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ppppenguin · 7th Dec 2010, 10:35 am

When you do binary arithmetic you will always accumulate extra bits. As you said, if you add a pair of 8 bit numbers you get a 9 bit result. If you multiply two 8 bit numbers you get a 16 bit result. You have to decide what to do with these excess digits. For example in my colour black design some of the processing is done with 12 bits. Then I simply truncate the 2 LSB before the DAC. There are also various rounding methods.

Please give Jérôme my best wishes.

7th Dec 2010, 10:35 am	#10
ppppenguin Retired Dormant Member Join Date: Dec 2003 Location: North London, UK. Posts: 6,168	Re: 819 line standards convertor. When you do binary arithmetic you will always accumulate extra bits. As you said, if you add a pair of 8 bit numbers you get a 9 bit result. If you multiply two 8 bit numbers you get a 16 bit result. You have to decide what to do with these excess digits. For example in my colour black design some of the processing is done with 12 bits. Then I simply truncate the 2 LSB before the DAC. There are also various rounding methods. Please give Jérôme my best wishes.