# Contributions:FIRFilter

## Contents

## Synopsis

A finite impulse response (FIR) filter for temporal filtering.

## Location

http://www.bci2000.org/svn/trunk/src/contrib/SignalProcessing/FIR

## Versioning

### Authors

Dennis McFarland, Juergen Mellinger

### Source Code Revisions

- Initial development: 31
- Tested under: 2203
- Known to compile under: 2203
- Broken since: --

## Parameters

### FIRIntegration

This parameter may be one of

- 0 - none
- no integration,
- 1 - mean
- mean value,
- 2 - rms
- root mean square,
- 3 - max
- maximum value.

For each sample of input, the FIRFilter computes the convolution of past samples with FIR filter coefficients.
When *FIRIntegration* is set to "none", this is also the filter's output.
When *FIRIntegration* is set to "mean", "rms", or "max", the respective computation is performed on the convolved signal, and its result returned in the output signal's first sample (element, bin).

### FIRCoefficients

A matrix of FIR filter coefficients. Here, rows correspond to channels, defining an individual FIR filter for each channel. When an empty matrix is specified, the FIRFilter returns its input signal unchanged.

## States

None.