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Keysight Technologies
U8903A Audio Analyzer
Creating a Custom Filter for the
U8903A Audio Analyzer




Demo Guide
Table of Contents
Demonstration Objectives 2

Step 1: Matlab fdatool
(filter design and analysis tool) 3

Step 2: Create Filter 4

Step 3: Export Filter
Coefficient 7

Step 4: Settling Time (Delay) 9

Step 5: Transfer to .juf file 11

Step 6: Upload .juf file to
U8903A Audio Analyzer 13

Conclusion 14

Ordering Information and
15
Related Literature




Demonstration objectives
This demonstration will teach you how to create your own custom filter for the Keysight Technologies, Inc.
U8903A Audio Analyzer by using the MATLAB software on your computer.

Steps to create a custom filter
Follow the steps below to create your own custom filter for the U8903A.


Steps
1. Matlab fdatool (filter design and analysis tool)
2. Create Filter
3. Export Filter Coefficient
4. Settling Time (Delay)
5. Transfer to .juf file
6. Upload .juf file to U8903A Audio Analyzer




2
Step 1

Matlab fdatool (Filter Design and Analysis Tool)

Instructions
1. Start MATLAB program (Figure 1)
2. In the command window, type "fdatool" to start Filter Design and Analysis Tool in MATLAB (Figure 2)




Figure 1. MATLAB command window




Figure 2. Filter Design and Analysis Tool

3
Step 2

Create filter
Instructions
1. Click on "Set quantization parameter" (Figure 3)
2. Select "Single-precision floating-point" because the architecture of the U8903A is 32 bits (Figure 4)
3. Return to the Design Filter page (Figure 4)




Figure 3. "Set quantization parameter" icon




Figure 4. Selecting "Single-precision floating-point" and "Return to the Design Filter page"


4
Instructions
4. Select the "Response Type" e.g. Lowpass, Highpass, Bandpass, and Bandstop (Figure 5)
5. Select the "Design Method" e.g. IIR or FIR (Figure 5)
6. Select the "Frequency Specifications" you require e.g. Fpass (1 and 2), Fstop (1 and 2) (Figure 5)

Requirements for Frequency Specifications: