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Altera_Forum's avatar
Altera_Forum
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14 years ago

NCO help...

Hi i'm trying to test a fixed point filter on a FPGA board, my filter has an input of 16 bit, but the maximum value it can take without saturation is 1023 which is 11 bits. so far the only signal i'v...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

When Fo = -3 your bus does not show negative value, instead it shows 2045

as if its sign bit is 0 instead of 1 thus your wiring doesn't look right.

For interpolation/decimation you implement the rate conversion through filters.

Ofcourse you need to convert the rates but you have to explain what do you mean by rate transitions.