Re: Complex to 2x real - how?

Randy Yates wrote:
> dotter <dotter@[EMAIL PROTECTED]
> writes:
>> [...]
>> Given the architecture of the device and various FPGA implmentations,
>> interpolation seems unlikely and more likely to be some cleverness
>> though I wonder if this is in the implementation space rather than
>> signal processing.
> 
> If you simply take the real component and stuff zeros in every
> other sample to upsample to 2*Fs, you've got what's advertised,
> although without the "inversion". That is, you'll have a real signal
> that has the original content from 0 to Fs / 2 preserved in 0 to Fs / 2
> of the new signal, and the original content from -Fs / 2 to 0 preserved
> in Fs / 2 to Fs. Since the new sample rate is 2 * Fs, Fs is the highest
> frequency at the output rate. 

Don't you have to filter after stuffing in order to suppress images?

Jerry
-- 
Engineering is the art of making what you want from things you can get.
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
** Posted from http://www.teranews.com
**