> For the complete documentation index, see [llms.txt](https://tlcfem.gitbook.io/suanpan-manual/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://tlcfem.gitbook.io/suanpan-manual/command-collection/process/upsampling.md).

# upsampling

Upsample a Given Seismogram

Minimum version: v2.6

## Syntax

```
upsampling (1) (2) [3] [4]
# (1) string, file path of the seismogram file
# (2) integer, upsampling rate
# [3] string, window type, default: 'Hamming'
# [4] integer, window length, default: 0
```

## Remarks

The seismogram ***must*** be stored in double column plain text file. The first column stores the time series, and the second column stores the acceleration amplitudes.

The time series ***must*** be equally spaced.

The window type can be one of the following:

* Hamming
* Hann
* Blackman
* BlackmanNuttall
* BlackmanHarris
* FlatTop

If the upsampling rate is denoted as $$L$$, the window length is $$nL+1$$. The parameter $$n$$ is controlled by the last parameter.


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