# saefilter

Filters a signal with an SAE filter.

## Syntax

y = saefilter(x,fs,class)

y = saefilter(x,fs,class,fftsize)

## Inputs

`x`- The signal to be filtered. If
`x`is a matrix each column is filtered. `fs`- The sampling frequency.
`class`- The SAE class of the filter (typically 60, 180, 600 or 1000).
`fftsize`- Size of the fft. (optional)

## Outputs

- y
- The filtered signal.

## Example

Filter a 200 Hz signal, sampled at 10,000 Hz, with a class 60 filter.

```
t = [0:0.0001:0.02-0.0001];
input = sin(2*pi*200*t);
plot(t,input);
hold on;
```

`output = saefilter(input, 10000, 60);
plot(t,output);
legend('input','output');`

## Comments

saefilter is based on SAE paper #810813, "Digital and Analog
Filters for Processing Impact Test Data." It uses a frequency domain filter that
attenuates 10dB/octave, beginning at 1.65*`class`.

`fs` should be at least 10 times `class`, and will
not be accepted if less than 3.3 times as large.

The signal can be zero-padded if desired using `fftsize`.