[speex-dev] reommended settings for low bitrate voicecom codec ?

[Allen Drennan]

Hello,

HawkVoice doesn't have a 6.3kbps codec for CELP, it has a 4.5kbps CELP codec
and I do not believe it is being used by TeamSpeak.  The 6.4kbps CELP being
used in TeamSpeak, to which you are referring I believe comes from Lernout &
Hauspie's LHACM.ACM file which it appears you are redistributing (I assume
TeamSpeak has a license and permission to do this).  The only people I
thought had this license was Microsoft for Netmeeting 3.

>From my experience, the Speex codec is much better than the 4.5kbps CELP
codec in HawkVoice, and on par with various L&H CELP codecs.  It is tricky
to implement though, and if you don't do it right - it won't sound correct.

-----Original Message-----
From: owner-speex-dev at xiph.org [mailto:owner-speex-dev at xiph.org] On Behalf
Of Peter Kirk
Sent: Monday, May 12, 2003 3:27 PM
To: speex-dev at xiph.org
Subject: [speex-dev] reommended settings for low bitrate voicecom codec ?

Hello,

the voice-communication TeamSpeak (www.teamspeak.org) is currently testing a

version that supports speex codecs. The quality for high bitrates is quite 
good.
BUT, the low-bandwidth speex codecs that are currently used arent very good.

<p>What I did to find this out:
I comprared a speex AVB with 6.3 KBit/sec (total, overhead for packets and 
stuff included) and the 6.3 Kbit/sec Celp Codec vom hawkvoice (
 http://www.hawksoft.com/hawkvoice) and the result is quite favorable for 
hawkvoice.
I cant believe that this is *normal* speex behavior, please correct me if
that 
hawkvoice thing just performs better on that bandwidth.

Now for my question:

Could you please tell me what options are best for what codec bandwidth ? Im

figuring something is wrong since speex sounds worse than hawkvoice on the 
low bandwidth...I would appreciate if youd post the *recommended* settings 
for 5, 10, 15 and 20 KBit narrowband AVB speex (used in a voicecom that 
shouldnt take too many cpu cylces of the game).

Please excuse my bad english and thanks in advance for helping
Peter
 -- 
Many people are unenthusiastic about their work.

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