# impz: Impulse-response characteristics In signal: Signal Processing

## Description

Impulse-response characteristics of a discrete filter.

## Usage

 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 ## Default S3 method: impz(filt, a = 1, n = NULL, Fs = 1, ...) ## S3 method for class 'Arma' impz(filt, ...) ## S3 method for class 'Ma' impz(filt, ...) ## S3 method for class 'impz' plot(x, xlab = "Time, msec", ylab = "", type = "l", main = "Impulse response", ...) ## S3 method for class 'impz' print(x, xlab = "Time, msec", ylab = "", type = "l", main = "Impulse response", ...)

## Arguments

 filt for the default case, the moving-average coefficients of an ARMA model or filter. Generically, filt specifies an arbitrary model or filter operation. a the autoregressive (recursive) coefficients of an ARMA filter. n number of points at which to evaluate the frequency response. Fs sampling frequency in Hz. If not specified, the frequencies are in per unit. ... for methods of impz, arguments are passed to the default method. For plot.impz, additional arguments are passed through to plot. x object to be plotted. xlab,ylab,main axis labels anmd main title with sensible defaults. type as in plot, uses lines to connect the points

## Details

When results of impz are printed, the impulse response will be plotted. As with lattice plots, automatic printing does not work inside loops and function calls, so explicit calls to print or plot are needed there.

## Value

For impz, a list of class impz with items:

 x impulse response signal. t time.

## Author(s)

Original Octave version by Kurt Hornik and John W. Eaton. Conversion to R by Tom Short.

## References

Octave Forge https://octave.sourceforge.io/

## Examples

 1 2 3 bt <- butter(5, 0.3) impz(bt) impz(ellip(5, 0.5, 30, 0.3))

### Example output

Attaching package: 'signal'

The following objects are masked from 'package:stats':

filter, poly

signal documentation built on May 25, 2021, 9:06 a.m.