Hello, I'm in the process of choosing a DSP for my next project. I am making a comparison between the FFT routines of SHARC (ADSP 21375) and the Blackfin (BF-518). The projects are attached.
I am doing simulations using the VISUAL DSP 5.0.
It generated a waveform of 60Hz (amplitude = 1) + 180Hz + 300Hz + 600Hz (amplitude = 0.1). The output of the FFT of the SHARC is perfect, but the output of Blackfin is totally different. I wonder why this difference?
Note: If I generate a simple waveform, 60 Hz (amplitude = 1) + 180Hz (amplitude = 0.1) the outputs of Blackfin and Sharc are identical.
Thank you for your attention.
Waveform Input (60Hz + 180Hz + 300HZ + 600Hz).
FFT Output Sharc.
FFT Output Blackfin.