Toa N-8000 Series Ver.1.41 - Manual (Page 57)

2-5
Chapter 2: FUNCTIONS AND OPERATION
2. CONVERSATION FUNCTIONS AND OPERATION
2.1. Conversation
2.1.1. Hands-free conversation
Permits conversations to be
made without holding the
handset when another party is
called or when a call is received
in automatic connection mode.
or
Duplex conversations
R e - m e a s u r i n g
2.1.2. Handset conversation
Calls can be made or received by
lifting the handset.
[Ambient Noise Level Measurement]
The master station has a function to measure ambient noise level at its installation site, automatically making
the internal setting for proper hands-free conversation. (Since IP stations are so designed as to always
perform proper hands-free conversation, they need not make the measurement.)
If a malfunction of hands-free conversation such as one-way conversation from the station in high ambient
noise area occurs, recalibrate by re-measuring ambient noise as follows.
With the handset in place, press the [ ] key and then the
[ ] key to begin ambient noise level re-measurement.
"Re-measuring" will appear on the LCD (if the N-8000MS station is
being used).
After about five seconds, a confirmation tone sounds to indicate that
ambient noise re-measurement has been completed.
Tip
The master station automatically measures the ambient noise level
when the Exchange is powered up or the station is connected to the
line. During the measurement, the station's status indicator flashes and
the dial operation cannot be performed.
Duplex conversations
or
[Operation when both stations are engaged in hands-free conversation]
In "hands-free to hands-free" conversation between both stations, simultaneous two-way conversation is
established by way of an echo canceller* and voice switch employed in each station.
During this conversation, station's internal settings (parameters relating to the condition of sound reflection)
are constantly updated in response to the change in sound collected by the built-in microphone, allowing for
optimum hands-free conversation.
When both stations make hands-free conversation after either one has been moved in a new environment or
the environment surrounding the station has significantly changed, this may cause acoustic feedback. In this
case, continue the conversation and the situation will soon return to the normal condition.
If acoustic feedback cannot be removed, adjust the microphone sensitivity and speaker output volume of the
station.
Note
Use the supplied N-8000 Software program (refer to
p. 5-52 , 5-56 ) to set the microphone sensitivity and
speaker output volume.
It is possible to set the master station's speaker output volume at the station. (Refer to
p. 2-4 .)
* An echo canceller is used to eliminate acoustic feedback caused when the voice outputs from the station's
speaker are picked up by the same station's microphone. As acoustic feedback cannot be eliminated
thoroughly, the echo canceller is usually used in conjunction with a voice switch.