Appeal No. 2003-2065
Application 09/881,441
schematic diagram of a packet-based communications network
comprising communications network nodes modified for use in
Appellants’ invention. Figure 2 is a schematic diagram of two of
the communications network nodes of Figure 1 in more detail.
Figure 3 is a flow diagram of a method carried out by one of the
communications terminals nodes of Figure 2. Figure 4 is a flow
diagram of a method carried out by the other communications
network node of Figure 2. See page 11 of Appellants’
specification. As shown in Figure 2, both node A and node B
comprise a memory with stored test voice information 21. In
addition, nodes A and B each have a processor 22, 23. Node A’s
processor 23 is arranged to add test voice information to an
ongoing voice call while node B processor 22 is arranged to carry
out a speech quality algorithm. See page 11 of Appellants’
specification. In particular, node A’s processor is arranged to
identify silent periods during the voice call and to add packets
comprising test voice information to the call during those silent
periods. See page 12 of Appellants’ specification. Node A
transmits the packets for the voice call, including the test
information to node B. Node B receives the packets and is able
to separate the received test voice information from the real
voice information. The received test voice information is
2
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