A comparison of 8 KHz mono audio formats

8KHz mono audio formats
Audio format	16-bit PCM	G.711 mu-law	32Kbps MPEG-1	IMA/DVI ADPCM	GSM 06.10	InterWave VSC112	TrueSpeech 8.5	RealAudio v1.0	ToolVox for the Web
File extension	.wav or .aiff	.au	.mpa or .mp2	.wav	.gsm	.vmf	.wav	.ra	.vox
Data rate	128Kbps	64Kbps	32Kbps	32Kbps	13.2Kbps	11.2Kbps	8.5Kbps	8Kbps	2.4Kbps
File size per minute	960K	480K	240K	240K	96K	82K	62K	59K	18K
Compression factor	1:1	2:1	4:1	4:1	10:1	11:1	15:1	16:1	53:1
Sound quality	5 (sample)	4 (sample)	4 (sample)	3 (sample)	2 (sample)	2 (sample)	2 (sample)	1 (sample)	0-3 (sample)
Relative compression speed	N/A	10	(not tested)	1.2	0.75	3	0.5	0.2	0.25
Windows player	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Mac player	Yes	Yes	Yes	Yes	Yes	No	Yes	Yes	Yes
Unix player	Yes	Yes	Yes	Some	Yes	No	No	only v2.0	Promised
Supports higher sample rates	Yes	Yes, but rarely used	Yes	Yes	No	Yes	No	in v2.0	in other products
Streaming playback file	None	None	None	None	.gsd	.vmd	.tsp	.ram	None
Credits	None	None	None	None	None	In .vmd file	None	In .ra file	None