[opendtv] Re: Video compression artifacts and MPEG noise reduction

Sounded good until you reached the wrong conclusion.

Bob Miller

On Mon, Jun 16, 2008 at 2:15 PM, Manfredi, Albert E
<albert.e.manfredi@xxxxxxxxxx> wrote:
> Kon Wilms wrote:
>
>> Let's also abandon cars and bring back the horse and
>> buggy while we're at it.
>
> Wrong analogy, but there actually is a very close car-related analogy.
>
> In the mid 1970s, Michelin introduced a tire with ellyptical
> cross-section, called the TRX. The goal was to create high pressure, low
> aspect ratio tires, without introducing too much ride harshness. This
> was to provide better directional stability and fuel economy. Stresses
> were supposed to be better distributed throughout the sidewall.
>
> Because the cross section was ellyptical, standard wheel rims could not
> be used. The surfcaes of the rim that mate to the tire were not
> parallel, as they are in normal wheels. So while they were at it,
> Michelin introduced a wheel rim with metric dimensions. TRX tires were
> specified all-metric. Such as, 220/55-390.
>
> Great. So in order to benefit from this innovation, everyone would have
> to change tires AND rims.
>
> Instead what happened was that other tire companies managed to change
> their sidewall designs in such a way as to offer high pressure, very low
> aspect ratios (soon even less than the 65 and 55 ratios of TRX tires),
> without having to use a different standard of rim design.
>
> If you can get away with it, it's usually better to extend the existing
> standard. If you can do it, it's far easier to tweak MPEG-2 than to
> introduce a new codec, for existing, deployed broadcast applications.
>
> Bert
>
>
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