.
>>
>>- Phil

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