Toshiba Strara CTX Series, Installation And Maintenance Manual, Page: 245 / 290

Station Apparatus
7-47
Strata CTX I&M September 2002
Speech Training Mode
When the DKT2020-FDSP is used in speakerphone mode, it adjusts to both the telephone line’s and
room’s 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 user’s 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 adjusting 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.
➤
To force the telephone into Speech Training mode
➤
During a call, momentarily press
Vol
▲
,
Vol
▼
,
Hold
or
MIC
.
During Speech Training mode, the speakerphone operates in half-duplex mode.
Tips for best results
◆
Avoid blocking the microphone or shuffling paper near the microphone.
◆
Avoid placing the speakerphone where it can detect excessive background noise, especially during
Speech Training mode.
◆
Avoid moving the telephone during a call—this changes the room’s acoustic properties. If the
telephone or microphone is moved, you may have to force the Speech Training mode.
Special Button Operation (Button 10)
When using the external or Internal Microphone, button 10 works as a toggle from full- to half-duplex
on the DKT2020-FDSP.
5241
Button 10
toggles
between full-
and half-duplex.
Figure 7-42 Button 10 on the Full-duplex Speakerphone