G.728

ADT G.728 C54x , C55x , C64x

The Adaptive Digital Technologies’ G.728 voice coder is a real-time implementation of the ITU G.728 toll quality voice coder. ITU G.728 has rapidly gained acceptance for many applications including satellite, cellular, and video conferencing systems. In fact, G.728 is specified as part of the H.320 international video conferencing standard. The reason for this rapid acceptance is that G.728 delivers the same toll quality voice as 32 kbps ADPCM in only half the bandwidth. The Adaptive Digital G.728 software is DAIS compliant.

The Adaptive Digital G.728 coder can be combined with a 32 kbps ADPCM converter to provide a compressed leg in your network until the G.728 is implemented end-to-end.

Data sheet: .pdf

Coding Rate: 16 kbps, 12.8 kbps, 9.6 kbps selectable at run time on the fly

Sampling Rate: 8 kHz

Delay: 2.5 msec (algorithmic)

FEATURES

Functions are C-callable
Can be integrated with echo cancellers, VOX and tone detection/regeneration.
C The encoder and decoder meet all ITU G.728 compliance and interoperability requirements.
Optional in-band synchronization available.
Adaptive Digital's G.728 C54x is xdais compliant.

AVAILABILITY

ADT 728 is currently available on the TMS320™ DSP Family

C54x™DSP and C64x™DSP Generations

Note: C55x™DSP Generation data presented are preliminary

SPECIFICATIONS

G.728 C54x

All Memory usage is given in units of 16-bit word.

Function	MIPS			Program Memory	Data Memory	Per-Channel Data Memory
	Coding Rate
	1600	12800	9600
Encode	24.24	19.66	17.93	--	--	650
Decode	16.5	16.5	16.5	--	--	1300

Last update: 08/23/2002

G.728 C55x

PRELIMINARY - All Memory usage is given in units of byte.

Function	MIPS	Program Memory	Data Memory	Per-Channel Data Memory
PRELIMINARY	35	18 K	1 K	3800

Last update: 01/26/2004

G.728 C64x

All Memory usage is given in units of byte.

Function	MIPS			Program Memory	Data Memory	Per-Channel Data Memory
	Coding Rate
	1600	12800	9600
Encode	16.5	14.5	13.5	41 K	3.1 K	1444
Decode	14.9	15.1	15.1	41 K	3.1 K	2140

Last update: 06/27/2005

FUNCTION

G728_ADT_initEnc(…);

G728_ADT_initDec(…);

G728_ADT_encode(…);

G728_ADT_decode(…);

APPLICATIONS

satellite

cellular

video conferencing systems