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Altera_Forum
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14 years ago

Understanding Polyphase Scaler Taps

Hi, I am trying to understand the significance and effect of the number of taps in the polyphase filter. What does increasing the number of taps do to the scaling result? What is the differenc...
Altera_Forum's avatar
Altera_Forum
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14 years ago

Hi Kieron,

I was using Scaler II from Quartus 10.1 and since Scaler II has no coefficient generation option, I used Scaler I just to generate the coefficients. I correlated these with the equation I found in the UDX4 example code (which was probably also based on Quartus 10.1 Scaler II operation). What you say makes sense - it is a pitty that none of this is properly documented / revealed by Altera. Some of this information could have saved me quite a number of hours of debugging. On the up-side, I understand the coefficient generation process much better now ;-)

I have yet to download version 11, and maybe now is a good time.

I was wondering, how does Altera generate these cores? Do they use the Matlab->HDL tools, or an existing HDL (Verilog/VHDL/SystemC) or some proprietary language?

Regards,

Niki