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THE FEUTEX TOOLKIT

Coherent FFT Tone Plan

Choose the nearest integer-bin tone and report detuning from a target.

Signal Processing workspace● Runs in your browser
01 Your input
02 Your result
View or copy raw result data
Formulak=round(ftarget N/fs); ftone=kfs/N
Sources and model references

Worked example

Inputs

Sample rate
48000 Hz
Record length
1024 samples
Desired tone
1000 Hz

Expected results

Nearest positive bin
21 bin
Coherent tone
984.375 Hz
Tone detuning
-15.625 Hz

Load the example in the workspace to reproduce these results. Display rounding does not change the underlying calculation.

How to use this tool

  1. Enter the labeled inputs in the indicated units.
  2. Calculate and compare every output against the stated model assumptions.

Try this example

{
  "fs": 48000,
  "n": 1024,
  "target": 1000
}

Accuracy and scope

Integer cycles avoid truncation leakage; this does not require a coprime bin and record length. Simplified analytical model; not a design recommendation or safety certification.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.