Re: Fixed point number hardware implementation

Hi there,

I already have the fixed point values for the integers and as they're just
5 coefficients, I have just taken them as constants. Do you think it is
alright? Well, then I am giving input(16-bit {1 sign bit and 15 fractional
bits}) from the switches and buttons on the Spartan-3 board. As there are
just 4 1-bit push buttons and an 8-bit switch (12-bits altogether, and then
I am keeping 4 bits constant). Then the output is also 16-bit which
includes 1 sign bit, 4 integer bits and 11 fractional bits. Now, I have
used the 7-segment display to show the output in such a way that the
leftmost digit is showing the hex value of 4 integer bits, and then a dot
to show decimal point and then the next 3 digits for fractional part but
as there are 11-bits in fractional part, so, I have padded a zero at the
end of fractional part just to make it a 4-bit value for the hex-decoder.
And then I am using the last dp (dot/decimal point on 7-seg display to
indicate the sign of the number).

So, I am only giving input from the board and getting the output and not
using any RAM/ROM or multiplier blocks, I have only used constants and the
operators ('+', '-', '*') and left it all to the VHDL to do all the
intermediate arithmetic and use the hardware components as required, will
it be fine?

Do you think it is a good design?

Now, I was wondering what will be the best option if I wanted to
demonstrate the filter operation more clearly. I mean these are just
numbers that I am showing on the 7-seg display. But if I want to give a
sinusoidal input and get a filtered waveform at the output.

1)I have got the code for vhdl sine generator.
2)Showing the ouput on the oscilloscope? it sounds a bit tedious.
3)Do you think interfacing a microphone and speaker would work for this
design (and for Spartan-3)?
4)Or giving the output back to the simulator and showing the waveform
would do?
5)or any other application/test case you would suggest for IIR filter
implementation on FPGA?
Thanks very much for your help.

Regards,

Kami
.

Relevant Pages

  • Re: Fixed point number hardware implementation
    ... demonstrate the filter operation more clearly. ... numbers that I am showing on the 7-seg display. ... It wouldn't take much to drive a VGA display. ...
    (comp.arch.fpga)
  • Re: Blank rows
    ... I use the method all the time, where I can have a reporting sheet with ... Next month I re-apply the filter. ... blank rows so I only have those with data in showing? ...
    (microsoft.public.excel)
  • Re: inserting Adobe Illustrator graphics, more experience
    ... Word's "picture editing" tools, they can work only with bitmaps. ... The 'shapes' group are all very similar to CGM (Computer Graphics Metafile) ... as a group, it can have a name, a hyperlink, display ... the import filter, which says "Is this something like CGM?" ...
    (microsoft.public.mac.office.word)
  • RE: Developing Form For Sales Analysis
    ... understand how anyone would have any questions, or misunderstand your intent, ... > showing what we're hoping to accomplish to anyone who may be interested). ... > are wanting each page to display one image. ... The total number of the transfer sold, by quantity, for year up to date. ...
    (microsoft.public.access.forms)
  • Re: Drag from SP2 window to desktop?
    ... > display the same help text as originally displayed by the javascript ... Embedded within the HTML will be lines like this: ... > The idea is that if the user wants to perform a "filter" operation on one ... they can drag and drop the filter icon (which is surrounded ...
    (microsoft.public.windows.inetexplorer.ie6.browser)