[opendtv] Re: PAL
- From: "Allen Le Roy Limberg" <allimberg@xxxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Fri, 15 Dec 2006 09:59:49 -0500
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.
Leo was a great engineer with over a hundred patents, many for really
ingenious inventions. Perhaps his best known one was base ballasting for
transistors, which made power transistors possible. Leo was one of the
first to exploit the close matching of components that IC made possible.
Leo was actually the first to use current mirrors, though the credit is
popularly given to Widlar at National Semiconductor. Leo used a self-biased
transistor to replace the diode in an earlier circuit of a gentleman at
Sarnoff Labs whose name escapes me at this moment.
Al Limberg
----- Original Message -----
From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
To: <opendtv@xxxxxxxxxxxxx>
Sent: Thursday, December 14, 2006 4:35 PM
Subject: [opendtv] Re: PAL
> Al Limberg wrote:
>
> > The problem PAL was designed to overcome was the problems
> > with piping composite video over telephone lines.
>
> Maybe we're talking about the same thing, but I thought it was meant to
> solve the problem of colors shifting in receivers as a result of phase
> distortion in transmission? The striking difference between PAL and
> NTSC, to me, was always the much more natural colors, especially flesh
> tones, in PAL. I remember that over here, you had to readjust the color
> for every station, just about, in the late '60s. Whereas with PAL, there
> was no adjustment at all. No knob.
>
> Bert
>
>
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