ECHO CANCELLATION LINE & NETWORK - G.168 Plus™ Packet Echo Canceller

G.168 Plus Packet, World Class Echo Canceller C64x+ Packet EC

Adaptive Digital's echo canceller (G.168 Plus Packet EC) is able to handle round-trip delays of 512 milliseconds. Furthermore, our echo canceller is packet-loss aware and is able to mitigate the specific effects that packet loss has on echo cancellation in the VoIP network.

Packet Loss: If an echo canceller is placed on the opposite side of a packet network with respect to the hybrid, a lost packet causes an interruption in the echo path. This can cause an echo canceller to diverge.

Adaptive Digital’s echo canceller is offered in three variants, which are compared by feature set in the following table.

Feature	G.168 LEC	G.168 NEC	G.168+ Packet EC
Maximum Tail Length	16 msec	128 msec	512 msec
Tandem Free Operation	--	X	X
High Efficiecty Tandem Free Operation	--	--	X
Packet Loss Concealment	--	--	X
PCM Slip Correction	--	X	X
Dynamic NLP	X	X	X
Comfort Noise Generator	X	X	X
Rapid Convergence	X	X	X
Automatic Tail Search	--	X	X
Cancels multiple reflectors	X	X	X
Convergence Monitor	X	X	X
Tone Disabler	X	X	X
SS7 Tone Detection	--	X	X
Double-talk Detection	X	X	X
Stationary Signal Detector	X	X	X
Pre-NLP Signal Available	X	X	X
Split Pre- and Post- Processing	X	X	X
Handles Residual Acoustic Echo	X	X	X
eXpress DSP™ compliant	X	X	X
Functions are “C” callable	X	X	X
User Configurable Parameters	X	X	X

C64x

All Memory usage is given in units of byte.

Tail Length	MIPs (Peak)	Program Memory	Data Memory	Per-Channel Data Memory
16 msec	3.5	24640	1330	1574
32 msec	4.1	24640	1586	2390
64 msec	4.5	31296	3110	3552
128 msec	4.7	31296	4326	5408
*256 msec tail	5.1	31296	6758	9120
*384 msec tail	5.6	31296	9190	12832
*512 msec tail	6.2	31296	11622	16544

* NOTE: Tail lengths of 256, 384, & 512 msec. are only supported in the G.168Plus™ Packet EC.
Last update: 09/10/2008

C64x+

Tail Length	MIPs (Peak)	Program Memory	Data Memory	Per-Channel Data Memory
C64x+ - Tail Lengths of 256, 384, & 512 msecs are supported only in the G.168 Packet EC.
16 msec	2.4	18336	1330	1574
32 msec	2.9	18336	1568	2390
64 msec	3.3	24352	3110	3552
128 msec	3.9	24352	4326	5408
*256 msec	4.3	25824	6758	9120
*384 msec	4.6	25824	9190	12832
*512 msec	5.2	25824	11622	16544

* NOTE: Tail lengths of 256, 384, & 512 msec. are only supported in the G.168Plus™ Packet EC.

Last update:09/10/2008

With G.168+/Packet EC, Adaptive Digital strives to meet the current and future requirements of service providers, system developers, and end-equipment manufacturers bringing superior voice quality to speech-based applications. By continually evolving their echo cancellation algorithm, Adaptive Digital strives to increase the differentiation between their world class EC and those of their competitors.

For more information on our echo canceller algorithms and solutions,
please contact us at 610-825-0182