Kristian Kielhofner wrote: > On 7/12/07, Kannaiyan Natesan <[EMAIL PROTECTED]> wrote: >>> I'm really confused about what you are trying to do and what you are >> A compact low powered device which can run fxo/fxs/e1/t1 >> cards along with asterisk. >> >>> Then you say that if you don't need transcoding you would just use >> If you don't need transcoding, then you don't need to do >> any floating point operations. since codec data will be passthrough. >> I'm using wrt for more than a year with g729 & speex codecs without >> any problems. >> >> Kannaiyan >> > > Kanaiyan, > > Clear as mud. I give up!
Kannaiyan, The wrt is fine but using it for transcoding is a non-starter. Transcoding to or from g729 and speex is quite expensive cpu-wise likely to produce interesting artifacts when doing so from anything other than g.711. In particular with speex look ahead delay in the transcoder is at least an additional 30ms but is going to be affected by the pps rate of the sender. I wouldn't really recomend using speex in a situation where you have to transcode to it, and or deliver the results over the pstn. In terms of pstn inter-connection using ulaw will provide the the highest quality. You may get better results with faster hardware or by tunning your speex transcoding (but decreasing your search complexity) but you're never going to eliminate a chunk of the additional latency on transcoding to speex. _______________________________________________ Soekris-tech mailing list [email protected] http://lists.soekris.com/mailman/listinfo/soekris-tech
