AEC, Acoustic Echo Cancellation

Table of contents

• Overall Architecture
• Input
• Problem Setting
• LMS
• NLMS
• FastBlockLMS
• RLS

Overall architecture

The following architecture defines the Acho Problem

⚙️ Software & Tools

 

Input

• Source Singal, S(n)

 

• Reference Signal, U(n)
  • Laplacian white noise

 

- Speech signal

 

Problem Setting

n : discrete time, n=0, 1, 2, ...

s(n) : source signal

u(n) : reference signal

d(n) : primary input signal

 

w(n) : adaptive filter coefficient

y(n) : filter ouotput signal

 

e(n) : error

 

LMS

Filter 1

• Laplacian white Nosie

 

• Speech signal

 

Filter 2

• Laplacian white Nosie

 

• Speech signal

 

NLMS

Filter 1

• Laplacian white Nosie

 

• Speech signal

 

Filter 2

• Laplacian white Nosie

 

• Speech signal

 

FastBlock LMS

Filter 1

• Laplacian white Nosie

 

• Speech signal

 

Filter 2

• Laplacian white Nosie

 

• Speech signal

 

RLS

Filter 1

• Laplacian white Nosie

 

• Speech signal