What is Progressive Scan?

[Ultra Nexus]

<font color='#000000'>Hey there! I`ve been looking for some tech info about DVD players and found out some main diferences between some like the Progressive Scan and 27/54Mhz features.

Does anyone knows where can I find this info so I can compare the pros and cons?

Thanks for any input!

UNex.</font>

[Rob Babcock]

<font color='#000000'>Progressive scan basically means 'deinterlacing.&quot; *The picture used by the NTSC standare (ie. regular TV) is 'interlaced', meaning every odd line is drawn, followed by every even. *The fact that the picture looks like a continuous one is due to the phenomenon called persistance of vision. *During scenes with a lot of motion the technique of interlacing introduces artifacts that detract from the picture quality (eg, jaggies, moire, stairstepping, etc.)


Prog scan basically compensates for this by deinterlacing the image and drawing the whole picture all at once. *This creates a much more stable image, especially where motion is concerned.

That's the best definition I can muster; I'm not an engineer, just a regular guy!</font>

[Ultra Nexus]

<font color='#000000'>It will do! Thanks!</font>

[PaulF]

<font color='#000000'>54Mhz uses 2x oversampling of the video signal. This will interpolate some values of the digital stream so that the filter design can be relaxed in the DAC. Generally it results in better performance.</font>