User's Manual

7
7
Echo & Noise Cancellation
z DSP(Digital Signal Processor) integrated in A1 eliminates echo and noise
thereby providing clear voice quality even under harsh environmental
conditions.
z If A1 is used as ‘Car Handsfree’ mode in car, it eliminates surrounding noise
(engine noise, wind noise, surrounding noise, radio sound etc.) and delivers
clear voice to the other party. Also, it eliminates echo signals created by
transmission of car speaker
sounds to the microphone. The
above mechanism for echo and
noise cancellation is realized
through the use of 2 microphone
system and high-tech algorithm
which cancels out unnecessary
noise and delivers only the user
voice. The directional
microphones process only the
user voice signal and therefore,
for best performance for use in
car, mount the A1 onto sun visor.
z On the other hand, if A1 is used as ‘Speakerphone’ mode, it doesn’t matter in
which direction the A1 is placed
as noise signals generated from
all directions will be processed
thereby making it suitable for
conference calls. However, it is
important to note that the
performance of ‘Speakerphone’
mode may not be as good as
‘Car Handsfree’ mode since it
allows influx of noise from all
directions and this mode is only
recommended for use in quiet
environment.
z The transition from one mode to
another and vice-versa takes place automatically. That is, if A1 is placed
upright, ‘Speakerphone’ mode will be activated and likewise, if it is placed
upside down, ‘Car Handsfree’ mode will be activated. However, this automatic
mode transition doesn’t take effect during talk mode.