G.723.1 Voice Coder by Adaptive Digital

ADAPTIVE DIGITAL G.723.1 C54x , C55x , C6xx

PRODUCT DESCRIPTION

The Adaptive Digital Technologies’ G.723 voice coder is a real-time implementation of the ITU G.723.1 voice coder. It is used with many applications that require high quality, robust speech reproduction. G.723.1 is specified in numerous Voice-Over-Packet environments such as Voice-Over-IP, and Voice-Over-ATM.

G.723.1 Annex A , which specifies silence suppression, voice activity detection (VAD), discontinuous transmission (DTX), and comfort noise generation (CNG), is included.

Data sheet: .pdf

Coding Rate: 5.3 or 6.3 kbps G.723.1

Sampling Rate: 8 kHz

Delay: 37.5 msecs

FEATURES

Fixed bit rate (5.3 kbit/s with 20 byte 30 ms frames, 6.3 kbit/s with 24 byte 30 ms frames)
eXpress DSP™ Compliant.
Functions are C-callable.
Capable of in-band synchronization.
Can be integrated with echo cancellers, and tone detection/regeneration.
The encoder and decoder meet all ITU G.723.1 compliance and interoperability requirements.
C64x xDM Compliant: easy codec implementation and integration for DaVinci™ Technology

AVAILABILITY

ADT G.723.1 is available on the TMS320™ DSP Family

C54x™DSP, C55x™DSP, C62x™DSP, C64x™DSP, C64x+™DSP Generations

SPECIFICATIONS

G.723.1 C54x

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

Function	MIPS	Program Memory	Table Memory	Data Memory	Per-Channel Data Memory
5.3	16.5	13.03 K	4465	2 K	1.3 K
6.3	16.9	13.03 K	4465	21 K	1.3 K

G.723.1 Annex A *

Function	MIPS	Program Memory	Table Memory	Data Memory	Per-Channel Data Memory
5.3	22.6	14 K	10 K	1 K	1 K
6.3	20.56	14 K	10 K	1 K	1 K

Last update: 08/29/2005

*G.723.1 Annex A , which specifies silence suppression, voice activity detection (VAD), discontinuous transmission (DTX), and comfort noise generation (CNG), is included.

G.723.1 C55x STANDARD -

G.723.1 Annex A* - All Memory usage is given in units of byte.

Rate	MIPS	Program Memory	Data Memory	Stack	Per-Channel Data Memory
5.3	Encode - 11.2	21502	21716	80	1480
	Decode – 1.3				424
6.3	Encode - 11.2	21502	21716	80	1480
	Decode – 1.4				424

G.723.1 C55x LOW MEMORY-

G.723.1 Annex A*

All Memory usage is given in units of byte.

Rate	MIPS **	Program Memory	Data Memory	Stack	Per-Channel Data Memory
5.3	Encode - 11.2	21620	20744	80	1480
	Decode – 1.3				424
6.3	Encode - 11.2	21620	20744	80	1480
	Decode – 1.4				424

*G.723.1 Annex A , which specifies silence suppression, voice activity detection (VAD), discontinuous transmission (DTX), and comfort noise generation (CNG), is included.

**Note: The MIPS is measured when the program placed internally, and channel and tables are placed in the DARAM. For the low memory version build, the total MIPS usage increases by 0.5 MIPS.

Last update: 12/07/2007

G.723.1 C6x - Processor Utilization

G.723.1 Annex A* - All Memory usage is given in units of byte.

Processor Utilization		MIPS
Rate	Function	C62x	C64x	C64x+
5.3	Encode	6.1	7.8	7.2
5.3	Decode	0.6	0.7	0.62
6.3	Encode	5.7	7.3	7.0
6.3	Decode	0.57	0.7	0.62

Last update: 01/06/2010

Note: Please contact us for C67x specifications.

*G.723.1 Annex A , which specifies silence suppression, voice activity detection (VAD), discontinuous transmission (DTX), and comfort noise generation (CNG), is included.

C64x - Memory Utilization

All Memory usage is given in units of byte.

Function	Program Memory		Data Memory	Per-Channel Data Memory	Stack
Encode	Common 10112	40128	23812	1420	444
Decode	Common 10112	8920	21364	400	260

C64x+ - Memory Utilization

All Memory usage is given in units of byte.

Function	Program Memory		Data Memory	Per-Channel Data Memory	Stack
Encode	Common 10208	35232	23880	1420	444
Decode	Common 10208	9152	21432	400	260

FUNCTION

G723_ADT_initEnc(. . .)------Initializes the G.723 voice coder Encoder Channel

G723_ADT_initDec(. . .)---- Initializes the G.723 voice coder Decoder Channel

G723_ADT_encode(. . .)--- Executes the G.723 encoder

G723_ADT_decode(. . .)--- Executes the G.723 decoder

APPLICATIONS

video conferencing systems

multimedia

store/forward

satellite communications.