G.168 Echo Canceller - ARM

Carrier class Echo Canceller ARM

The Adaptive Digital Technologies G.168 Echo Canceller is a toll-quality, International Telecommunication Union G.168 compliant line EC. The EC cancels electrical echo arising from 2/4 wire hybrid interface impedance mismatches.

Adaptive’s G.168 includes two optimized variants: a short and a long echo tail variant.

The short tail variant is ideal for access devices whereas the long tail version is well suited for gateways and central office equipment.

Adaptive Digital's Echo Canceller has been Qualified As Toll-Quality by AT&T

FEATURES

Functions are C-callable
Multiple channel operation
Parameters are user configurable
Non-linear processor
Comfort Noise Generator
Automatic Tail Search
Cancels multiple independent echo tails
VQE
Fast Convergence
No divergence due to doubletalk
Stationary signal detector improves performance in the presence of tones
Tone Disabler disables echo canceller during voiceband modem connections
Convergence monitor

AVAILABILITY

ADT G.168-2004 is available on the TMS320™ DSP Family

ARM 7 & 9

and also C54x™DSP, C55x™DSP, C64x™DSP & C64x+™DSP Generations

SPECIFICATIONS

ARM 7 & 9

All memory requirements are in units of 16-bit words. MCPS (Million Cycles Per Second) is used rather then MIPS.

Tail Length	MCPS (Peak)		Program Memory	Data Memory	Per-Channel Data Memory
Tail Length	ARM7	ARM9	Program Memory	Data Memory	Per-Channel Data Memory
8 msec	20	18	7000	686	374
16 msec	32	29	7000	901	497
32 msec	35	30	9750	1148	704
64 msec	53	45	9750	1705	1072
128 msec	77	66	9750	2699	1728
Tone Disabler	included		included	included	included

Last update: 4/20/2006

FUNCTION

LEC_ADT_g168Init(…) Initializes echo canceller channel

LEC_ADT_g168Cancel(…) Executes cancellation function