Hallo > > > What you are likely seeing there is the limits of the accuracy of > > > the ADC of whatever encoded the video. I.e., ADC noise, which > > > will > > > > Not really - unless Canopus' quality took a huge drop. Note the > > rather huge percentages - it's not just a little ripple, but is > > several percent. > Do you have any hard and fast documentation on the resolution / error > rate / tolerance on the Canopus ADC converter? Otherwise, for a > consumer / pro-sumer level device, a couple percent error rate I'd > think wouldn't be seen as too big an error rate. Standard discrete > analog (resistors/etc.) electronic component tolerances are 20% > (roughly analogous to "error rate") unless you go out of your way to > order the tighter tolerance items (10% and 5%, and at correspondingly > higher prices). Not for the Canopus. But for the Zoran based cards there is it aviable. To know what you can epxect from the card's just take a look at the datasheets. For the SAA7111A (used in the BUZ) Philips says that the ADC, have DC integral linearity error of 1LSB, differential gain (amplifier plus anti-alias filter = bypass) 2% typical. And that IC was desigend in 1997. For the input the DC30 I have just loked has only a 75Ohm Singal termination resistor and a 2u2Henry inductor and at least one cpacitor. So that's not that much stuff. But it is likely that I missed connections on the 4 layer board.
What I fear much more that cheap components are bad quality cables. They can cause more problems. People which use a audio cable for transmitting videos signals should not wonder why the video lookes different. Often these cheap cables are the one that come with the devices. BTW: Resistors get really expensive when they have 0,01% and a TC (Temperatur cofefficient) lower than 1ppm/°C, and 50ppm/year, and a thermal e.m.f <1uVC. That kind of resistors hurt when you need to buy them. For one of them you get 1000 of the 1% resistors (and a TS of 100ppm/°C). auf hoffentlich bald, Berni the Chaos of Woodquarter Email: [EMAIL PROTECTED] www: http://www.lysator.liu.se/~gz/bernhard ------------------------------------------------------- This SF.net email is sponsored by: 2005 Windows Mobile Application Contest Submit applications for Windows Mobile(tm)-based Pocket PCs or Smartphones for the chance to win $25,000 and application distribution. Enter today at http://ads.osdn.com/?ad_idh82&alloc_id148&op=click _______________________________________________ Mjpeg-users mailing list Mjpeg-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mjpeg-users
