Audio Codec 정보

Number	Standard by	Description	Bit rate (kb/s)	Sampling rate (kHz)	Frame size (ms)	Remarks	MOS (Mean Opinion Score)
G.711 *	ITU-T	Pulse code modulation (PCM)	64	8	Sampling	U-law (US, Japan) and A-law (Europe) companding	4.1
G.721	ITU-T	Adaptive differential pulse code modulation (ADPCM)	32	8	Sampling	Now described in G.726; obsolete.
G.722	ITU-T	7 kHz audio-coding within 64 kbit/s	64	16	Sampling	Subband-codec that divides 16 kHz band into two subbands, each coded using ADPCM
G.722.1	ITU-T	Coding at 24 and 32 kbit/s for hands-free operation in systems with low frame loss	24/32	16	20
G.723	ITU-T	Extensions of Recommendation G.721 adaptive differential pulse code modulation to 24 and 40 kbit/s for digital circuit multiplication equipment application	24/40	8	Sampling	Superceded by G.726; obsolete. This is a completely different codec than G.723.1
G.723.1	ITU-T	Dual rate speech coder for multimedia communications transmitting at 5.3 and 6.3 kbit/s	5.6/6.3	8	30	Part of H.324 video conferencing. It encodes speech or other audio signals in frames using linear predictive analysis-by-synthesis coding. The excitation signal for the high rate coder is Multipulse Maximum Likelihood Quantization (MP-MLQ) and for the low rate coder is Algebraic-Code-Excited Linear-Prediction (ACELP).	3.8-3.9
G.726	ITU-T	40, 32, 24, 16 kbit/s adaptive differential pulse code modulation (ADPCM)	16/24/32/40	8	Sampling	ADPCM; replaces G.721 and G.723.	3.85
G.727	ITU-T	5-, 4-, 3- and 2-bit/sample embedded adaptive differential pulse code modulation (ADPCM)	var.		Sampling	ADPCM. Related to G.726
G.728	ITU-T	Coding of speech at 16 kbit/s using low-delay code excited linear prediction	16	8	2.5	CELP.	3.61
G.729 **	ITU-T	Coding of speech at 8 kbit/s using conjugate-structure algebraic-code-excited linear-prediction (CS-ACELP)	8	8	10	Low delay (15 ms)	3.92
GSM 06.10	ETSI	Regular­Pulse Excitation Long­Term Predictor (RPE-LTP)	13	8	22.5	Used for GSM cellular telephony.
LPC10	USA Government	Linear-predictive codec	2.4	8	22.5	10 coefficients.
Speex			8, 16, 32	2.15-24.6 (NB) 4-44.2 (WB)	30 ( NB ) 34 ( WB )
iLBC			8	13.3	30
DoD CELP	American Department of Defense (DoD) USA Government		4.8		30
EVRC	3GPP2	Enhanced Variable Rate CODEC	9.6/4.8/1.2	8	20	Se usa en redes CDMA
DVI	Interactive Multimedia Association (IMA)	DVI4 uses an adaptive delta pulse code modulation (ADPCM)	32	Variable	Sampling
L16		Uncompressed audio data samples	128	Variable	Sampling