[opendtv] Re: PAL
- From: "Allen Le Roy Limberg" <allimberg@xxxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Fri, 15 Dec 2006 14:15:57 -0500
Harwood's circuitry and its like made VIR superfluous.
Al limberg
----- Original Message -----
From: "John Shutt" <shuttj@xxxxxxxxx>
To: <opendtv@xxxxxxxxxxxxx>
Sent: Friday, December 15, 2006 10:36 AM
Subject: [opendtv] Re: PAL
> I thought the NTSC cure to green people was VIRS. Gee, whatever happened
to
> all those television sets out there using VIRS? The FCC mandated that if
we
> transmit anything on line 19 of NTSC, it had to be the GCR signal. This
> displaced the voluntary VIRS that many professional Proc Amps and at least
> one consumer television set, RCA, used to automatically set chroma phase
and
> amplitude. VIRS got moved to differing lines, and most professional
> equipment using VIRS could be reprogrammed to find it, but those consumer
TV
> sets were out of luck.
>
> I guess right about the time that the technology got cheap enough to
enable
> something like VIRS, the rest of the technology got stable enough to not
> require it anymore. Not that GCR was a roaring success, either.
>
> John
>
> ----- Original Message -----
> From: "Allen Le Roy Limberg" <allimberg@xxxxxxxxxxxx>
>
>
> > Bert's view is pretty much correct. In the 70's Leopold Harwood
developed
> > circuitry that adjusted flesh tones automatically for NTSC receivers.
He
> > was working in the group developing integrated-circuit TV and FM radio
> > circuitry at RCA's Somerville, NJ facility. Jack Avins (inventor of the
> > dual-triode VTVM and a host of FM detectors) headed up the group, which
> > the
> > Japanese called the Magnificent Seven. The group was the first to put
> > whole
> > subsystems into integrated circuit chips. The count-down FM stereo
> > decoder
> > was the first IC larger than 10,000 square mils and comprised some 200
> > bipolar transistors.
>
>
>
>
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