Full-duplex Speakerphone
DIP Switches
122 Strata DK Digital Telephone 10/01
Figure 8 External Microphone Voice Pick-up Path
Speech Training Mode
When the DKT2020-FDSP is used in speakerphone mode, it adjusts to both the
telephone lines and rooms acoustic properties. At the beginning of each
speakerphone call, the echo canceller must perform Speech Training by evaluating
both the FDSP user and the far-end users voice, background noise and line quality.
To train the speakerphone
The parties at both the local telephone and on the far end should take turns
speaking for approximately 10 seconds.
To improve speaker quality
If the conversation becomes unstable during the call, or there is clipped speech,
feedback or short silences, first try adjust ing the volume. This forces the FDSP
phone into speech training mode. The LED will go on.
If conversation is still unstable, press button 10 to activate half-duplex mode. You
can turn off button 10 at any time to reactivate full-duplex mode.
5353
RFDM Super Directional Microphone