https://github.com/kranfix/maf

Moving Avergare Filter in VHDL for DE0-NANO with FPGA Cyclone IV
https://github.com/kranfix/maf

Last synced: 4 months ago
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Moving Avergare Filter in VHDL for DE0-NANO with FPGA Cyclone IV

• Host: GitHub
• URL: https://github.com/kranfix/maf
• Owner: kranfix
• Created: 2013-05-17T17:34:50.000Z (about 13 years ago)
• Default Branch: master
• Last Pushed: 2013-07-02T23:05:48.000Z (almost 13 years ago)
• Last Synced: 2025-10-22T13:50:02.084Z (8 months ago)
• Language: VHDL
• Size: 148 KB
• Stars: 1
• Watchers: 1
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

          
MAF

===

Moving Avergare Filter (MAF) in VHDL 2008 for DE0-NANO with FPGA Cyclone IV.

This filter works with fixed point that the number of bits depends on the ADC.

About the Moving Average Filter

===============================

A Moving Average Filter is a digital filter that average of the input's last

M + 1 terms such as the following expresion:

            x[n] + x[n-1] + .... + x[n-M]

    y[n] =  -----------------------------

                        M + 1

Using the second direct-form we can define h[n] like this:

    h[n] = x[n] + h[n-1]

So y[n] can be expresed in this waw:

    y[n] = (h[n] - h[n-M]) / (M + 1)

Structure of the filter

=======================

The Top Hierarchy is maftop.vhd that define all the filter's structure.

delayer.vhd

-----------

To generate from h[n-1] to h[n-M], flip-flops are used to delays.