Specifications

EAW Smaart 6 Operation Manual Analysis Modes and Display Types

3.2 Frequency Response Measurements

Smaart’s real-time Frequency Response measurement capability is an extremely useful

tool for setting up sound system equalizers and crossovers. Frequency Response mea-

surements compare the input and output signals of a device or system under test, using

a mathematical calculation called a transfer function, to determine the difference between

them. This enables Smaart to calculate the system’s frequency magnitude and phase

response very precisely. This dual-channel approach has the additional advantage of

working with a wide variety of test signals, including music and other recognizable

program material.

3.2.1 Basic Frequency Response Measurement Setup

This example illustrates a typical Frequency Response measurement system setup to

measure and optimize a simple sound system.

Figure 3-7 Block Diagram of a Frequency Response Measurement

To make a frequency response measurement of a system, split the test signal at the source

and send it to both the SUT and the computer input designated as Smaart’s reference

signal input. The output of the system is then returned to Smaart’s measurement signal

input. Not that this setup is also used for delay and impulse response measurements,

which are obtained from the transfer function calculation. For more specific details on set-

ting up for frequency and impulse response measurements, see Chapter 4: Applications.

Reference Signal

Measurement

Signal

Device or

System

Under Test

Computer

Signal

Source