Toa EXES-6000, Operating And Troubleshooting

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Fig. 24 Status of Logic and Voice Signal Flow
in Handset to Hands-Free Mode
At last, both VOICE SWITCHES (A) and (B) close,
providing full duplex conversation. In this event,
SIDE TONE CIRCUIT is not activated.
The side tone circuit is a circuit that enables a
talker using a station handset to hear his own
voice through a handset ear speaker. In the case
of the conversation mode used in this section, a
voice spoken into the mic of station A comes out
of the speaker of station B. But now that station B
is in the hands-free mode, that voice from the
speaker is fed back to its mic, which in turn can be
heard through the handset ear speaker of station
A, thus eliminating the necessity of activating the
side tone circuit. See Fig. 25.
Fig. 25 Side Tone on Handset to Hands-Free Conversation
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STATION A
STATION B