Signal overlap-add block plan calculator

Calculate minimum FFT length and power-of-two FFT length with your own figures.

Your numbers

Use the units shown. Results update as you change valid inputs.

Use minimum FFT length and power-of-two FFT length to compare changes to your inputs. The method and limits below explain the scope.

Examples

Examples

Try the starting example

Filter taps
65
Input block size
256
Input sample count
10000
Minimum FFT length
320
Power-of-two FFT length
512
Block count
40
Overlap samples
64

Try another scenario

Filter taps
66
Input block size
256
Input sample count
10000
Minimum FFT length
321
Power-of-two FFT length
512
Block count
40
Overlap samples
65
Calculation method

Calculation method

Minimum FFT length

Block size + filter length−1.

Power-of-two FFT length

Smallest power of two at least minimum length.

Block count

ceil(total input/block size).

Overlap samples

Filter length−1.

Symbols and units
a
Filter taps
b
Input block size
c
Input sample count

Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.

Assumptions & limits

Assumptions & limits

  • Filter length, block size, sample count. Returns FFT sizes, block count and overlap. All coefficients and observations are user supplied; results describe only the stated mathematical model. Quantities are deterministic calculations from supplied observations and assumptions; no external data is fetched. Supported limits: Finite inputs only; numeric fields bounded as labelled. Lists and JSON records are limited to 256 entries unless a stricter tool bound is stated. No automatic design approval, legal conclusion, treatment recommendation or safety certification. Filter taps: minimum 1, maximum 1000000. Input block size: minimum 1, maximum 1000000. Input sample count: minimum 1, maximum 100000000.
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Further reading

Method reference ↗

Background reading; this does not imply endorsement or independent review of SumFizz.

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