different type of FFTs ; Is input same??

[shan14]

different type of FFTs ; Is output same??

Hi
I have few questions
1) does output of radix 2 and radix 4 FFT are same if inputs are same??

2) does output of radix 2 and radix 4 FFT are same if one FFT is floating point and other is fixed point??

3) also twiddle factors are different of both FFTs hence output can not be same, Is it right??

 

[MagicianT]

Re: different type of FFTs ; Is output same??

Hi
I have few questions
1) does output of radix 2 and radix 4 FFT are same if inputs are same??

2) does output of radix 2 and radix 4 FFT are same if one FFT is floating point and other is fixed point??

3) also twiddle factors are different of both FFTs hence output can not be same, Is it right??

1). Yes.
2). Depends how you interpret "the same", is "float X" and "int32_t X" the same?
3).Twiddle factors are sine and cosine functions, they are always the same, but radix-2 needs 45 and 135 degrees and radix-4 doesn't.