# fftWindow

Spectrogram (): the analysis window — `hann`, `hamming`, `blackman`, `rect`.

Canonical: https://chart.syidax.com/docs/options/fftWindow/

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## Definition

| Item | Value |
| --- | --- |
| JavaScript property | `fftWindow` |
| HTML attribute | `fft-window` |
| Type | `SpectrogramWindowKind` |
| Default | `undefined` |
| Allowed values | `rect`, `hann`, `hamming`, `blackman` |

undefined means this property was not explicitly set. The effective value may depend on the chart type and other settings.

- [SpectrogramWindowKind](https://chart.syidax.com/docs/types/SpectrogramWindowKind.md) — Type definition

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## Related documentation

A property with the same name may have different types and defaults across charts. When using a direct tag, follow that chart's documentation below.

- [Shared facade and direct tags](https://chart.syidax.com/docs/concepts.md)
- [sy-spectrogram](https://chart.syidax.com/docs/components/spectrogram.md#property-fftWindow)