"Jerry Avins" <jya@ieee.org> wrote in message
news:b3s2m.2448$066.1548@newsfe08.iad...
> BobW wrote:
>> "Jerry Avins" <jya@ieee.org> wrote in message
>> news:bfq2m.2441$066.810@newsfe08.iad...
>>> BobW wrote:
>>>
>>> ...
>>>
>>>> I found the answer. It was in the last place I looked.
>>> Almost inevitably. Having found it, why look further?
>>>
>>> ...
>>>
>>> Jerry
>>
>> Yes. I was merely trying to add a little bit of humor to this
>> otherwise-dry newsgroup.
>
> It alternates. Sometimes the humor gets laid on thick. (When I attempt it,
> it often falls flat.)
>
>> I sense that this technique of packing real data samples into the
>> imaginary part of the input to the FFT is rather uncommon. Is that your
>> take, too?
>
> No. The technique seems to be widely known, but rarely needed. There are
> real-to real FFT libraries available that do the scut work for the user,
> as good libraries should.
>
> Jerry

I certainly have found many real-to-real FFT routines, but the one that's
available for my microcontroller merely stuffs zeros into the imaginary data
input locations and then returns the magnitude of the outputs.

This particular technique, described by Mr. Lyons, puts the real data input
samples into the imaginary inputs (rather than just setting them all to
zero). The advantage is that the input data buffer size can be cut in half
(for a particular input data set).

Is it your experience that the "Lyons" technique is commonly used?

Bob
--
== All google group posts are automatically deleted due to spam ==