Full duplex and half duplex conversations, Speech method, P. 8-2 – Toa N-8000 Series User Manual

Page 602

8-2

Chapter 8

APPENDIX

1. FULL DUPLEX AND HALF DUPLEX CONVERSATIONS

1.1. Speech Method

The Packet Intercom system uses 5 types of methods for conversations between stations.

For conditions in which these speech methods are used, refer to the table on

1.1.1. Full duplex conversation between handset stations

This method is the same as that used for an ordinary

subscribed telephone.

Simultaneous two-way conversations are possible

between both parties.

(Refer to

p. 8-5, "Full duplex."

)

1.1.2. Full duplex conversation using an echo canceller

An echo canceller realizes simultaneous two-way

conversations between both parties.

(Refer to

p. 8-5, "AEC."

)

The echo canceller is a circuit to prevent echo or

feedback that possibly occurs when sound from the built-

in speaker enters the microphone.

1.1.3. Half duplex conversation using a voice switch

This is one-way conversation from a speaking station to

a listening station.

When a party speaks after the other party's speech has

ended, the speech transmission direction is reversed,

allowing two-way alternate conversations.

Note that speech overlapped during speech will not

change the transmission direction.

(Refer to

p. 8-5, "VS."

)

Full duplex conversation

One-way conversation