ADT公司G729 方案指标

ADT公司G729 方案指标

G.729 Voice Compression Algorithm and its many annexes

G.729 is used in wireless voice, voice-over-packet-networks, multimedia, and voice circuit multiplexing applications.

FEATURES

1. Functions are C-callable.
2. Multi-channel capable.
3. The encoder and decoder meet all ITU G.729 compliance and interoperability requirements.
4. Can be integrated with echo cancellers.
5. Capable of in-band synchronization.
6. Available as part of Adaptive Digital’s G.PAK turnkey DSP software packages

Platform	G.729	G.729 A	G.729 B	G.729 AB	G.729 D	G.729 F	G.729 I & E
TI TMS320C64x+ / C66x	Available	Available	Available	Available	Available	Available
TI TMS320C67/674x	Available	Available	Available	Available	Available	Available	Available
TI TMS320C64x	Available	Available	Available	Available	Available	Available
TI TMS320C62x				Available
TI TMS320C55x	Available	Available	Available	Available	Available
TI TMS320C54x	Available	Available	Available	Available	Available
ARM9E				Available
ARM11				Available
ARM Cortex A8		Available		Available
ARM Cortex A9		Available		Available
ARM Cortex A15		Available		Available
ARM Cortex M3		Available		Available
ARM Cortex M4		Available		Available
Win32 Static**				Available	Available
Win32 DLL**		Available		Available	Available

** Windows 32 DLL - Contact Sales for specifications.

DESCRIPTION

The Adaptive Digital Technologies' G.729 voice coder software is an implementation of ITU Recommendation G.729 8 kbit/s CS-ACELP Speech Codec.

G.729 is an umbrella of vocoder standards. The G.729 vocoders perform voice compression at bit rates that vary between 6.4 and 12.4 kbps. The figure below shows an example of the G.729 vocoder connected to a digital communication channel. The input speech is fed into the G.729 encoder as a stream of16-bit PCM samples, sampled at a rate of 8000 samples/second. The G.729 encoder compresses the data into the Encode Stream. The encoder also outputs the DTX status, which is discussed later in this data sheet. The digital channel carries the data stream and DTX status to the decoder, which regenerates a representation of the original speech, and outputs it as the output speech – again as 16-bit PCM at a sampling rate of 8000 samples/second. Since G.729 is a uses lossy compression, the output speech is not identical to the input speech.

The decoder is also fed a frame erase flag, which is an indication that the decode stream has temporarily been corrupted. The decoder is able to “smooth over” the output , doing its best to conceal the loss of data and minimize the loss in voice quality. This process is known as packet loss concealment (PLC). It works surprisingly well even under high packet loss rates.

Adaptive Digital's G.729AB voice compression algorithm is a highly optimized version of the G.729 ITU Annex A and Annex B standard. G.729 AB offers toll quality speech at a reasonably low bit rate of 8Kbps. The G.729 AB codec uses Discontinuous Transmission (DTX), Voice Activity Detection (VAD), and Comfort Noise Generation (CNG) to reduce bandwidth usage. G.729AB is used in wireless voice, voice-over-packet-networks, multimedia, and voice circuit multiplexing applications.

Data sheet .pdf  

Click here for G.729 information on the following topics. G.729 comparisons and differences.

✓ DECIPHERING THE MANY ANNEXES & APPENDICES of G.729

✓ PATENT ISSUES

✓ COMPARISON SHOPPING

SPECIFICATIONS

TI TMS320C6000

G.729 C64x, C64x+ / C66x

CPU UTILIZATION & MEMORY REQUIREMENTS

All Memory usage is given in units of byte.

Annex AB	Function	MIPS	Program Memory	Data Memory	Scratch Memory	Per Channel Data Memory
G.729AB C64x	Enc	5.2	--	--	2400	2148
	Dec	1.2	--	--	800	2200
	Enc/Dec	6.3	63k	6.7k	3200	4344
G.729AB C64x+ / C66x	Enc	4.8	--	--	2400	2148
	Dec	1.2	--	--	800	2200
	Enc/Dec	6.0	57k	6.7k	3200	4344

Annex D	Function	MIPS	Program Memory	Scratch Memory	Per Channel Data Memory
G.729D C64x	Enc	20.5 (8 kbps)   17.1 (6.4 kbps)	--	--	2392
	Dec	4.1 (8 kbps)  4.4 (6.4 kbps)	--	--	1572
	Enc Dec	24.6  (8 kbps)   21.5 (6.4 kbps)	124K	8192	3964

Annex B & F	Function	MIPS	Program Memory	Data Memory	Scratch Memory	Per Channel Data Memory
G.729B / G.729F C64x	Enc	20.4	--	--	8192	2388
	Dec	4.7	--	--	0	1568
	Enc Dec	25.7	119k	7.2K	8192	3956
G.729B / G.729F C64x+ / C66x	Enc	19.6	--	--	8192	2388
	Dec	5.1	--	--	0	1568
	Enc Dec	24.7	84k	7.2K	8192	3956

C674x

CPU UTILIZATION & MEMORY REQUIREMENTS

Annex AB	Function	MIPS	Program Memory	Data Memory	Scratch Memory	Per Channel Data Memory
G.729I*	Enc	33	--	--	--	3776
	Dec	12	--	--	--	2560
	Enc/Dec	45	121k	500	8000	6336

CPU UTILIZATION & MEMORY REQUIREMENTS

Annex AB	Function	MIPS	Program Memory	Data Memory	Scratch Memory	Per Channel Data Memory
G.729E	Enc	42	--	--	--	3776
	Dec	18	--	--	--	2560
	Enc/Dec	60	174k	500	800	6336

*G.729  B, D, E - G.729 Annex I combines G 729 D (6.4kbps rate) ,
G729 (8kbps rate) and G729 E (11.8 kbps rate).  Annex B is integrated into
all 3 rates. Giving 5 different possible rates: 0, 1.6k, 6.4k, 8k and 11.8k The
3 bit rates are switchable frame to frame by the host.

C6x

CPU UTILIZATION & MEMORY REQUIREMENTS

Annex AB	Function	MIPS	Program Memory	Data Memory	Scratch Memory	Per Channel Data Memory
G.729AB C62x/67x	Enc	5.2	--	--	2400	2148
	Dec	1.3	--	--	800	2200
	Enc/Dec	6.5	72k	6.1k	3200	4344

TI TMS320C5000

G.729 C55x

CPU UTILIZATION & MEMORY REQUIREMENTS

All Memory usage is given in units of byte.

C55x	Function	MIPS	Program Memory	Data Memory	Scratch Memory	Per Channel Data Memory
G.729AB	Enc	8.3	28354	9272	1976	2156
	Dec	2.0	13654	6310	436	1848

C55x	Function	MIPS	Program Memory	Data Memory	Scratch Memory	Per Channel Data Memory
G.729B	Enc	37	33421	9120	4960	2400
	Dec	7.8			1024	1440

C55x	Function	MIPS	Program Memory	Data Memory	Scratch Memory	Per Channel Data Memory
G.729D	Enc	32.2 (8 kbps) 20.5 (6.4 kbps)	24780	6570	4960	1980
	Dec	5.9 (8 kbps) 6.4 (6.4 kbps)	12607	6574	1024	1416
G.729D	Enc/Dec	38.1 (8 kbps) 26.9 (6.4 kbps)	28040	6630	4960	3396

G.729 C54x

CPU UTILIZATION & MEMORY REQUIREMENTS

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

C54x	Function	MIPS	Common Program Memory	Program Memory	Data Memory	Common Data Memory	Per Channel Data Memory
G.729	Enc	18.07	2086	6191	194	3100	808
	Dec	3.0	2086	2908	113	3100	670
G.729A	Enc	9.7	2162	6215	194	2899	976
	Dec	1.8	2162	1989	113	2899	838
G.729B	Enc	18.9	4223	8571	194	3401	763
	Dec	3.2	4223	3552	113	3401	670
G.729AB	Enc	10.0	4236	8567	246	3200	931
	Dec	2.2	4236	2625	113	3200	838

ARM ® DEVICES

G.729 ARM Cortex-A8/A9/A15

CPU UTILIZATION & MEMORY REQUIREMENTS

All Memory usage is given in units of byte.

Annex AB	Function	MIPS A8/A9/15	Program Memory	Data Memory	Scratch Memory	Per Channel Data Memory
G.729AB, G.729A	Enc	22.5	--	--	2400	2148
	Dec	8.3	--	--	800	2200
	Enc/Dec	30.8	124.5K	6080	3200	4348

G.729 ARM Cortex-M3/M4

CPU UTILIZATION & MEMORY REQUIREMENTS

All Memory usage is given in units of byte.

Annex AB	Function	MIPS M3/M4	Program Memory	Data Memory	Scratch Memory	Per Channel Data Memory
G.729AB, G.729A	Enc	25	--	--	2400	2148
	Dec	11	--	--	800	2200
	Enc/Dec	35	73024	6016	3200	4348

G.729 ARM9E / ARM11

CPU UTILIZATION & MEMORY REQUIREMENTS

All Memory usage is given in units of byte.

Annex AB	Function	MIPS	Program Memory	Data Memory	Scratch Memory	Per Channel Data Memory
G.729AB G.729A	Enc	27.3	--	--	2400	2148
	Dec	10.9	--	--	800	2200
	Enc/Dec	38.2	142.2k	6016	3200	4348

 

API function call summary

G729_ADT_encodeInit(. . .)   
            Initializes
the G.729 encoder software
G729_ADT_decodeInit(. . .)   
            Initializes
the G.729 encoder software
G729_ADT_encode(. . .)       
            Executes the
G.729 encoder         
G729_ADT_decode(. . .)       
            Executes the
G.729 decoder
G729_ADT_Annex_(A. . .I)_encoderInit(. . .)   Initializes the G.729
(A. . .I)_ encoder software
G729_ADT_Annex_(A. . .I)_decoderInit(. . .)   Initializes the
G.729 (A. . .I)_ encoder software
G729_ADT_Annex_(A. . .I)_encode(. . .)    Executes the G.729 (A.
. .I)_ encoder    
G729_ADT_Annex_(A. . .I)_decode(. . .)    Executes the G.729 (A.
. .I)_ decoder