CONTENTS

 1     Introduction
 2     References
 3     Effect of echo
 4     Active echo control devices
        4.1     Application guidelines
 5     Additional echo control rules
        5.1     Rules for connections with echo control devices
                  5.1.1     Ideal rules
                  5.1.2     Practical rules
        5.2     General rules (for connections with or without echo control devices)
                  5.2.1     Ideal rule
                  5.2.2     Practical rules
 6     Insertion of echo control devices in a connection
 7     Speech processing devices
Appendix I – Assessment of talker echo effects