CONTENTS

 1     Scope 
 2     References 
 3     Terms and definitions       
 4     Acoustic echo processing 
        4.1     Analogue components        
        4.2     Functional units of an acoustic echo controller         
        4.3     Interaction between terminal echo control and signal processing network equipment
        4.4     Delay     
        4.5     Acoustic echo control specifications           
 5     Noise reduction
        5.1     Analogue components        
        5.2     Functional units of a noise reduction system
        5.3     Interaction between terminal noise reduction and signal processing network equipment    
        5.4     Noise reduction processing delay   
        5.5     Noise reduction system specifications