कुल हार्मोनिक विरूपण कैलकुलेटर — सूत्र

## FFT Frequency Resolution

The FFT converts time-domain data into frequency-domain bins. The resolution depends on how long you observe the signal.

### Formulas

**Frequency Resolution = Sample Rate / FFT Size**

**Time Window = FFT Size / Sample Rate**

**Useful Bins = FFT Size / 2 + 1** (for real signals)

### Trade-off
Better frequency resolution requires longer observation windows. This is the time-frequency uncertainty principle.

- Larger FFT = finer frequency resolution but slower updates
- Smaller FFT = coarser resolution but faster updates