## Re: DFT/FFT

This is a snippet form an FFT routine. The author uses a linked list object rather than an array to hold the real and imaginary data. The x.next statement simply...

## Re: DFT/FFT

Yes. Thanks. It is all helpful. I just have wrap my head around it.

## Re: DFT/FFT

Thanks for this.I though it was going as simple as a just multiplying the input data with a complex pair and doing the shift in one great swoop. I need to be conscious...

Great. Thanks

## Re: DFT/FFT

Is necessary to filter the mixed data before the FFT?Also is there a read on the net about this you can point me to?

## Re: DFT/FFT

I was wondering about this. I do understand this in the analog domain.One would have have to know the frequency offset of the input signal.What if it's an unknown....

## Re: DFT/FFT

Thanks.I somewhat of a novice with these maths. I'll try to make some sense out of what you said. I'm not sure what you mean by the "input spectrum" or mixing it...

## DFT/FFT

The DFT below can be tuned with an offset to the bins.This is done at this line, double a = (j+0.5) * sf; where sf is, double sf = 2.0 * Math.PI / n;j is the bin...

## Re: Frequency multiplication in the digital domain

I not sure sure I follow the purpose. How does this generate sample timing?

## Re: Frequency multiplication in the digital domain

Yes it is a pure low noise sine waveform. The input frequency is variable between the said frequencies but I think it might be impractical to cover such a wide band.The...

## Frequency multiplication in the digital domain

I need some DSP advice on how to. I have an input sine waveform that varies in the range from 10Hz to 100kHz. I need to multiply the frequency of the input sine...

Use this form to contact dbarber

Before you can contact a member of the *Related Sites:

• You must be logged in (register here)
• You must confirm you email address