Recommend LUT generator
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Recommend LUT generator

 
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Robert Martin
Guest
Posted: Tue Jan 04, 2005 3:37 pm    Post subject: Recommend LUT generator Reply with quote
Can anyone please recommend the best lookup table generator usable in
Windows 98 for sinewaves of varying amplitudes?

Thank you,

Robert
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Unbeliever
Guest
Posted: Tue Jan 04, 2005 3:49 pm    Post subject: Re: Recommend LUT generator Reply with quote
"Robert Martin" <rmartin@complink.com> wrote in message
news:mbskt0do70o6nhqr1dm5ntuj60g446blmu@4ax.com...
Quote:
Can anyone please recommend the best lookup table generator usable in
Windows 98 for sinewaves of varying amplitudes?

Thank you,

Robert

Excel's not bad.
Cheers,
Alf
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Meindert Sprang
Guest
Posted: Tue Jan 04, 2005 3:53 pm    Post subject: Re: Recommend LUT generator Reply with quote
"Robert Martin" <rmartin@complink.com> wrote in message
news:mbskt0do70o6nhqr1dm5ntuj60g446blmu@4ax.com...
Quote:
Can anyone please recommend the best lookup table generator usable in
Windows 98 for sinewaves of varying amplitudes?

Ehhr, Excel?

Meindert
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Hans-Bernhard Broeker
Guest
Posted: Tue Jan 04, 2005 3:53 pm    Post subject: Re: Recommend LUT generator Reply with quote
Robert Martin <rmartin@complink.com> wrote:
Quote:
Can anyone please recommend the best lookup table generator usable in
Windows 98 for sinewaves of varying amplitudes?

Why on earth would you need more than one look-up table for sinewaves?

It's almost guaranteed to be easier to just multiply the amplitude
into a single, unit amplitude sine wave table look-up result, than to
waste lots of memory to have a full look-up table per amplitude.

As to what the "best" generator for such tables might be, that's
impossible to answer without knowing what what "good" means to you, in
this context. I'ld use gnuplot and Unix'ish textutils to do this.

--
Hans-Bernhard Broeker (broeker@physik.rwth-aachen.de)
Even if all the snow were burnt, ashes would remain.
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moocowmoo
Guest
Posted: Tue Jan 04, 2005 3:59 pm    Post subject: Re: Recommend LUT generator Reply with quote
"Robert Martin" <rmartin@complink.com> wrote in message
news:mbskt0do70o6nhqr1dm5ntuj60g446blmu@4ax.com...
Quote:
Can anyone please recommend the best lookup table generator usable in
Windows 98 for sinewaves of varying amplitudes?

Thank you,

Robert
You need to define "best". I use Goldwave.

Peter


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Andrew Reilly
Guest
Posted: Tue Jan 04, 2005 5:11 pm    Post subject: Re: Recommend LUT generator Reply with quote
On Tue, 04 Jan 2005 22:37:23 +1100, Robert Martin wrote:

Quote:
Can anyone please recommend the best lookup table generator usable in
Windows 98 for sinewaves of varying amplitudes?

I use python for that sort of thing. Works under Windows too.

--
Andrew
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Spehro Pefhany
Guest
Posted: Tue Jan 04, 2005 6:25 pm    Post subject: Re: Recommend LUT generator Reply with quote
On Tue, 04 Jan 2005 21:37:23 +1100, the renowned Robert Martin
<rmartin@complink.com> wrote:

Quote:
Can anyone please recommend the best lookup table generator usable in
Windows 98 for sinewaves of varying amplitudes?

Thank you,

Robert

I use C.


Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
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Steve Taylor
Guest
Posted: Tue Jan 04, 2005 9:55 pm    Post subject: Re: Recommend LUT generator Reply with quote
Robert Martin wrote:

Quote:
Can anyone please recommend the best lookup table generator usable in
Windows 98 for sinewaves of varying amplitudes?

Thank you,

Robert
MathCad. Keeps the maths human readable too.


Steve
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Bob
Guest
Posted: Tue Jan 04, 2005 11:21 pm    Post subject: Re: Recommend LUT generator Reply with quote
Quote:
Can anyone please recommend the best lookup table generator usable in
Windows 98 for sinewaves of varying amplitudes?

Thank you,

Robert

I use C.


Best regards,
Spehro Pefhany

Use the same language that you use on the target (C, for me). Then, test the
LUT client code (are we interpolating correctly between lookup values? are
we handling all the exceptional cases correctly?) on your desktop machine.
Exhaustive testing is usually much easier (read: more likely to be done) on
the desktop than on your target. Desktop testing also identifies good test
values to put through the target code - do that too. E.g. I did a 3rd order
by 4 element LUT (35 "bytes" of table values total including the addwf PCL
instructions) implementation of antilog on a PIC last year. I would probably
still be working on it if I hadn't determined the table length-by-width
requirements on excel and prototyped the code on the desktop.

Bob
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