This application note describes how to measure and analyze the performance of a loudspeaker and how to compensate the frequency response using the ST Speaker Tune software, a tool available in the APWorkbench.
This document describes the process of measuring and analyzing loudspeaker performance to improve audio quality. It details the mechanical and electrical models of a loudspeaker and explains how to compensate for frequency response deficiencies.
The text focuses on using the ST Speaker Tune tool, available within the APWorkbench software, to automatically generate an equalization curve. This curve reflects the inverse of the speaker's frequency response, resulting in a flatter overall response and improved listener experience in applications like flat-screen TVs.
A loudspeaker is an electro-acoustic transducer that converts an electrical signal from an audio power amplifier into the movement of a diaphragm to create sound.
A passive filter uses only inductors and capacitors and is placed in the speaker cabinet, while an active filter uses operational amplifiers or DSPs and is implemented after the pre-amplifier.
The subwoofer reproduces the lowest portion of the audio band, which is usually below 200 Hz.