I try to make an analyzer of frequency with a DSP (blackfin 533).
Frequency band: 50Hz in 5000Hz.
I try to make a program which calculates the FFT of any signal in this frequency band. As first test, I use a sinusoidal signal generated by a waveform generator, this signal is sent to a CAN to sample it to be able to calculate this FFT.
What I shall want to know, it is : which frequency of sampling do I have to use?
It is what counts it of point which it is necessary to use, of such way of having a FFT of a step of 1.
That is be able to calculate a FFT for every frequency: 50, 51,52 .. 5000Hz.
Software: VisualDSP ++ 5
DSP: ADSP BF 533 EZ-KIT LITE
ADC: AD7980 (can have a frequency of maxi sampling of 1MHz)