G.168 Plus™ Packet EC

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 32 msec 128 msec
512 msec *
Tandem Free Operation * X X
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

* indicates that this feature is an enhancement beyond the G.168 recommendation

C64x

All Memory usage is given in units of byte.

Tail Length

MIPS (Peak)

Program Memory

Data Memory

Per-Channel Data Memory

8 msec. tail

1.6

18208

722

1086

16 msec. tail

2.7

18208

850

1478

32 msec. tail

3.2

18208

1106

2262

64 msec. tail

3.6

23712

2540

3502

128 msec. tail

3.7

23712

3756

5240

256 msec. tail

4.1

23712

5738

7710

384 msec. tail

4.5

23712

7940

10426

512 msec. tail

5.0

23712

10600

13598

NOTE: Characterized with PCM Slip Correction disabled. Tail lengths of 256, 384, & 512 msec. are only supported in the G.168 Packet EC.

Last update: 09/17/2007

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.

Adaptive Digital’s G.168+ packet echo canceller software currently runs on several platforms including: Texas Instruments Incorporated’s (TI) high-performance TMS320C6000™ DSP and intel’s x86 line of processors. The software is offered in library format, fixed point C-reference code, and as part of Adaptive Digital’s Application Specific Signal Processing chips.

Contact us f or more information on the Echo Canceller algorithm, one of our products or custom solutions, contact us at 610-825-0182

 

 

 

 

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