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Discussion Groups

Discussion Groups | TMS320C6x | FFT function

Technical discussions about the TI C6000 DSPs (including the c62x, c64x and c67x DSPs).

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FFT function - Author Unknown - Mar 12 12:55:00 2001

Does anyone know where can I purchase a DSP library which has the function "autoscaling radix 4 FFT"?? Most of the site has only radix 4 FFT without autoscaling, so does anyone know? Please help as this is urgent!!!! I am using a fixed point DSP chip therefore I will need a FFT function with autoscaling to overcome the problem of bit overflow.

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FFT function - Author Unknown - Mar 31 9:39:00 2001

I am using a Fixed point FFT function provided by TI on a C6201 dsp chip. I would like to know what value should the input and output data be aligned to? What should the twiddle factor be aligned to? input and output are 32bit value. Can someone also explain to me abt the alignment. If i align the data incorrectly, does that mean that i will get the wrong result. Problem: My program consist of a for loop. THe for loop will consist of the FFT function. When I run my program the first loop, it give me a correct output from the FFT function. without restarting the program, for the second loop it give me an incorrect output!! I have check the input for every loop before the FFT function and it is the correct input, but why is it that i only get the correct output for my first loop?