parameter
value
range
explanation
Architectural specification
n
32
64
128
256
512
1024
2048
4096
8192
16384
32768
65536
131072
262144
32–262144
logical size (the same with FFT size)
compression ratio
2
4
8
16
32
64
128
256
512
1024
2048
4096
8192
16384
2–16384
compression ratio, defined as logical memory size divided by physical memory size
interpolation order
Linear
Quadratic
Cubic
interpolation order: 1-linear, 2-quadratic, 3-cubic
data format
fixed-point
single-precision floating point
double-precision floating point
output data format: 1: fixed-point, 2:single-precision floating point, 3:double-precision floating point
twiddle width
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
2–32
bitwidth
error bits
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
0 –30
error bits
function
sin
cos
interpolation function: sin or cos