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To: fyodor_ who wrote (22808)	12/18/2000 12:21:15 PM
From: Paul Ma	Read Replies (1) \| Respond to of 275872

wow nvidia up 2 3dfx down 90%, should have shorted it a long time ago!!!!!!!!!!!!!!!! Paul

To: fyodor_ who wrote (22808)	12/18/2000 12:45:15 PM
From: pgerassi	Read Replies (1) \| Respond to of 275872

Dear Fyodor: Check with your references about NTSC resolution. It is an analog system. Bandwidth for a single televison signal is about 6MHz. The horizontal frequency is 15,750Hz or 525 lines per frame and 30 frames per sec. 6MHz/15,750 is about 381 Hz per line. Taking a minimum of 2 samples per line and a 20% horizontal flyback yields about 640 displayed samples per line. Since 1 line is usually lost for interlace syncs and 44 lines for vertical and closed captioning, the resulting displayed image is 640x480. Interlace simply means that odd lines are draw first and then even lines so as to fool the eye into seeing smoother motion than progressive scan refresh rate of 30 frames per second would result. Most modern TVs actually have higher resolution horizontally than this because of the adoption of SVHS connections. But, they do a lousy job with interlacing by simply drawing each set on top of one another. Better sets do it correctly and premium sets (EDTV types) have a frame buffer so that they progressive scan at VGA speeds but only half the frame updates per refresh (60Hz). My Pioneer Laser Disc Player has this feature and the resulting picture is much sharper. To prove it, just go into any TV Broadcast center and look at the picture using their test and/or monitors. These do it correctly and the picture is very good. 320x240 is used by MPEG-1 video streams (from Video CD-ROMs) as the standard resolution but are generally referred to as a quarter CCIR (display only 1/4th of a video frame). The fact that your TV set (or distribution system) can not display 640x480 does not mean that a high quality system can't. Some cable operators try to shrink the channel bandwidth to 3MHz to pack more channels onto a cable. Also some low quality digital distributors use MPEG-1 as the standard. Thus you get an apparent 320x240 but, this is not what a TV station like (WTMJ-4, WISN-12, WVTV-18, and WMTV-10) delivers. I helped computerize WTMJ's Engineering Division. I have seen the quality of what they broadcast and what a top quality SONY Broadcast Fine Line Monitor shows about the reception. It is no where near 320x240 and is more like 720x480 (they do not use a square pixel (more like (8:9 (HxV))). WMTV is also broadcasting HDTV to the area. Pete