The Better codec for 8/12/16kbps Speech

nakTT · 17th July 2009, 18:25

Hi all,

May I know what is a good codec for 8/12/16kbps audio? The audio type is speech.

tetsuox · 17th July 2009, 18:43

Try Speex.

nakTT · 17th July 2009, 18:46

Updated: After some testings at 8kbps 8kHz, I found that Lame is better by far. Any other suggestion? From what I Know even Lame is not the best for this kind of low bitrate.

smok3 · 17th July 2009, 19:20

http://www.hydrogenaudio.org/forums/...hp/t44310.html

Skelsgard · 17th July 2009, 19:40

Have you tried AAC?
The SBR/PS that HE-AAC uses are really good for low bitrates.

These are some samples using a 16kHz mono 16bit WAV file (resampled from a 44.1kHz stereo 16bit track).
http://rapidshare.com/files/256928348/Time_to_Relax.wav
http://rapidshare.com/files/256928382/Time_to_Relax.mp3
http://rapidshare.com/files/256928408/Time_to_Relax.mp4

nakTT · 17th July 2009, 20:07

I have tried HE-AAC V2 (my focus is more on 8kbps) but it produce a background sound like a grinding sound when the person who speak press a high pitch voice even when I increased the bitrate to 12kbps and then 16kbps.

Forgive me for my english.

smok3 · 17th July 2009, 20:36

can you provide a short sample ~30s?

nakTT · 17th July 2009, 20:44

Sure. But I have one problem. Can you suggest one good freeware mp3 cutter that cut the mp3/mp4(AAC) without re-encode.

smok3 · 17th July 2009, 20:57

open the mp3 in audacity or similar editor, cut the 30s out and then save as flac (which is lossles), post that flac somewhere (oh, and select the part when the grinding is the most obvious in your tests of course)

nakTT · 29th July 2009, 06:20

Problem solved with Windows Media Encoder 9 Voice.

Thanks to everyone here for your help.

17th July 2009, 18:25	#1 \| Link
nakTT Registered User Join Date: Dec 2008 Posts: 415	The Better codec for 8/12/16kbps Speech Hi all, May I know what is a good codec for 8/12/16kbps audio? The audio type is speech. Last edited by nakTT; 18th July 2009 at 07:02.

17th July 2009, 18:43	#2 \| Link
tetsuox Registered User Join Date: Dec 2008 Posts: 58	Try Speex. __________________ foobar2k ~ MPC-HC ~ ffdshow-tryouts

17th July 2009, 18:46	#3 \| Link
nakTT Registered User Join Date: Dec 2008 Posts: 415	Updated: After some testings at 8kbps 8kHz, I found that Lame is better by far. Any other suggestion? From what I Know even Lame is not the best for this kind of low bitrate. Last edited by nakTT; 17th July 2009 at 18:59.

17th July 2009, 19:20	#4 \| Link
smok3 brontosaurusrex Join Date: Oct 2001 Posts: 2,392	aac he2 probably http://www.hydrogenaudio.org/forums/...hp/t44310.html __________________ certain other member

17th July 2009, 19:40	#5 \| Link
Skelsgard foobaring my ass off Join Date: Nov 2005 Location: Argentina Posts: 618	Have you tried AAC? The SBR/PS that HE-AAC uses are really good for low bitrates. These are some samples using a 16kHz mono 16bit WAV file (resampled from a 44.1kHz stereo 16bit track). http://rapidshare.com/files/256928348/Time_to_Relax.wav http://rapidshare.com/files/256928382/Time_to_Relax.mp3 http://rapidshare.com/files/256928408/Time_to_Relax.mp4 __________________ "Damn, respect my authoritay!!" - E. Cartman

17th July 2009, 20:07	#6 \| Link
nakTT Registered User Join Date: Dec 2008 Posts: 415	I have tried HE-AAC V2 (my focus is more on 8kbps) but it produce a background sound like a grinding sound when the person who speak press a high pitch voice even when I increased the bitrate to 12kbps and then 16kbps. Forgive me for my english. Last edited by nakTT; 17th July 2009 at 20:45.

17th July 2009, 20:36	#7 \| Link
smok3 brontosaurusrex Join Date: Oct 2001 Posts: 2,392	can you provide a short sample ~30s? __________________ certain other member

17th July 2009, 20:44	#8 \| Link
nakTT Registered User Join Date: Dec 2008 Posts: 415	Sure. But I have one problem. Can you suggest one good freeware mp3 cutter that cut the mp3/mp4(AAC) without re-encode.

17th July 2009, 20:57	#9 \| Link
smok3 brontosaurusrex Join Date: Oct 2001 Posts: 2,392	open the mp3 in audacity or similar editor, cut the 30s out and then save as flac (which is lossles), post that flac somewhere (oh, and select the part when the grinding is the most obvious in your tests of course) __________________ certain other member

29th July 2009, 06:20	#10 \| Link
nakTT Registered User Join Date: Dec 2008 Posts: 415	Problem solved with Windows Media Encoder 9 Voice. Thanks to everyone here for your help.