FIR Digital Filter Design Applet

(Java 1.1 Version)

Note

This is a Java 1.1 applet. It should work with HotJava 1.1, Internet Explorer 4.0 or Netscape Navigator 4.0 with the Java 1.1 upgrade patch applied.

Outline instructions

Choose appropriate values for the following settings.

• Filter type: low pass (LP), band pass (BP) or high pass (HP)
• Window type: Rectangular, Hanning, Hamming or Blackman
• Filter order: must be an even number > 0
• Filter passband: based on sampling rate of 8000 samples/s (maximum signal frequency 4000 Hz)

Click the Design button to design the filter, then click Frequency response to display the gain frequency response plot for the filter. Click the Coefficients button to list the filter coefficients. The coefficients are normalised to make the maximum filter gain equal to 1. If you wish, you can copy and paste the coefficient list to a text editor; this will enable you to save the coefficients to disc. (A Java applet isn't allowed to write to your local drive).

Fuller explanatory notes are also available.

You need a Java-compatible browser to use this applet.

If all you can see is a grey rectangle, try the Java 1.02 version of the applet.

Download source code (zip Archive)

Kaiser window filter design applet | IIR filter design applet

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