home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: comp.compression.research
- Path: sparky!uunet!think.com!zaphod.mps.ohio-state.edu!pacific.mps.ohio-state.edu!linac!att!att!fang!tarpit!bilver!ge-dab!knight.vf.ge.com!happy.vf.ge.com!doug
- From: doug@happy.vf.ge.com (Doug Hughes)
- Subject: Compressing sound on sun
- Message-ID: <1992Aug28.170209.1828@knight.vf.ge.com>
- Followup-To: comp.compression.researc
- Sender: news@knight.vf.ge.com
- Nntp-Posting-Host: happy.vf.ge.com
- Reply-To: doug@happy.vf.ge.com
- Organization: GE Aerospace - VF
- Date: Fri, 28 Aug 1992 17:02:09 GMT
- Lines: 27
-
-
- I'm looking for some good sound compression and silence detection
- algorithms for a sun. So far, I've gotten the adpcm stuff and gotten
- that to work on the sun. It seems okay, and I've been able to cut
- the volume in half using that by translating from Ulaw to signed
- 16 and then doing the 16 -> 4bit quantization. However, I'm afraid
- that all the conversions that are involved are going to slow up
- my throughput as I plan on doing the conversion on the fly for
- packet voice. I guess what I really need is to somehow detect when
- the incoming volume on the audio port is below a certain threshhold
- and then not send packets over the net until it breaks above that
- threshold again. It will probably mean smaller packets, but so be-it.
- I've also gotten the CELP stuff.. But, the documentation only tells
- you how to compile the stuff. It does not say what it should be used for.
- I haven't really heard anything about CELP so I don't know what kind
- of use I can get out of it or if it would be good for voice compression
- on the fly. It says something about an input file also, but it doesn't
- really explain what the input file should be.
- Any help would be appreciated! Thanks!
-
- --
- ___ | GE software developer
- ( / ) _ _, | doug@happy.vf.ge.com
- _/_/ <_>_/_/_<_> | uunet!crdgw1!ge-dab!happy.vf.ge.com!doug
- <_> | 2B | !2B > The_Question
- ________________________|______________________________________________________
-
-