Re: V-Box

From: Richard Atkinson (
Date: 2000-09-01 13:31:17

On Fri, 1 Sep 2000, Ojala Pasi 'Albert' wrote:

> The Enhanced Video Input Processor (EVIP) is a combination of a two-channel
> analog preprocessing circuit including source selection, anti-aliasing filter
> and ADC, an automatic clamp and gain control, a Clock Generation Circuit
> (CGC), a digital multi-standard decoder (PAL BGHI, PAL, MPAL N, NTSC M,
> NTSC-Japan, NTSC N, and SECAM), a brightness/contrast/saturation control
> circuit, a colour space matrix (see Fig.1) and a 27 MHz VBI-data bypass.

Interesting. I wonder if it does PAL, NTSC and SECAM *properly* .....

I recently obtained an NTSC-compatible TV for my multitude of NTSC
hardware. It displays PAL correctly, but it displays NTSC by converting it
to PAL and then running it through the usual PAL delay line matrix. This
looks okay on television images but for computer work it's just not proper
NTSC. For example, mixed colours used in games such as Mayhem in
Monsterland come out properly mixed, whereas a real NTSC display would
show them as alternating lines of different colour. It also displays SECAM
by converting it to PAL, which is truely *horrible* as you get both SECAM
and PAL 1 line artifacts, and when you consider that the SECAM C64 works
by converting PAL to SECAM, the net result of my SECAM machine on this TV
is that colour encoding artifacts bleed 2 lines into the image below.

I need some proper multistandard devices...


Richard Atkinson
Software Engineer
Tenison Technology EDA Ltd

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