Filter Design Toolbox

twiddles

Return the quantized twiddle factors for quantized FFTs

Syntax

• w = twiddles(F)
  

Description

w = twiddles(F) returns a vector of the quantized FFT coefficients specified by quantized FFT F. FFT coefficients are also called twiddle factors.

Examples

• f = qfft;
  w = twiddles(f)
  Warning: 4 overflows.
  w =
  
     1.0000          
     1.0000          
          0 - 1.0000i
     1.0000          
     0.7071 - 0.7071i
          0 - 1.0000i
    -0.7071 - 0.7071i
     1.0000          
     0.9239 - 0.3827i
     0.7071 - 0.7071i
     0.3827 - 0.9239i
          0 - 1.0000i
    -0.3827 - 0.9239i
    -0.7071 - 0.7071i
    -0.9239 - 0.3827i
  

See Also
qfft

tostring

unitquantize