Anc Tuning Guide; Feedback - AMS AS3460 User Manual

6

ANC Tuning Guide

The following section will demonstrate how to tune a feedback system.
6.1

Feedback

6.1.1 Theory
In a feedback ANC system, the microphone is positioned inside the ear cup, next to the speaker. The
microphone is sensing the noise coming from outside, already damped by the passive attenuation of
the headphone cup. Also, the microphone senses the output of the speaker, building a feedback loop,
therefore the system is a closed loop system.
Figure 108:
System Description
Using the system description in the Figure 108, the goal of a feedback ANC system can be stated as:
Equation 1:
Demo Kit Manual • PUBLIC
UG000480 • v1-00 • 2020-Jun-30
Document Feedback
Y ( s ) = 0
AS3460
ANC Tuning Guide
│ 82
107