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audec - a VoIP leading multimedia voice engine |
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As quick development of INTERNET, VoIP is more important in our life. And the most important aspect of VoIP communication is the voice quality.
AVCON has successfully developed new generation multimedia voice engine-audec- by its own experienced R&D team. audec multimedia voice engine overcomes disadvantages in the traditional VoIP voice process technology relying on high definition and effective algorithm, such as: echo tail, noise disturbance and other kinds of problem. Audec actually reached prefect echo and noise processing performance, hi-fi voice, AEC, AGC, NC, VAD, and Jitter Buffer and etc. It is real technology of total linear acoustic echo elimination.
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Features |
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The leading technique of total linear acoustic echo cancellation
·500ms long EchoTail process brings you back clean communication environment, as well as echo path change, several acoustic reflection handling. It survives all sorts of environment.
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Excellent duplex echo cancellation,
clear voices no shatter
·Audec can eliminate the echo under duplex
sound environment and keep the voice quality
over 52dB, which means nearly noiseless echo
in duplex communication. |
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Powerful ability of Background Noise
Elimination
·Without vast noise characters database, by
adaptive statistical technique, audec
multimedia voice engine can identify
speaker's voice from forceful noise no
matter where it is from: roar machines or
vehicle at the speed of 180kmph. |
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Optimum packet-loss
recovery technique, lowest network delay
·Since the packet-loss recovery proportion
can be up to 33% and together with audec
Jitter Buffer which is able to handle 60-100
millisecond jitter, audec multimedia voice
engine ensure you top voice quality even in
bad network condition. |
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Transfer easily, reduce
development cost
·By audec multimedia voice engine technique,
VoIP developers and manufacturers have the
possibility to concentrate on products core
features development without considering
complex audio problems. It is low
development cost, short promotion time for
these developers and manufacturers. |
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Demonstration |
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AEC Demo
It is one video conferencing echo
cancellation test in a typical conference
room. The room is 5m (L) 3m (W) 3m (H), 3
concrete walls, no decoration and no holes
in smooth suspended ceiling and one big
glass wall, real wood floor. It has strong
reflective mixing. We placed 4 high
sensitive surfaced microphone.
(Conference Room)
The remote music is
disappeared after processed by audec
multimedia voice engine.
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NC Demo
In one room, we put high-power cooling fan
by the sensitive surfaced microphone to test
audec multimedia voice engine.
You can learn that the voice
is clear and noise is kept down. |
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Practical Experience
We access to INTERNET by notebook PC and
CDMA X1 in a vehicle at the speed of 120KM.
We communicate with remote staffs by AVCON
Video Conferencing System equipped with
audec multimedia voice engine. Mixed with
wind sound outside and counting voice from
remote staffs, it is hardly to enjoy the
music played by local vehicle.
You can learn from our test
that remote users hear a clear speaking
voice and clean music. |
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Standards |
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AEC
·Support G.165 acoustic echo cancellation
norms; Support G.168 linear echo
cancellation norms
·EchoTail handling as long as 500ms
·Deal with several times acoustic reflection
and duplex disturbance; Support to change
echo path
·Adaptive but no internal time delay
·Support sample rate from 8kHz to 96khz
·Convergence time less than 30ms
·Eliminate the duplex echo effectively,
voice quality over 52db; duplex |
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NC
·Convergence time is 1-2s;
·Suppress static noise of 18dB, and dynamic
noise of 20dB;
·Support sample rate from 8kHz to 96khz
·Ensure normal volume and quality while echo eliminating; |
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AGC
·Over 52dB high quality voice;
·Support sample rate from 8kHz to 96khz;
·Maximum +14dB (adaptive); Minimum -4dB;
·Small CPU occupied and little complexity of
operations |
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