Toshiba CTX28 manual 11-56, Speech Training Mode, Special Button Operation Button

Station Apparatus

2000-series Telephones

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.

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Button 10 toggles between full- and half-duplex.

Figure 11-41 Button 10 on the Full-duplex Speakerphone

11-56 Strata CTX I&M 06/04